作者在一般压力级的级和级组的优化设计、决策分析基础上,根据双列速度级区别于一般压力级的特点,将双列速度级的设计表述为一个以设计工况内效率为目标的多变量(共十个)有约束(共十类五十四个)非线性规划问题,用SUM外点法将有约束化为无约束问题,然后由Sargent—Powell算法借助于抛物线拟合一维搜索求解。算例表明,提出的模型是合理的,优化的效果是显著的。 Based on the optimization design and decision-making analysis of the general pressure level and level group, the author designs the design of double-line speed stage as a design efficiency based on the characteristics of double-speed stage different from the general pressure level (A total of ten) with a total of ten (fifty-four) nonlinear programming problems were constrained to be unconstrained by the SUM of SUM. Then the Sargent-Powell algorithm was fitted with a parabola Dimensional search solution. The example shows that the proposed model is reasonable and the effect of optimization is significant.