Method for measuring vertical dynamic immunity of high-speed railway bridges

Abstract

The invention provides a method for measuring vertical dynamic immunity of high-speed railway bridges. According to the method, a middle measurement point and left and right reference points are arranged on a to-be-measured high-speed railway bridge. A measurement device is built on an unmanned aerial vehicle, and the measurement device comprises a camera and a plurality of optical lens assembliesarranged in front of the lens of the camera. Each optical lens assembly comprises an optical lens and a rotation mechanism. Each optical lens is adjusted to ensure that the left reference point, theright reference point and the middle measurement point marked on the to-be-measured high-speed railway bridge can be imaged in the lens of the camera and respectively imaged in R, G and B channels ofa shot image. Relatively displacements of the middle measurement point, the left reference point and the right reference point in a vertical direction under a world coordinate system are respectivelycalculated according to the image shot by the camera, so as to obtain vertical immunity of the high-speed railway bridge. The method is capable of realizing flexible and easy-to-operate high-precisionmeasurement of high-speed railway bridge immunity without being influenced by environment vibration, and the measurement process is simple and efficient.

Description

technical field [0001] The invention relates to the technical field of bridge dynamic displacement visual measurement, in particular to a method for measuring the vertical disturbance degree of a high-speed railway bridge. Background technique [0002] The dynamic displacement measurement of the high-speed rail bridge based on visual measurement technology needs to set up a camera equipped with a telephoto lens near the bridge to be tested, and use the camera to image the part of the bridge to be tested, record the position of the part to be tested on the image at different times, and then according to the bridge to be tested The position change of the measured part on the image is used to calculate the actual position change of the bridge to be measured, so as to obtain the dynamic displacement of the bridge part. The part to be tested can be a natural surface on the bridge, or a specially made optical mark can be pasted or fixed. [0003] The existing machine vision measu...

AI Technical Summary

Problems solved by technology

[0004] In addition, the camera has high requirements on the environment when imaging, because the measurement process is easily affected by the environment, so that the final measurement accuracy cannot meet the requirements

For example, when the camera is installed near the road, the road vibration caused by passing vehicles will directly affect the attitude stability of the camera, and it is difficult to meet the measurement accuracy requirements of the submillimeter level

Images