The importance of nonlinearity on the higher harmonic control of helicopter vibrationThe effect of nonlinearity on the higher harmonic control (HHC) of helicopter vibration is investigated using a nonlinear aeroelastic simulation. A nonlinear solution is proposed which relates the HHC inputs to vibration outputs on the basis of a Volterra functional series. The Volterra series solution is shown to reduce to a vector polynomial equation relating HHC inputs to vibration outputs at any harmonic frequency. The nonlinear transfer relationship is identified from a nonlinear vibration analysis computer program, and the identification model is examined in detail. Improvements to current HHC algorithms are presented, and several Kalman filter divergence problems are quantified.
Document ID
19840063590
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Molusis, J. A. (Connecticut, University Storrs, CT, United States)