The connotation and characteristic of constraint in collaborative design of machine tool are analyzed. Conformation model of constraint network is demonstrated using EXPRESS-G.
分析了机床产品协同设计中约束的内涵和特点，并用EXPRESS - G图描绘了约束网络的结构模型。
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The algorithm makes use of the characteristic of Lagrange relaxation method, and finds multicast tree satisfying constraint by constructing closure graph and making relaxation to this graph.
The characteristic of the instantaneous stable structure is that the structure's freedom degree is equal to zero, but still the structure remains a redundant constraint.