Damage detection for a beam based on imaginary part of its FRF

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (2) : 38-42.

ZHANG Yufei 1,2 WANG Shanshan 1

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Abstract

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.

Key words

frequency response function (FRF) / modal shape curvature / damage detection / dynamic response / dynamic test

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ZHANG Yufei 1,2 WANG Shanshan 1. Damage detection for a beam based on imaginary part of its FRF[J]. Journal of Vibration and Shock, 2018, 37(2): 38-42

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