Track Condition Monitoring Based on Car-Body Acceleration Using Time-Frequency Analysis
A track condition monitoring system that uses a compact on-board sensing device has developed and applied for track condition monitoring of regional railway lines in Japan. This study describes the application of time-frequency analysis for condition moni
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Abstract. A track condition monitoring system that uses a compact on-board sensing device has developed and applied for track condition monitoring of regional railway lines in Japan. This study describes the application of time-frequency analysis for condition monitoring of railway tracks from car-body acceleration measured in in-service train. Simulation studies and field test results showed that Hilbert-Huang transform (HHT) gives good time-frequency resolution and intrinsic mode functions give the detail information of track faults. Keywords: Railway · Track Hilbert-Huang transform
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· Time-frequency analysis · Wavelet ·
Introduction
The condition of railway tracks is an important factor in ensuring the safe operation of trains [1]. To ensure that railway travel is safe and comfortable, it is necessary to maintain and manage tracks properly; this includes preventive maintenance. Further, it is desirable to monitor tracks frequently. The deformations that occur in tracks, referred to as track irregularities, are closely connected to the riding quality and safety of railway vehicles. Urban railway operators use track inspection cars to verify track irregularities. The most of track condition monitoring system using in-service train uses bogie or axle-box mounted sensors [2,3]. Car-body mounted sensors are much easier to manage but the faulty signals are attenuated by primary and secondary suspensions. Track condition monitoring systems that observe car-body vibrations in in-service vehicles have already been developed for regional railways and have exhibited the capability to oversee track conditions [4,5]. Additionally, recent studies proposed employing a Kalman filter to predict track irregularities from the acceleration measurements of car-body vibrations of railway vehicles [6,7]. On regional railway lines, many operators are unable to implement adequate inspections owing to problems such as cost and personnel constraints. Hence, lowcost monitoring systems have been developed based on on-board sensing devices c Springer Nature Switzerland AG 2020 M. Klomp et al. (Eds.): IAVSD 2019, LNME, pp. 103–112, 2020. https://doi.org/10.1007/978-3-030-38077-9_12
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H. Tsunashima
and global navigation satellite system (GNSS) data. In this system, the sensing device is installed in an in-service vehicle to measure car-body vibrations. The diagnosis is performed by rating the track conditions based on the measurement data. This paper describes an application of time-frequency analysis for car-body acceleration to detect track faults.
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Track Condition Monitoring System System Overview
Figure 1 presents an overview of the track condition monitoring system. The system in an in-service vehicle consists of a compact on-board sensing device for measuring car-body vibrations and diagnosis software for identifying track conditions from the data. The data are transmitted to a server via a wireless phone connection and examined by using track condition diagnosis software. The results of the diagnosis are fed back to t
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