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The effect of the lubricated revolute joint parameters and hydrodynamic force models on the dynamic response of planar multibody systems

机译:润滑旋转接头参数和流体动力模型对平面多体系统动力响应的影响

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摘要

In this work a comprehensive methodology for dynamic modeling and analysis of planar multibody systems with lubricated revolute joints is presented. In general, this type of mechanical systems includes journal-bearings in which the load varies in both magnitude and direction. The fundamental issues associated with the theory of lubrication for dynamically loaded journal-bearings are revisited that allow for the evaluation of the Reynolds’ equation for dynamic regime. This approach permits the derivation of the suitable hydrodynamic force laws that are embedded into the dynamics of multibody systems formulation. In this work, three different hydrodynamic force models are considered, namely the Pinkus and Sternlicht approach for long journal-bearings and the Frêne et al. models for both long and short journal-bearings. Results for a planar slider-crank mechanism with a lubricated revolute joint between the connecting-rod and slider are presented and utilized to discuss the assumptions and procedures adopted throughout the present study. Different test scenarios are taken into account with the purpose of performing a comparative study for quantifying the influence of the clearance size, lubricant viscosity, input crank speed and hydrodynamic force model on the dynamic response of multibody systems with lubricated revolute joints. From the global results obtained from computational simulations, it can be concluded that the clearance size, the lubricant viscosity and the operating conditions play a key role in predicting the dynamic behavior of multibody systems.
机译:在这项工作中,提出了一种具有润滑旋转接头的平面多体系统动力学建模和分析的综合方法。通常,这种类型的机械系统包括轴颈轴承,其中载荷在大小和方向上均发生变化。讨论了与动态加载轴颈轴承润滑理论相关的基本问题,从而可以评估雷诺方程的动态状态。这种方法允许推导嵌入多体系统配方动力学中的合适流体动力定律。在这项工作中,考虑了三种不同的水动力模型,分别是用于长轴承的Pinkus和Sternlicht方法以及Frêne等人。多头和空头轴承的模型。提出了在连杆和滑块之间带有润滑的旋转接头的平面滑块-曲柄机构的结果,并用于讨论整个研究过程中采用的假设和程序。考虑到不同的测试方案,目的是进行比较研究,以量化间隙尺寸,润滑剂粘度,输入曲柄速度和流体动力模型对带润滑旋转接头的多体系统动力响应的影响。从计算仿真获得的整体结果可以得出结论,游隙尺寸,润滑剂粘度和工作条件在预测多体系统的动力学行为中起着关键作用。

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