Damage detection for a beam based on imaginary part of its FRF
ZHANG Yufei 1,2 WANG Shanshan 1
1. College of Mechanics and Materials, Hohai University, Nanjing 210098, China;
2. Power China Huadong Survey & Design Institute Co., Ltd., Hangzhou 311122, China
A damage detection method for a beam based on imaginary part of its frequency response function (FRF) was proposed. According to the beam’s modal shape curvatures, an index called CIFF to judge its damage was defined. This index needs to use the beam random vibration response information after its damage to avoid the disadvantage of needing the modal information of the beam before its damage and consider the beam system error and noise disturbance to a certain extent. Through a dynamic test of a steel cantilever beam, the effectiveness using this method to judge the beam’s single-crack damage and multi-crack damage was verified. The test results indicated that the proposed method can not only be used to detect damage’s position, but also reflect its level. The results provided a reference for the damage detection of real beam structures.
张宇飞 1,2,王山山 1. 基于频响函数虚部的梁结构损伤检测[J]. 振动与冲击, 2018, 37(2): 38-42.
ZHANG Yufei 1,2 WANG Shanshan 1. Damage detection for a beam based on imaginary part of its FRF. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(2): 38-42.
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