PILOT STUDY OF RESPONSE OF CV-2 AIRCRAFT TO IRREGULAR TERRAIN.
Final rept. Sep-Oct 65,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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The investigation reported herein was a pilot study undertaken to develop means of predicting the performance of a CV-2 aircraft on irregular terrain and of quantifying surface roughness. Special tests were conducted to ascertain the natural frequency and damping characteristics in both the vertical and horizontal directions of the elements of the aircraft. Landing, takeoff, and taxi tests were conducted at 15 field sites in three general areas accelerometers and strain gages were used to record responses of 12 critical components of the aircraft. Simple mathematical models to predict the dynamic responses of certain of the aircraft components were developed for solution by both analog and digital computers and were verified by comparison with measured data. Because of certain assumptions used in the development of the models, the predicted data did not agree exactly with the actual data. Although the predictions were of useful accuracy, it is recommended that an analog model, excited by measured terrain data, be used to determine the adequacy of a surface for landings of the CV-2 aircraft. To obtain the terrain input, an outrigger trailer dynamometer with an actual prototype aircraft tire as the terrain follower is proposed. Author
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