从工程实际出发，引用一种折板结构代替板肋结构〔１〕，并应用折板结构的力学特性，建立了约束隐函数同几何设计变量的近似关系式．结合可行方向法的思想，提出一个不必对约束隐函数求偏导数，不必求解线性规划的优化算法，有效地解决了该类结构的拓扑可调优化问题．应用实例表明，算法的优化效果良好 Starting from the engineering practice, a folded plate structure was used instead of the plate rib structure [1], and the mechanical properties of the folded plate structure were applied to establish an approximate relationship between constrained implicit functions and geometric design variables. Combined with the idea of ​​the feasible direction method, an optimization algorithm that does not need to find the partial derivative of the constrained implicit function and does not need to solve the linear programming is proposed, and the topology-tunable optimization problem of this kind of structure is effectively solved. Application examples show that the algorithm has a good optimization effect