Abstract
The axle temperature monitoring of subway vehicles is a key technology to ensure the safety of trains. The existing axle temperature monitoring system is monitored by using trackside equipment or using axle temperature test paper, the system has the inferiority of poor real-time performance. In order to realize real-time and online monitoring of axle temperature, this paper presents a subway axle temperature monitoring device based on vibration energy recovery. The device is installed on the shaft end of the train axle, and uses the positive piezoelectric effect of piezoelectric ceramics to absorb vibration energy into electric energy, and continuously sends temperature signal through the radio frequency module to realize real-time monitoring of train axle temperature. A mathematical model of piezoelectric vibrator power output was established to obtain design parameters suitable for rail vehicle vibration, and the Ansys Workbench finite element analysis software was used for theoretical simulation verification. Finally, an experimental model was built and a vibration test was carried out on Shanghai metro line 1. The results show that the axial temperature monitoring device based on piezoelectric vibration can effectively obtain the axial temperature data and realize the online monitoring function.
Highlights
With the continuous increase of train speed and load, the occurrence of hot shaft, cutting shaft and even burning shaft accidents intensification, wheelset malfunction increasing obviously, especially rolling bearing malfunction [1]
Because ZigBee technology is a close transmission communication technology, data transmission between locomotive monitoring platform and station control room platform cannot be realized at the same time. These sensors and radio frequency modules all need external power supply, and the use of power supply in the carriage will damage the layout structure of the carriage, bringing unexpected safety risks
An energy recovery technology based on piezoelectric effect has been applied in many fields, which provides a new method for power supply of train axle temperature sensor. [11,12,13,14,15]
Summary
With the continuous increase of train speed and load, the occurrence of hot shaft, cutting shaft and even burning shaft accidents intensification, wheelset malfunction increasing obviously, especially rolling bearing malfunction [1]. The widely used monitoring methods of train axle temperature can be divided into two types: vehicle contact and rail side induction [3,4,5,6,7]. Because ZigBee technology is a close transmission communication technology, data transmission between locomotive monitoring platform and station control room platform cannot be realized at the same time. These sensors and radio frequency modules all need external power supply, and the use of power supply in the carriage will damage the layout structure of the carriage, bringing unexpected safety risks. An energy recovery technology based on piezoelectric effect has been applied in many fields, which provides a new method for power supply of train axle temperature sensor. [11,12,13,14,15]
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