Dynamic Response and Crack detection of Simply Supported beam under moving loads

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (6) : 97-103.

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Dynamic Response and Crack detection of Simply Supported beam under moving loads

ZHAO Jun1,2 ;ZHANG WEI-wei3; MA Hong-wei2

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Abstract

The objective is to show the potential of the crack detection method based on Multi-resolution Analysis of Wavelet, which is depending on the response at a single point on a beam-like structure subject to concentrated moving loads. When moving along the structure ,the moving loads cause small distortions in the dynamic response of the beam-like structure at the crack locations .In general, these small distortions are difficult to detect visually. An ANSYS model of a cracked beam is established. The moving load is transient analyzed by shifting the point of the concentrated force. The response at mid-span of the beam-like structure is calculated and Wavelet Multi-resolution transformed. The crack on the beam-like structure can be found by position of peak of Wavelet Multi-Resolution Analysis, also the velocity and acceleration of the moving load. Furthermore, By the Principle of superposition, the solution obtained for a single moving load will be expanded to deal with a series of identical , equi-distant moving loads and opposite direction moving loads, by which the key parameter dominating the dynamic response of the beam-like structure can be identified. Finally, The effects of several cracks location and the best wavelet selection are discussed in detail. The proposed method is applicable for low velocity-movements while high velocity-movements are not recommended

Key words

Moving loads / Crack Beam / Damage Detection / Multi-resolution Analysis of Wavelet

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ZHAO Jun;;ZHANG WEI-wei;MA Hong-wei. Dynamic Response and Crack detection of Simply Supported beam under moving loads[J]. Journal of Vibration and Shock, 2011, 30(6): 97-103