摘要
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 flexible multibody dynamics theory, a flexible dynamical model for the simulation of a large marine diesel engine crankshaft is established through an in-house developed multibody procedure. In this model, the crankshaft is modelled by three dimensional solid elements based on the Absolute Nodal Coordinates Formulation （ANCF）, and the main journal is modelled by beam elements based on the Finite Segment Method. By using the constraint equations, parts of the engine linkage mechanism are assembled, and the flexibility and nonlinearity of the spindle bearing are also considered. The constrained modal analysis and dynamic analysis of the crankshaft system are performed. Consequently, the bearing load and the displacement of the journal is calculated. In addition, the crankshaft＇s dynamic stress distribution is obtained, and the strength verification is also carried out. These results show that the ANCF based flexible multibody dynamics modelling and the implementation of simulation can provide theoretical basis for improvement and design of diesel engine.
出处
《工程力学》
EI
CSCD
北大核心
2013年第6期281-287,共7页
Engineering Mechanics
基金
国家科技重大专项课题子课题(2008ZX05024-003-13)
关键词
柔性多体动力学
绝对节点坐标法
柴油机
曲轴
约束模态分析
动应力分析
flexible multibody dynamics
absolute nodal coordinate formulation
diesel engine
crankshaft
constrained modal analysis
dynamic stress analysis
