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在对结构特性进行论证与分析时,我们通常要对其做动态特性试验,所用方法中较为成熟和简便的就是频响函数法,这种方法一般需要施加人工激励,这和结构实际工作过程中的激励源有所不同。为了能够更加真实地了解机械系统在工作状态下的结构特性信息,文章探讨了一种时域识别方法 -EAR法,并对某型机部件的飞行数据进行分析。试验结果表明,应用ERA算法对直升机飞行状态下的结构进行试验模态参数识别,取得了良好的效果,具有工程使用价值。
In the structural characteristics of the demonstration and analysis, we usually have to do the dynamic characteristics of the test, the method used is more mature and easy is the frequency response function method, this method generally requires the imposition of artificial incentives, and the structure of the actual work process The motivation is different. In order to get a more realistic understanding of the structural characteristics of the mechanical system under working conditions, this paper discusses a method of time domain identification -EAR method and analyzes the flight data of a type of aircraft. The experimental results show that the ERA algorithm is used to identify the modal parameters of the helicopter under flight conditions and has achieved good results and has the value of engineering application.