Effect of Moisture Adsorption on Low-Speed and Moderate-Speed Braking: Effect on In-Stop Friction Coefficient and Low Frequency Noise

Q3 Engineering

SAE Technical Papers Pub Date : 2023-11-05 DOI:10.4271/2023-01-1862

Meechai Sriwiboon, Saiprasit Koetniyom, Seong Kwan Rhee, Jittrathep Sukultanasorn, Kritsana Kaewlob, Jitpanu Kunthong

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引用次数: 0

Abstract

Copper-free NAO disc pads of passenger cars were investigated for a combination of prior braking conditions and moisture adsorption influencing in-stop friction and noise during low-speed stops, and in-stop-friction during moderate-speed stops. Prior braking conditions and moisture adsorption strongly influence subsequent in-stop friction behavior and noise at room temperature. The low-speed in-stop friction behavior looks totally different from that of moderate-speed stops. The low-speed in-stop friction increasingly oscillates with increasing moisture adsorption and goes down towards the end of a stop, which is accompanied by increasing low-frequency noise.

The moisture content needs to be quantified/specified to obtain repeatable/reproducible brake test results as the moisture is an unintended and uncontrolled ingredient of a friction material. As the disc surface roughness increases due to prior braking conditions, the friction coefficient of low-speed stops is found to decrease. The changing friction coefficient is explained by the nature of the friction film and its interactions with moisture.

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湿吸附对低速和中速制动的影响:对制动时摩擦系数和低频噪声的影响

<div class="section摘要"><div class="htmlview段落">对乘用车无铜NAO盘垫进行了综合研究，研究了制动前条件和吸湿量对低速停车时停车摩擦和噪声的影响以及中速停车时停车摩擦的影响。在室温下，先前的制动条件和水分吸附强烈影响随后的停车摩擦行为和噪声。低速停车时的摩擦行为与中速停车时的完全不同。低速停站摩擦随着吸湿量的增加而不断振荡，并在停站结束时下降，同时伴随着低频噪声的增加。</div><div class="htmlview段落">由于水分是摩擦材料的非预期和不可控制的成分，因此需要对水分含量进行量化/规定，以获得可重复/可再现的制动试验结果。由于先前的制动条件，由于盘片表面粗糙度的增加，低速停车时的摩擦系数减小。摩擦系数的变化可以用摩擦膜的性质及其与水分的相互作用来解释。

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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来源期刊

SAE Technical Papers Engineering-Industrial and Manufacturing Engineering

CiteScore

1.00

自引率

0.00%

发文量

1487

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