基于有限元的汽车变速器耦合系统动力学分析

利用三维实体单元、弹簧阻尼单元和耦合矩阵单元的混合有限元方法建立了某型汽车变速器有限元实体模型,对三档下的变速器传动系统和总成进行了模态分析;对包括斜齿时变啮合刚度、冲击和误差激励在内的两个内部激励作用下的变速器传动系统耦合模型动态响应进行了计算.结果表明,三档特定工况下变速器不会发生共振;耦合系统振动响应频谱成分存在分频、倍频及调制频率成分,振动响应表现出多周期的非线性特性.该研究为变速器的噪声分析和优化设计打下基础.

Dynamic Characteristics Analysis Based on Finite Element for Automotive Transmission Coupling System

The finite element solid model of transmission was established by using the mixed finite element method of three-dimensional solid,spring-damper and coupling matrix elements,and the modal analysis of the transmission drive system and assembly was done below the third gear.The dynamic responses of the gear transmission system were computed under gear tooth time-varying stiffness,impact and manufacturing error excitations.The results showed that the transmission did not produce resonances under the specific condition of the third gear.There were many frequency components,such as fractional,double and modulation frequencies.The vibration responses displayed multi-period nonlinear characteristics.The research results may make a good foundation for the noise analysis and optimum design of the transmission.