箱体结构动强度的流固耦合有限元分析

针对某型车辆综合传动变速箱箱体，进行了流固耦合数学表达式的推导，并建立了箱体与箱体内油液的流固耦合有限元模型。首先分析了油液高度对箱体模态的影响；其次分析了其所受的动载荷，并进行了有限元的数值仿真计算，应用第四强度理论对箱体的强度进行了分析；最后根据计算结果，对该箱体结构进行了有针对性的加筋强化并对强化后的箱体振动再进行计算。仿真计算结果表明：进行加筋处理后的箱体结构振动幅值和应力均能得到有效抑制。

Fluid-Structure Interaction Finite Element Analysis of Dynamic Structural Strength on Gearbox's Housing

The mathematical representation of fluid-structure interaction was deduced for a gearbox housing of composite transmission of a certain vehicle. And the fluid-structure interaction finite ele?ment model of a complex gearbox’s housing was built. The effect of the oil height on the modal of the housing was analyzed, the exciting forces of the housing were analyzed and applied to the model; the vibration of the housing was calculated by the model, and the strength of housing was analyzed by the fourth material strength theory; according to the calculated results, the housing was strengthened by reinforcing ribs and the vibration of the modified housing was calculated. The calculated results show that the stress and vibration amplitude of the modified housing are lower.