Aeroelastic stability is a key issue that drives the design of modern rotorcraft. The robustness of stability analysis is fundamental to determine the amount of freedom a designer has in defining the key properties in specific rotorcraft problems dominated by stability. The paper presents an effective technique to investigate the effect of nonlinearities on the ground resonance stability, resorting to the multi input describing function. In this way it is possible to investigate the cases when multiple harmonics are injected into a nonlinear component, a typical condition for rotorcraft components. To show the potential of the method, an application that considers a nonlinear model for hydraulic lead-lag dampers is presented.
Multiple Input Describing Function for Non-Linear Analysis of Ground and Air Resonance
MUSCARELLO, VINCENZO;QUARANTA, GIUSEPPE
2011-01-01
Abstract
Aeroelastic stability is a key issue that drives the design of modern rotorcraft. The robustness of stability analysis is fundamental to determine the amount of freedom a designer has in defining the key properties in specific rotorcraft problems dominated by stability. The paper presents an effective technique to investigate the effect of nonlinearities on the ground resonance stability, resorting to the multi input describing function. In this way it is possible to investigate the cases when multiple harmonics are injected into a nonlinear component, a typical condition for rotorcraft components. To show the potential of the method, an application that considers a nonlinear model for hydraulic lead-lag dampers is presented.File | Dimensione | Formato | |
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