Non-contact railway bridge condition comprehensive detection method and system

Abstract

The application discloses a non-contact comprehensive detection method and system of railway bridge conditions, including: acquiring dynamic characteristic parameters of railway bridges through an acceleration sensor installed on a track detection vehicle; using a laser ultrasonic probe installed on the track detection vehicle to send out The laser is irradiated to the surface of the rail to draw the sound pressure distribution map of the apparent defect of the rail; the time-reversal algorithm is used to reconstruct the photoacoustic image of the apparent defect of the rail; the modal decomposition method is used to extract the features containing the information of the apparent defect of the rail parameters; the support vector machine is used to classify the apparent defects of the rails and determine the internal damage degree; according to the obtained dynamic characteristic parameters, the classification results and the determined internal damage degree combined with the historical data of the railway bridge condition, the operation status of the railway bridge is evaluated. . This effectively avoids arranging sensors on railway bridges, reduces the difficulty of data processing, reduces the labor intensity of manual detection, and saves detection costs.

Description

technical field [0001] The invention relates to the field of railway bridge detection, in particular to a non-contact comprehensive detection method and system for the condition of railway bridges. Background technique [0002] With the rapid development of my country's high-speed railway, as of the end of 2019, the total mileage of my country's high-speed railway has exceeded 35,000 kilometers. As an important part of high-speed railways, bridges account for a very high proportion of lines, such as 86.6% for the Beijing-Tianjin intercity bridge, 80.5% for the Beijing-Shanghai high-speed railway, and 94.0% for the Guangzhou-Zhuhai intercity bridge. In the case of high-speed rail with increasing speed, increasing load and harsh environment, the performance and health of high-speed rail bridge structures have a crucial impact on the operation safety of high-speed trains. How to detect and evaluate high-speed rail bridges is an urgent problem to be solved in the construction, ...

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Problems solved by technology

[0003] At present, most of the detection methods for railway bridges are manual detection, which will inevitably lead to missed detection or insufficient detection depth, and cannot guarantee the complete elimination of potential safety hazards in railway bridge structures; At night, the working time and work site are severely limited. With the efficient operation of the railway, the skylight time will gradually shorten, which will put more pressure on the detection of railway bridges during the skylight time; the real-time performance is poor, and safety hazards cannot be found in time prevention and early warning

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