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为将三维拓扑优化技术应用于发动机气缸体轻量化设计中,对采用变密度拓扑优化方法的拓扑优化技术进行了研究.以缸体上施加最大爆发压力工况为边界条件,以缸体总柔度最小化为优化目标,以缸体重量为约束条件,对缸体进行拓扑优化.拓扑优化后的结构考虑加工、装配等因素,进行合理的重新建模后,分析了最大爆发压力工况和最大侧向力工况的气缸体应力分布,两种工况下优化后的缸体最大应力比原气缸体降低,应力分布更加均匀.结构优化方法用于缸体的等强度轻量化设计中,很容易确定缸体的最佳形状,并能减少重复设计验证的次数.
In order to apply the three-dimensional topology optimization technology to the lightweight design of engine cylinder block, a topology optimization technique based on variable density topology optimization method is studied.Using the condition of maximum burst pressure on the cylinder as the boundary condition, The degree of minimization is the optimization objective, and the cylinder body weight is used as the constraint condition to optimize the structure of the cylinder.After the topology optimization, considering the factors such as machining and assembly, reasonable re-modeling, the maximum explosion pressure condition and The maximum lateral stress conditions cylinder body stress distribution, under the two conditions optimized cylinder maximum stress lower than the original cylinder body, the stress distribution more uniform structure optimization method for the cylinder of the same strength and lightweight design, It is easy to determine the best shape of the cylinder and reduce the number of repeated design verifications.