用模态参数和振动试验数据修正动力学环境模型的研究

文章提出了一种利用模态参数和由振动试验数据求得的频响函数来进行模型修正的方法.在已建立的初步动力学模型的基础上,首先用实测的模态参数对解析模型进行修正,然后再用实测的频响函数修正解析模型的动力学参数,以使修正后的动力学模型中的模态参数和加速度频响函数与实际测量值一致.文章给出了这种方法的数学原理和公式,并通过一个数值模拟实例分析并验证了修正后模型的精确性.

A study on using modal parameters and vibration test data to update dynamic model

This paper presents a synthesized model updating method using the modal parameters and frequency response functions(FRF) extracted from the vibration test data. Based on an established preliminary dynamic model, this method first updates the analytical model by use of the measured modal parameters, and then updates the dynamic characteristics of the analytical model with the measured frequency response functions in order that the modal parameters and FRF acceleration obtained by the updated dynamic model agree well with those measured. The detailed mathematical theory and formulation of this method are presented in the paper. The validation and accuracy of this method is analyzed and discussed through a numerical example.