Method and device for measuring track irregularity

Abstract

The invention provides a method and device for measuring track irregularity. The method for measuring track irregularity comprises the steps that based on a measurement method of a multi-measurement point multi-order chord measurement method, a plurality of groups of combined chord measurement values in a target section are measured according to a preset sampling step size; on the basis of the measurement process of the multi-measurement point multi-order chord measurement method and on the basis that a matrix of the multiple groups of combined chord measurement values is equal to the productof a measurement matrix and a matrix formed by adjacent discretization of steel rail geometry, a measurement model for measuring short-wave irregularity of a steel rail is established; and by constructing an optimization model of the measurement model and performing inversion solution on the optimization model, track irregularity is obtained. In this way, detection data of a plurality of measuringpoints can be effectively integrated, the measurement error control is realized through linear system solution, and the measurement accuracy is improved while smaller resolution of the measurement wavelength is ensured; and the maximum utilization of sensors at the measuring points is realized through the combined optimization of measurement point positions of the chord measurement method, and ameasurement result with higher precision is obtained.

Description

Technical field [0001] This application relates to the technical field of rail measurement, and specifically to a method and device for measuring track irregularities. Background technique [0002] Track irregularities include short-wave rail irregularities and long-wave rail irregularities in rail transit. Take the short-wave rail irregularities as an example, which mainly include rail surface roughness, rail surface irregularities and wheel tread irregularities. Short-wave rail irregularities will not only excite wheel-rail rolling vibration and noise, but also cause high-frequency wheel-rail contact forces. And the impact force, and further cause damages such as fatigue cracks and rail corrugation on the surface of the wheel or rail. Therefore, detecting and analyzing track irregularities is the prerequisite and basis for reasonable rail maintenance, repair, wheel-rail vibration and noise control, and prolonged rail service life. [0003] Related technology provides a string m...

AI Technical Summary

Problems solved by technology

With this method, on the one hand, the filtering process will cause data loss at both ends of the measurement section; on the other hand, the design of the filter in the case of asymmetry is too complicated, which will cause errors in the measurement results due to the filter design. And it cannot solve the problem of data fusion in the case of multiple measuring points

[0004] Related technologies also provide a dynamic response-based acceleration quadratic integration method that needs to maintain a certain measurement speed, requiring the measuring instrument to be in an excited state, and the measurement effect is not good at low speeds

Images