Investigation of coefficient of friction at the interface of automobile brake pads using Greenwood-Williamson contact model and novel test rig

IF 1.2 Q3 ENGINEERING, MECHANICAL

FME Transactions Pub Date : 2022-01-01 DOI:10.5937/fme2203561k

Mrunal P. Kshirsagar, H. Khairnar

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Abstract

Different brake pad materials are produced, each with their unique composition in the recent past, yet performing the same task and claiming to be better than others. The article provides references for different automotive brake pads subjected to various operating conditions. The present investigation develops an analytical approach for estimating COF and contact radius for different disc-brake pads, which can be used to design an efficient automotive brake pad-disc system under the given load and rotational speed. The coefficient of friction at the pad-disc interface is investigated considering Greenwood Williamson (GW) model and developed novel friction test rig. A MATLAB program along with FFT was developed to simulate the surface topography of the contact interface during the braking process aiding the estimation of contact radius. Surface topography of tested brake pads has been analyzed using an infinite-focus-microscope to verify contact radius. At last, the reference is verified by an experimental investigation using a developed test rig and considering operating parameters.

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基于Greenwood-Williamson接触模型和新型试验台的汽车刹车片接触面摩擦系数研究

生产不同的刹车片材料，每一个都有其独特的成分，在最近的过去，但执行相同的任务，并声称比别人更好。本文为不同工况下的汽车刹车片提供参考。本研究提出了一种估算不同盘式刹车片COF和接触半径的分析方法，可用于在给定载荷和转速下设计高效的汽车刹车片-盘式系统。考虑Greenwood Williamson (GW)模型，研究了垫盘界面处的摩擦系数，并研制了新型摩擦试验台。开发了MATLAB程序，并结合FFT对制动过程中接触界面的表面形貌进行了仿真，帮助估计了接触半径。用无限聚焦显微镜分析了被试刹车片的表面形貌，验证了接触半径。最后，利用自行研制的试验装置，结合运行参数，进行了试验研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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