Method for estimating bridge displacement based on acceleration sensor

Abstract

The invention belongs to the field of railway bridge detection, and relates to a method for estimating bridge displacement based on an acceleration sensor. According to the method, the influence of bridge cracks is considered, the damage of a bridge pier is considered with a multi-degree-of-freedom model, and a non-reference displacement estimation method is adopted. The method specifically comprises the following steps that: (1) a finite impulse response filter is applied to avoid displacement drift increased by double integration of acceleration under an uncertain boundary condition, and high-frequency zero-mean-value dynamic displacement is approximately obtained through the filtered acceleration; (2) quasi-static displacement is estimated by using the bending angle of a pier caused by gravity and the projection of the gravity on an acceleration axis; and (3) the high-frequency zero-mean dynamic displacement obtained in the step (1) and the quasi-static displacement obtained in the step (2) are superposed to obtain total estimated displacement. According to the method, the non-reference total displacement of the damaged pier can be estimated under the condition that information is not limited. The method has high precision and achieves measurement of the transverse displacement of the damaged component of a railway bridge.

Description

Technical field[0001]The present invention belongs to the field of railway bridge detection, and more particularly to a method based on an acceleration sensor estimation bridge displacement.Background technique[0002]In recent years, as the amount of railway transportation is increasing, because the landscape amplitude of the bridge is large, the more of the components produces lateral displacement, the more the traffic accidents.[0003]The change in the maximum displacement of the railway bridge under the train crosses is an important indicator of the health of the railroad owners and management personnel. Railway engineers need to observe and monitor the displacement of the bridge to determine the priority to repair the larger bridge. However, the displacement of the bridge with the sensor is very complicated, and its workload is not high enough.[0004]At present, there is a study of transverse displacement measurement using no reference displacement estimation method, such as the pa...

AI Technical Summary

Problems solved by technology

However, it is very complicated to use sensors to measure bridge displacement on site, and the workload is large and the accuracy is not high enough

[0004] At present, there have been studies on lateral displacement measurement using the no-reference displacement estimation method, such as the paper "No-reference Displacement Estimation Method and Verification Based on Cantilever Structures", but it is based on the research and calculation of the two-degree-of-freedom model, without considering bridge cracks Influence, the accuracy is not high enough

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