Experimental method for quickly measuring wheel-track adhesion-creeping curve

Abstract

The invention discloses an experimental method for quickly measuring a wheel-track adhesion-creeping curve. After test starting, servo-driven motors drive two rotating shafts to make same-speed rotation at a set simulation speed, wherein the creep rate is kept to be 0; a normal load is applied to a wheel sample shaft downwardly and thus the wheel and track samples make rolling contact, wherein interms of the interface contact stress, a field wheel track interface contact stress is horizontal. During the follow-up experiment process, a track sample shaft drive motor keeps a stable rotating speed and a wheel sample shaft drive motor carries out adjustment according to a set creep rate s changing curve; and the creep rate between the wheel and track samples is controlled to change accordingto a set curve, and an adhesion coefficient between the wheel and track samples during the creep rate changing process is measured and recorded. According to the method disclosed by the invention, a complete adhesion-creeping curve can be obtained in one experiment process; compared with the traditional method, the provided method enables the experiment time to be reduced effectively; the measuredcurve is uniform and continuous and contains more curve changing details; and the curve feature analysis can be carried out by using a numerical fitting method effectively.

Description

technical field [0001] The invention relates to an experimental technology for simulating wheel-rail rolling contact, in particular to an experimental method for measuring wheel-rail interface adhesion-creep curves and curve characteristics. Background technique [0002] The wheel-rail interface adhesion-creep curve reflects the available adhesion level of the wheel-rail interface during locomotive operation, and is an important parameter for locomotive dynamics research and adhesion control system design. Its curve characteristics (including the position of the peak point of the curve and the slope of the initial stage) It is a simplified index to evaluate the influence of creep rate on adhesion coefficient. [0003] Considering the economy and repeatability of the experiment, the wheel-rail interface adhesion experiment is widely simulated in the laboratory using the double-wheel-to-roll method, and the adhesion-creep curve is often determined by multiple independent exper...

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Problems solved by technology

[0004] Aiming at the problems existing in the existing experimental methods, the present invention intends to provide an experimental method for quickly measuring the adhesion-creep curve and curve characteristics of the wheel-rail interface. This method is also based on the double-wheel-to-roller wheel-rail rolling contact simulation experiment. By controlling the creep rate between the wheel and rail samples to change uniformly according to the set curve, a complete and continuous adhesion-creep curve can be automatically obtained within a set of experiments, and the curve can be automatically fitted by numerical fitting. Obtain the peak point position and initial slope of the curve

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