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Numerical simulation of ferrofluid-lubricated rough elliptical contact with start-up motion

机译：与启动运动的铁物流体润滑粗椭圆粗椭圆接触的数值模拟

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摘要

As exotic magnetic colloids, ferromagnetic ferrofluids have excellent tribological characteristics for many applications in mechanical environments. The anti-wear issues of extremely unstable technological conditions such as frequent start-up motions is an intractable challenge. The strategy of employing ferrofluid lubrication in the start-up motion from ultra-low speed to operating speed is a potential approach to improving the severe wear of rough elliptical contact. This paper presents a revised mixed lubrication model that accounts for magnetic field circumstances. Considering Gaussian random roughness, time-varying effect, and thermal effect, the lubrication equations are numerically calculated. First, four start-up modes are evaluated and compared; then the differences between ferrofluids and base oil are quantitatively studied. Furthermore, the influences of ferromagnetic particle size and magnetic field intensity on the film formation and wear of rough elliptical contact are discussed. Results show that ferrofluid lubrication is of great significance in wear reduction compared with base oil. The start-up motion with high accelerated speed is advantageous in film lubrication and wear reduction. Additionally, decreases in ferromagnetic particle size and increases in magnetic field intensity satisfactorily enhance the anti-wear performance of rough elliptical contact.
机译：作为异国情调的磁性胶体，铁磁铁磁体具有优异的摩擦学特性，对于机械环境中的许多应用。频繁启动动作等极其不稳定的技术条件的抗磨损问题是一种难以应变的挑战。在超低速度到运行速度的初始动作中使用铁磁流体润滑的策略是提高粗糙椭圆接触的严重磨损的潜在方法。本文介绍了一个修订的混合润滑模型，占磁场情况。考虑到高斯随机粗糙度，时变效果和热效果，数值计算润滑方程。首先，评估四种启动模式并进行比较;然后定量研究了铁磁流体和基础油之间的差异。此外，讨论了铁磁性粒度对薄膜形成和粗椭圆接触磨损的影响。结果表明，与基础油相比，铁磁流体润滑具有重要意义。具有高加速速度的启动运动在薄膜润滑和磨损中是有利的。另外，降低铁磁粒度和磁场强度的增加令人满意地增强了粗糙椭圆接触的抗磨损性能。

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  • 来源
    《Applied Mathematical Modelling》 |2021年第3期|232-260|共29页
  • 作者

    Xingbao Huang; Xiao Zhang; Youqiang Wang;

  • 作者单位

    State Key Laboratory of Mechanical Systems and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China;

    State Key Laboratory of Mechanical Systems and Vibration School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China;

    School of Mechanical Engineering Qingdao University of Technology Qingdao 266033 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ferromagnetic ferrofluids; Mixed lubrication; Start-up; Magnetic field; Wear;

    机译：铁磁铁物质流体;混合润滑;启动;磁场;穿;

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