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建立某SUV车架的有限元模型,对车架进行弯曲刚度、扭转刚度和模态分析,并进行车架的弯曲和扭转刚度测试,测试结果验证了有限元模型的准确性。按照质量敏感度因子排序确定车架主要构件的优化对象,包括零件料厚和纵梁截面尺寸,并建立多目标优化模型。在提升弯扭刚度和低阶频率达到设计目标的同时,降低车架的总质量,达到轻量化设计的目标。
The finite element model of an SUV frame was established. The bending rigidity, torsional stiffness and modal analysis of the frame were measured. The bending and torsional stiffness of the frame were tested. The test results validated the accuracy of the finite element model. According to the mass sensitivity factor sorting, the optimal object of the frame main components, including the part thickness and the cross-sectional dimension of the stringer, is established and a multi-objective optimization model is established. In improving the bending stiffness and low-order frequency to achieve the design goals, while reducing the overall mass of the frame, to achieve the goal of lightweight design.