包装系统的动态响应与模态参数识别方法

The Dynamic Response and the Modal Parameters Identification in Packaging System

考虑到产品结构的复杂性及缓冲材料特性的复杂性,将包装件模型建为多模态系统,建立了一种根据系统自由响应加速度数据识别系统各模态参数的方法。首先利用改进的Prony方法识别出系统的模态数,并初步识别系统自由响应的零点及留数,并以此识别结果为迭代起点,推导出了利用结构化非线性最小范数法对自由响应数据的零点与留数进行优化的迭代方法。对蜂窝纸板-质量系统进行冲击激励实验,并记录下该系统自由响应数据,模拟结果表明,所提出的参数识别方法具有良好的精确性。

In considering the complexity of the product structure as well as of cushion material properties, the package model should be constructed as the multiple model system. A modal parameters identification method is formulated using the free response acceleration data of the packaging system. The modified Prony method is firstly used to identify the number of the order of the system modal. And then, the zeros and residues of the system free response are initially identified, and the identified results are set as the starting point of the iteration, an optimal algorithm is derived by means of the structured nonlinear total least norm method so that the optimal system response zeros and residues are obtained. A shock excitation is exerted on a paper honeycomb panel-mass system, and the free response acceleration data are recorded. The simulation results indicate that the parameters identification method suggested in this paper is of good accuracy.