A Method for Determining Catenary Defect Location Based on P-wave and S-wave Velocity Difference

Abstract

The invention discloses a method for determining the position of a catenary defect based on the difference in velocity of longitudinal and shear waves, comprising the following steps: S1, determining the time difference between the arrival of the longitudinal wave and the transverse wave at the defect position at the detection point; S2, calculating the distance between the defect position and the detection point . Specifically, by selecting the maximum value of the longitudinal wave amplitude within a certain period of time, and corresponding to the time points when the longitudinal wave matches the shear wave multiple times, the propagation time difference between the longitudinal wave and the shear wave is obtained, thereby determining the distance between the defect position and the detection point, and realizing the detection of the defect position. Precise positioning improves efficiency and reduces costs.

Description

technical field [0001] The invention relates to the technical field of catenary, in particular to a method for determining the defect position of catenary based on the velocity difference of longitudinal wave and shear wave. Background technique [0002] The catenary is a high-voltage transmission line erected in a "zigzag" shape along the sky above the rails in the electrified railway for the pantograph to take current. The catenary is the main frame of the railway electrification project, and it is a special form of transmission line erected along the railway line to supply power to the electric locomotive. The quality and working status of the catenary will directly affect the transportation capacity of the electrified railway. Therefore, the catenary is required to ensure a good supply of electric power to the electric locomotive under any conditions, to ensure the safety of the electric locomotive on the line, high-speed operation, and In the case of meeting the above ...

AI Technical Summary

Problems solved by technology

The quality and working status of the catenary will directly affect the transportation capacity of the electrified railway. Therefore, the catenary is required to ensure a good supply of electric power to the electric locomotive under any conditions, to ensure the safety of the electric locomotive on the line, high-speed operation, and In the case of meeting the above requirements, the investment should be saved as much as possible, the structure is reasonable, and the maintenance is simple. Usually, a vibration sensor is installed at the anchorage position of the catenary. According to the detection data of the vibration sensor, defects such as hard points and cracks of the catenary can be monitored. , but usually can only determine which anchor segment the defect is in, but cannot accurately determine the location of the defect

Potential defects are analyzed, but the exact location of the defect cannot be determined. When maintenance workers conduct on-site inspections, it takes a lot of time to confirm the location of the defect. It is not easy to find, or even may not be found, wasting a lot of manpower and material resources

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