本文所研究的方法，对复杂机械产品的零件采购管理具有普遍意义。
The method studied in this thesis is of universal significance for the procurement management of complex mechanical products.
最后作为复杂机械产品的应用实例，建立了港口门座式起重机的CAD系统模型。
As an example, we build the model of the portal crane CAD system to verify the above techniques and criterions.
为了适应复杂机械产品优化设计，提出一种修正的单纯形法，并用来改进模拟退火算法。
In order to adapt to the optimization of the complex mechanical products, a new simplex method is presented. Then the simulated annealing algorithm is improved by using the new method.
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