A method and experiment of rapid identification of time-varying load using limited vibration response

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (12) : 275-282.

XIANG Ziru1,2, WANG Yi1, QIAN Wangping1, GU Zhenyuan1

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Abstract

Moving force is one of the main factors that affect the service life of the bridge, accurate identification of moving force can provide an important basis for bridge maintenance. Over the past few decades, the research on moving force identification has formed a variety of methods based on time-domain method and frequency-domain method, and has made great achievements. However, in order to solve the problems such as time-consuming and ill conditioned, most of the existing technologies need to use multiple measuring points and complex optimization, which are not friendly in practical applications. Based on the time domain deconvolution method and the load shape function method, a new construction matrix is defined to extract the effective elements of the system matrix for force identification, which can guarantee the robustness to large noise, and further reduce the number of measuring points and the calculation cost. The numerical simulation shows that the method identifies the moving force on a simply supported beam with good stability and accuracy, even using a single dynamic deflection response with 20% white noise. The proposed method has also been verified with 2 experiments, both point force and moving force are successfully determined, the accuracy and calculation efficiency can meet the engineering requirements.

Key words

Moving Force Identification / Time Domain Method / Bridge Health Monitoring

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XIANG Ziru1,2, WANG Yi1, QIAN Wangping1, GU Zhenyuan1. A method and experiment of rapid identification of time-varying load using limited vibration response[J]. Journal of Vibration and Shock, 2022, 41(12): 275-282

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