摘要
基于多体系统动力学理论,建立了纯电动汽车两挡变速器的多刚体系统动力学模型,计算了输入级齿轮副的动态啮合力和啮合频率,对传动轴和齿轮等部件进行柔性化处理,形成刚柔耦合系统动力学模型,得到齿轮副啮合力的周期性变化和轴承支反力.采用模态叠加法对变速器箱体进行振动响应分析,以轴承支反力为激振力,建立模态-瞬态时域、模态-谐响应频域有限元分析模型,得到箱体时域和频域下变化响应曲线.结果表明:刚柔耦合模型的齿轮副动态啮合力和输出轴转速曲线幅值波动较小,更接近理论值.齿轮副动态啮合力、轴承动态支反力和箱体动态响应频域曲线的峰值均出现在齿轮副的啮合频率及其倍频处,箱体的振动主要集中在输入端轴承座处.
Based on the theory of multibody system dynamics,a multibody system dynamics model for the two-speed transmission of a pure electric vehicle was established.The dynamic meshing forces and meshing frequencies of the input gear pair were calculated.Components such as the transmission shafts and gears were subjected to flexibilization to form a rigid-flexible coupling system dynamics model,which allowed for the acquisition of periodic variations in the meshing forces of the gear pair and the bearing reaction forces.Modal superposition method was employed to analyze the vibration response of the transmission housing.With the bearing reaction forces serving as the excitation forces,finite element analysis models in modal-transient time domain and modal-harmonic response frequency domain were established,yielding response curves in both time and frequency domains for the housing.The results indicate that the dynamic meshing forces of the gear pair and the amplitude fluctuations of the output shaft speed curve in the rigid-flexible coupling model exhibit minimal deviations and are closer to theoretical values.Peaks in the dynamic meshing forces of the gear pair,dynamic bearing reaction forces,and dynamic response frequency domain curves of the housing all occur at the meshing frequencies and their harmonics of the gear pair.The vibrations of the housing are primarily concentrated at the bearing pedestal on the input end.
作者
孙志豪
陈克
SUN Zhihao;CHEN Ke(School of Automotive and Transportation,Shengyang Ligong University,Shenyang 110159,China)
出处
《车辆与动力技术》
2025年第1期34-39,54,共7页
Vehicle & Power Technology
关键词
变速器
多体系统动力学
刚柔耦合
模态叠加
振动响应
transmission
multibody system dynamics
rigid-flex coupling
modal superposition
vibration response
