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Volumn , Issue , 2006, Pages

Solving tribology problems in rotating machines

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EID: 46349108748     PISSN: None     EISSN: None     Source Type: Book    
DOI: 10.1533/9781845691110     Document Type: Book
Times cited : (13)

References (184)
  • 1
    • 85069351745 scopus 로고
    • 'Applications for Early Detection of Rolling- Element Bearing Failures Using High Frequency Resonance Techniques'
    • 75-DET-46
    • Darlow, M.S. and Badgley, R.H., 'Applications for Early Detection of Rolling- Element Bearing Failures Using High Frequency Resonance Techniques', ASME, 75-DET-46, 1975.
    • (1975) ASME
    • Darlow, M.S.1    Badgley, R.H.2
  • 2
    • 0014895381 scopus 로고
    • 'Signature Analysis Non-Intrusive Techniques for Incipient Failure Identification - Application to Bearings and Gears'
    • National Bureau of Standards, Gaithersburg, MD.
    • Weichbrodt, B. and Smith, K.A., 'Signature Analysis Non-Intrusive Techniques for Incipient Failure Identification - Application to Bearings and Gears', Proc. 5th Space Simulating Conf., 1970, National Bureau of Standards, Gaithersburg, MD.
    • (1970) Proc. 5th Space Simulating Conf.
    • Weichbrodt, B.1    Smith, K.A.2
  • 3
    • 84882678449 scopus 로고
    • 'Resonant Structure Techniques for Bearing Fault Analysis', Proc. 18th Meeting MFPG
    • National Bureau of Standards, Gaithersburg, MD.
    • Burchill, R.F., 'Resonant Structure Techniques for Bearing Fault Analysis', Proc. 18th Meeting MFPG, 1964, National Bureau of Standards, Gaithersburg, MD.
    • (1964)
    • Burchill, R.F.1
  • 4
    • 85025183602 scopus 로고
    • 'Early Detection of Defects in Roller Element Bearings'
    • SAE Paper 750209
    • Darlow, M.S. and Badgley, R.H., 'Early Detection of Defects in Roller Element Bearings', SAE Paper 750209, 1975.
    • (1975)
    • Darlow, M.S.1    Badgley, R.H.2
  • 5
    • 84882657252 scopus 로고    scopus 로고
    • 'Mechanical Signature Analysis of Ball Bearings', Application Note 3
    • December 1972, Federal Scientific.
    • Babkin, A.S. and Anderson, J.J., 'Mechanical Signature Analysis of Ball Bearings', Application Note 3, December 1972, Federal Scientific.
    • Babkin, A.S.1    Anderson, J.J.2
  • 6
    • 84969114219 scopus 로고    scopus 로고
    • 'Frequency calculations for Ball Bearings'
    • April, 1978, Nicolet Scientific Corp.
    • Sramek, B., 'Frequency calculations for Ball Bearings', Preliminary note, April, 1978, Nicolet Scientific Corp.
    • Preliminary note
    • Sramek, B.1
  • 7
    • 3342972603 scopus 로고    scopus 로고
    • 'Detection of Ball Bearing Malfunctions'
    • Dec. 1970.
    • Martin, R.L., 'Detection of Ball Bearing Malfunctions', J. Instrum. Control Systems, 79-82, Dec. 1970.
    • J. Instrum. Control Systems , pp. 79-82
    • Martin, R.L.1
  • 8
    • 84882713784 scopus 로고
    • 'Reliability Analysis of Anti-friction Bearings by High Frequency Resonance Technique'
    • Prashad, H., et al., 'Reliability Analysis of Anti-friction Bearings by High Frequency Resonance Technique', BHEL J., 1985, 6(1), 1-15.
    • (1985) BHEL J. , vol.6 , Issue.1
    • Prashad, H.1
  • 9
    • 0022138060 scopus 로고    scopus 로고
    • 'Diagnostic Monitoring of Rolling-Element Bearings by High Frequency Resonance Technique'
    • 1985
    • Prashad, H., Ghosh, M. and Biswas, S., 'Diagnostic Monitoring of Rolling-Element Bearings by High Frequency Resonance Technique', ASLE Trans., 1985, 28(4), 439-448
    • ASLE Trans. , vol.28 , Issue.4 , pp. 439-448
    • Prashad, H.1    Ghosh, M.2    Biswas, S.3
  • 10
    • 0022138134 scopus 로고
    • 'Functional and Acceptance Testing in Rolling Bearing Development'
    • Markert, F.J. and Schweinfurt, S.K.F., 'Functional and Acceptance Testing in Rolling Bearing Development', Ball Bearing J., 224, 28-32, 1985.
    • (1985) Ball Bearing J. , vol.224 , pp. 28-32
    • Markert, F.J.1    Schweinfurt, S.K.F.2
  • 11
    • 84882682633 scopus 로고
    • 'Performance Evaluation of Rolling Element Bearings'
    • IISc, Bangalore (India)
    • Prashad, H., 'Performance Evaluation of Rolling Element Bearings', National Conference of Mach. Mech., IISc, Bangalore (India), 1985.
    • (1985) National Conference of Mach. Mech.
    • Prashad, H.1
  • 12
    • 84882645840 scopus 로고    scopus 로고
    • 'Forecasting the Operating Temperature of Bearings'
    • D K 621-822, 6536:721, Machine-31 (Din), 2/77
    • Witte, D.C., 'Forecasting the Operating Temperature of Bearings', D K 621-822, 6536:721, Machine-31 (Din), 2/77, pp. 80-83.
    • Witte, D.C.1
  • 13
    • 0021561907 scopus 로고
    • 'Selection of Test Acceleration Coefficients for Bearing Units of Electrical Machines'
    • Goldberg, D.D. et al., 'Selection of Test Acceleration Coefficients for Bearing Units of Electrical Machines', Electrotekhnika, 55, 10, 34-36, 1984.
    • (1984) Electrotekhnika , vol.55 , Issue.10 , pp. 34-36
    • Goldberg, D.D.1
  • 15
    • 0021458652 scopus 로고    scopus 로고
    • 'The Condition Monitoring of Rolling Element Bearings using Vibration Analysis'
    • Acoust., Stress, Reliab. Des, July 1984.
    • Mathew, J. and Alfredson, R.J., 'The Condition Monitoring of Rolling Element Bearings using Vibration Analysis', ASME J. Vibr., Acoust., Stress, Reliab. Des., 106, 447-453, July 1984.
    • ASME J. Vibr. , vol.106 , pp. 447-453
    • Mathew, J.1    Alfredson, R.J.2
  • 16
    • 0343475570 scopus 로고
    • 'Condition Monitoring of Anti-friction Bearing'
    • Prashad, H., 'Condition Monitoring of Anti-friction Bearing', J. Inst. Eng. (I), 69, 65-74, 1989.
    • (1989) J. Inst. Eng. (I) , vol.69 , pp. 65-74
    • Prashad, H.1
  • 17
    • 0022138060 scopus 로고    scopus 로고
    • 'Diagnostic Monitoring of Rolling Element Bearings by High Frequency Resonance Technique'
    • Prashad, H., et al., 'Diagnostic Monitoring of Rolling Element Bearings by High Frequency Resonance Technique', ASLE Trans., 28(4) 439-448, 1985.
    • (1985) ASLE Trans. , vol.28 , Issue.4 , pp. 439-448
    • Prashad, H.1
  • 18
    • 0022954678 scopus 로고
    • 'The Effect of Cage and Roller Slip on the Measured Defect Frequency Response of Rolling Element Bearings'
    • Prashad, H., 'The Effect of Cage and Roller Slip on the Measured Defect Frequency Response of Rolling Element Bearings', ASLE Trans., 30(3), 360-367, 1986.
    • (1986) ASLE Trans. , vol.30 , Issue.3 , pp. 360-367
    • Prashad, H.1
  • 19
    • 84882650842 scopus 로고
    • 'The Shock Pulse Method for Monitoring the Condition of Anti Friction Bearings'
    • Betthel, K., 'The Shock Pulse Method for Monitoring the Condition of Anti Friction Bearings', SPM Catalogue, 1977.
    • (1977) SPM Catalogue
    • Betthel, K.1
  • 20
    • 84882585492 scopus 로고
    • Kurtosis Technical Handbook, Condition Monitoring Ltd
    • Kurtosis Technical Handbook, Condition Monitoring Ltd, 1982.
    • (1982)
  • 21
    • 84882615825 scopus 로고
    • Ball Roller Bearing Eng. FAG, EA 10-12
    • Ball Roller Bearing Eng., Indus. Eng. J., FAG, EA 10-12, 1983.
    • (1983) Indus. Eng. J.
  • 22
    • 0029108618 scopus 로고
    • 'Functional Performance of Roller Bearings for Acceptance in Routine Applications'
    • India, Part MC, Div., Mech. Eng
    • Prashad, H., 'Functional Performance of Roller Bearings for Acceptance in Routine Applications', J. Inst. Eng. India, Part MC, Div., Mech. Eng. 70, 105-113, 1995.
    • (1995) J. Inst. Eng. , vol.70 , pp. 105-113
    • Prashad, H.1
  • 23
    • 79953030603 scopus 로고
    • 'Cage and Roller-Slip in High Speed Roller bearings'
    • Boness, R.J., 'Cage and Roller-Slip in High Speed Roller bearings', J. Mech. Sci., 2(2), 1969.
    • (1969) J. Mech. Sci. , vol.2 , Issue.2
    • Boness, R.J.1
  • 24
    • 0002866114 scopus 로고
    • 'Some Aspects of the Performance of High Speed Lightly Loaded Cylindrical Roller Bearings'
    • Smith, C.F., 'Some Aspects of the Performance of High Speed Lightly Loaded Cylindrical Roller Bearings', Proc. Inst. Mech. Eng., 176(227), 566, 1962.
    • (1962) Proc. Inst. Mech. Eng. , vol.176 , Issue.227 , pp. 566
    • Smith, C.F.1
  • 25
    • 0001808119 scopus 로고
    • 'Theory of Roller Bearing Lubrication and Deformation'
    • (Inst. Mech. Eng.), London
    • Dowson, D. and Higginson, G.R., 'Theory of Roller Bearing Lubrication and Deformation', Proc. Lubr. Wear Covn. (Inst. Mech. Eng.), London, 216, 1963.
    • (1963) Proc. Lubr. Wear Covn. , vol.216
    • Dowson, D.1    Higginson, G.R.2
  • 26
    • 84958342202 scopus 로고
    • 'An Analytical Method to Predict Skidding in High-speed Roller Bearings'
    • Harris, T.A., 'An Analytical Method to Predict Skidding in High-speed Roller Bearings', ASLE Trans., 9(3), 229-241, 1966.
    • (1966) ASLE Trans. , vol.9 , Issue.3 , pp. 229-241
    • Harris, T.A.1
  • 27
    • 0022138060 scopus 로고    scopus 로고
    • 'Diagnostic Monitoring of Rolling-element Bearings by High Frequency Resonance Technique'
    • Prashad, H., Ghosh, M. and Biswas, S., 'Diagnostic Monitoring of Rolling-element Bearings by High Frequency Resonance Technique', ASLE Trans., 28(4) 439-448, 1985.
    • (1985) ASLE Trans. , vol.28 , Issue.4 , pp. 439-448
    • Prashad, H.1    Ghosh, M.2    Biswas, S.3
  • 29
    • 84882617002 scopus 로고
    • 'An Investigation of Early Detection of Defects in Ball Bearings by Vibration Monitoring'
    • Nishio, K. et al., 'An Investigation of Early Detection of Defects in Ball Bearings by Vibration Monitoring', ASME Paper 79-DET-45, 1979.
    • (1979) ASME Paper 79-DET-45
    • Nishio, K.1
  • 30
    • 84882725425 scopus 로고
    • 'Vibration Monitoring of Rolling-element Bearings by High-Frequency Resonance Technique - A Review'
    • McFadden, P.D. and Smith, J.D., 'Vibration Monitoring of Rolling-element Bearings by High-Frequency Resonance Technique - A Review', Tribol. Int., 17(1), 84, 1986.
    • (1986) Tribol. Int. , vol.17 , Issue.1 , pp. 84
    • McFadden, P.D.1    Smith, J.D.2
  • 31
    • 84912461032 scopus 로고    scopus 로고
    • 'Application of Signal Processing Techniques to Machinery Health Monitoring, Application of Time Series Analysis'
    • University of Southampton, 16.1-16.23, April 1980.
    • Steward, R.M., 'Application of Signal Processing Techniques to Machinery Health Monitoring, Application of Time Series Analysis', paper available from Inst. of Sound and Vibration Research, University of Southampton, 16.1-16.23, April 1980.
    • paper available from Inst. of Sound and Vibration Research
    • Steward, R.M.1
  • 32
    • 0022237098 scopus 로고    scopus 로고
    • 'Cage Slip and its Effect on Damages in High Speed Roller Bearing'
    • Tokyo, Japan, 8-10, July 1985.
    • Kaido, H. and Doi, Y., 'Cage Slip and its Effect on Damages in High Speed Roller Bearing', Proc. JSLE Intl. Tribol. Conf., Tokyo, Japan, pp. 591-596, 8-10, July 1985.
    • Proc. JSLE Intl. Tribol. Conf. , pp. 591-596
    • Kaido, H.1    Doi, Y.2
  • 33
    • 0023378688 scopus 로고    scopus 로고
    • 'The Effect of Cage and Roller Slip on the Measured Defect Frequency Response of Rolling-element Bearings'
    • Prashad, H., 'The Effect of Cage and Roller Slip on the Measured Defect Frequency Response of Rolling-element Bearings', ASLE Trans., 30(3), 360-366, 1987.
    • (1987) ASLE Trans. , vol.30 , Issue.3 , pp. 360-366
    • Prashad, H.1
  • 34
    • 0028486351 scopus 로고
    • Investigations of Damaged Rolling-element Bearings and Deterioration of Lubricants under the Influence of Electric Current
    • Prashad, H., 'Investigations of Damaged Rolling-element Bearings and Deterioration of Lubricants under the Influence of Electric Current', Wear, 176, 151-161, 1994.
    • (1994) Wear , vol.176 , pp. 151-161
    • Prashad, H.1
  • 35
    • 0004054303 scopus 로고
    • 'Prediction of Bearing Wear due to Shaft Voltage in Electrical Machines'
    • Bradford, M., 'Prediction of Bearing Wear due to Shaft Voltage in Electrical Machines', ERA Technology Limited, 1984.
    • (1984) ERA Technology Limited
    • Bradford, M.1
  • 36
    • 0023768002 scopus 로고
    • Investigations on Corrugated Pattern on the Surface of Roller Bearings Operated under the Influence of Electrical Fields
    • Prashad, H., 'Investigations on Corrugated Pattern on the Surface of Roller Bearings Operated under the Influence of Electrical Fields', Lub. Eng., 44, 8, 710-718, 1988.
    • (1988) Lub. Eng. , vol.44 , Issue.8 , pp. 710-718
    • Prashad, H.1
  • 37
    • 0023105740 scopus 로고
    • Effects of Operating Parameters on the Threshold Voltages and Impedance Response of Non-insulated Rolling-element Bearings under the Action of Electric Current
    • Prashad, H., 'Effects of Operating Parameters on the Threshold Voltages and Impedance Response of Non-insulated Rolling-element Bearings under the Action of Electric Current', Wear, 117, 223-240, 1987.
    • (1987) Wear , vol.117 , pp. 223-240
    • Prashad, H.1
  • 38
    • 0030111522 scopus 로고    scopus 로고
    • Magnetic Flux Density Distribution on the Track Surface of Rollingelement Bearings - An Experimental and Theoretical Investigation
    • Prashad, H., 'Magnetic Flux Density Distribution on the Track Surface of Rollingelement Bearings - An Experimental and Theoretical Investigation', Tribol. Trans., 39, 2, 386-391, 1996.
    • (1996) Tribol. Trans. , vol.39 , Issue.2 , pp. 386-391
    • Prashad, H.1
  • 40
    • 0002485856 scopus 로고
    • Effects of an Electric Current on Contact Temperature, Contact Stresses and Slip band initiation on Roller Track of Roller Bearings
    • Andreason, S., 'Effects of an Electric Current on Contact Temperature, Contact Stresses and Slip band initiation on Roller Track of Roller Bearings,' Ball Bearing J., 153, 6-12, 1968.
    • (1968) Ball Bearing J. , vol.153 , pp. 6-12
    • Andreason, S.1
  • 41
    • 0002507195 scopus 로고
    • 'Effects of Electric Currents on the Life of Rolling contact Bearings'
    • Bournemouth, 1963, Institution of Mechanical Engineers, London
    • Simpson, F.E. and Crump J.J., 'Effects of Electric Currents on the Life of Rolling contact Bearings', Proc. Lubrication and Wear Convention, Bournemouth, 1963, Institution of Mechanical Engineers, London, 1963, Paper 27, 296-304.
    • (1963) Proc. Lubrication and Wear Convention , vol.27 , pp. 296-304
    • Simpson, F.E.1    Crump, J.J.2
  • 42
    • 0024662137 scopus 로고
    • Analysis of the Effects of Electric Current on Contact Temperature Contact Stresses and Slip Band Initiation on the Roller Tracks of Roller Bearings
    • Prashad, H., 'Analysis of the Effects of Electric Current on Contact Temperature Contact Stresses and Slip Band Initiation on the Roller Tracks of Roller Bearings', Wear, 131, 1-14, 1989.
    • (1989) Wear , vol.131 , pp. 1-14
    • Prashad, H.1
  • 43
    • 0024641574 scopus 로고
    • 'Diagnosis of Deterioration of Lithium Greases used in Rollingelement Bearings by X-ray Diffractometry'
    • Prashad, H., 'Diagnosis of Deterioration of Lithium Greases used in Rollingelement Bearings by X-ray Diffractometry', Tribol. Trans., 32 (2) 205-214, 1989.
    • (1989) Tribol. Trans. , vol.32 , Issue.2 , pp. 205-214
    • Prashad, H.1
  • 44
    • 0023111675 scopus 로고
    • Bearing Damage by Electrical Wear and its Effects on Deterioration of Lubricating Grease
    • Komatsuzaki, S., 'Bearing Damage by Electrical Wear and its Effects on Deterioration of Lubricating Grease', Lub. Eng., 43, 25-30, 1987.
    • (1987) Lub. Eng. , vol.43 , pp. 25-30
    • Komatsuzaki, S.1
  • 45
    • 0029831235 scopus 로고    scopus 로고
    • Rheological and Physical Studies of Lubricating Greases Before and After Use in Bearings
    • Remy, M. and Magnin, A., 'Rheological and Physical Studies of Lubricating Greases Before and After Use in Bearings', Trans. ASME, J. Tribol., 118, 681-686, 1996.
    • (1996) Trans. ASME, J. Tribol. , vol.118 , pp. 681-686
    • Remy, M.1    Magnin, A.2
  • 46
    • 0002557248 scopus 로고
    • 'Valuable Results from Bearing Damage Analysis'
    • April
    • Winder L.R. and Wolfe, O.J., 'Valuable Results from Bearing Damage Analysis', Met. Prog., April, pp. 52-59, 1966.
    • (1966) Met. Prog. , pp. 52-59
    • Winder, L.R.1    Wolfe, O.J.2
  • 47
    • 0030268005 scopus 로고    scopus 로고
    • 'Diagnosis of Failure of Rolling-element Bearings of Alternators - A Study'
    • Prashad, H., 'Diagnosis of Failure of Rolling-element Bearings of Alternators - A Study', Wear, 198(1-2), 49-51, 1996.
    • (1996) Wear , vol.198 , Issue.1-2 , pp. 49-51
    • Prashad, H.1
  • 48
    • 0024050984 scopus 로고
    • The Effect of Current Leakage on Electro-adhesion Forces in Rolling - Friction and Magnetic Flux Density Distribution on the Surface of Rolling- Element Bearing
    • Prashad, H., 'The Effect of Current Leakage on Electro-adhesion Forces in Rolling - Friction and Magnetic Flux Density Distribution on the Surface of Rolling- Element Bearing', Trans. ASME, J. Tribol., 110, 448-455, 1988.
    • (1988) Trans. ASME, J. Tribol. , vol.110 , pp. 448-455
    • Prashad, H.1
  • 49
    • 0022138060 scopus 로고    scopus 로고
    • Diagnostic Monitoring of Rolling-element Bearing by High-frequency Resource Technique
    • Prashad, H., Ghosh, M. and Biswas S., 'Diagnostic Monitoring of Rolling-element Bearing by High-frequency Resource Technique', ASLE Trans., 28(4) 39-448, 1985.
    • (1985) ASLE Trans. , vol.28 , Issue.4 , pp. 39-448
    • Prashad, H.1    Ghosh, M.2    Biswas, S.3
  • 50
    • 41449106153 scopus 로고    scopus 로고
    • Investigations and Diagnosis of Failure of Rolling-element Bearings Due to Unforeseen Causes - A Case Study
    • Prashad, H., 'Investigations and Diagnosis of Failure of Rolling-element Bearings Due to Unforeseen Causes - A Case Study', BHEL J., 20(1), 59-67, 1999.
    • (1999) BHEL J. , vol.20 , Issue.1 , pp. 59-67
    • Prashad, H.1
  • 51
    • 0032865451 scopus 로고    scopus 로고
    • 'Diagnosis and Cause Analysis of Rolling-element Bearings Failure in Electric Power Equipments Due to Current Passage'
    • Prashad, H., 'Diagnosis and Cause Analysis of Rolling-element Bearings Failure in Electric Power Equipments Due to Current Passage', Lub. Eng., 5, 30-35, 1999
    • (1999) Lub. Eng. , vol.5 , pp. 30-35
    • Prashad, H.1
  • 52
    • 0028486351 scopus 로고
    • Investigations of Damaged Rolling-element Bearings and Deterioration of Lubricants under the Influence of Electric Current
    • Prashad, H., 'Investigations of Damaged Rolling-element Bearings and Deterioration of Lubricants under the Influence of Electric Current,' Wear, 176, 151-161, 1994.
    • (1994) Wear , vol.176 , pp. 151-161
    • Prashad, H.1
  • 53
    • 0004054303 scopus 로고
    • 'Prediction of Bearing Wear due to shaft Voltage in Electrical Machines', Technical Report No. 84-007
    • England
    • Bradford, M., 'Prediction of Bearing Wear due to shaft Voltage in Electrical Machines', Technical Report No. 84-007, ERA Technology Limited, England, pp. 49-53, 1984.
    • (1984) ERA Technology Limited , pp. 49-53
    • Bradford, M.1
  • 54
    • 0023768002 scopus 로고
    • Investigations on Corrugated Pattern on the Surface of Roller Bearings Operated Under the Influence of Electrical Fields
    • Prashad, H., 'Investigations on Corrugated Pattern on the Surface of Roller Bearings Operated Under the Influence of Electrical Fields', Lubr. Eng., 44(8), 710-718, 1988.
    • (1988) Lubr. Eng. , vol.44 , Issue.8 , pp. 710-718
    • Prashad, H.1
  • 55
    • 0023105740 scopus 로고
    • Effects of Operating Parameters on the Threshold Voltages and Impedance Response of Non-insulated Rolling-element Bearings under the Action of Electric Current
    • Prashad, H., 'Effects of Operating Parameters on the Threshold Voltages and Impedance Response of Non-insulated Rolling-element Bearings under the Action of Electric Current', Wear, 117, 223-240, 1987.
    • (1987) Wear , vol.117 , pp. 223-240
    • Prashad, H.1
  • 57
    • 0033309332 scopus 로고    scopus 로고
    • Determination of Magnetic Flux Density on the Surfaces of Rollingelement Bearings as an Indication of the Current that has Passed Through Them - An Investigation
    • Prashad, H., 'Determination of Magnetic Flux Density on the Surfaces of Rollingelement Bearings as an Indication of the Current that has Passed Through Them - An Investigation', Tribol. Int., 32, 455-467, 1999.
    • (1999) Tribol. Int. , vol.32 , pp. 455-467
    • Prashad, H.1
  • 58
    • 0001775358 scopus 로고    scopus 로고
    • 'A Survey of Rolling Bearing Failures'
    • Part F 184, 1969-70
    • Morgan, A.W. and Wyllie, D., 'A Survey of Rolling Bearing Failures', Proc. Inst. Mech. Eng., Part F 184, 48-56, 1969-70.
    • Proc. Inst. Mech. Eng. , pp. 48-56
    • Morgan, A.W.1    Wyllie, D.2
  • 59
    • 0002485856 scopus 로고
    • Passage of Electric Current through Rolling Bearings
    • Andreason, S., 'Passage of Electric Current through Rolling Bearings', Ball Bearing J. 153, 6-12, 1968.
    • (1968) Ball Bearing J. , vol.153 , pp. 6-12
    • Andreason, S.1
  • 60
    • 0002507195 scopus 로고
    • 'Effects of Electric Currents on the Life of Rolling Contact Bearings'
    • Bournemouth, Inst. Mech. Eng., London, Paper 27
    • Simpson, F.E. and Crump, W.J.J., 'Effects of Electric Currents on the Life of Rolling Contact Bearings', Proc. Lubrication and Wear Convention, Bournemouth, Inst. Mech. Eng., London, Paper 27, pp. 296-304, 1963.
    • (1963) Proc. Lubrication and Wear Convention , pp. 296-304
    • Simpson, F.E.1    Crump, W.J.J.2
  • 61
    • 0024662137 scopus 로고
    • Analysis of the Effects of Electric Current on Contact Temperature Contact Stresses and Slip Band Initiation on the Roller Tracks of Roller Bearings
    • Prashad, H., 'Analysis of the Effects of Electric Current on Contact Temperature Contact Stresses and Slip Band Initiation on the Roller Tracks of Roller Bearings', Wear, 131, 1-14, 1989.
    • (1989) Wear , vol.131 , pp. 1-14
    • Prashad, H.1
  • 62
    • 0023111675 scopus 로고
    • Bearing Damage by Electrical Wear and its Effects on Deterioration of Lubricating Grease
    • Komatsuzaki, S., 'Bearing Damage by Electrical Wear and its Effects on Deterioration of Lubricating Grease', Lubr. Eng., 43(1), 25-30, 1987.
    • (1987) Lubr. Eng. , vol.43 , Issue.1 , pp. 25-30
    • Komatsuzaki, S.1
  • 63
    • 0024641574 scopus 로고
    • Diagnosis of Deterioration of Lithium Greases used in Rollingelement Bearings by X-ray Diffractometry
    • Prashad, H., 'Diagnosis of Deterioration of Lithium Greases used in Rollingelement Bearings by X-ray Diffractometry', Tribol. Trans., 32 (2), 205-214, 1989.
    • (1989) Tribol. Trans. , vol.32 , Issue.2 , pp. 205-214
    • Prashad, H.1
  • 64
    • 0029831235 scopus 로고    scopus 로고
    • Rheological and Physical Studies of Lubricating Greases Before and After Use in Bearings
    • Remy, M. and Magnin, A., 'Rheological and Physical Studies of Lubricating Greases Before and After Use in Bearings', Trans. ASME, J. Tribol., 118, 681-686, 1996.
    • (1996) Trans. ASME, J. Tribol. , vol.118 , pp. 681-686
    • Remy, M.1    Magnin, A.2
  • 65
    • 0035307114 scopus 로고    scopus 로고
    • Pitting Mechanism on Lubricated Surface of Babbit Alloy/Bearing Steel Pair under AC Electric Field
    • Lin, C.M., Chiou, Y.C. and Lee, R.T., 'Pitting Mechanism on Lubricated Surface of Babbit Alloy/Bearing Steel Pair under AC Electric Field', Wear, 249, 133-142, 2001.
    • (2001) Wear , vol.249 , pp. 133-142
    • Lin, C.M.1    Chiou, Y.C.2    Lee, R.T.3
  • 66
    • 0033237669 scopus 로고    scopus 로고
    • Formation Criterion and Mechanism of Electrical Pitting on the Lubricated Surface under AC Electrical Field
    • Chiou, Y.C., Lee, R.T. and Lin, C.M., 'Formation Criterion and Mechanism of Electrical Pitting on the Lubricated Surface under AC Electrical Field', Wear, 236, 62-72, 1999.
    • (1999) Wear , vol.236 , pp. 62-72
    • Chiou, Y.C.1    Lee, R.T.2    Lin, C.M.3
  • 67
    • 0002557248 scopus 로고
    • Valuable Results from Bearing Damage Analysis
    • Winder, L.R. and Wolfe, O.J., 'Valuable Results from Bearing Damage Analysis', Metal Progress, 4, 52-59, 1968.
    • (1968) Metal Progress , vol.4 , pp. 52-59
    • Winder, L.R.1    Wolfe, O.J.2
  • 68
    • 0030268005 scopus 로고    scopus 로고
    • Diagnosis of Failure of Rolling-element Bearings of Alternators - A Study
    • Prashad, H., 'Diagnosis of Failure of Rolling-element Bearings of Alternators - A Study', Wear, 198, 46-51, 1996.
    • (1996) Wear , vol.198 , pp. 46-51
    • Prashad, H.1
  • 69
    • 41449096239 scopus 로고    scopus 로고
    • The Effect of Current Leakage on Electro-adhesion Forces in Rolling - Friction and Magnetic Flux Density Distribution on the Surface of Rollingelement Bearing
    • Prashad, H., 'The Effect of Current Leakage on Electro-adhesion Forces in Rolling - Friction and Magnetic Flux Density Distribution on the Surface of Rollingelement Bearing', Trans. ASME, J. Tribol., 110, 448-455, 1998.
    • (1998) Trans. ASME, J. Tribol. , vol.110 , pp. 448-455
    • Prashad, H.1
  • 70
    • 0022138060 scopus 로고    scopus 로고
    • Diagnostic Monitoring of Rolling-element Bearing by High-frequency Resource Technique
    • Prashad, H., Ghosh, M. and Biswas, S., 'Diagnostic Monitoring of Rolling-element Bearing by High-frequency Resource Technique', ASLE Trans., 28(4), 439-448, 1985.
    • (1985) ASLE Trans. , vol.28 , Issue.4 , pp. 439-448
    • Prashad, H.1    Ghosh, M.2    Biswas, S.3
  • 71
    • 18144441109 scopus 로고    scopus 로고
    • Diagnosis and Cause Analysis of Rolling-element Bearing Failure in Electrical Power Equipment Due to Current Leakage
    • Prashad, H., 'Diagnosis and Cause Analysis of Rolling-element Bearing Failure in Electrical Power Equipment Due to Current Leakage', Lubr. Eng., 55(5), 30-35, 1999.
    • (1999) Lubr. Eng. , vol.55 , Issue.5 , pp. 30-35
    • Prashad, H.1
  • 72
    • 0023378688 scopus 로고    scopus 로고
    • The Effect of Cage and Roller Slip on the Measured Defect Frequency Reference of Rolling-element Bearings
    • Prashad, H., 'The Effect of Cage and Roller Slip on the Measured Defect Frequency Reference of Rolling-element Bearings', ASLE Trans, 30(3), 360-66, 1987.
    • (1987) ASLE Trans , vol.30 , Issue.3 , pp. 360-66
    • Prashad, H.1
  • 73
    • 0005816728 scopus 로고
    • Electricity and Magnetism, 7th ed.
    • Longmans, Green and Co., New York
    • Starling, S.G., Electricity and Magnetism, 7th ed., Longmans, Green and Co., New York, 1960.
    • (1960)
    • Starling, S.G.1
  • 74
    • 0031947281 scopus 로고    scopus 로고
    • Determination of Time Span for Appearance of Flutes on Track Surface of Rolling-element Bearings Under the Influence of Electrical Current
    • Prashad, H., 'Determination of Time Span for Appearance of Flutes on Track Surface of Rolling-element Bearings Under the Influence of Electrical Current', Tribol. Trans, 41(1), 103-109, 1998.
    • (1998) Tribol. Trans , vol.41 , Issue.1 , pp. 103-109
    • Prashad, H.1
  • 75
    • 0023770282 scopus 로고
    • 'Behavior of Greases in Statically Bounded Conditions and When Used in Non-insulated Anti-friction Bearings Under the Influence of Electrical Fields'
    • Prashad, H. and Murthy, T.S.R., 'Behavior of Greases in Statically Bounded Conditions and When Used in Non-insulated Anti-friction Bearings Under the Influence of Electrical Fields', Lubr. Eng., 44(3), pp. 239-246, 1988.
    • (1988) Lubr. Eng. , vol.44 , Issue.3 , pp. 239-246
    • Prashad, H.1    Murthy, T.S.R.2
  • 76
    • 0025156425 scopus 로고
    • Theoretical Analysis of the Effects of Instantaneous Charge Leakage on Roller Track of Roller Bearings Lubricated with High Resistivity Lubricants
    • Prashad, H., 'Theoretical Analysis of the Effects of Instantaneous Charge Leakage on Roller Track of Roller Bearings Lubricated with High Resistivity Lubricants', Trans. ASME J. Tribol., 112, 37-43, 1990.
    • (1990) Trans. ASME J. Tribol. , vol.112 , pp. 37-43
    • Prashad, H.1
  • 77
    • 0036629091 scopus 로고    scopus 로고
    • Diagnosis of Rolling-element Bearings Failure by Localized Current Between Track Surfaces of Races and Rolling-Elements
    • Prashad, H., 'Diagnosis of Rolling-element Bearings Failure by Localized Current Between Track Surfaces of Races and Rolling-Elements', Trans. ASME J. Tribol., 124, 468-473, 2002.
    • (2002) Trans. ASME J. Tribol. , vol.124 , pp. 468-473
    • Prashad, H.1
  • 78
    • 0023770282 scopus 로고
    • Behaviour of Greases in Statically Bounded Conditions and When Used in Non-insulated Anti-friction Bearings Under the Influence of Electrical Fields
    • Prashad, H. and Murthy, T.S.R., 'Behaviour of Greases in Statically Bounded Conditions and When Used in Non-insulated Anti-friction Bearings Under the Influence of Electrical Fields', Lubr. Eng., 44(3), 239-246, 1988.
    • (1988) Lubr. Eng. , vol.44 , Issue.3 , pp. 239-246
    • Prashad, H.1    Murthy, T.S.R.2
  • 79
    • 0002658577 scopus 로고    scopus 로고
    • Experimental Study on Influence of Electrical Fields on Behaviour of Grease in Statically Bounded Conditions and When Used in Non-insulated Bearings
    • Prashad, H., 'Experimental Study on Influence of Electrical Fields on Behaviour of Grease in Statically Bounded Conditions and When Used in Non-insulated Bearings', BHEL J., 7(3), 18-34, 1996.
    • (1996) BHEL J. , vol.7 , Issue.3 , pp. 18-34
    • Prashad, H.1
  • 80
    • 0018960990 scopus 로고
    • 'Elasto-hydrodynamic Films of Lithium Greases'
    • (also published in NLGI Spokesman, March 1981)
    • Polacios, J.M., 'Elasto-hydrodynamic Films of Lithium Greases', Macanique, Materiaux, Electricite (GAMI), 176, 365-366, 1980 (also published in NLGI Spokesman, March 1981).
    • (1980) Macanique, Materiaux, Electricite (GAMI) , vol.176 , pp. 365-366
    • Polacios, J.M.1
  • 81
    • 84882642370 scopus 로고
    • 'Electrophysical and Electrochemical Phenomena in Friction
    • Pastnikov, S.N., 'Electrophysical and Electrochemical Phenomena in Friction, Cutting and Lubrication', VNR, 1978.
    • (1978) Cutting and Lubrication', VNR
    • Pastnikov, S.N.1
  • 82
    • 0032205190 scopus 로고    scopus 로고
    • 'Variation and Recovery of Resistivity of Greases - An Experimental Investigation'
    • 73-103, November 1998
    • Prashad, H., 'Variation and Recovery of Resistivity of Greases - An Experimental Investigation', J. Lubr. Sci. (France), 11-1, 73-103, November 1998.
    • J. Lubr. Sci. (France) , pp. 11-1
    • Prashad, H.1
  • 83
    • 0024641574 scopus 로고
    • Diagnosis of Lithium Greases Used in Rolling-element Bearings by X-Ray Diffractometry
    • Prashad, H., 'Diagnosis of Lithium Greases Used in Rolling-element Bearings by X-Ray Diffractometry', STLE Trans, 32(2), 205-214, 1989.
    • (1989) STLE Trans , vol.32 , Issue.2 , pp. 205-214
    • Prashad, H.1
  • 84
    • 0032138798 scopus 로고    scopus 로고
    • 'Deterioration of Lithium Greases Under the Influence of Electrical Current - An Investigation'
    • 323-342, August 1998
    • Prashad, H. and Murthy, T.S.R., 'Deterioration of Lithium Greases Under the Influence of Electrical Current - An Investigation', J. Lubr. Sci. (France), 10-4, 323-342, August 1998.
    • J. Lubr. Sci. (France) , pp. 10-4
    • Prashad, H.1    Murthy, T.S.R.2
  • 85
    • 0028486351 scopus 로고
    • Investigations of Damaged Rolling-element Bearings and Deterioration Response and performance of a rolling-element bearing 103 of Lubricants Under the Influence of Electrical Fields
    • Prashad, H., 'Investigations of Damaged Rolling-element Bearings and Deterioration Response and performance of a rolling-element bearing 103 of Lubricants Under the Influence of Electrical Fields', Wear, 176, 151-161, 1994.
    • (1994) Wear , vol.176 , pp. 151-161
    • Prashad, H.1
  • 86
    • 0023768002 scopus 로고
    • 'Investigations of Corrugated Pattern on the Surfaces of Roller Bearings Operated Under the Influence of Electrical Fields'
    • San Antonio Marriott (5-8, Oct 1987), also published in Lubr. Eng.
    • Prashad, H., 'Investigations of Corrugated Pattern on the Surfaces of Roller Bearings Operated Under the Influence of Electrical Fields', ASME/ASLE Tribology Conference, San Antonio Marriott (5-8, Oct. 1987), also published in Lubr. Eng., 44, 710-718. 1988.
    • (1988) ASME/ASLE Tribology Conference , vol.44 , pp. 710-718
    • Prashad, H.1
  • 87
    • 0023378688 scopus 로고    scopus 로고
    • 'The Effect of Cage and Roller Slip on the Measured Defect Frequency Response of Rolling-element Bearings'
    • July 1987
    • Prashad, H., 'The Effect of Cage and Roller Slip on the Measured Defect Frequency Response of Rolling-element Bearings', ASLE Trans, 30(3), 360-367, July 1987.
    • ASLE Trans , vol.30 , Issue.3 , pp. 360-367
    • Prashad, H.1
  • 88
    • 0024050984 scopus 로고
    • The Effects of Current Leakage on Electroadhesion Forces in Rolling Friction and Magnetic Flux Density Distribution on the Surface of Rolling-element Bearings
    • Prashad, H., 'The Effects of Current Leakage on Electroadhesion Forces in Rolling Friction and Magnetic Flux Density Distribution on the Surface of Rolling-element Bearings', Trans. ASME, J. Tribol., 110, 448-455, 1988.
    • (1988) Trans. ASME, J. Tribol. , vol.110 , pp. 448-455
    • Prashad, H.1
  • 89
    • 0022184150 scopus 로고    scopus 로고
    • 'Effects of Magnetic Flux on Rolling-element/Bearings'
    • IEE Conference, 17-19, Sept. 1985, Publication 254
    • Tasker, J.L. and Graham, R.S., 'Effects of Magnetic Flux on Rolling-element/Bearings', IEE Conference, 17-19, Sept. 1985, Publication 254, pp. 152-156.
    • Tasker, J.L.1    Graham, R.S.2
  • 90
    • 0030111522 scopus 로고    scopus 로고
    • Magnetic Flux Density Distribution on the Track Surface of Rollingelement Bearings - An Experimental and Theoretical Investigation
    • Prashad, H., 'Magnetic Flux Density Distribution on the Track Surface of Rollingelement Bearings - An Experimental and Theoretical Investigation', Tribol. Trans, 39(2), 386-391, 1996.
    • (1996) Tribol. Trans , vol.39 , Issue.2 , pp. 386-391
    • Prashad, H.1
  • 91
    • 0033309332 scopus 로고    scopus 로고
    • Determination of Magnetic Flux Density on the Surfaces of Rollingelement Bearings as an Indication of the Current That Has Passed Through Them - An Investigation
    • Prashad, H., 'Determination of Magnetic Flux Density on the Surfaces of Rollingelement Bearings as an Indication of the Current That Has Passed Through Them - An Investigation', Tribol. Int., 32, 455-467, 1999.
    • (1999) Tribol. Int. , vol.32 , pp. 455-467
    • Prashad, H.1
  • 92
    • 41449100131 scopus 로고    scopus 로고
    • 'Determination of Magnetic Flux Density on the Surfaces of Rollingelement Bearings - An Investigation'
    • August 2000
    • Prashad, H., 'Determination of Magnetic Flux Density on the Surfaces of Rollingelement Bearings - An Investigation', BHEL J., 21(2), 49-66, August 2000.
    • BHEL J. , vol.21 , Issue.2 , pp. 49-66
    • Prashad, H.1
  • 93
    • 0023105740 scopus 로고
    • Effects of Operating Parameters on the Threshold Voltages and Impedance Response on Non-insulated Rolling-Element Bearings under the Influence of Electrical Currents
    • Prashad, H., 'Effects of Operating Parameters on the Threshold Voltages and Impedance Response on Non-insulated Rolling-Element Bearings under the Influence of Electrical Currents', Wear, 117, 223-240, 1987.
    • (1987) Wear , vol.117 , pp. 223-240
    • Prashad, H.1
  • 94
    • 0024067729 scopus 로고
    • Theoretical Analysis of Impedance, Capacitance and Charge Accumulation of Roller Bearings Operated Under Electrical Fields
    • 1988. Also in BHEL J., 9(2), 21-30
    • Prashad, H., 'Theoretical Analysis of Impedance, Capacitance and Charge Accumulation of Roller Bearings Operated Under Electrical Fields', Wear, 125, 223-239, 1988. Also in BHEL J., 9(2), 21-30, 1988.
    • (1988) Wear , vol.125 , pp. 2-239
    • Prashad, H.1
  • 95
    • 0024662137 scopus 로고
    • Analysis of the Effects of Electrical Currents on Contact Temperature, Residual Stresses, and Slip Bands Initiation on Roller Tracks of Roller Bearings
    • Prashad, H., 'Analysis of the Effects of Electrical Currents on Contact Temperature, Residual Stresses, and Slip Bands Initiation on Roller Tracks of Roller Bearings', Wear, 131, 1-14, 1989.
    • (1989) Wear , vol.131 , pp. 1-14
    • Prashad, H.1
  • 96
    • 0025156425 scopus 로고
    • Theoretical Analysis of the Effects of Instantaneous Charge Leakage on Roller Bearings Lubricated with High Resistivity Lubricants under the Influence of Electric Current
    • Prashad, H., 'Theoretical Analysis of the Effects of Instantaneous Charge Leakage on Roller Bearings Lubricated with High Resistivity Lubricants under the Influence of Electric Current', Trans. ASME, J. Tribol., 112, 37-43, 1990.
    • (1990) Trans. ASME, J. Tribol. , vol.112 , pp. 37-43
    • Prashad, H.1
  • 97
    • 0026940662 scopus 로고    scopus 로고
    • 'Theoretical Analysis of Capacitive Effect of Roller Bearings on Repeated Starts and Stops of a Machine Operating under the Influence of Shaft Voltages'
    • October 1992
    • Prashad, H., 'Theoretical Analysis of Capacitive Effect of Roller Bearings on Repeated Starts and Stops of a Machine Operating under the Influence of Shaft Voltages', Trans. ASME, J. Tribol., 114, 818-822, October 1992.
    • Trans. ASME, J. Tribol. , vol.114 , pp. 818-822
    • Prashad, H.1
  • 98
    • 84882723630 scopus 로고    scopus 로고
    • 'Review of Published Data and Their Application to the Design of Large Bearings for Steam Turbines'
    • Ramsden, P., 'Review of Published Data and Their Application to the Design of Large Bearings for Steam Turbines', Proc. Inst. Mech. Eng., 182, pt 3A, 1967-68.
    • Proc. Inst. Mech. Eng. , vol.182 , Issue.PART 3A
    • Ramsden, P.1
  • 99
    • 84882735403 scopus 로고    scopus 로고
    • 'Calculation Methods for Steadily Loaded Pressure-fed Hydrodynamic Journal Bearings', Engineering Science Data, Item No. 66023, ASME, 1965.
    • 'Calculation Methods for Steadily Loaded Pressure-fed Hydrodynamic Journal Bearings', Engineering Science Data, Item No. 66023, ASME, 1965.
  • 100
    • 41449097240 scopus 로고
    • 'Determination of Oil Temperature in Load Carrying Oil Film in Journal Bearings'
    • YDK 621, 436-233, 21.00.1.5
    • Yakhin, Z.A., 'Determination of Oil Temperature in Load Carrying Oil Film in Journal Bearings', Russian Eng. J. YDK 621, 436-233, 21.00.1.5, 21-23, 1973.
    • (1973) Russian Eng. J , pp. 21-23
    • Yakhin, Z.A.1
  • 101
    • 84882666988 scopus 로고
    • 'Friction and Thermal Characteristics of Radial Bearing'
    • Series F
    • Nika, A., 'Friction and Thermal Characteristics of Radial Bearing', Russian J. Friction Lubr., No. 3, Series F, 1-7, 1970.
    • (1970) Russian J. Friction Lubr., No. 3 , pp. 1-7
    • Nika, A.1
  • 102
    • 85042244838 scopus 로고
    • 'Maximum Temperature for Hydrodynamic Bearings under Steady Load'
    • Booser, E.R., Ryan, F.D. and Linkinhaker, C.L., 'Maximum Temperature for Hydrodynamic Bearings under Steady Load', ASLE, 1970.
    • (1970) ASLE
    • Booser, E.R.1    Ryan, F.D.2    Linkinhaker, C.L.3
  • 104
    • 84882718741 scopus 로고
    • Boundary Limit of Load-carrying Oil Film in Sliding Bearing
    • Petrunichev, A.E., 'Boundary Limit of Load-carrying Oil Film in Sliding Bearing', Izveschiya AH USSR, Mashinovegenue, 4, 24-30, 1971.
    • (1971) Izveschiya AH USSR, Mashinovegenue , vol.4 , pp. 24-30
    • Petrunichev, A.E.1
  • 105
    • 84882641127 scopus 로고    scopus 로고
    • 'Analysis of Bearings Operating in Turbulent Regime'
    • March 1982
    • Contantinescu, V.N., 'Analysis of Bearings Operating in Turbulent Regime', J. Basic Eng., 82-92, March 1982.
    • J. Basic Eng. , pp. 82-92
    • Contantinescu, V.N.1
  • 106
    • 0015977145 scopus 로고    scopus 로고
    • 'Turbulent Lubrication - Its Genesis and Role in Modern Design'
    • January 1974
    • Wilcock, D.F., 'Turbulent Lubrication - Its Genesis and Role in Modern Design', Trans. ASME, January 1974.
    • Trans. ASME
    • Wilcock, D.F.1
  • 107
    • 0020258835 scopus 로고    scopus 로고
    • 'A Study of the Thermohydrodynamic Performance of a Plain Journal Bearing - Comparison between Theory and Experiments'
    • Washington, DC, 5-7, October 1982, Paper No. 82-Lub-16.
    • Ferron, J., Frene, J. and Boncompain, R., 'A Study of the Thermohydrodynamic Performance of a Plain Journal Bearing - Comparison between Theory and Experiments', ASME/ASLE Joint Lubrication Conference, Washington, DC, 5-7, October 1982, Paper No. 82-Lub-16.
    • ASME/ASLE Joint Lubrication Conference
    • Ferron, J.1    Frene, J.2    Boncompain, R.3
  • 108
    • 0023844583 scopus 로고
    • The Effect of Viscosity and Clearance on the Performance of Hydrodynamic Journal Bearings
    • Prashad, H., 'The Effect of Viscosity and Clearance on the Performance of Hydrodynamic Journal Bearings', STLE Trans., 31(1), 113-119, 1988.
    • (1988) STLE Trans. , vol.31 , Issue.1 , pp. 113-119
    • Prashad, H.1
  • 109
    • 84882703878 scopus 로고
    • A Simplified Procedure to Study the Effect of oil Grades and Clearance Ratios on Reliability of Performance of Cylindrical Bearings
    • Prashad, H., 'A Simplified Procedure to Study the Effect of oil Grades and Clearance Ratios on Reliability of Performance of Cylindrical Bearings', BHEL J., 10(2), 39-56, 1989.
    • (1989) BHEL J. , vol.10 , Issue.2 , pp. 39-56
    • Prashad, H.1
  • 110
    • 0016878509 scopus 로고
    • 'Determination of Dimensions of a Spherical Bearing'
    • V.D.C. 621.828.001.24 Russian Eng. J.)
    • Zandfos, L.V., 'Determination of Dimensions of a Spherical Bearing', Vestnik Mashinostroeniya, 56(7) (V.D.C. 621.828.001.24 Russian Eng. J.), 37-38, 1976.
    • (1976) Vestnik Mashinostroeniya , vol.56 , Issue.7 , pp. 37-38
    • Zandfos, L.V.1
  • 111
    • 0015743931 scopus 로고
    • Moment of Friction of a Spherical Bearing
    • Zandfos, L.V., 'Moment of Friction of a Spherical Bearing', Izv. Vuzov, Mashinostroenie, 9, 34-38, 1973.
    • (1973) Izv. Vuzov, Mashinostroenie , vol.9 , pp. 34-38
    • Zandfos, L.V.1
  • 115
    • 84882672956 scopus 로고
    • 'The Effect of Bearing Design on the Reliability of Journal Bearing Behaviour'
    • Paper No. C 308/73
    • Peeken, H., 'The Effect of Bearing Design on the Reliability of Journal Bearing Behaviour', Institute of Mechanical Engineers, Paper No. C 308/73, pp. 407-413, 1973.
    • (1973) Institute of Mechanical Engineers , pp. 407-413
    • Peeken, H.1
  • 116
    • 84882635234 scopus 로고
    • 'A Simplified Design Methodology for Determination of Optimum Values of Design Parameters of Spherical Seating of Hydrodynamic Journal Bearings
    • Prashad, H., 'A Simplified Design Methodology for Determination of Optimum Values of Design Parameters of Spherical Seating of Hydrodynamic Journal Bearings", BHEL J., 10(1), 45-50, 1989.
    • (1989) BHEL J. , vol.10 , Issue.1 , pp. 45-50
    • Prashad, H.1
  • 117
    • 0021375541 scopus 로고
    • Oxidation Stability of Steam Turbine Oil and Laboratory Methods of Evaluation
    • Goel, P.K., Jaya Prakash, K.C and Srivastava S.P., 'Oxidation Stability of Steam Turbine Oil and Laboratory Methods of Evaluation', ASLE Trans., 2, 89-95, 1984.
    • (1984) ASLE Trans. , vol.2 , pp. 89-95
    • Goel, P.K.1    Jaya Prakash, K.C.2    Srivastava, S.P.3
  • 118
    • 0021411473 scopus 로고
    • High Temperature Oxidation Testing of Lubricating Oil
    • Warne, T.M. and Vienna, P.C., 'High Temperature Oxidation Testing of Lubricating Oil', ASLE Trans., 40, 211-217, 1984.
    • (1984) ASLE Trans. , vol.40 , pp. 211-217
    • Warne, T.M.1    Vienna, P.C.2
  • 119
    • 85040499465 scopus 로고
    • Control of Turbine Oil Degradation During Use
    • Herderm, D., Vienna, P.C., 'Control of Turbine Oil Degradation During Use', ASLE Trans., 37, 67-71, 1980.
    • (1980) ASLE Trans. , vol.37 , pp. 67-71
    • Herderm, D.1    Vienna, P.C.2
  • 120
    • 84882641188 scopus 로고    scopus 로고
    • 'Life Estimation of Turbine Oils - A Methodology Criterion for Acceptance'
    • January, New Delhi
    • Murthy, T.S.R., Prashad, H. and Jagga, C.R., 'Life Estimation of Turbine Oils - A Methodology Criterion for Acceptance', Petrotech 2003, 9-12, January, New Delhi.
    • (2003) Petrotech , pp. 9-12
    • Murthy, T.S.R.1    Prashad, H.2    Jagga, C.R.3
  • 121
    • 0015600235 scopus 로고    scopus 로고
    • 'Identification of Principal Factors Causing Unbalanced Magnetic Pull in Cage Induction Motors'
    • March 1973
    • Binns, K.J. and Dye, M., 'Identification of Principal Factors Causing Unbalanced Magnetic Pull in Cage Induction Motors', Proc. IEE, 120(3), 349-354, March 1973.
    • Proc. IEE , vol.120 , Issue.3 , pp. 349-354
    • Binns, K.J.1    Dye, M.2
  • 122
    • 84882664913 scopus 로고    scopus 로고
    • 'Experimental Method for Determining the UMP in AC Induction Motors'
    • July 1970
    • Ecbert, J. and Gahleitner, A., 'Experimental Method for Determining the UMP in AC Induction Motors', ERA Trans. - 2792, July 1970.
    • (2792) ERA Trans.
    • Ecbert, J.1    Gahleitner, A.2
  • 123
    • 84882721272 scopus 로고
    • UMP in Rotating Electric Machine - Survey of Published Work
    • ERA Report z/T 142
    • Vonkachne, P., UMP in Rotating Electric Machine - Survey of Published Work, ERA Report z/T 142, 1963.
    • (1963)
    • Vonkachne, P.1
  • 124
    • 33749934647 scopus 로고    scopus 로고
    • Air Gap Eccentricity in Induction Motors
    • ERA 74-1188, July 1974
    • Rai, G.B., Air Gap Eccentricity in Induction Motors, ERA 74-1188, July 1974.
    • Rai, G.B.1
  • 125
    • 33846190771 scopus 로고
    • 'Magnetic Pull in Electric Machines'
    • Rosenbery, E., 'Magnetic Pull in Electric Machines', AIEE Trans., pp. 1069-1113, 1918.
    • (1918) AIEE Trans. , pp. 1069-1113
    • Rosenbery, E.1
  • 126
    • 84882676163 scopus 로고
    • 'Performance Evaluation of A.C. Motors through Experimental Determination of Axial Force on Bearings'
    • Prashad, H. and Shastry, K.S., 'Performance Evaluation of A.C. Motors through Experimental Determination of Axial Force on Bearings', Condition Monitoring Seminar, Ahmedabad (India), pp. MF 15-20, 1986.
    • (1986) Condition Monitoring Seminar, Ahmedabad (India) , pp. 15-20
    • Prashad, H.1    Shastry, K.S.2
  • 127
    • 0023844583 scopus 로고
    • The Effects of Viscosity and Clearance on the Performance of Hydrodynamic Journal Bearings
    • Prashad, H., 'The Effects of Viscosity and Clearance on the Performance of Hydrodynamic Journal Bearings', STLE Trans., 31(1), 113-119, 1988.
    • (1988) STLE Trans. , vol.31 , Issue.1 , pp. 113-119
    • Prashad, H.1
  • 129
    • 0019441650 scopus 로고    scopus 로고
    • 'Diagnosing Induction Motor Vibration'
    • January 1981
    • Maxwell, J.H., 'Diagnosing Induction Motor Vibration', Hydrocarbon Proc., 60, 117-120, January 1981.
    • Hydrocarbon Proc. , vol.60 , pp. 117-120
    • Maxwell, J.H.1
  • 130
    • 84882604697 scopus 로고
    • Vibration in Induction Motors - Concepts, Nature, Analysis and Control
    • Gupta, S.K., 'Vibration in Induction Motors - Concepts, Nature, Analysis and Control', BHEL J., 5(1) 1-8, 1981.
    • (1981) BHEL J. , vol.5 , Issue.1 , pp. 1-8
    • Gupta, S.K.1
  • 131
    • 84882570747 scopus 로고    scopus 로고
    • 'Criteria for Assessing Mechanical Vibrations of Machines', VDI 2056, Oct. 1964
    • 'Criteria for Assessing Mechanical Vibrations of Machines', VDI 2056, Oct. 1964.
  • 132
    • 0002688314 scopus 로고    scopus 로고
    • 'Vibration and Indicating Tool'
    • March 1968
    • Baxter, R.L. and Bernhard, D.L., 'Vibration and Indicating Tool', Mech. Eng., 60-65, March 1968.
    • Mech. Eng. , pp. 60-65
    • Baxter, R.L.1    Bernhard, D.L.2
  • 133
    • 84882695994 scopus 로고
    • Analysis of Time Bound Increase in Vibrations of Large Synchronous Electric Motor - An Investigation
    • Prashad, H. and Rai, L.N., 'Analysis of Time Bound Increase in Vibrations of Large Synchronous Electric Motor - An Investigation', BHEL J., 13, 54-61, 1992.
    • (1992) BHEL J. , vol.13 , pp. 54-61
    • Prashad, H.1    Rai, L.N.2
  • 134
    • 0023768002 scopus 로고
    • Investigations of Corrugated Pattern on the Surface of Roller Bearings Operated under the Influence of Electrical Fields
    • Prashad, H., 'Investigations of Corrugated Pattern on the Surface of Roller Bearings Operated under the Influence of Electrical Fields', Lub. Eng., 44(8), 710-718, 1988.
    • (1988) Lub. Eng. , vol.44 , Issue.8 , pp. 710-718
    • Prashad, H.1
  • 135
    • 0004054303 scopus 로고
    • Prediction of Bearing Wear Due to Shaft Voltage in Electrical Machines
    • Bradford, M., Prediction of Bearing Wear Due to Shaft Voltage in Electrical Machines, ERA Technology Limited, 1984.
    • (1984) ERA Technology Limited
    • Bradford, M.1
  • 136
    • 0026120426 scopus 로고
    • Theoretical and Experimental Investigation on the Pitch and Width of Corrugations on the Surface of Ball Bearings
    • Prashad, H., 'Theoretical and Experimental Investigation on the Pitch and Width of Corrugations on the Surface of Ball Bearings', Wear, 143, 1-14, 1991.
    • (1991) Wear , vol.143 , pp. 1-14
    • Prashad, H.1
  • 137
    • 0023105740 scopus 로고
    • Effects of Operating Parameters on the Threshold Voltages and Impedance Response of Non-insulated Rolling-element Bearings Under the Action of Electric Current
    • Prashad, H., 'Effects of Operating Parameters on the Threshold Voltages and Impedance Response of Non-insulated Rolling-element Bearings Under the Action of Electric Current', Wear, 117, 223-240, 1987.
    • (1987) Wear , vol.117 , pp. 223-240
    • Prashad, H.1
  • 138
    • 0024050984 scopus 로고
    • The Effect of Current Leakage on Electro-adhesion Forces in Rollingfriction and Magnetic Flux Density Distribution on the Surface of Rolling-element Bearings
    • Prashad, H., 'The Effect of Current Leakage on Electro-adhesion Forces in Rollingfriction and Magnetic Flux Density Distribution on the Surface of Rolling-element Bearings', ASME, J. Tribol., 110, 448-455, 1988.
    • (1988) ASME, J. Tribol. , vol.110 , pp. 448-455
    • Prashad, H.1
  • 139
    • 0024641574 scopus 로고
    • Diagnosis of Deterioration of Lithium Greases used in Rollingelement Bearings by X-ray Diffractrometry
    • Prashad, H., 'Diagnosis of Deterioration of Lithium Greases used in Rollingelement Bearings by X-ray Diffractrometry', Tribol. Trans., 32(2), 205-214, 1989.
    • (1989) Tribol. Trans. , vol.32 , Issue.2 , pp. 205-214
    • Prashad, H.1
  • 140
    • 0028486351 scopus 로고
    • Investigation of Damaged Rolling-element Bearings and Deterioration of Lubricants under the Influence of Electric Current
    • Prashad, H., 'Investigation of Damaged Rolling-element Bearings and Deterioration of Lubricants under the Influence of Electric Current', Wear, 176, 151-161, 1994.
    • (1994) Wear , vol.176 , pp. 151-161
    • Prashad, H.1
  • 141
    • 0030111522 scopus 로고    scopus 로고
    • 'Magnetic Flux Density Distribution on the Track Surface of Rollingelement Bearings - An Experimental and Theoretical Investigation' Tribol
    • April 1996
    • Prashad, H., 'Magnetic Flux Density Distribution on the Track Surface of Rollingelement Bearings - An Experimental and Theoretical Investigation' Tribol. Tran., 39(2), 386-391, April 1996.
    • Tran. , vol.39 , Issue.2 , pp. 386-391
    • Prashad, H.1
  • 142
    • 0022184150 scopus 로고    scopus 로고
    • 'Effects of Magnetic Flux on Rolling-element Bearings'
    • Sept. Publication 254
    • Tasker, J.L. and Graham, R.S., 'Effects of Magnetic Flux on Rolling-element Bearings', IEE Conference, 17-19, Sept. Publication 254, pp. 152-156, 1985.
    • (1985) IEE Conference, 17-19 , pp. 152-156
    • Tasker, J.L.1    Graham, R.S.2
  • 143
    • 0030268005 scopus 로고    scopus 로고
    • Diagnosis of Failure of Rolling-element Bearings of Alternators - A Study
    • Prashad, H., 'Diagnosis of Failure of Rolling-element Bearings of Alternators - A Study', Wear, 198, 46-51, 1996.
    • (1996) Wear , vol.198 , pp. 46-51
    • Prashad, H.1
  • 144
    • 0002916659 scopus 로고
    • The Causes and Control of Electrical Currents in Bearings
    • Boyd, J. and Kaufman, H.N., 'The Causes and Control of Electrical Currents in Bearings', Lub. Eng., 15(1), 28-35, 1988.
    • (1988) Lub. Eng. , vol.15 , Issue.1 , pp. 28-35
    • Boyd, J.1    Kaufman, H.N.2
  • 145
    • 5544222528 scopus 로고
    • Flow of Electrical Currents Through Lubricated Contacts
    • Chu, P.S.Y. and Cameron, A., 'Flow of Electrical Currents Through Lubricated Contacts', ASLE Trans., 10, 226-234, 1967.
    • (1967) ASLE Trans. , vol.10 , pp. 226-234
    • Chu, P.S.Y.1    Cameron, A.2
  • 146
    • 0004054303 scopus 로고
    • 'Prediction of Bearing Wear due to Shaft Voltage in Electrical Machines'
    • ERA Technology Limited
    • Bradford, M., 'Prediction of Bearing Wear due to Shaft Voltage in Electrical Machines', ERA Technology Limited, 1990.
    • (1990)
    • Bradford, M.1
  • 147
    • 0023105740 scopus 로고
    • Effects of Operating Parameters on the Threshold Voltages on Noninsulated Rolling-element Bearings under the Action of Electrical Currents
    • Prashad, H., 'Effects of Operating Parameters on the Threshold Voltages on Noninsulated Rolling-element Bearings under the Action of Electrical Currents', Wear, 117, 223-240, 1987.
    • (1987) Wear , vol.117 , pp. 223-240
    • Prashad, H.1
  • 148
    • 0028468871 scopus 로고
    • Analysis of Capacitive Effect and Life Estimation of Hydrodynamic Journal Bearings on Repeated Starts and Stops of a Machine operating under the Influence of Shaft Voltage
    • Prashad, H. and Rao, K.N., 'Analysis of Capacitive Effect and Life Estimation of Hydrodynamic Journal Bearings on Repeated Starts and Stops of a Machine operating under the Influence of Shaft Voltage', Tribol. Trans., 37(3), 641-645, 1994.
    • (1994) Tribol. Trans. , vol.37 , Issue.3 , pp. 641-645
    • Prashad, H.1    Rao, K.N.2
  • 149
    • 0003318583 scopus 로고
    • Analysis of Inductive Effects of Bearings under the Influence of Shaft Voltages
    • Prashad, H., 'Analysis of Inductive Effects of Bearings under the Influence of Shaft Voltages', BHEL J., 15(1), 26-31, 1994.
    • (1994) BHEL J. , vol.15 , Issue.1 , pp. 26-31
    • Prashad, H.1
  • 151
    • 0029378712 scopus 로고
    • 'Diagnosis of Bearing Problem of Synchronous Condenser-An Experimental and Theoretical Investigation'
    • Prashad, H., 'Diagnosis of Bearing Problem of Synchronous Condenser-An Experimental and Theoretical Investigation', Wear, 188, 97-101, 1995.
    • (1995) Wear , vol.188 , pp. 97-101
    • Prashad, H.1
  • 152
    • 84882573965 scopus 로고
    • Pump Handbook, edited by Karassik, J., Kritzsch, W.C., Fraser, W.H. and Messina, J.P., McGraw-Hill, New York
    • Pump Handbook, edited by Karassik, J., Kritzsch, W.C., Fraser, W.H. and Messina, J.P., McGraw-Hill, New York, 1976.
    • (1976)
  • 153
    • 84882651806 scopus 로고
    • Pump Application Engineering, Hicks, T.G. and Edwards, T.W. McGraw-Hill, New York
    • Pump Application Engineering, Hicks, T.G. and Edwards, T.W. McGraw-Hill, New York, 1971.
    • (1971)
  • 154
    • 84882718801 scopus 로고    scopus 로고
    • International Standard ISO 2372 and ISO 3945-1977(8)
    • International Standard ISO 2372 and ISO 3945-1977(8).
  • 157
    • 0020599670 scopus 로고
    • 'Smooth Operation and High Degree of Safety, Large Rolling Bearings in the Wind Power Station GROWAN', Ball Roller Bearing Eng.
    • 'Smooth Operation and High Degree of Safety, Large Rolling Bearings in the Wind Power Station GROWAN', Ball Roller Bearing Eng. (1) 1983.
    • (1983) , Issue.1
  • 158
    • 84882647355 scopus 로고
    • Bearings and Design Modifications for Trouble-free and Reliable Operation of Horizontal-axis Windmills used for PumpingWater
    • Prashad, H. and Gupta, R.P., 'Bearings and Design Modifications for Trouble-free and Reliable Operation of Horizontal-axis Windmills used for PumpingWater', BHEL J., 7(1), 14-19, 1986.
    • (1986) BHEL J. , vol.7 , Issue.1 , pp. 14-19
    • Prashad, H.1    Gupta, R.P.2
  • 160
    • 84882623259 scopus 로고
    • Magnetic Suspension of the Watt Hour Meter Rotor
    • Trekeli, H.F., Mendelssohn, L.I. and Wright, J.H., 'Magnetic Suspension of the Watt Hour Meter Rotor', Trans. AIEE, 57, 1180, 1948.
    • (1948) Trans. AIEE , vol.57 , pp. 1180
    • Trekeli, H.F.1    Mendelssohn, L.I.2    Wright, J.H.3
  • 161
    • 84882713996 scopus 로고    scopus 로고
    • Magnetic Suspension Bearings, GEC Publication No. M5-002E, UK.
    • Magnetic Suspension Bearings, GEC Publication No. M5-002E, UK.
  • 164
    • 84882568834 scopus 로고
    • Magnetic Suspension Bearings for A.C. Energy Meters
    • Bhargava, S.C. and Prashad, H., 'Magnetic Suspension Bearings for A.C. Energy Meters', BHEL J., 6(2), 12-21, 1985.
    • (1985) BHEL J. , vol.6 , Issue.2 , pp. 12-21
    • Bhargava, S.C.1    Prashad, H.2
  • 165
    • 0002847744 scopus 로고
    • Tribology for Aerospace Application
    • SKF
    • Anderson, W.J., Tribology for Aerospace Application, SKF, pp. 526-528, 1973.
    • (1973) , pp. 526-528
    • Anderson, W.J.1
  • 167
    • 79953030603 scopus 로고
    • 'Cage and Roller Slip in High Speed Roller Bearings'
    • Boness, R.J., 'Cage and Roller Slip in High Speed Roller Bearings', J. Mech. Sci., II, 2, 1969.
    • (1969) J. Mech. Sci. , vol.2 , pp. 2
    • Boness, R.J.1
  • 168
    • 0002866114 scopus 로고
    • Some Aspects of the Performance of High Speed Lightly Loaded Cylindrical Roller Bearing
    • Smith, C.F., 'Some Aspects of the Performance of High Speed Lightly Loaded Cylindrical Roller Bearing', Proc. Inst. Mech. Eng., 176(227), 566, 1962.
    • (1962) Proc. Inst. Mech. Eng. , vol.176 , Issue.227 , pp. 566
    • Smith, C.F.1
  • 170
    • 84958342202 scopus 로고
    • An Analytical Method to Predict Skidding in High Speed Roller Bearings
    • Harris, T.A., 'An Analytical Method to Predict Skidding in High Speed Roller Bearings', ASLE Trans., 9(3), 229-241, 1966.
    • (1966) ASLE Trans. , vol.9 , Issue.3 , pp. 229-241
    • Harris, T.A.1
  • 171
    • 0022954678 scopus 로고
    • The Effect of Cage and Roller Slip on the Measured Defect Frequency Response of Rolling Element Bearing
    • Prashad, H., 'The Effect of Cage and Roller Slip on the Measured Defect Frequency Response of Rolling Element Bearing', ASLE Trans, 30(3), 360-367, 1986.
    • (1986) ASLE Trans , vol.30 , Issue.3 , pp. 360-367
    • Prashad, H.1
  • 174
    • 84882584728 scopus 로고
    • 'Test Rig for Axle Box Bearings for High Speed Trains'
    • Burnaby Lautier, E. and Jutpass, E.R.C., 'Test Rig for Axle Box Bearings for High Speed Trains', Ball Bearing J., 141, 1978.
    • (1978) Ball Bearing J. , vol.141
    • Burnaby Lautier, E.1    Jutpass, E.R.C.2
  • 175
    • 0038217522 scopus 로고
    • 'SKF "THISBE" Test Rig'
    • SKF Report No. NL 777515
    • Beagley, T.M., 'SKF "THISBE" Test Rig', SKF Report No. NL 777515, 1978.
    • (1978)
    • Beagley, T.M.1
  • 176
    • 0034762243 scopus 로고    scopus 로고
    • 'A New Generation Double Decker High Precision Rolling-element Bearings - Concept, Development and Investigations'
    • April 2001
    • Prashad, H., 'A New Generation Double Decker High Precision Rolling-element Bearings - Concept, Development and Investigations', Tribol. Trans., 44(2), 203-208, April 2001.
    • Tribol. Trans. , vol.44 , Issue.2 , pp. 203-208
    • Prashad, H.1
  • 177
    • 2542598222 scopus 로고    scopus 로고
    • 'New Generation Rolling-element Bearings - An Investigation'
    • October 2002
    • Prashad, H., 'New Generation Rolling-element Bearings - An Investigation', BHEL J., 23(2), 43-56, October 2002.
    • BHEL J. , vol.23 , Issue.2 , pp. 43-56
    • Prashad, H.1
  • 178
    • 0036539103 scopus 로고    scopus 로고
    • Relative Comparison of Stiffness and Damping Properties of Double Decker High Precision and Conventional Rolling-element Bearing
    • Prashad, H., 'Relative Comparison of Stiffness and Damping Properties of Double Decker High Precision and Conventional Rolling-element Bearing', Tribol. Int., 35, 265-269, 2002.
    • (2002) Tribol. Int. , vol.35 , pp. 265-269
    • Prashad, H.1
  • 179
    • 0037366431 scopus 로고    scopus 로고
    • 'Experimental Evaluation of the Stress Distribution on the Outer Surface of the Outer Race of Conventional and Double Decker High Precision Bearing'
    • March 2003
    • Prashad, H., 'Experimental Evaluation of the Stress Distribution on the Outer Surface of the Outer Race of Conventional and Double Decker High Precision Bearing', Tribo. Test, J., 9(3), 249-260, March 2003.
    • Tribo. Test, J. , vol.9 , Issue.3 , pp. 249-260
    • Prashad, H.1
  • 180
    • 2542546302 scopus 로고    scopus 로고
    • 'Pattern of Cyclic Stresses on Outer Race of Conventional Bearings vis-à-vis Double Decker High Precision Bearing - An Investigation'
    • June 2003
    • Prashad, H., 'Pattern of Cyclic Stresses on Outer Race of Conventional Bearings vis-à-vis Double Decker High Precision Bearing - An Investigation', BHEL J., 24(2) 38-47, June 2003.
    • BHEL J. , vol.24 , Issue.2 , pp. 38-47
    • Prashad, H.1
  • 181
    • 0038374374 scopus 로고    scopus 로고
    • 'Energy Efficient Bearings - An Investigation'
    • June 2003
    • Prashad, H., 'Energy Efficient Bearings - An Investigation', J. Lub. Eng., 59(6) 17-22, June 2003.
    • J. Lub. Eng. , vol.59 , Issue.6 , pp. 17-22
    • Prashad, H.1
  • 182
    • 2542624441 scopus 로고    scopus 로고
    • 'A Theoretical Approach to Evaluating the Performance Characteristics of Double Decker High-Precision Bearings'
    • March 2004
    • Prashad, H., 'A Theoretical Approach to Evaluating the Performance Characteristics of Double Decker High-Precision Bearings', Tribotest, J., 10(3), 251-263, March 2004.
    • Tribotest, J. , vol.10 , Issue.3 , pp. 251-263
    • Prashad, H.1
  • 183
    • 84882571617 scopus 로고    scopus 로고
    • 'An Analysis of Axial Deflection of Double Decker High Precision Bearings vis-à-vis Conventional Ball Bearings'
    • Prashad, H., 'An Analysis of Axial Deflection of Double Decker High Precision Bearings vis-à-vis Conventional Ball Bearings', J. Lub. Eng., 2006.
    • (2006) J. Lub. Eng.
    • Prashad, H.1
  • 184
    • 33646418802 scopus 로고    scopus 로고
    • 'Centrifugal Forces on Double Decker High Precision and Conventional Ball Bearings'
    • July 2005
    • Prashad, H., 'Centrifugal Forces on Double Decker High Precision and Conventional Ball Bearings', J. Inst. Eng. (I), 86, 109-114, July 2005.
    • J. Inst. Eng. (I) , vol.86 , pp. 109-114
    • Prashad, H.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.