内燃机系统动力学与油膜动力润滑的耦合分析.pdfVIP

2003 年 MSC.Software 中国用户论文集 内燃机系统动力学与油膜动力润滑的耦合分析 戴旭东 袁小阳 谢友柏 西安交通大学润滑理论及轴承研究所 - 1 - 2003 年 MSC.Software 中国用户论文集 内燃机系统动力学与油膜动力润滑的耦合分析 Study on Coupling Hydrodynamic Lubrication to System Dynamical Behavior in Internal-Combustion Engine 戴旭东 袁小阳 谢友柏 (西安交通大学润滑理论及轴承研究所) 摘 要: 本文使用MSC.ADAMS 建立了内燃机缸体-活塞-连杆-曲轴系统的系统动力学分析 模型。在忽略油膜润滑情况下进行了内燃机缸体-活塞-连杆-曲轴系统的动力学分析，得到 了内燃机在转速稳定和启动过程中各构件的运动及受力情况。在系统动力学分析中考虑了曲 轴主轴承的流体动力润滑作用，建立了内燃机系统动力学与流体动力润滑耦合作用下的动力 学分析模型。通过在MSC.ADAMS 中调用自己编写的计算流体动力润滑程序进行了系统动力学 与流体动力润滑耦合作用下的动力学分析。分析结果表明：零部件在动态加速过程中要承受 比稳态时更大的载荷。在内燃机缸体-活塞-连杆-曲轴系统动力学分析中考虑油膜动力润滑 作用后缸体的动态受力峰值降低，润滑油膜的动力耦合具有使缸体各部位受力趋于均匀化的 作用。以不考虑油膜动力耦合作用的动力学分析作为设计依据的零部件设计具有过大的安全 裕度,在内燃机零部件设计时考虑摩擦学与系统动力学的耦合是必要的。 关键词: MSC.ADAMS 内燃机 系统动力学 润滑 动力耦合 Abstract: A multi-body dynamics model of Cylinder-Piston-Rod-Crank System (CPRCS) in Internal-Combustion (IC) engine was built with MSC.ADAMS. The numerical simulations of the model were processed in two conditions of stable rotation and startup. The result shows that the maximal forces acting on parts under startup is more than that of stable rotation. An analysis model of coupling bearing hydrodynamic lubrication to system dynamic behavior in CPRCS was established, and the numerical simulation of the model was presented through linking FORTRAN program to MSC.ADAMS. In the simulation, the oil film forces in bearings were computed by solving Reynolds differential equations. After a simulation of five circles, the dynamic forces acting on engine block were received. By contrasting with the results of a model - 2 - 2003 年 MSC.Software 中国用户论文集 neglecting bearing lubrication, it is evident that the coupling between system dynami