随机激励下无人机起落架结构的动力响应分析

Dynamic Response Analysis of UAV's Landing Gear Structure Subjected to Random Excitation

研究无人机在复杂环境下起降的问题,由于在不平整跑道上进行起落,无人机起落架结构在随机激励下承受非平稳载荷动力响应。依据机场跑道功率谱密度,推导出无人机在不同等级跑道上滑行时起落架承受的非平稳随机激励。建立无人机起落架的数学模型,给出起落架结构的动力方程。结合推导出的非平稳随机激励,并采用虚拟激励法,计算起落架结构的动力响应。仿真结果表明,在不同速度、不同等级跑道的情况下,计算得出起落架结构位移响应的功率谱密度和标准差,可为无人机起落架结构优化设计提供依据。

Researching the problem of unmanned aerial vehicle （UAV） take -off and landing under complex environment. Based on the power spectral density of airport runway, the paper derived the non - stationary random exci- tations when the unmanned aerial vehicle taxied in different airport runway. To establish the mathematical model of a UAN＇s landing gear, a landing gear structure dynamic equation was given. To take the non - stationary random exci- tations into consideration and to adopt the pseudo - excitation method, the dynamic response analysis of a landing gear structure was analyzed. By an example, under the conditions of considering different speeds and different grades runway, displacement response power spectral density and standard deviation of the landing gear structure were calcu- lated, which can provide the basis for optimization design of UAV landing gear structure.