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针对某款轿车车身低阶弹性固有频率与原型车目标值存在偏差的实际问题,采用结构性能灵敏度分析方法和以往工作经验,筛选确定对车身扭转刚度、1阶扭转频率和1阶弯曲频率影响较大的部位。在此基础上,采用延长搭接边、增加板厚度、增加加强筋、翻边等处理方式,改进部件及其相关部件的结构,修正模型结合面特性参数。研究结果表明:改进后车身质量增加了7.6%,结构低阶固有频率得到明显地提高,1阶扭转频率增加了10%,1阶弯曲频率增加了2%。车身整体结构的刚度得到加强,弯曲刚度增加了1.5%,扭转刚度增加了8.6%,有效地改善了其综合力学性能,达到了原型车相关技术目标值的要求,为轿车车身的CAE分析和结构设计提供了可靠依据。
Aiming at the practical problem that a low-grade natural frequency of a car body is deviated from the target value of a prototype car, a structural sensitivity analysis method and previous work experience are used to determine the influence on torsional stiffness, first-order torsion frequency and first-order bending frequency of the car body Big parts. On the basis of this, the structure of the components and their related components are improved by modifying the overlapping edge, increasing the thickness of the slab, adding stiffeners and flanging, and modifying the parameters of the interface of the model. The results show that the body mass of the improved body increases by 7.6%, the natural frequency of the low-order structure obviously increases, the first-order torsional frequency increases by 10% and the first-order flexural frequency increases by 2%. The rigidity of the whole body structure is strengthened, the bending stiffness increases by 1.5% and the torsional stiffness increases by 8.6%, which effectively improves its comprehensive mechanical properties and meets the requirements of the target value of the prototype car related technology. The CAE analysis and structure of the car body Design provides a reliable basis.