Abstract
Over the 40-year evolution of the helicopter, man's understanding of vibration control techniques has greatly increased. However, with the performance of helicopters also increasing, the extent of their vibration problems has not diminished. Crew vibration therefore remains a significant factor in the design of all current helicopters. With more complex and critical demands being placed on aircrews it becomes more important that vibration should not impair their performance. Thus, as man's greater understanding of vibration control techniques provides the ability to constrain the vibration the definition of appropriate vibration limits becomes both more necessary and more useful.

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