Prediction And Alleviation Of V-22 Rotor Dynamic Loads

The methodology used to develop the oscillatory rotor design loads for the V-22 is presented. Discussion of the design loads centers on three areas: rotor tuning, loads prediction methods, and loads alleviation techniques. The rotor design configuration and evolution of the frequency placement relative to the design constraints is described. The analytical methods and math model refinements developed to compute the oscillatory loads are discussed. Oscillatory loads are shown to be alleviated through the use of flight control laws that reduce the severity of the loading conditions without compromising the handling qualities or usable maneuvering capability.