Estimation of Rail Irregularity by Axle-Box Accelerometers on a High-Speed Train
This paper is focused on the rail irregularity estimation from axle-box vibration of an in-service high-speed train. Usually, the rail irregularity has been measured by a special railway inspection system during maintenance work. However, the procedure requires some mechanical or optical sensors that are sensitive to harsh railway environments, and it is too slow for in-service trains. Therefore, the procedure has to be performed in limited time and track sections. As a solution to this problem, measuring axle-box acceleration is proposed to estimate the lateral and vertical rail irregularities. For reliable estimation of displacement from the measurement, a method based on a Kalman filter and wavelength band-pass filters is proposed. The estimated results are compared with a railway inspection system. It is confirmed that the proposed method can provide useful rail estimates without any mechanical or optical sensors.
KeywordsKalman Filter Inspection System Train Speed Railway Vehicle High Speed Rail
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