Abstract
Monitoring the vibration offset of a car-body has been of great significance to ensure the operation safety of high-speed trains and reasonably determine the railway gauges. However, there has been scarce research on this topic. To address this limitation, this study proposes an offset measurement method based on the magnetoresistance effect that can be used for offset detection of railway car-body vibration. The magnetic field distribution of the method is simulated by the finite element method, and the feasibility is verified. In addition, the nonlinear relationship between the magnetic induction and the vibration offset is obtained by a neural network model. Finally, a magnetoresistive sensor-permanent magnet coupling monitoring system is developed, and its accuracy is verified by a series of static and dynamic tests. The test results reveal that the proposed monitoring method can effectively monitor the car-body offset relative to the track.
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