搜索算法对有效独立法优化振动模态测量位置的影响

Influence of search algorithm on optimized measurement positions of effective independent method for modal test

讨论了直接法、逐步累积法和逐步消除法三种不同搜索算法对有效独立法选取最优传感器测量位置的影响.以航空发动机某部件为实例,对有效独立法通过三种搜索算法选取的最优传感器测量位置的搜索结果,在模态相关度、测量点各阶能量和Fisher信息矩阵三个参数方面进行了分析、比较,结果表明逐步消除法能最有效地达到有效独立法的增大目标振型空间分辨率的效果.

The influences of three different search algorithms, i.e. direct search method, step accumulating method and step eliminating method, on the effective independent method were discussed with respect to the optimized measurement positions for modal test. An aero-engine component was taken as an example to demonstrate the application of the approach. The optimized measurement positions selected by these three search algorithms for the effective independent method were analyzed comparatively with respect to modal correlation, kinetic energy of each mode contributed to the measured positions and the Fisher information matrix. The results indicate that the step eliminating method can most effectively achieve the goal of the effective independent method by increasing the spatial resolution of the target mode shapes