Helicopter Ground Resonance Analysis in Light of Army Requirements
ARMY AIR MOBILITY RESEARCH AND DEVELOPMENT LAB HAMPTON VA LANGLEY DIRECTORATE
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The Army has in recent years refined its methods of procuring aircraft. Until recently the Army had only procured aircraft which were more or less off-the-shelf items. That is, the aircraft were either developed for other military services or for civilian use and were adapted to meet Army needs. As a result, the Army was not significantly involved in the writing of specifications which affected the overall design of the vehicle. Operational experience has indicated, however, the need for specifications which reflect the particular requirements of Army aviation. This paper is concerned with requirements which have been imposed in the area of helicopter mechanical instability, or ground resonance as this phenomenon is commonly known, and the impact which these requirements have on the analyst.