基于动态仿真的副变速器箱体有限元分析

针对副变速器的破坏情况，在各个不同的工况下，对其进行动态分析，并建立动力学模型。根据通过计算得出的主变速器输出轴输出转速、径向跳动量以及水平跳动量来验证模型的正确性。在低速重载工况下，得出副变速箱箱体结构点的瞬态受力曲线，并以此曲线作为后续瞬态有限元分析的载荷输入。对副变速器箱体分别进行模态和瞬态的有限元分析，得出副箱箱体的各阶固有频率、等效应力云图，确定箱体的结构危险点，从而得出结构危险点的瞬态应力曲线、变形曲线。提出箱体结构的改进方案，并把改进方案与原方案进行对比分析，验证改进方案的合理性。改进后的产品已通过机械标准JB／T8582．3—2001台架试验。

Finite element analysis of sub-transmission case based on dynamic analysis

According to the damage of the sub-transmission, the dynamic model was set up under different conditions. For validating the dynamic model, the output speed, radial runout, horizontal runout were obtained about the power takeoff of the transmission. Then under the low speed condition, the force curves of the bearing were obtained and used as the load for the finite element transient analysis. In the finite element analysis, the modal and transient analyses for the subtransmission case were made, the natural frequency and the cycling stress were acquired, then the fracture parts were pointed out, and their stress curves were obtained. The improvement on structure of case was proposed. After being compared with the prototype, the result shows its rationality. The improved product passed the bench test of JB/T8582.3-2001.