基于频响函数曲率差的弹簧质量系统损伤识别与分析

A spring-mass system based on the curvature difference of frequency response function

不同形式的结构大多可以简化看作无数个质量块与弹簧的组合体,因此为了研究结构的损伤以及结构损伤识别指标,对简化弹簧质量系统用ANSYS进行单个或多个同时出现的损伤情况进行数值模拟,选择频响函数曲率差作为损伤识别指标,对其损伤位置及程度进行检测,数值模拟的结果验证了频响函数曲率差对该结构的有效性及精确性的同时,并得出激励作用的位置对该指标的检测结果有较大的影响,并且得出如何选择频率范围可以保证频响函数曲率对损伤位置与损伤程度的精确性。

Different forms of structures can been simplified as a combination of springs and mass. In order to study the damage and damage indecatirs of structure, this study has analyzed spring-mass system according the damage of single spring or many by using ANSYS. At the same time, by selecting frequency response function curvature as the damage indecator, this paper has detected the location and degree of the damage. The result of numerical simulation analysis has tested and verified the effectiveness and accuracy of this indeeator, meanwhile also obtained that the location of force impact can influence the detection result. In addition this study draw a conclusion that how to select the frequenee range to guarantee the indecator＇s effectiveness and accuracy.