飞机地面变速滑跑演变随机响应分析

通过演变谱分析法对飞机起落架地面变速滑跑进行动响应分析.飞机在机场跑道变速滑行时,机场跑道基础激励将转化为非平稳随机激励,从而导致非平稳随机响应分析.采用演变随机激励表示该非平稳随机激励,用原平稳随机激励的功率谱密度和非线性变换表示其时变相关特性.利用演变谱法分析起落架系统的非平稳响应问题,最后通过数值算例验证了该方法的简便性和优越性.

Evolutionary Random Response Analysis for Aircraft Taxiing at Variable Velocity on Unevenness Runway

In this paper,the non-stationary response problem of aircraft landing gear taxiing over an unevenness runway at variable velocity is studied by a so called evolutionary spectrum method.As an aircraft gliding on a runway of an airport,the foundation excitation of the runway is transformed to non-stationary random excitation,for the variable velocity of the aircraft.Fortunately,such kind of non-stationary random excitation can be represented as an evolutionary random excitation.The time varied correlation of this non-stationary random excitation can be expressed in a power spectral density of a stationary one and a nonlinear transformation.So the evolutionary spectrum method can be applied to analyze the non-stationary random response of the landing gear system.Numerical examples show that the suggested methods are effective.