A historical overview of aeroelasticity branch and transonic dynamics tunnel contributions to rotorcraft technology and development

NASA Technical Memorandum

Volumn , Issue 211054, 2001, Pages

  Yeager Jr , William T ^a   Kvaternik, Raymond G ^a  

^a NASA LANGLEY RESEARCH CENTER   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 27844573006     PISSN: 04999320     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Review

References (274)

1. Reed, W. H., III: Aeroelasticity Matters: Some Reflections on Two Decades of Testing in the NASA Langley Transonic Dynamics Tunnel. NASA TM-83210, September 1981.
2. Doggett, R. V., Jr.; and Cazier, F. W., Jr.: Aircraft Aeroelasticity and Structural Dynamics Research at the NASA Langley Research Center - Some Illustrative Results. NASA TM 100627, May 1988.
3. Ricketts, R. H.: Experimental Aeroelasticity History, Status and Future in Brief. NASA TM 102651, April 1990.
4. Perry, B., III; and Noll, T. E.: Activities in Aeroelasticity at NASA Langley Research Center. Fourth International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise, ASME, Dallas, TX, November 16-21, 1997.
5. Kvaternik, R. G.: A Review of Some Tilt-Rotor Aeroelastic Research at NASA-Langley. Journal of Aircraft, Vol. 13, No. 5, May 1976, pp. 357-363.
6. Hammond, C. E.; and Weller, W. H.: Wind-Tunnel Testing of Aeroelastically Scaled Helicopter Rotor Blades. Army Science Conference, West Point, NY, June 1976.
7. Mantay, W. R.; Yeager, W. T., Jr.; Hamouda, M-N; Cramer, R. G., Jr.; and Langston, C. W.: Aeroelastic Model Helicopter Rotor Testing in the Langley TDT. NASA TM 86440 (USA AVSCOM Technical Memorandum 85-B-5), June 1985.
8. th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 1991.
9. Kvaternik, R. G.: A Historical Overview of Tiltrotor Aeroelastic Research at Langley Research Center. NASA TM 107578, April 1992.
10. Notes on the Proceedings of the 1939 Meeting of the Aircraft Industry with the National Advisory Committee for Aeronautics. Journal of the Aeronautical Sciences, Vol. 6, Number 7, May 1939, pp. 299-301.
11. Moxey, R. L.: Transonic Dynamics Wind Tunnel. Compressed Air Magazine, Vol. 68, Number 10, October 1963, pp. 8-13.
12. o Sweptback Wing Planform in Air and in Freon-12 in the Langley Transonic Dynamics Tunnel. NASA TN-1616, March 1963.
13. Lee, C.; Bruce, C.; and Kidd, D.: Wind-Tunnel Investigation of a Quarter-Scale Two-Bladed High-Performance Rotor in a Freon Atmosphere. USAAVLABS Tech. Rep. 70-58, U.S. Army, Feb. 1971.
14. Treon, S. L.; Hofstetter, W. R.; and Abbott, F. T., Jr.: On the Use of Freon-12 for Increasing Reynolds Number in Wind-Tunnel Testing of Three-Dimensional Aircraft Models at Subcritical and Supercritical Mach Numbers. Facilities and Techniques for Aerodynamic Testing at Transonic Speeds and High Reynolds Number, AGARD CP No. 83, Aug. 1971, pp. 27-1-27-8.
15. Yeager, W. T., Jr.; and Mantay, W. R.: Correlation of Full Scale Helicopter Rotor Performance in Air with Model-Scale Freon Data. NASA TN D-8323, November 1976.
16. th AIAA Advanced Measurement and Ground Testing Technology Conference, June 15-18, 1998, Albuquerque, NM (AIAA Paper 98-2710).
17. Cole, S. R.; and Garcia, J. L.: Past, Present and Future Capabilities of the Transonic Dynamics Tunnel From an Aeroelasticity Perspective. Presented at the AIAA Dynamics Specialists Conference, Atlanta, GA, April 5-6, 2000 (AIAA Paper 2000-1767).
18. Murphy, G.: Similitude in Engineering. The Ronald Press Co., New York, 1950.
19. Baker, W. E.; Westine, P. S.; and Dodge, F. T.: Similarity Methods in Engineering Dynamics. Hayden Book Company, Rochelle Park, New Jersey, 1973.
20. USAF/AIA: Proceedings of Symposium on Aeroelastic & Dynamic Modeling Technology. Dayton, OH, September 23-25, 1963. (AFFDL Report RTD-TDR-63-4197, Part I, March 1964.)
21. Regier, A. A.: The Use of Scaled Dynamic Models in Several Aerospace Vehicle Studies. Paper presented at ASME Colloquium on the Use of Models and Scaling in Shock and Vibration, Philadelphia, PA, November 1963, pp. 34-50.
22. Guyett, P. R.: The Use of Flexible Models in Aerospace Engineering. R.A.E. Technical Report No. 66335, November 1966.
23. Kuntz, W. H.; Wasserman, L. S.; and Alexander, H. R.: Dynamically Similar Model Tests of Rotary Wing and Propeller Types of VTOL Aircraft. Proceedings of the Air Force V/STOL Technology and Planning Conference, Las Vegas, NV, September 23-25, 1969.
24. Brooks, G. W.: The Application of Models to Helicopter Vibration and Flutter Research. Proceedings of the Ninth Annual Forum of the American Helicopter Society, Washington, D.C., May 14-17, 1953.
25. Fradenburgh, E. A.; and Kiely, E. F.: Development of Dynamic Model Rotor Blades for High Speed Helicopter Research. Journal of the American Helicopter Society, Vol. 9, Jan. 1964, pp. 3-20.
26. Albrecht, C. O.: Factors in the Design and Fabrication of Powered, Dynamically Similar V/STOL Wind Tunnel Models. American Helicopter Society Mid-East Region Symposium on the Status of Testing and Modeling Techniques for V/STOL Aircraft, Essington, PA, Oct. 26-28, 1972.
27. Ormiston, R. A.: Helicopter Modeling. Aeronautical Journal, Vol. 77, Nov. 1973, pp. 579-591.
28. Rabbott, J. P., Jr.: Model vs. Full Scale Rotor Testing. Proceedings of the CAL/AVLABS Symposium on Aerodynamics of Rotary Wing and V/STOL Aircraft (Vol. II - Wind Tunnel Testing), June 18-20, 1969, Buffalo, NY.
29. Kelly, M. W.: The Role of Wind Tunnel Testing in the Development of Advanced Rotary-Wing Aircraft. Prepared comments made as panel member, Wind tunnel Testing Panel Discussion at the AHS Mideast Region Symposium on Status of Testing and Modeling Techniques for V/STOL Aircraft, Essington, PA, Oct. 26-28, 1972.
30. Langhaar, H. L.: Dimensional Analysis and Theory of Models. John Wiley and Sons, Inc., 1956.
31. Templeton, H.: Models for Aero-Elastic Investigations. Aeronautical Research Council, Technical Report C.P. No. 255, Great Britain, 1956.
32. Molyneux, W. G.: Aeroelastic Modeling. RAE Tech Note Structures 353, March 1964.
33. Hunt, G. K.: Similarity Requirements for Aeroelastic Models of Helicopter Rotors. RAE Technical Report 72005, January 1972.
34. th Annual Conference of the Society of Aeronautical Weight Engineers, Inc., New Orleans, LA, May 13-16, 1968 (Paper No. 659).
35. Hanson, P. W.: An Assessment of the Future Roles of the National Transonic Facility and the Langley Transonic Dynamics Tunnel in Aeroelastic and Unsteady Aerodynamic Testing. NASA TM 81839, June 1980.
36. th AIAA Advanced Measurement and Ground Testing Technology Conference, Albuquerque, NM, June 15-18, 1998 (AIAA Paper 98-2881).
37. th Annual Forum of the American Helicopter Society, Washington, D.C., May 13-15, 1964.
38. Ward, J. F.: A Summary of Hingeless-Rotor Structural Loads and Dynamics Research. Journal of Sound and Vibration, Vol. 4, No.3, 1966, pp. 358-377.
39. Hanson, T. F.: Investigation of Elastic Coupling Phenomena of High-Speed Rigid Rotor Systems. U. S. Army TRECOM Technical Report 63-75, 1964.
40. Hanson, T. F.: Wind-Tunnel Tests of an Optimized, Matched-Stiffness Rigid Rotor. U. S. Army TRECOM Technical Report 64-56, 1964.
41. Lee, Charles D.; and White, James A.: Investigation of the Effect of Hub Support Parameters on Two-Bladed Rotor Oscillatory Loads. NASA CR-132435, May 1974.
42. Weller, William H.; and Lee Bill L.: Wind-Tunnel Tests of Wide-Chord Teetering Rotors With and Without Outboard Flapping Hinges. NASA Technical Paper 1046, Nov. 1977.
43. Weller, William H.: Load and Stability Measurements On a Soft-Inplane Rotor System Incorporating Elastomeric Lead-Lag Dampers. NASA TN D-8437, July 1977.
44. Doggett, R.V., Jr.; and Hammond, C.E.: Application of Interactive Computer Graphics in WindTunnel Dynamic Model Testing. Applications of Computer Graphics in Engineering, NASA SP-390, 1975, pp. 325-353.
45. Hammond, Charles E.; and Doggett, Robert V., Jr.: Determination of Subcritical Damping by Moving-Block/Randomdec. Applications. Flutter Testing Techniques, NASA SP-415, 1976, pp. 59-76.
46. Lemnios, A. Z.; and Smith, A. F.: An Analytical Evaluation of the Controllable Twist Rotor Performance and Dynamic Behavior. USAAMRDL Tech. Rep. 72-16, U.S. Army, May 1972.
47. Lemnios, A. Z.; Nettles, William E.; and Howes, H. E.: Full Scale Wind Tunnel Tests of a Controllable Twist Rotor. Proceedings of a Symposium on Rotor Technology, American Helicopter Society, Aug. 1976.
48. Doman, Glidden S.; Tarzanin, Frank J.; and Shaw, John, Jr.: Investigation of Aeroelastically Adaptive Rotor Systems. Proceedings of a Symposium on Rotor Technology, American Helicopter Society, Aug. 1976.
49. Blackwell, R. H.: Investigation of the Compliant Rotor Concept. Sikorsky Aircraft Division, United Technologies Corporation, USAAMRDL-TR-77-7, Eustis Directorate, USAAMRDL, Fort Eustis, VA. June 1977, AD 1042338.
50. Blackwell, R. H.; and Merkley, D. J.: The Aeroelastically Conformable Rotor Concept. Preprint No. 78-59, American Helicopter Society, May 1978.
51. Weller, William H.: Experimental Investigation of Effects of Blade Tip Geometry on Loads and Performance for an Articulated Rotor System. NASA Technical Paper 1303, January 1979.
52. Yeager, William T., Jr.; and Mantay, Wayne R.: Wind-Tunnel Investigation of the Effects of Blade Tip Geometry on the Interaction of Torsional Loads and Performance for an Articulated Helicopter Rotor. NASA Technical Paper 1926. December 1981.
53. th Annual Forum of the American Helicopter Society, Washington, D. C., May 1980.
54. Blackwell, R. H.; Murrill, R., J.; Yeager, William T., Jr.; and Mirick, P. H.: Wind-Tunnel Evaluation of Aeroelastically Conformable Rotors. Journal of the American Helicopter Society, vol. 26, no. 2, Apr. 1981, pp. 31-39.
55. Sutton, Lawrence R.; White, Richard P., Jr.; and Marker, Robert L.: Wind-Tunnel Evaluation of an Aeroelastically Conformable Rotor. USAAVRADCOM-TR-81-D-43, Applied Technology Laboratory, U.S. Army Research and Technology Laboratories, Ft. Eustis, Va., Mar. 1982.
56. Mantay, Wayne R.; and Yeager, William T., Jr.: Parametric Tip Effects for Conformable Rotor Applications. NASA Technical Memorandum 85682, August 1983.
57. Mantay, Wayne R.; and Yeager, William T., Jr.: Aeroelastic Considerations for Torsionally Soft Rotors. NASA Technical Memorandum 87687, Aug. 1986.
58. th Annual Forum of the American Helicopter Society, Washington, D.C., May 1980.
59. Hammond, C. E.; and Cline, J. H.: On the Use of Active Higher Harmonic Blade Pitch for Helicopter Vibration Reduction. Presented at the 12th Army Science Conference, West Point, New York, June 17-20, 1980.
60. Hammond, C.E.: Wind-Tunnel Results Showing Rotor Vibratory Loads Reduction Using Higher Harmonic Blade Pitch. Journal of the American Helicopter Society, Jan. 1983, pp. 10-15.
61. Molusis, J. A.; Hammond, C. E.; and Cline, John H.: A Unified Approach to the Optimal Design of Adaptive and Gain Scheduled Controllers to Achieve Minimum Rotor Vibration. Journal of the American Helicopter Society, Apr. 1983.
62. th Annual Forum of the American Helicopter Society, St. Louis, Missouri, May 1983.
63. Straub, F. K.; and Byrns, E. V., Jr.: Application of Higher Harmonic Blade Feathering on the OH-6A Helicopter for Vibration Reduction. NASA CR-4031, December 1986.
64. Yeager, William T., Jr.; Hamouda, M-Nabil; and Mantay, Wayne R.: Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight: Analysis and Wind Tunnel Tests. Presented at the Ninth European Rotorcraft Forum, Stresa, Italy, Sept. 1983.
65. Yeager, William T., Jr.; Hamouda, M-Nabil; and Mantay, Wayne R.: An Experimental Investigation of the Aeromechanical Stability of a Hingeless Rotor in Hover and Forward Flight. NASA TM-89107, USAAVSCOM TM 87-B-5, June 1987.
66. Johnson, W.: A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics, Part I - Analysis Development. NASA TM-81182, 1980.
67. Johnson, W.: A Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics, Part II - User's Manual. NASA TM-81183, 1980.
68. th Annual Forum, American Helicopter Society, May 1981, pp. 37-50.
69. Yeager, William T., Jr.; Mantay, Wayne R.; Wilbur, Matthew L.; Cramer, Robert G., Jr.; and Singleton, Jeffrey D.: Wind-Tunnel Evaluation of an Advanced Main-Rotor Blade Design for a Utility-Class Helicopter. NASA Technical Memorandum 89129, Sept. 1987.
70. Singleton, Jeffrey D.; Yeager, William T., Jr.; and Wilbur, Matthew L.: Performance Data From a Wind-Tunnel Test of Two Main-Rotor Blade Designs for a Utility-Class Helicopter. NASA Technical Memorandum 4183, June 1990.
71. Yeager, William T., Jr.; Hamouda, M-Nabil; Idol, Robert F.; Mirick, Paul H.; Singleton, Jeffrey D.; and Wilbur, Matthew L.: Vibratory Loads Data From a Wind-Tunnel Test of Structurally Tailored Model Helicopter Rotors. NASA Technical Memorandum 4265, Aug. 1991.
72. Yen, J. G.: Coupled Aeroelastic Hub Loads Reduction. Proceedings of the Theoretical Basis of Helicopter Technology Seminar, Part 3. Nanjing Aeronautical Inst. (Peoples's Republic of China) and American Helicopter Society, Inc., 1985, pp.D4-1-D4-9.
73. Yen, Jing G.; Yuce, Mithat; Chao, Chen-Fu; and Schillings, John: Validation of Rotor Vibratory Airloads and Application to Helicopter Response. Journal of the American Helicopter Society, vol. 35, no. 4, Oct. 1990, pp. 63-71.
74. th Annual Forum of the American Helicopter Society. Anaheim, Calif., May 1982.
75. th Annual Forum of the American Helicopter Society, Phoenix, Ariz., May 1991.
76. Wilbur, Matthew L.; Yeager, William T., Jr.; Singleton, Jeffrey D.; Mirick, Paul H.; and Wilkie, W. Keats: Wind-Tunnel Evaluation of the Effect of Blade Nonstructural Mass Distribution on Helicopter Fixed-System Loads. NASA TM-1998-206281, Jan. 1998.
77. Hardin, J. C.; and Lamkin, S. L.: Concepts for Reduction of Blade/Vortex Interaction Noise. Journal of Aircraft, Vol.24, No.2, Feb. 1987, pp. 120-125.
78. th Aeroacoustics Conference, AIAA-87-2744, Oct. 1987.
79. th European Rotorcraft Forum, Glasgow, U. K., Paper No.9.3, Sept. 1990.
80. Lowson, Martin Vincent; St. David, Barton; Hawkings, David Leonard; Byham, Geoffrey Malcolm; Perry, Frederick John; and Denham, Corton: Helicopter Rotor Blades. U. S. Pat. 4,077,741. Mar. 7, 1978.
81. White, R. W.: Developments in UK Rotor Blade Technology. AIAA Aircraft Design, Systems and Technology Meeting, Oct. 1983. (Available as AIAA-83-2525).
82. Wanstall, Brian: BERP Blades - Key to the 200 kn Helicopter. INTERAVIA, vol. 3, 1986, pp. 322 -324.
83. rd Annual Forum of the American Helicopter Society, May 1987, pp. 3-15.
84. Yeager, William T., Jr.; Noonan, Kevin W.; Singleton, Jeffrey D.; Wilbur, Matthew L.; and Mirick, Paul H.: Performance and Vibratory-Loads Data From a Wind-Tunnel Test of a Model Helicopter Main-Rotor Blade With a Paddle-Type Tip. NASA Technical Memorandum 4754, ARL Technical Report 1283, ATCOM Technical Report 97-A-006. May 1997.
85. th Annual Forum. Montreal, Quebec, Canada, May 25-27, 1999.
86. nd Annual Forum Proceedings, Vol. 2, Washington, D.C., June 4-6, 1996, pp. 1242-1252.
87. Wilkie, W. Keats; Belvin, W. Keith; and Park, K. C.: Aeroelastic Analysis of Helicopter Rotor Blades Incorporating Anisotropic Piezoelectric Twist Actuation. ASME 1996 World Congress and Exposition, Adaptive Structures Symposium, Proceedings, Aerospace Division. Nov. 1996.
88. Wilkie, W. Keats: Anisotropic Piezoelectric Twist Actuation of Helicopter Rotor Blades: Aeroelastic Analysis and Design Optimization. Ph. D. thesis, University of Colorado, Boulder, Colorado, 1997.
89. Wilkie, W. Keats; Park, K. C.; and Belvin, W. Keith: Helicopter Dynamic Stall Suppression Using Active Fiber Composite Rotor Blades. AIAA Paper No. 98-2002, presented at the AIAA/ASME/AHS Structures, Structural Dynamics, and Materials Conference, Long Beach, Calif., April 20-23, 1998.
90. th Annual International Symposium on Smart Structures and Materials, San Diego, Calif., March, 1998.
91. th Annual Forum, Montreal, Canada, May 25-27, 1999.
92. th Annual Forum, Montreal, Canada, May 25-27, 1999.
93. Johnson, Wayne: CAMRAD-II, Comprehensive Analytical Model of Rotorcraft Aerodynamics and Dynamics, Johnson Aeronautics, Palo Alto, Calif. 1994.
94. Taylor, Robert B.: Helicopter Blade Design for Minimum Vibration. NASA CR-3825, Oct. 1984.
95. He, C.: A Parametric Study of Harmonic Rotor Hub Loads. NASA CR-4558, Nov. 1993.
96. Bousman, William G.; and Mantay, Wayne R.: A Review of Research in Rotor Loads. Presented at NASA/Army Rotorcraft Technology Conference, Mar. 14-16, 1987, NASA - AMES Research Center.
97. Ormiston, Robert A.: Comparison of Several Methods for Predicting Loads on a Hypothetical Helicopter Rotor. Journal of the American Helicopter Society, Vol. 19, No. 4, Oct. 1974, pp. 2-13.
98. Blackwell, R. H., Jr.: Blade Design for Reduced Helicopter Vibration. Journal of the American Helicopter Society, Vol. 28, No. 3, July 1983, pp. 33-41.
99. Hansford, R. E.; and Vorwald, J.: Dynamics Workshop on Rotor Vibratory Loads Prediction. Journal of the American Helicopter Society, Vol. 43, No. 1, Jan. 1998, pp. 76-86.
100. Bingham, Gene J.; and Noonan, Kevin W.: Two-Dimensional Aerodynamic Characteristics of Three Rotorcraft Airfoils at Mach Numbers From 0.35 to 0.90. NASA TP-2000, AVRADCOM TR-82-B-2, 1982.
101. Noonan, Kevin W.: Aerodynamic Characteristics of Two Rotorcraft Airfoils Designed for Application in the In-board Region of a Main Rotor Blade. NASA TP-3009, AVSCOM TR-90-B-005, 1990.
102. th Annual Forum, Washington, DC, May 9-11, 2001.
103. Peters, D. A.; and Hohenemser, K. H.: Application of the Floquet Transition Matrix to Problems of Lifting Rotor Stability. Journal of the American Helicopter Society, Vol. 16, No. 2, April 1971, pp. 25-33.
104. Hammond, C. E.: An Application of Floquet Theory to Prediction of Mechanical Instability. AHS/NASA Ames Specialists' Meeting on Rotorcraft Dynamics, Moffett Field, CA, Feb. 13-15, 1974
105. (Also, J. Amer. Hel. Soc., Vol. 19, No. 4, Oct. 1974, pp. 14-23).
106. Hammond, C. E.: Helicopter Ground Resonance in Light of Army Requirements. Presented at the Ninth Army Science Conference, West Point, NY, June 18-21, 1974.
107. Coleman, R. P.; and Feingold, A. M.: Theory of Self-Excited Mechanical Oscillations of Helicopter Rotors With Hinged Blades. NACA Report 1351, 1958.
108. Bennett, R.L.: Digital Computer Program DF1758 Fully Coupled Natural Frequencies and Mode Shapes of a Helicopter Rotor Blade. NASA CR-132662, 1975.
109. McLarty, Tyce T.: Rotorcraft Flight Simulation With Coupled Rotor Aeroelastic Stability Analysis. Volume 1 - Engineers Manual. USAAMRDL-TR-76-41A, U.S. Army, May 1977. (Available from DDC as AD A042462.)
110. Weller, W. H.; and Minick, R. E.: An Improved Computational Procedure for Determining Helicopter Rotor Blade Natural Modes. NASA TM 78670, August 1978.
111. th Structures, Structural Dynamics and Materials Conference, Valley Forge, PA, May 5-7, 1976.
112. nd Annual Forum of the American Helicopter Society, Washington, DC, May 1976.
113. Kaza, K. R. V.; and Kvaternik, R. G.: Examination of the Flap-Lag Stability of Rigid Articulated Rotor Blades. Journal of Aircraft, Vol. 16, No. 12, December 1979, pp. 876-884.
114. Hohenemser, K. H.; and Yin, S-K: Some Applications of the Method of Multiblade Coordinates. Journal of the American Helicopter Society, Vol. 17, No. 3, July 1972, pp. 3-12.
115. Biggers, J. C.: Some Approximations to the Flapping Stability of Helicopter Rotors. AHS/NASA Ames Specialists' Meeting on Rotorcraft Dynamics, Moffett Field, CA, Feb. 13-15, 1974
116. (Proceedings available as Rotorcraft Dynamics, NASA SP-352, 1974).
117. Also, Journal of the American Helicopter Society, Vol. 19, No. 4, October 1974, pp. 24-33.
118. Friedmann, P.; Hammond, C. E.; and Woo, T-H: Efficient Numerical Treatment of Periodic Systems with Application to Stability Problems. International Journal for Numerical Methods in Engineering, Vol. 11, 1977, pp. 1117-1136.
119. Kaza, K. R. V.; and Kvaternik, R. G.: Nonlinear Flap-Lag-Axial Equations of a Rotating Beam. AIAA Journal, Vol. 15, No. 6, June 1977, pp. 871-874.
120. Kvaternik, R. G.; and Kaza, K. R. V.: Nonlinear Curvature Expressions for Combined Flapwise Bending Chordwise Bending, Torsion and Extension of Twisted Rotor Blades. NASA TM X-73997, December 1976.
121. Kaza, K. R. V.; and Kvaternik, R. G.: Nonlinear Aeroelastic Equations for Combined Flapwise Bending, Chordwise Bending, Torsion, and Extension of Twisted Nonuniform Rotor Blades in Forward Flight. NASA TM 74059, August 1977.
122. Novozhilov, V. V.: Foundations of the Nonlinear Theory of Elasticity. Graylock Press, Rochester, NY, 1953.
123. Vigneron, F. R.: Comment on Mathematical Modeling of Spinning Elastic Bodies for Modal Analysis. AIAA Journal, Vol. 13, January 1975, pp. 126-128.
124. Kaza, K. R. V.; and Kvaternik, R. G.: Aeroelastic Equations of Motion of a Darrieus Vertical-Axis Wind-Turbine Blade. DOE/NASA/1028-79/25 (NASA TM-79295), December 1979.
125. Kaza, K. R. V.: Nonlinear Aeroelastic Equations of Motion of Twisted, Nonuniform, Flexible Horizontal-Axis Wind Turbine Blades. DOE/NASA/3139-1 (NASA CR-159502), July 1980.
126. Kaza, K. R. V.; and Kvaternik, R. G.: Application of Unsteady Airfoil Theory to Rotary Wings. Journal of Aircraft, Vol. 18, No. 7, July 1981, pp. 604-605.
127. th Structures, Structural Dynamics and Materials Conference, Bethesda, MD, April 3-5, 1978 (AIAA Paper 78-491).
128. White, W. F., Jr.; Kvaternik, R. G.; and Kaza, K. R. V.: Buckling of Rotating Beams. Int. J. Mech. Sci., Vol. 21, 1979, pp. 739-745.
129. Lakin, W. D.: Integrating Matrices for Arbitrarily Spaced Grid Points. NASA CR-159172, November 1979.
130. Lakin, W. D.: Differentiating Matrices for Arbitrarily Spaced Grid Points. NASA CR 172556, January 1985
131. (also, Int. J. Numer. Meth. Engrg., Vol. 23, 1986, pp. 209-218).
132. Lakin, W. D.: Integrating Matrix Formulations for Vibrations of Rotating Beams Including the Effects of Concentrated Masses. NASA CR-165954, June 1982.
133. Lakin, W. D.; and Kvaternik, R. G.: An Integrating Matrix Formulation for Buckling of Rotating Beams Including the Effects of Concentrated Masses. Int. J. Mech. Sci., Vol. 31, No. 8, 1989, pp. 569-577.
134. Lakin, W. D.: Two-Dimensional Integrating Matrices on Rectangular Grids. NASA CR 165668, February 1981.
135. Lakin, W. D.: A Combined Integrating- and Differentiating-Matrix Formulation for Boundary-Value Problems on Rectangular Domains. Journal of Engineering Mathematics, Vol. 20, 1986, pp. 203-215.
136. Vakhitov, M. B.: Integrating Matrices as a Means of Numerical Solution of Differential Equations in Structural Mechanics. Izvestiya VUZ. Aviatsionnaya Teknika, Vol. 3, 1966, pp. 50-61.
137. Hunter, W. F.: Integrating-Matrix Method for Determining the Natural Vibration Characteristics of Propeller Blades. NASA TN D-6064, December 1970.
138. White, W. F., Jr.; and Malatino, R. E.: A Numerical Method for Determining the Natural Vibration Characteristics of Rotating Nonuniform Cantilever Blades. NASA TM X-72751, October 1975.
139. Hinnant, H. E.: Derivation of a Tapered p-Version Beam Finite Element. NASA TP 2931, 1989.
140. Hodges, R. V.; Nixon, M. W.; and Rehfield, L. W.: Comparison of Composite Rotor Blade Models: A Coupled-Beam Analysis and an MSC/NASTRAN Finite-Element Model. NASA TM 89024, 1987.
141. th Structures, Structural Dynamics and Materials Conference, Monterey, CA, April 1987.
142. Nixon, M. W.: Improvements to Tilt Rotor Performance Through Passive Blade Twist Control. NASA TM 100583 (AVSCOM TM-88-B-010), April 1988.
143. Nixon, M. W.: Analytical and Experimental Investigations of Extension-Twist-Coupled Structures. Master of Science Thesis, George Washington University, May 1989.
144. Nixon, M. W.; and Hinnant, H. E.: Dynamic Analysis of Pretwisted Elastically-Coupled Rotor Blades. Presented at the 1992 ASME Winter Annual Meeting, Anaheim, CA, November 8-13, 1992.
145. Lake, R. C.; and Nixon, M. W.: A Preliminary Investigation of Finite-Element Modeling for Composite Rotor Blades. NASA TM 100559 (USAAVSCOM TM 88-B-001), January 1988.
146. Lake, R. C.; Izadpanah, A. P.; and Baucom, R. M.: Experimental and Analytical Investigation of Dynamic Characteristics of Extension-Twist-Coupled Composite Tubular Spars. NASA TP 3225 (ARL TR 30), February 1993.
147. Lake, R. C.; Nixon, M. W.; Wilbur, M. L.; Singleton, J. D.; and Mirick, P. H.: A Demonstration of Passive Blade Twist Control Using Extension-Twist Coupling. NASA TM 107642 (USAAVSCOM TR 92-B-010), June 1992.
148. Lake, R. C.; Nixon, M. W.; Wilbur, M. L.; Singleton, J. D.; and Mirick, P. H.: Demonstration of an Elastically Coupled Twist Control Concept for Tilt Rotor Blade Application. AIAA Journal, Vol. 32, No. 7, July 1994, pp. 1549-1551.
149. Nixon, M. W.: Aeroelastic Response and Stability of Tiltrotors with Elastically-Coupled Composite Rotor Blades. Ph.D. Dissertation, 1993, University of Maryland, College Park, Maryland.
150. (A synopsis of this work may be found in: Parametric Studies for Tiltrotor Aeroelastic Stability in High Speed Flight. J. Amer. Hel. Soc., Vol. 38, Oct. 1993, pp. 71-79.)
151. Rehfield, L. W.: Design Analysis Methodology for Composite Rotor Blades. Proceedings of the Seventh DoD/NASA Conference on Fibrous Composites in Structural Design, AFWAL-TR-85-3094, June 1985.
152. Vanderplaats, G. N.: CONMIN - A FORTRAN Program for Constrained Function Minimization, User's Manual. NASA TM X-62282, August 1973.
153. th Structures, Structural Dynamics and Materials Conference, St. Louis, Mo. April 4-6, 1979, AIAA Paper 79-0730.
154. Murthy, V. R.; and Hammond, C.E.: Vibration Analysis of Rotor Blades with Pendulum Absorbers. Journal of Aircraft, Vol. 18, No. 1, Jan. 1981, pp. 23-29.
155. Pierce, G. A.; and Hamouda M-N. H.: Helicopter Vibration Suppression Using Simple Pendulum Absorbers on the Rotor Blade. NASA CR-3619, Sept. 1982.
156. Reichert, G.: Helicopter Vibration Control - A Survey. Sixth European Rotorcraft and Powered Lift Aircraft Forum, Bristol, UK, September 1980.
157. Amer, K. B.; and Neff, J.R.: Vertical-Plane Pendulum Absorbers for Minimizing Helicopter Vibratory Loads. Journal of American Helicopter Society, Vol. 19, Oct. 1974, pp. 44-48.
158. th Annual National Forum of the American Helicopter Society, May 1969.
159. st Annual National Forum of the American Helicopter Society, May 1975.
160. Taylor, R. B.; and Teare, P. A.: Helicopter Vibration Reduction with Pendulum Absorbers. Journal of the American Helicopter Society, Vol. 20, July 1975, pp. 9-17.
161. Houbolt, J. C.; and Brooks, G. W.: Differential Equations of Motion for Combined Flapwise Bending, Chordwise Bending and Torsion of Twisted Nonuniform Rotor Blades. NACA Report 1346, 1958.
162. Pestal, E. C.; and Leckie, F. A.: Matrix Methods in Elastomechanics. McGraw-Hill Book Co., 1963.
163. Kvaternik, R. G.; and Walton, W. C., Jr.: A Formulation of Rotor-Airframe Coupling for Design Analysis of Vibrations of Helicopter Airframes. NASA RP 1089, June 1982.
164. Advanced Rotorcraft Technology Task Force Report. Office of Aeronautics and Space Technology, NASA, October 15, 1978.
165. Gabel, R.; Ricks, R.; and Magiso, H: Planning, Creating, and Documenting a NASTRAN Finite Element Vibrations Model of a Modern Helicopter, Planning Report. NASA CR-165722, April 1981.
166. Gabel, R.; Kesack, W. J.; and Reed, D. A.: Planning, Creating, and Documenting a NASTRAN Finite Element Vibrations Model of a Modern Helicopter, Modeling Documentation Report. NASA CR-166077, March 1983.
167. Gabel, R.; and Reed, D. A.: Planning, Creating, and Documenting a NASTRAN Finite Element Vibrations Model of a Modern Helicopter, Test Requirements Report. NASA CR-165855, April 1982.
168. Gabel, R.; Reed, D. A.; and Ricks, R.: Planning, Creating, and Documenting a NASTRAN Finite Element Vibrations Model of a Modern Helicopter, Ground Shake Test - Results and Correlation Report. NASA CR-166107, May 1983.
169. Gabel, R.; Kesack, W. J.; Reed, D. A.; and Ricks, R.: Planning, Creating, and Documenting a NASTRAN Finite Element Vibrations Model of a Modern Helicopter, Summary Report. NASA CR-172229, October 1983.
170. nd Decennial Specialists' Meeting on Rotorcraft Dynamics, Moffett Field, CA, Nov. 7-9, 1984
171. (Proceedings available as Rotorcraft Dynamics 1984, NASA CP 2400, November 1985).
172. Dompka, R. V.; Sciascia, M. C.; Lindsay, D. R.; and Chung, Y. T.: Plan, Formulate, and Discuss a NASTRAN Finite Element Vibrations Model of the Bell ACAP Helicopter Airframe. NASA CR-181774, May 1989.
173. Dompka, R. V.; Hashish, E.; and Smith, M. R.: Ground Vibration Test Comparisons of a NASTRAN Finite Element Model of the Bell ACAP Helicopter Airframe. NASA CR-181775, May 1989.
174. Gabel, R.; Lang, P. F.; Smith, L. A.; and Reed, D. A.: Plan, Formulate, Discuss and Correlate a NASTRAN Finite Element Vibrations Model of the Boeing Model 360 Helicopter Airframe. NASA CR-181787, April 1989.
175. Reed, D. A.; and Gabel, R.: Ground Shake Test of the Boeing Model 360 Helicopter Airframe. NASA CR-181766, March 1989.
176. Christ, R.; Ferg, D.; Kilroy, K.; Toossi, M.; and Weisenburgcr, R.: Plan, Formulate and Discuss a NASTRAN Finite Element Model of the AH-64A Helicopter Airframe. NASA CR-187446, October 1990.
177. Ferg, D.; Foote, L.; Korkosz, G.; Straub, F.; Toossi, M.; and Weisenburger, R.: Plan, Execute, and Discuss Vibration Measurements and Correlations to Evaluate a NASTRAN Finite Element Model of the AH-64A Helicopter Airframe. NASA CR-181973, January 1990.
178. Dinyovszky, P.; and Twomey, W. J.: Plan, Formulate, and Discuss a NASTRAN Finite Element Model of the UH-60A Helicopter Airframe. NASA CR-181975, February 1990.
179. Howland, G. R.; Durno, J. A.; and Twomey, W. J.: Ground Shake Test of the UH-60A Helicopter Airframe and Comparison with NASTRAN Finite Element Model Predictions. NASA CR-181993, March 1990.
180. Stebbins, R. F.; and Twomey, W, J.: Plan, Formulate, and Discuss a NASTRAN Finite Element Model of the Sikorsky ACAP Helicopter Airframe. NASA CR-182059, June 1990.
181. Ferg, D.; and Toossi, M.: Finite Element Modeling of the Higher Harmonic Controlled OH-6A Helicopter Airframe. NASA CR-187449, October 1990.
182. Hashemi-Kia, M.; Kilroy, K.; and Parker, G.: Development and Applications of a Multi-Level Strain Energy Method for Detecting Finite Element Modeling Errors. NASA CR-187447, October 1990.
183. Bielawa, R. L.; Hefner, R. E.; and Castagna, A.: Static Strain and Vibration Characteristics of a Metal Semimonocoque Helicopter Tail Cone of Moderate Size. NASA CR-187576, June 1991.
184. Hashemi-Kia, M.; and Toossi, M.: Development and Application of a Technique for Reducing Airframe Finite Element Models for Dynamics Analysis. NASA CR-187448, October 1990.
185. Dompka, R. V.: Investigation of Difficult Component Effects on Finite Element Model Vibration Prediction for the Bell AH-1G Helicopter. Volume I - Ground Vibration Test Results. Volume II - Correlation Results. NASA CR-181916, October 1989
186. (A summary of this work may be found in Journal of the American Helicopter Society, Vol. 35, No. 1, Jan. 1990, pp. 64-74).
187. th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 6-8, 1991, pp. 1009-1028.
188. Dompka, R. V.: Investigation of Difficult Component Effects on Finite Element Model Vibration Prediction for the Bell ACAP Helicopter. NASA CR-187493, February 1991.
189. Cronkhite, J. D.; Berry, V. L.; and Brunken, J. E.: A NASTRAN Vibration Model of the AH-1G Helicopter Airframe. U. S. Army Armament Command Report No. R-TR-74-045, June 1974.
190. Cronkhite, J. D.; Berry, V. L.; and Dompka, R. V.: Summary of the Modeling and Test Correlations of a NASTRAN Finite Element Vibrations Model for the AH-1G Helicopter. NASA CR-178201, January 1987.
191. Dompka, R. V.; and Cronkhite, J. D.: Summary of AH-1G Flight Vibration Data for Validation of Coupled Rotor-Fuselage Analyses. NASA CR-178160, November 1986.
192. Cronkhite, J. D.; Dompka, R. V.; Rogers, J. P.; Corrigan, J. C.; Perry, K. S.; and Sadler, S. G.: Coupled Rotor/Fuselage Dynamic Analysis of the AH-1G Helicopter and Correlation with Flight Vibrations Data. NASA CR-181723, January 1989.
193. DiTaranto, R. A.; and Sankewitsch, V.: Calculation of Flight Vibration Levels of the AH-1G Helicopter and Correlation with Existing Flight Vibration Measurements. NASA CR-181923, November 1989.
194. Sangha, K.; and Shamie, J.: Correlation of AH-1G Airframe Flight Vibration Data with a Coupled Rotor-Fuselage Analysis. NASA CR-181974, August 1990.
195. Sopher, R.; and Twomey, W. J.: Calculation of Flight Vibration Levels of the AH-1G Helicopter and Correlation with Existing Flight Vibration Measurements. NASA CR-182031, April 1990.
196. Bauchau, O. A.; and Kang, N. K.: Nonlinear Dynamic Analysis of Flexible Multibody Systems. NASA CR-187597, July 1991.
197. nd Structures, Structural Dynamics, and Materials Conference, Baltimore, MD, April 8-10, 1991 (Paper AIAA-91-1260-CP).
198. Kvaternik, R. G.: The NASA/Industry Design Analysis Methods for Vibrations (DAMVIBS) Program - Accomplishments and Contributions. Presented at the AHS National Technical Specialists' Meeting on Rotorcraft Structures, Williamsburg, VA, October 29-31, 1991. (Also available as NASA TM 104192, December 1991).
199. Kvaternik, R. G.: The NASA/Industry Design Analysis Methods for Vibrations (DAMVIBS) Program - A Government Overview. NASA TM 107579, April 1992.
200. Kvaternik, R. G.: DAMVIBS Looks at Rotorcraft Vibrations. Aerospace America, September 1992, pp. 22-24.
201. rd Structures, Structural Dynamics and Materials Conference, April 13-15, 1992, Dallas, TX (Session papers also available as NASA CP 10114, January 1993).
202. Murthy, T. S.: Design Sensitivity Analysis of Rotorcraft Airframe Structures for Vibration Reduction. NASA/VPISU Symposium on Sensitivity Analysis in Engineering, Langley Research Center, Sept. 25-26, 1986
203. (Proceedings available as: Sensitivity Analysis in Engineering. NASA CP 2457, Sept. 1987).
204. Murthy, T. S.: Optimization of Helicopter Airframe Structures for Vibration Reduction - Considerations, Formulations and Applications. AIAA Aircraft Design, Systems and Operations Meeting, September 7-9, Atlanta, GA, 1988
205. (also, J. of Aircraft, Vol. 28, No. 1, January 1991, pp. 66-73).
206. th Annual Forum of the American Helicopter Society, Phoenix, AZ, May 6-8, 1991.
207. Murthy, T. S.; and Kvaternik, R. G.: Experiences at Langley Research Center in the Application of Optimization Techniques to Helicopter Airframes for Vibration Reduction. Presented at the AHS National Technical Specialists' Meeting on Rotorcraft Structures, Williamsburg, VA, October 29-31, 1991. (Also available as NASA TM 104193, December 1991).
208. Murthy, T. S.: Investigation on the Use of Optimization Techniques for Helicopter Airframe Vibrations Design Studies. In Leondis, C. T. (editor): Control and Dynamic System, Volume 54: System Performance Improvement and Optimization Techniques and Their Applications in Aerospace Systems, Academic Press, San Diego, CA, 1992.
209. Kvaternik, R. G.; and Murthy, T. S.: Airframe Structural Dynamic Considerations in Rotor Design Optimization. NASA TM 101646, August 1989.
210. MSC/NASTRAN (Version 65) User's Manual, Volumes I and II. The MacNeal-Schwendler Corporation, 1985.
211. Hanson, H. W.: Investigation of Vibration Reduction Through Structural Optimization. USAAVRADCOM-TR-80-D-13, July 1980.
212. Young, M. I.: On Passive Spot Damping Anomalies. Proceedings of Damping '89, WRDC-TR-89-3116, Vol. I, pp. DCB 1-14 (Conference sponsored by the Air Force Flight Dynamics Laboratory and held in West Palm Beach, Fl, Feb. 8-10, 1989).
213. Young, M. I.: Spot Damping Anomalies. Journal of Sound and Vibration, 1989, Vol. 131, No. 1, pp. 160-163.
214. Young, M. I.: On Lightly Damped Linear Systems. Journal of Sound and Vibration, 1990, Vol. 139, No. 3, pp. 515-518.
215. Young, M. I.: On Dynamic Stability Boundaries for Binary Systems. Journal of Sound and Vibration, 1990, Vol. 136, No. 3, pp. 520-524.
216. Young, M. I.: Structural Dynamics and Vibrations of Damped, Aircraft-Type Structures. NASA CR 4424, February 1992.
217. Berman, A.; Chen, S-Y.; Gustavson, B.; and Hurst, P.: Dynamic System Coupler Program (DYSCO 4.1). Volume 1 - Theoretical Manual. USAAVSCOM TR-88-D-14A, January 1989.
218. Wilbur, M. L.: Development of a Rotor/Body Coupled Analysis for an Active-Mount, Aeroelastic Rotor Testbed. Master of Science Thesis, George Washington University, 1996.
219. CAMRAD-II Theory. Version 1.2. Volumes 1-3, Johnson Aeronautics, Palo Alto, CA, 1994.
220. Dynamic Analysis and Design System Reference Manual. Revision 7.5. Volumes 1 and 2, CADSI, Coralville, Iowa. 1993.
221. Haug, E. J.: Computer Aided Kinematics and Dynamics of Mechanical Systems. Volume 1: Basic Methods. Allyn and Bacon, Boston, 1989.
222. du Plessis, A.; and Hagood, N.: Performance Investigation of Twist Actuated Single Cell Composite Beams for Helicopter Blade Control. Sixth International Conference on Adaptive Structures Technology, Key West, Florida, Nov. 13-15, 1995.
223. Peters, D. A.: Toward a Unified Lift Model For Use in Rotor Blade Stability Analyses. Journal of the American Helicopter Society, Vol. 30, No.3, July 1985, pp. 32-42.
224. Petot, D.: Differential Equation Modeling of Dynamic Stall. Recherche Aerospatiale, Vol. 5, No. 5, 1989.
225. Peters, D. A.; Chouchane, M.; and Fulton, M.: Helicopter Trim with Flap-Lag-Torsion and Stall by an Optimized Controller. Journal of Guidance, Control and Dynamics, Vol. 13, No. 5, Sept.-Oct., 1990, pp. 824-834.
226. MATLAB Reference Guide, The MathWorks, Inc., 1992.
227. Abbott, F. T., Jr.; Kelly, H. N.; and Hampton, K. D.: Investigation of 1/8-Size Dynamic-Aeroelastic Model of the Lockheed Electro Airplane in the Langley Transonic Dynamics tunnel. NASA TM SX-456, November 1960.
228. (Also published as: Investigation of Propeller-Power-Plant Antoprecession Boundaries for a Dynamic-Aeroelastic Model of a Four-Engine Turboprop Transport Airplane. NASA TN D-1806, August 1963).
229. Bennett, R. M.; Kelly, H. N.; and Gurley, J. R., Jr.: Investigation in the Langley Transonic Dynamics Tunnel of a 1/8-Size Aeroelastic-Dynamic Model of the Lockheed Electro Airplane with Modifications in the Wing-Nacelle Region. NASA TM SX-818, March 1963.
230. Reed, W. H., III; and Bland, S. R.: An Analytical Treatment of Aircraft Propeller Precession Instability. NASA TN D-659, November 1960.
231. Houbolt, J. C.; and Reed, W. H., III: Propeller-Nacelle Whirl Flutter. J. Aeronautical Sci., March 1962, pp. 333-345.
232. Bland, S. R.; and Bennett, R. M.: Wind-Tunnel Measurements of Propeller Whirl-Flutter Speeds and Static-Stability Derivatives and Comparison with Theory. NASA TN D-1807, August 1963.
233. Bennett, R. M.; and Bland, S. R.: Experimental and Analytical Investigation of Propeller Whirl Flutter of a Power Plant on a Flexible Wing. NASA TN D-2399, August 1964.
234. Reed, W. H., III; and Bennett, R. M.: Propeller Whirl Considerations for V/STOL Aircraft. CAL/TRECOM Symposium Proceedings: Vol. II - Dynamic Load Problems Associated with Helicopters and V/STOL Aircraft, June 1963.
235. Richardson, J. R.; and Naylor, H. F. W.: Whirl flutter of Propellers with Hinged Blades. Report No. 24, Engineering Research Associates, Toronto, Canada, March 1962.
236. Reed, W. H., III: Review of Propeller-Rotor Whirl Flutter. NASA TR R-264, July 1967.
237. Rainey, A. G.: Aeroelastic Considerations for Transports of the Future - Subsonic, Supersonic, and Hypersonic. Presented at the AIAA Aircraft Design for 1980 Operations Meeting, Washington, D.C., Feb. 12-14, 1968.
238. Kvaternik, R. G.: Studies in Tilt-Rotor VTOL Aircraft Aeroelasticity. Ph.D. Dissertation, June 1973, Case-Western Reserve University, Cleveland, Ohio.
239. Singleton, J. D.: Coupled Rotor-Fuselage Aeroelastic Analysis for Tiltrotor Configurations. Eighth ARO Workshop on Aeroelasticity of Rotorcrafi Systems, October 18-20, 1999, State College, PA.
240. Wang, J. M.; Torok, M. S.; and Nixon, M. W.: Experimental and Theoretical Study of Variable Diameter Tilt Rotor Dynamics. Presented at the AHS Vertical Lift Aircraft Design Conference, San Francisco, CA, January 18-20, 1995.
241. th Annual Forum of the American Helicopter Society, Montreal, Canada, May 25-27, 1999.
242. th Annual Forum of the American Helicopter Society, Montreal, Canada, May 25-27,1999.
243. Ghiringhelli, G. L.; Masarati, P.; Mantegazza, P.; and Nixon, M. W.: Multi-Body Analysis of an Active Control for a Tiltrotor. CEAS/AIAA/ICASE/NASA Langley Forum on Aeroelasticity and Structural Dynamics 1999. NASA CP-1999-209136/PT 1, June 1999.
244. Ghiringhelli, G. L.; Masarati, P.; Mantegazza, P.; and Nixon, M. W.: Multi-Body Analysis of a Tiltrotor Configuration. Nonlinear Dynamics, Vol. 19, 1999, pp. 333-357.
245. 3) on Rotor Blade Motion Stability and Flapping. Journal of the American Helicopter Society, Vol. 14, No. 2, April 1969, pp.49-67.
246. Gaffey, T. M.; Yen, J. G.; and Kvaternik, R. G.: Analysis and Model Tests of the Proprotor Dynamics of a Tilt-Proprotor VTOL Aircraft. Presented at the Air Force V/STOL Technology and Planning Conference, Las Vegas, NV, September 23-25, 1969.
247. Kvaternik, R. G.: Experimental and Analytical Studies in Tiltrotor Aeroelasticity. AHS/NASA Ames Specialists' Meeting on Rotorcraft Dynamics, Moffett Field, CA, Feb. 13-15, 1974
248. (Proceedings available as Rotorcraft Dynamics, NAS ASP-352, 1974).
249. Yen, J. G.; Weber, G. E.; and Gaffey, T. M.: A Study of Folding Proprotor VTOL Aircraft Dynamics. AFFDL-TR-71-7 (Vol. I), September 1971.
250. Marr, R. L.; and Neal, G. T.: Assessment of Model Testing of a Tilt-Proprotor VTOL Aircraft. Presented at the AHS Mid-East Region Symposium on the Status of Testing and Modeling Techniques for V/STOL Aircraft, Essington, PA, Oct. 26-28, 1972.
251. Baird, E. F.; Bauer, E. M.; and Kohn, J. S.: Model Tests and Analysis of Prop-Rotor Dynamics for Tilt-Rotor Aircraft. Presented at the AHS Mid-East Region Symposium on the Status of Testing and Modeling Techniques for V/STOL Aircraft, Essington, PA, Oct. 26-28, 1972.
252. Kvaternik, R. G.; and Kohn, J. S: An Experimental and Analytical Investigation of Proprotor Whirl Flutter. NASA TP 1047, December 1977.
253. th Aircraft Design, Flight Test, and Operations Meeting, Los Angeles, CA, August 7-9, 1972.
254. st Annual Forum of the American Helicopter Society, Fort Worth, TX, May 15-17, 1985.
255. (Also, J. Amer. Hel. Soc., Vol. 32, No. 2, April 1987, pp. 21-33).
256. Settle, T. B.; and Kidd, D. L.: Evolution and Test History of the V-22 0.2-Scale Aeroelastic Model. Journal of the American Helicopter Society, Vol. 37, No. 1, January 1992, pp. 31-45.
257. rd Annual Forum of the American Helicopter Society, Virginia Beach, VA, April 29-May 1, 1997.
258. st Annual Forum of the American Helicopter Society, Fort Worth, TX, May 9-11, 1995.
259. rd Annual Forum of the American Helicopter Society, Virginia Beach, VA, April 29-May 1, 1997.
260. th Annual National Forum of the American Helicopter Society, Montreal, Canada, May 25-27, 1999.
261. rd Annual Forum of the American Helicopter Society, Virginia Beach, VA, April 29-May 1, 1997.
262. (Also: Journal of the American Helicopter Society, July 1998, pp. 235-245).
263. Kvaternik, R. G.; Juang, J-N.; and Bennett, R. L: Exploratory Studies in Generalized Predictive Control for Active Aeroelastic Control of Tiltrotor Aircraft. AHS Northeast Region Active Controls Technology Conference, Bridgeport, CT, October 4-5, 2000.
264. Juang, J.-N., Applied System Identification, Prentice Hall, Inc., Englewood Cliffs, New Jersey, 1994.
265. Phan, M. Q.; and Juang, J-N: Predictive Feedback Controllers for Stabilization of Linear Multivariable Systems. AIAA Guidance, Navigation and Control Conference, San Diego, CA, July 29-31, 1996.
266. Juang, J.-N.: State-Space System Realization With Input- and Output-Data Correlation. NASA TP 3622, April 1997.
267. Juang, J-N; and Phan, M. Q.: Deadbeat Predictive Controllers. NASA TM 112862, May 1997.
268. Eure, K. W.: Adaptive Predictive Feedback Techniques for Vibration Control. Ph.D. Dissertation, Virginia Polytechnic Institute and State University, May 1998.
269. Phan, M. Q.; and Juang, J.-N.: Predictive Controllers for Feedback Stabilization. Journal of Guidance, Control, and Dynamics, Vol. 21, No. 5, Sept.-Oct. 1998, pp. 747-753.
270. Juang, J-N; and Eure, K. W.: Predictive Feedback and Feedforward Control for Systems with Unknown Disturbances. NASA TM-1998-208744, December 1998.
271. nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, Seattle, WA, April 16-19, 2001.
272. th Annual Forum of the American Helicopter Society, Washington, DC, May 9-11, 2001.
273. th Annual Forum of the American Helicopter Society, Washington, DC, May 9-11, 2001.
274. Nixon, M. W.; Langston, C. W.; Singleton, J. D.; Piatak, D. J.; Kvaternik, R. G.; Corso, L. M.; and Brown, R. K.: Experimental Investigations of Generalized Predictive Control for Tiltrotor Stability Augmentation. 2001 CEAS/AIAA/AIAE International Forum of Aeroelasticity and Structural Dynamics, Madrid, Spain, June 5-7, 2001.