Device and method for measuring dynamic displacement of bridge based on mobile terminal

Abstract

The invention discloses a device and a method for measuring the dynamic displacement of a bridge based on a mobile terminal. The mobile terminal is integrated with an acceleration sensor. The device comprises a parameter setting module, an acceleration measuring module, a vibration data processing module and a display module. The invention further discloses the measuring method comprising the following steps: the sampling length and the direction of measured acceleration are set; the mobile terminal is fixed to a bridge dynamic displacement monitoring point; an API provided by a mobile terminal operating system is called to access underlying hardware and read a bridge vibration signal acquired by the acceleration sensor; an acceleration time-history signal is obtained according to the bridge vibration signal, FFT transform is performed on the acceleration time-history signal, quadratic integral is carried out in a frequency domain to obtain a frequency domain signal of displacement, low-frequency noise is filtered by use of a low-frequency cutoff algorithm, and IFFT transform is performed on the processed frequency domain signal of displacement to obtain a time-history signal of displacement. The device and the method of the invention have the advantages of simple detection process, low cost, small size, convenient carrying, and no need for adding any hardware.

Description

technical field [0001] The invention relates to the field of vibration measurement research, in particular to a device and method for measuring bridge dynamic displacement based on a mobile terminal. Background technique [0002] Vibration is a common phenomenon in the process of bridge operation, especially when vehicles pass by, the bridge will vibrate violently. Theoretically, if the bridge structure does not change, the vibration parameters of the bridge are fixed. Conversely, if the vibration parameters of the bridge change, it indicates that the bridge structure has also changed. Therefore, the vibration parameters of the bridge are the bridge work An important indicator of status. The dynamic displacement is produced by the bridge under the action of moving load, which reflects the stiffness characteristics of the bridge. Accurately measuring the dynamic displacement of the bridge can provide a scientific reference for the maintenance and reinforcement of the bridge....

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to provide a method based on the above-mentioned bridge dynamic displacement measurement device. The method uses the existing mobile terminal to realize the measurement of the bridge dynamic displacement, and solves the problem of the large volume and wiring problems of the existing vibration measurement equipment. The problem of heavy workload and high testing cost

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