车辆动力传动系统弯扭耦合振动模型的建立及复模态分析

Construction of Bending-torsional Coupled Vibration Model and Complex Modal Analysis of the Vehicle Powertrain

以某履带车辆的多轴齿轮动力传动系统为研究对象,按照一定的简化原则建立多自由度的弯扭耦合振动力学模型,并针对弯扭耦合振动力学模型的特点,利用有限元理论与数学模型的相结合,在ANSYS中建立考虑齿轮的啮合刚度和啮合阻尼,以及轴承的支承刚度和油膜阻尼的有限元模型,对有限元模型进行有阻尼的复模态计算,并对弯扭耦合振动特性进行分析。探讨耦合模态中的振动形式以及模态参与因子和有效质量,研究齿轮时变啮合刚度和啮合阻尼对多轴齿轮动力传动系统弯扭耦合振动模态的影响情况。对齿轮传动系统进行弯扭耦合振动台架试验,将试验数据与仿真计算结果进行对比,验证了有限元模型的正确性,为进一步的动力学分析奠定了基础。

The multi-axle gear powertrain of a certain tracked vehicle.Firstly the mechanical model of multi-DOF bending-torsion coupled vibration is established according to a certain simplification principle,and based on the characteristic of the mechanical model,the finite element model of the system is established in ANSYS by combining the bending-torsion coupled vibration mathematic model and the finite element theory which takes into account the mesh stiffness and damping of the gear,and the supporting stiffness and oil film damping of the bearing.Complex modal calculation of the damped finite element model is carried out,and the characteristic of bending-torsion coupled vibration is analyzed.The vibration form,modal participation factor and effective mass of the coupled modal are discussed.The influence of time-varying mesh stiffness and mesh damping on the vibration modal is researched.At last the bending-torsion coupled vibration bench test is carried out for the gear system.The comparison between test data and simulation calculation result verifies the correctness of the finite element model,which lays the foundation for further dynamic analysis.