Bridge vibration mode measuring method, device and system

Abstract

The invention relates to a bridge vibration mode measuring method, device and system. The system comprises a video acquisition device, a laser radar and an image data processing device; the laser radar is used for emitting single-line laser to a virtual measuring point of a bridge, the video acquisition device is used for acquiring video images of a target area before and after the single-line laser is emitted, and the image data processing device is used for measuring and calculating the vibration mode of the bridge according to the collected video image. According to the embodiment of the invention, the video and the single-line laser are combined, the virtual measuring point in the target area image is obtained, the single-line laser is emitted to the virtual measuring point to obtain the displacement vector of the virtual measuring point, the static balance curve of the bridge is further obtained, and the original vibration mode of the bridge is obtained through the change of the spatial position of the virtual measuring point; and the vibration response of the virtual measuring point is obtained in combination with the mobile phone shooting frame rate, so the vibration of the bridge is quantitatively described.

Description

technical field [0001] The invention belongs to the technical field of measurement, and in particular relates to a method, device and system for measuring bridge vibration shapes. Background technique [0002] The measurement of bridge structure vibration information is an essential content of bridge structure health monitoring. The vibration information of the structure reflects the overall safety performance of the bridge, and is an important data source for the damage identification and safety state assessment of the bridge structure. The vibration information of the structure includes key parameters such as natural frequency, mode shape, and damping coefficient. At present, there are relatively mature measurement methods for natural frequency and damping coefficient, but the effect of natural frequency and damping coefficient on structural damage identification and safety state assessment is not good. [0003] The measurement methods of bridge structure vibration can b...

AI Technical Summary

Problems solved by technology

But this method has the following disadvantages: (1) The number of measuring points is extremely limited, and it is impossible to obtain high-order mode shapes

(2) External power supply and data acquisition and transmission equipment are required

(3) The equipment cost of the sensor and its collector is high, and the installation is difficult

(4) The synchronization of the data of each measuring point is not high

However, the cost of this camera is very high, and it also has certain requirements for operators, and the processing of image data requires the cooperation of a computer with a higher configuration to complete

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