The Effect of Friction Radius Variation on the Friction-Induced Vibration and Noise

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Sujie Li, Zaiyu Xiang, Songlan Xie, Jiakun Zhang, Zhengming Xiao, Bin Tang, Deqiang He
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引用次数: 0

Abstract

In mechanical equipment friction pairs, there are instances of varying friction radius (e.g., brake pads in trains), but the impact of variation in friction radius on friction-induced vibration noise (FIVN) has not yet been clearly understood and has drawn little attention. To address this, a series of tests under different friction radii were carried out using a CETR friction and wear tester, and a finite element model(FEM) based on the main structure of the tester was established to carry out complex modal and transient dynamic simulations. Furthermore, a two-degree-of-freedom (2-DOF) numerical model was proposed to analyze the stability and dynamic characteristics of the ball-disc friction system. Based on the FIVN simulation tests, finite element simulations, and numerical analysis results, the impact of variations in the friction radius on FIVN was discussed. The results indicate that the friction radius is a crucial factor impacting the intensity and evolution of FIVN. Under the experimental parameters employed in this study, the intensity of FIVN increases with the enlargement of the friction radius. Correspondingly, an increase in friction radius significantly increases the friction disc’s wear. The scratches’ width, depth, and wear volume increase. In the friction process, the increase in friction radius leads to an increase in the wear amount of the friction disk, which also results in a significant accumulation of wear debris actively engaging in the frictional process at the interface. Therefore, the degradation of the friction surface becomes increasingly severe and exhibits complex tribological behaviors. The increase in friction radius facilitates modal coupling phenomena in friction systems, inducing high-intensity unstable vibrations within this system. Furthermore, with a larger friction radius, the structure of the friction system is more prone to deform. As the friction ball moves more significantly along with the friction disk, the concentration of contact stress at the interface intensifies notably in the region adjacent to the cutting-in end, accompanied by an increase in the numerical value of the contact stress. In scenarios with a large friction radius, the concentration of contact stress on surfaces is the primary reason for the greater width, depth, and wear volume of the scratches on the friction disc. The 2-DOF numerical model of the ball-disc friction system we established effectively helped us discuss the impact of the friction radius and coefficient of friction (COF) on system stability. It is found that under a large friction radius and COF, the system exhibits modal coupling phenomena, with a state of vibrational instability. The intensity of friction-induced vibration (FIV) also increases with the friction radius. In conclusion, this study finds that the friction radius is a key factor affecting FIVN, and appropriate measures should be taken to improve the tribological behavior of the interface to suppress FIVN when encountered a large friction radius.

摩擦半径变化对摩擦引起的振动和噪音的影响
在机械设备摩擦副中,存在摩擦半径变化的情况(如列车的刹车片),但摩擦半径变化对摩擦诱发振动噪声(FIVN)的影响尚未得到清楚的认识,也很少引起人们的关注。针对这一问题,我们使用 CETR 摩擦和磨损试验机进行了一系列不同摩擦半径下的试验,并建立了基于试验机主体结构的有限元模型(FEM),以进行复杂的模态和瞬态动态模拟。此外,还提出了一个二自由度(2-DOF)数值模型,用于分析球盘摩擦系统的稳定性和动态特性。根据 FIVN 模拟试验、有限元模拟和数值分析结果,讨论了摩擦半径变化对 FIVN 的影响。结果表明,摩擦半径是影响 FIVN 强度和演变的关键因素。在本研究采用的实验参数下,FIVN 的强度随着摩擦半径的增大而增大。相应地,摩擦半径的增大会显著增加摩擦片的磨损。划痕的宽度、深度和磨损量都会增加。在摩擦过程中,摩擦半径的增加会导致摩擦片磨损量的增加,同时也会导致大量磨损碎屑在界面处积聚,积极参与摩擦过程。因此,摩擦表面的退化变得越来越严重,并表现出复杂的摩擦学行为。摩擦半径的增大促进了摩擦系统中的模态耦合现象,在该系统中引发了高强度的不稳定振动。此外,摩擦半径越大,摩擦系统的结构越容易变形。当摩擦球随摩擦盘移动的幅度较大时,界面上的接触应力集中在切入端附近的区域会明显加剧,同时接触应力的数值也会增加。在摩擦半径较大的情况下,表面接触应力集中是摩擦盘上划痕的宽度、深度和磨损量增大的主要原因。我们建立的球盘摩擦系统 2-DOF 数值模型有效地帮助我们讨论了摩擦半径和摩擦系数(COF)对系统稳定性的影响。研究发现,在摩擦半径和摩擦系数较大的情况下,系统会表现出模态耦合现象,出现振动不稳定状态。摩擦诱导振动(FIV)的强度也随着摩擦半径的增大而增大。总之,本研究发现摩擦半径是影响 FIVN 的关键因素,应采取适当措施改善界面的摩擦学行为,以在遇到大摩擦半径时抑制 FIVN。
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
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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