To meet the requirements of passenger car fuel tank's vibration durability tests, we build a precisemodel to predict possible structural failure area, which meets the requirements that the constraint boundary doesnot lead to improper local stress and that model building is fast. By using the finite element software Hypermeshas the analysis tool, we establish fuel tank body connection holes model separately by full degrees constraints and 3 translational degrees constraints. By static analysis and transient response analysis, we predict structuredangerous areas. The simulation results show that the restrained 3 translational dofs connections coincide withthe weak region of the fuel tank. It provides a reliable basis for fuel tank's optimization and virtual test.%针对某乘用车燃油箱的振动耐久性试验要求,需满足约束边界不导致局部不合理应力和快速建模等条件,建立较高精度的仿真分析模型,预测可能产生结构失效的区域.采用有限元软件Hypermesh为分析工具,在燃油箱箱体连接孔处,分别建立了全约束连接和只约束3个平动自由度的约束连接,通过静态和瞬态响应分析油箱结构的应力较大区域.试验结果表明,产生的结构失效区域与只约束3个平动自由度约束连接的仿真分析结果相符,切实反应了燃油箱的薄弱区域,为后续产品结构优化及虚拟测试提供可靠的建模基础.
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