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针对并行工程的并发特性，讨论了相应的虚拟制造技术应采用的制模技术，探讨了图形制模分析技术——Ｐｅｔｒｉｎｅｔ图用于并发系统制模，以构筑并行工程虚拟制造环境的应用原理和技术。
According to the concurrency characteristics of concurrent engineering, the corresponding modeling technology of virtual manufacturing technology is discussed. The paper discusses the application principle of graphics modeling analysis technology - Petrinet graph for concurrent system modeling to build parallel engineering virtual manufacturing environment and technology.