多源动态激励下变速箱箱体结构的动态响应分析

Dynamic Response Analysis of Gearbox Housing Under Multi-source Dynamic Excitation

建立了变速箱箱体结构的动态有限元分析模型,对变速箱齿轮传动系统内外部动态激励进行分析和数值模拟,内部激励主要考虑齿轮时变啮合刚度、阻尼和误差,外部激励主要考虑发动机转矩波动、轴承时变刚度和阻尼;并对齿轮传动系统进行刚柔耦合多体动力学仿真分析,得到箱体各轴承座处的动态力,在此基础上利用模态叠加法对箱体结构进行了动态响应求解,并结合箱体的约束模态分析结果,在时域和频域上对箱体的动态响应特性进行了分析,结果表明:箱体结构设计比较保守,变速箱在使用中各响应幅值不大,不会引起共振,能满足使用要求。

A dynamic finite element model of gearbox housing is established.The internal and external dynamic excitations of gear transmission system are calculated by numerical simulation method,considering the gear time-varying meshing stiffness,damping and meshing error in the internal dynamic excitation,and the torque ripple of engine,bearing time-varying stiffness and damping in the external dynamic excitation.The dynamic forces of housing bearing seats are obtained by simulating and analyzed the rigid and flexible coupled multi-dynamics of inner gear transmission system.On this basis,the dynamic response analysis of housing is carried out using a mode superposition method,and according to the results of constrained modal analysis,the dynamic response characteristics of housing are studied in the time and frequency domains.The results show that the housing structure design is relatively conservative,the various response amplitudes are small so that the sympathetic vibration is not occurred in the use process,and it is sufficient for application requuirement.