Analysis on Ground Resonance of Skid Helicopter Based on Fuselage Equivalent
A ground resonance analysis method use planar model with fuselage equivalent parameters based on finite ele-ment is put forward for the problem of inconvenient to adopt spatial model to analyzed ground resonance,and the equiva-lent parameters can be verified by excitation experiment.The ground resonance simulation analysis of the skid helicopter is carried out using the equivalent parameters.The results show that:the resonance speed of the first order mode of fuse-lage coupled with the regressive lag mode of rotor would reach during rotor acceleration,but it has sufficient damping to avoid ground resonance;it would not cause ground resonance because of the resonance speed of the above second order mode of fuselage coupled with the regressive lag mode of rotor is much larger than the rated speed of rotor.
国家科技期刊平台
NSTL
万方数据
维普
