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为更准确地分析曲轴在运行工况下的动力学响应特性,采用Pro/E 3D软件对CA4D32柴油机曲轴、轴承等部件进行三维实体有限元建模,并将模型导入非线性多体动力学分析软件AVL Excite,添加连接单元,建立轴系非线性多体动力学模型,计算了一个工作循环的主轴承载荷变化.将非线性多体动力学轴系位移量计算结果作为曲轴三维实体有限元精细模型的载荷边界条件,完成了一个循环曲轴动应力计算.结果表明,与刚性体的分析方法相比较,采用非线性多体动力学分析方法可获得更接近实际的有限元模型的载荷边界条件,提高了曲轴强度的计算精度.
In order to analyze the dynamic response characteristics of crankshafts more accurately, Pro / E 3D software was used to simulate the crankshaft, bearing and other components of CA4D32 diesel engine by three-dimensional solid finite element method, and the model was imported into nonlinear multi-body dynamic analysis Software AVL Excite, the connection element is added to establish the nonlinear multi-body dynamics model of the shaft system, and the change of the main bearing load of a work cycle is calculated. The calculation result of the nonlinear multi-body dynamics shaft displacement is taken as the finite element refinement The load boundary condition of the model is obtained and the calculation of the dynamic stress of a cycle crankshaft is completed.The results show that compared with the rigid body analysis method, the load boundary conditions of a more realistic finite element model can be obtained by using nonlinear multibody dynamics analysis method, Improve the calculation accuracy of crankshaft strength.