Urban rail vehicle wheel set curve fitting method

A technology for curve fitting and urban rail vehicles, applied in complex mathematical operations and other directions, it can solve the problems of over-fitting of curves and low accuracy of calculation results, and achieve the effects of small calculation errors, high fitting accuracy and high detection accuracy.

Active Publication Date: 2017-12-08
NANJING UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

He Ping of Harbin Institute of Technology proposed an online detection system for wheel rims based on least squares fitting, but this method has the problems of over-fitting curves and low accuracy of calculation results

Method used

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  • Urban rail vehicle wheel set curve fitting method
  • Urban rail vehicle wheel set curve fitting method
  • Urban rail vehicle wheel set curve fitting method

Examples

Experimental program
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Effect test

Embodiment 1

[0082] Taking the wheel-set surface information data collected by a set of wheel-set size online detection system installed in the vehicle maintenance warehouse of a subway company as the research object, multiple sets of wheel-set surface detection data were collected, and the method was explained with one set of data.

[0083] From the data information points on the wheel set surface, it can be determined that the inner end surface of the wheel set tread without wear is the reference line l, and the curve segment to be fitted by the wheel set rim is [l-d 2 ,l-d 1 ], where d 1 ∈(2,7),d 2 ∈(35,40); the curve segment to be fitted on the wheel set tread is [l-70-d 3 ,l-70+d 4 ], where d 3 、d 4 ∈(8,25).

[0084] Preprocess the data to obtain the coordinate points of the tread data as shown in formula (10)

[0085]

[0086] The coordinate points of the rim data are shown in formula (11)

[0087]

[0088] Using the least squares support vector machine to fit the tread...

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Abstract

The invention discloses an urban rail vehicle wheel set curve fitting method. According to the method, wheel set surface data information points are acquired, wherein wheel set surface data information is acquired through two-dimensional laser displacement sensors arranged at the two sides of a rail; the surface data information is preprocessed, wherein detected wheel set surface data is preprocessed, and a reconstructed wheel set surface curve is obtained; a to-be-fitted curve segment is determined, wherein a to-be-fitted region on a wheel set curve is determined according to the reconstructed wheel set surface curve; wheel set curve fitting is performed, wherein a least square support vector machine method is adopted to perform fitting processing on the wheel set surface curve within the to-be-fitted region range, and a complete wheel set surface curve is obtained; and wheel set dimension parameters are calculated, wherein the wheel set dimension parameters are obtained through calculation according to wheel set dimension parameter definition criteria. Through the method, the two-dimensional laser displacement sensors are used to acquire the wheel set surface data information, the least square support vector machine method is used to convert a nonlinear approximation problem into a linear approximation problem, therefore, the fitting effect is good, and the calculation result is accurate.

Description

technical field [0001] The invention belongs to the technical field of traffic safety engineering, in particular to a wheel set curve fitting method of an urban rail vehicle. Background technique [0002] Urban rail trains are the core of rail transit. To realize the modernization of urban rail transit, advanced modern urban rail trains must be developed. This is a prerequisite and cannot be ignored. Urban rail train is a complex and comprehensive system with a large amount of equipment and complex technology. Urban rail trains generally run in interval tunnels. When a fault occurs or an emergency occurs, this operating environment is not conducive to evacuation of personnel and handling of emergency situations. Therefore, the primary task of urban rail transit system construction and operation phase is "safety". [0003] The wheel set is an important part of the running part of the urban rail train, which carries the weight of the entire train. The change of the wheel set...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/12G06F17/15
CPCG06F17/12G06F17/15
Inventor 曹康邢宗义
Owner NANJING UNIV OF SCI & TECH
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