载货汽车发动机飞轮壳加强筋布置的优化设计

Layout Optimization of Stiffeners for Engine’s Flywheel Housing of Trucks

论述了载货汽车发动机飞轮壳加强筋的布置优化设计。在布置优化过程中,以应力约束条件下加强筋的最小重量为目标函数,将加强筋布置在应变能(或应力)较高的位置。利用加强筋单元应变能灵敏度给出了飞轮壳加强筋优化位置的搜寻方法,即通过确定加强筋单元的使用效率来决定应该被删除的无效单元。在迭代设计过程中,应用一种高效的重分析方法提高了计算速度。该方法与传统设计方法相比,大大缩短了优化设计周期,提高了设计精度。

The layout optimization of stiffeners for engine flywheel housing of a truck was discussed. In the layout optimization, the minimum weight of stiffeners was taken as the objective function with the stress constrain, the stiffeners was placed at the locations with high energy(or stress). To identify the element and efficiency so that the inefficiently elements of stiffeners can be removed, the sensitivity of the strain energy of stiffeners was introduced, and a search criterion for locations of stiffeners was given. In each iterative design, a high efficiency reanalysis method was used to reduce computational effort. Compared with traditional optimization,the proposed method can greatly reduce optimization effort and improve design precision.