Decomposition and reconstruction of bridge vibration signals based on the harmonic window function

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (16) : 234-240.

YE Fei, WU Jiaquan, ZHANG Xinyu, XIAO Chi, MA Kun

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Abstract

Extraction of various order signals from the original beam vibration response signals is required in bridge damage detection.In this paper, a new method of signal extraction based on custom harmonic window function was proposed.The definition of custom harmonic window function and the process of decomposition and reconstruction were demonstrated.Five order vibration signals were extracted after decomposing and reconstructing the original vibration response signals of reinforced concrete beams.The results indicated that the custom harmonic window function could be used to achieve the free division of the signal frequency band.The extracted signal had no data loss, phase shift, or small signal distortion, and the noise was filtered simultaneously during signal extraction.

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harmonic window function / wavelet transform / damage detection / signal extraction

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YE Fei, WU Jiaquan, ZHANG Xinyu, XIAO Chi, MA Kun. Decomposition and reconstruction of bridge vibration signals based on the harmonic window function[J]. Journal of Vibration and Shock, 2018, 37(16): 234-240

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