Vehicle axle counting method based on steel rail deformation / stress parameters

Abstract

The invention discloses a method for counting vehicle axles based on steel-rail deformation or stress parameters. The method comprises the steps as follows: a sensor test point is firstly disposed on a steel rail, the sensor test point is provided with a sensor used for inducing the steel-rail deformation or the stress, and the sensor test point sets the threshold value of the sensor; when a wheel runs over the steel-rail where the sensor is arranged, the sensor records the occurrence of the status if the steel-rail deformation or the stress excesses the threshold value; and the number of the vehicle axles is determined according to the status messages. The solution of counting the vehicle axles provided by the invention is achieved by utilizing the sensor such as a fiber grating or an electrical strain foil, and the method preferentially selects an indirect measuring mode. Therefore, the method can technically avoid the problems existing in the traditional system for counting the vehicle axles, and the method has high stability and strong anti-interference ability.

Description

technical field [0001] The invention relates to a vehicle axle counting method used in a rail transit system, in particular to a railway vehicle axle counting method realized based on rail deformation or stress parameters, and belongs to the technical field of train operation monitoring. Background technique [0002] Vehicle axle counting is a technology for business applications such as track section occupancy inspection and hump length measurement by detecting the number of axles of a train passing a specific axle counting point on the track. It is one of the important basic technologies in the field of railway signal monitoring. [0003] The traditional axle counting device is generally composed of sensors, counting comparators and transmission equipment. It applies the principle of the magnetic field to calculate the number of axles passing through the train by cutting the magnetic lines of force with the wheels. In the Chinese invention patent that the patent No. is C...

AI Technical Summary

Problems solved by technology

[0004] However, these traditional axle counting devices have the following disadvantages in practical applications: they are easily affected by external electromagnetic radiation and the movement of other non-wheel objects around them; the magnetic head device is relatively fragile and relatively exposed, and is easily splashed by the side of the road gravel damage etc.

[0007] However, the above-mentioned railway monitoring system only roughly proposed the technical idea of ​​using fiber gratings to count axles, and did not provide a specific implementation plan

Moreover, in this invention, the optical fiber is directly attached on the rail to carry out the monitoring of relevant parameters (see the figure 2 ), this direct measurement method can easily lead to the situation that the optical fiber is destroyed by flying rocks

Since the welding method is easily affected by the strong vibration of the wheel and rail, the welding is easy to be opened, and the adhesive method is easily affected by aging and thermal expansion and contraction, so the sensor used for direct measurement is easy to fall off or fail, and it is not suitable for long-term use.

In addition, the sensor installation method used for direct measurement is difficult to disassemble, which is very unfavorable for the maintenance of the rail system, and it is difficult to migrate the sensor according to the specific needs of the measurement, so it is difficult to realize temporary measurement economically

Therefore, in actual operation, the direct measurement method provided by the above invention patent application is not advisable

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