多体系统中不完全润滑轴颈轴承产生的动态载荷的精确解析解

IF 2.6 2区 工程技术 Q2 MECHANICS
Bassam J. Alshaer, Hamid M. Lankarani
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引用次数: 0

摘要

本研究提出了控制轴颈轴承润滑的雷诺方程的精确解析解,该解析解适用于无限长或无限短的轴承,基于所应用的侧漏条件。通过对压力分布解进行分析整合,可获得润滑剂在支持不完全轴颈轴承接头外部动载荷时产生的力。压力分布和润滑剂产生的力的分析解决方案已通过数值验证得到证实。该解决方案在两个不同的多体机械系统中得到了应用:一个系统包括通过润滑不完全轴颈轴承相互连接的两个机构,另一个是带有润滑不完全接头的传统曲柄滑块机构。对长轴颈轴承和短轴颈轴承都进行了结果演示。结果表明,侧漏的增加会减小接头两端的压力,扩大轴向压力梯度,进而提高偏心率,使润滑剂产生足够的流体动力来支持外部负载。当承受相同的外部动载荷时,短轴颈轴承的中心轴会划出一条轨迹,表现出明显的润滑油力过冲。与长轴颈轴承相比,短轴颈轴承由于侧漏增加而导致粘滞阻尼减小,从而产生了这种现象。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

An exact analytical solution for dynamic loads generated by imperfect lubricated journal bearings in multibody systems

An exact analytical solution for dynamic loads generated by imperfect lubricated journal bearings in multibody systems

This work presents a precise analytical solution of the Reynolds equation governing the lubrication of journal bearings, this solution is valid for either an infinitely long or an infinitely short bearing, based on the side leakage condition applied. The pressure distribution solution is analytically integrated to obtain the forces generated by the lubricant in supporting external dynamic loads in imperfect journal bearings joints. The analytical solution for both the pressure distribution and the forces generated by the lubricant has been corroborated through numerical validation. This solution was implemented on two distinct multibody mechanical systems: one comprising two bodies interconnected via a lubricated imperfect journal bearing, and the other being the conventional crank-slider mechanism with a lubricated imperfect joint. The outcomes are demonstrated for both long and short journal bearings. The results indicate that an increase in side leakage diminishes the pressure at the ends of the joints and amplifies the axial pressure gradient, which, in turn, elevates the eccentricity required to generate sufficient hydrodynamic forces from the lubricant to support the external load. When exposed to identical external dynamic loading, the central axis of a short journal bearing delineates a trajectory that manifests a pronounced lubricant force overshoot. This phenomenon arises from the diminished viscous damping in short journal bearings, attributable to increased side leakage, in contrast to their long journal bearing counterparts.

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来源期刊
CiteScore
6.00
自引率
17.60%
发文量
46
审稿时长
12 months
期刊介绍: The journal Multibody System Dynamics treats theoretical and computational methods in rigid and flexible multibody systems, their application, and the experimental procedures used to validate the theoretical foundations. The research reported addresses computational and experimental aspects and their application to classical and emerging fields in science and technology. Both development and application aspects of multibody dynamics are relevant, in particular in the fields of control, optimization, real-time simulation, parallel computation, workspace and path planning, reliability, and durability. The journal also publishes articles covering application fields such as vehicle dynamics, aerospace technology, robotics and mechatronics, machine dynamics, crashworthiness, biomechanics, artificial intelligence, and system identification if they involve or contribute to the field of Multibody System Dynamics.
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