Feasibility of measuring vibration frequency of rigid structure based on wMPS

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (19) : 41-47.

XIONG Chunbao, BAI Hongzhi, WANG Meng

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Abstract

The workspace measurement positioning system (wMPS) is a new network type large-scale 3D coordinate measurement system based on photoelectric scanning. It has advantages of high precision, good dynamic performance and parallel measurement. It is an instrument developed for large-scale structure in industrial measurement. Here, aiming at the problem of global navigation satellite system (GNSS), robotic total stations (RTS) and other geodesy equipment being not able to fully meet the measurement of inherent parameters of small rigid structures, such as, footbridges, wMPS was introduced into the field of structural health monitoring. The reverse engineering method was used to establish a test platform to simulate vibration frequency of a structure. The fast Fourier transform (FFT) was used to analyze displacement data obtained with variation of time series, and determine the feasibility and measurement range of wMPS for measuring structure inherent parameters. GNSS-RTK was used for contrastive test analysis. The test results showed that wMPS can be used to identify structure inherent parameters, and identify frequencies within the range of 0-4 Hz when displacement amplitude is within the range of 3-30 mm; the study results can provide a new reference for health monitoring of relatively rigid structures.

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workspace measurement positioning system (wMPS) / natural frequency / health monitoring / rigid structure

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XIONG Chunbao, BAI Hongzhi, WANG Meng. Feasibility of measuring vibration frequency of rigid structure based on wMPS[J]. Journal of Vibration and Shock, 2021, 40(19): 41-47

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