试验模态分析所得振型和仿真所得振型怎么对比？

lichunyang

由于自由度不一致，大家都是怎么处理的？

sunhaolan

缩减仿真系统的矩阵，或者扩展实验数据的自由度。由专门的扩展和压缩技术。

kevinsuper

I still remember there is a MAC(Modal Assurance Criteria) which helps you to compare the modal shape between experimental and theoratical( FEM,BEM,whatever)data. The philosophy of this technique is pretty similar with the coherence function in digital signal process. Most of the modal analysis software (like LMS-Modal analysis, Me'scope i used) provides this technique to help you guys compare those data.

mxlzhenzhu

MAC矩阵的计算可不是那么简单的，文绉绉的做法是，要修正刚体模态，避免振型混叠；要对没有Map的振型进行修正，比如用得比较多的基于SEREP缩聚算法的振型恢复，这是技术活。