基于飞行工作模态分析的飞行器动载荷识别研究

摘要

基于飞行遥测振动数据,本文提出了基于工作模态分析的飞行器动载荷识别方法.首先,详细介绍了ERA环境激励模态辨识方法的理论.其次,给出了飞行器结构动力学建模方法.再次,提出了基于工作模态辨识的飞行器动载荷辨识计算工作流程,详细分析了其中的注意点.最后,通过算例验证了方法的可行性,其中基于飞行器飞行振动遥测数据,采用环境激励模态辨识方法辨识其各时刻的模态,包括模态频率和模态振型,再利用振动响应的模态叠加原理和模态正交理论,获取各时刻飞行器低阶模态的响应,再结合模态剪力和模态弯矩进行动载荷识别.%Based on the operational mode analysis of the aircraft and fighting vibration data,the dynamic load identification technology is investigated in this paper.Firstly,the theory of the ERA method is introduced.Secondly,the dynamic model of the aircraft is put forward.Thirdly,the strategy for implementation is put forward,where the notices are analyzed in detail.Eventually,an example case is studied,where the operational modes are identified based on the telemetry data including the mode frequency and shape.The mode response are then obtained by mode superposition method and mode orthogonal theory,before the dynamic load is derived.