Vehicle speed measuring method based on steel rail deformation / stress parameters

A stress parameter and deformation technology, applied in the measurement of vehicle running speed in rail transit system, in the field of rail transit vehicle speed measurement, can solve the problem of not being used in vehicle speed measurement methods, etc., to avoid low reliability and weather interference. Effect

Inactive Publication Date: 2009-03-04
BEIJING JIAXUN FEIHONG ELECTRIC CO LTD
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Problems solved by technology

However, the measurement of rail deformation parameters in the prior art has been only used in rail manufacturing and maintenance and establishment of wheel-rail force models, and has not been used in vehicle speed measurement methods

Method used

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  • Vehicle speed measuring method based on steel rail deformation / stress parameters
  • Vehicle speed measuring method based on steel rail deformation / stress parameters
  • Vehicle speed measuring method based on steel rail deformation / stress parameters

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Embodiment Construction

[0029] The rails change shape under the weight of the train wheels. Therefore, by arranging deformation / stress sensors at two measuring points distributed along the running direction of the train with a distance of L, and measuring the deformation induction of different measuring points under the same wheel set, the time T for the train wheels to pass through the distance L is obtained; or, Measure the deformation induction of the rail under different wheel sets at the same measurement point, measure the time difference of the deformation induction, and obtain the time T for the train wheels to pass through the standard wheelbase, thereby obtaining the running speed V of the train. Here it is the basic realization thought of the present invention.

[0030] The above-mentioned sensor for sensing the shape change of the rail may be a fiber grating installed on the rail, an electrical strain gauge or other sensors for sensing the shape stress change. They can be installed by usi...

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Abstract

The invention discloses a speed measurement method for vehicles based on rail deformation / stress parameters. In the method, deformation sensors are distributed on two measurement points which are distributed along the direction of train movement and have the distance of L to measure the deformation sensing of different measurement points under the same wheel pair, and thus the time of the train wheel passing through the distance of L, or the deformation sensing at the same measurement point of the rail under different wheel pairs is measured; the time difference of deformation sensing is measured to obtain the time of the train wheel passing through the standard wheel distance, and thus the train running speed is obtained. With the invention, the problem of low reliability existing in the current train-ground communication can be avoided. At the same time, the sensors adopt electric strain foils or optical fiber gratings, not only the interference of weather can be avoided, but also the interference on the existing electromagnetic systems at roadside can be avoided.

Description

technical field [0001] The invention relates to a method for measuring the running speed of a vehicle in a rail transit system, in particular to a method for measuring the speed of a rail transit vehicle based on rail deformation or stress parameters, and belongs to the technical field of train operation monitoring. Background technique [0002] In the rail transit system, the monitoring of the train running speed is an important factor to ensure the safe and punctual operation of the train. In the prior art, radar speed measurement, laser speed measurement or vehicle-mounted speed measurement equipment are generally used to measure the running speed of the train. But all there is certain use defect in these equipments. For example, for laser and radar speed measuring equipment, it will be interfered by foreign objects in the air in dusty, rainy and snowy weather, which will affect the accuracy of measurement. The use of radar speed measurement will also generate electroma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/64G01P3/80B61L1/16B61L23/04
Inventor 辛斌吕志东袁军国李明华
Owner BEIJING JIAXUN FEIHONG ELECTRIC CO LTD
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