混合传递路径分析方法

根据悬臂壳实验台结构建立有限元模型,并结合实验模态分析对其进行修正,建立高精度有限元模型。利用实验模态分析结果计算结构阻尼参数,确立混合传递路径分析(TPA)中频率响应函数(FRF)的有限元计算方法,并且与实验结果对比,验证其有效性和可行性。利用Tikhonov正则化方法进行载荷识别,对悬臂壳实验台进行混合TPA实验研究,获得不同频率下各路径对目标点振动的贡献量,并将各路径对目标点的振动贡献量进行矢量叠加,与实验测试值进行对比。结果表明,各路径贡献量叠加结果与实验测试值吻合较好,可确定该结构的主要振动传递路径,从而为结构优化奠定基础。

The Method for Mixed Transfer Path Analysis

According to the structure of the cantilever shell, the finite element model was established . To obtain a high-precision finite element model, the finite element model was corrected through the modal test. The structural damped parameters were calculated using the results of the modal test. Then the method of acquiring frequency response functions based on finite element method was determined, and the effectiveness and the feasibility of the method were verified by the modal test. The transfer path analysis of the cantilever shell was finished by the mixed transfer path analysis method, and the contributions of every transfer path to the vibration of the target points were confirmed under different frequencies. Then the contributions of every transfer path were added together, and the result was compared with the measured signals. The results showed that the superimposed results were well suited for the measured signals and the transfer paths of vibration were determined. This study has provided the basis for the structural optimization.