A wireless sensor-based cable force and bending stiffness monitoring method and system

Abstract

The invention provides a cable force and bending rigidity monitoring method and system based on a wireless sensor. According to the method and system for monitoring the cable force and bending rigidity of a cable structure through the wireless sensor, the wireless sensor is used to acquire a cable vibration acceleration signal corresponding to the cable structure; Welch transform processing is performed on the cable vibration acceleration signal to acquire the corresponding cable vibration power spectrum and the fundamental frequency and the harmonic frequency in the cable vibration power spectrum; and according to the fundamental frequency and the harmonic frequency, the cable force and / or bending rigidity corresponding to the cable structure are calculated.

Description

technical field [0001] The invention relates to the technical field of building structure monitoring, in particular to a wireless sensor-based cable force and bending stiffness monitoring method and system. Background technique [0002] In large-scale civil construction, especially in the construction of large bridges such as cable-stayed bridges, cable structures are usually used as the supporting cable structures of cable-stayed bridges. In a cable-stayed bridge, the cable force and bending stiffness corresponding to the cable structure are important physical parameters that reflect the performance of the cable structure. By calculating the cable force and bending stiffness of the cable structure, the force of the cable structure can be obtained intuitively. It has important reference significance for analyzing the health status of the cable structure. In order to obtain the cable force and bending stiffness of the cable structure, the existing technology uses wireless se...

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Problems solved by technology

[0003] Although the prior art uses wireless sensors to measure the cable vibration acceleration signal of the cable structure, and estimates the corresponding cable vibration power spectrum through the fast Fourier transform method, but due to the computational defects of the fast Fourier transform itself, it reduces the The cable vibration power spectrum is about the accuracy of frequency point estimation, and the above method only uses the fundamental frequency of cable vibration to calculate the cable force, which cannot calculate the bending stiffness of the cable structure, and the accuracy of the calculated cable force is not high

In addition, the above method only uses a wireless sensor to measure the acceleration signal of the cable structure corresponding to the vibration of the cable. The wireless sensor cannot perform subsequent transformation and calculation processing on the acceleration signal. The wireless sensor finally needs to transmit the measured acceleration signal to the The corresponding transformation and operation processing are completed in the cloud server, which greatly reduces the accuracy of data operation processing and increases the power consumption of data transmission

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