Dynamics and lubrication analyses of a planar multibody system with multiple lubricated joints
Dynamics and lubrication analyses of a planar multibody system with multiple lubricated joints
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DOI：
10.1177/1350650117713891
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
Bo Zhao;Yi Cui;Youbai Xie;Kun Zhou
中科院分区：
文献类型：
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作者：
Bo Zhao;Yi Cui;Youbai Xie;Kun Zhou
为了确保机械系统有更好的性能，它们的大多数连接都设计成使用润滑剂。不同位置的润滑接头相互作用，影响系统的总体性能。提出了一种考虑多个润滑关节间相互作用的多体系统建模方法，研究了该机构的动力学和摩擦学性能。该方法将平动关节和转动关节的润滑模型与多体系统动力学模型耦合起来，并在一台具有润滑活塞裙衬子系统和润滑连杆大端轴承的四冲程汽油机上进行了仿真。采用拉格朗日法建立了多体动力学模型。基于平均雷诺方程建立了润滑模型，并采用有限元法求解，根据系统的运动得到了流体动力。计算中考虑了活塞裙部型线、销轴偏心距以及表面粗糙度对润滑性能的影响。仿真结果表明，不同润滑位置的关节之间存在明显的相互作用，较大的间隙可以突出这种相互作用。
In order to ensure the mechanical systems a better performance, most of their joints are designed to operate with lubricant. The differently located lubricated joints interact with each other, influencing the total performances of the system. This study proposes a numerical approach for the multibody system modeling with the consideration of the interactions among the multiple lubricated joints to investigate the dynamics and tribological performances of the mechanism. This approach couples the lubrication model of both translational and revolute joints with the dynamics model of the multibody system, and is performed on a four-stroke gasoline engine with the lubricated piston skirt-liner subsystem and lubricated big-end bearing of the connecting rod. The multibody dynamics model is built with Lagrange’s method. The lubrication models are built based on the average Reynolds equation, and solved with finite element method to derive the hydrodynamic forces according to the motion of the system. The piston skirt profile, pin offset and the effects of surface roughness on the lubrication performances are taken into account. The simulation results reveal that there are obvious interactions between the differently located lubricated joints, and the larger clearance can pronounce the interactions.