Based on fully stressed criterion, a mathematical model for spring optimization design has been built. The model is a constrained nonlinear programming problem.
按满应力准则建立了弹簧优化设计的数学模型，它是一个有约束的非线性规划问题。
The fully stressed design criterion is approximate and the stress ratio algorithm must be used repeatedly.
满应力设计准则是近似的，同时必须循环运用应力比算法。
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