Friction Coefficient Characteristics of Typical Subway Brake Shoes and Brake Pads in Service

Guo, Ziheng; Zuo, Jianyong; Ding, Jingxian; Wang, Xueping

doi:10.1088/1742-6596/2542/1/012007

Cited by 1 publication

(1 citation statement)

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“…It is often used to describe instantaneous friction behavior, such as the initial friction experienced by an object when it overcomes static friction and initiates motion at the beginning of relative motion between two objects. The instantaneous coefficient of friction may be relatively high because it takes into account this momentary additional drag, while the subsequent friction may settle to a lower level [30,31]. In this study, on considering the universality of research on GCr15 bearing steel, the average friction coefficient is used for analysis.…”

Section: Friction Coefficientmentioning

confidence: 99%

Mechanism Study of Symmetric Mechanism-Rolling Bearing Dynamic System Considering the Influence of Temperature Factor

Zhang,

Liu,

Wang

et al. 2023

Symmetry

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Due to the symmetry of their structure and the way they rotate, rolling bearings are often used at high temperatures and high speeds. When the temperature changes, the material properties of the rolling bearing change, which in turn causes the dynamic model equation of the rolling bearing to change. Given the problem in that the conventional dynamic model equation does not consider temperature changes, but because temperature changes cause changes in material performance parameters resulting in differences between the dynamic simulation signals and the actual signals, this paper fully considers three factors, namely, the thermal expansion coefficient, the hardness value, and the friction coefficient. With the influence of temperature changes, a study on the mechanism of the symmetric mechanism-rolling bearing dynamic system considering the influence of temperature factors is proposed. First, combined with the material properties of the rolling bearing, the changes in thermal expansion coefficient, hardness value, and friction coefficient caused by temperature changes were analyzed. Second, the functional relationship expressions obtained above were substituted into the existing conventional dynamic model. Finally, the comprehensive functional relationship formula was substituted into the conventional dynamic model to obtain the rolling bearing dynamic model under temperature difference changes. By studying the mechanism of the symmetric mechanism-rolling bearing dynamic system that considers the influence of temperature factors, this method can undertake a more comprehensive consideration of the dynamic analysis research into rolling bearing fault diagnosis, thereby verifying the effectiveness of the method.

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Section: Friction Coefficientmentioning

confidence: 99%