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该文基于柔性多体动力学理论,在自主研发的多体系统程序中,建立了某大型船用柴油机曲轴的柔性多体动力学仿真模型。其中采用基于绝对节点坐标的三维实体单元和基于有限段法的梁单元分别对曲柄和主轴颈进行建模,利用约束方程将发动机曲柄连杆机构的各部件进行组装,并考虑了轴承的弹性和非线性。对曲轴进行了约束模态分析和动力学仿真分析,计算了主轴承的载荷和轴颈的位移,得到了曲轴的动应力分布规律并进行了其强度校核。结果表明基于绝对节点坐标法的柔性多体系统的动力学建模和仿真计算的实现为柴油机的改进和设计提供了理论依据。
Based on the theory of flexible multibody dynamics, a flexible multi-body dynamics simulation model of a large marine diesel engine crankshaft is established in a self-developed multi-body system program. The three-dimensional solid element based on the absolute node coordinates and the beam element based on the finite segment method are respectively used to model the crankshaft and the main journal. Constraint equations are used to assemble the components of the crankshaft connecting rod mechanism, taking into account the bearing flexibility and Nonlinear. The constrained modal analysis and dynamic simulation analysis of the crankshaft were carried out. The load of the main bearing and the displacement of the journal were calculated. The dynamic stress distribution of the crankshaft was obtained and its strength checked. The results show that the realization of dynamic modeling and simulation of flexible multibody system based on the absolute node coordinate method provides a theoretical basis for the improvement and design of diesel engine.