中文摘要：

在模糊Petri网的基础上定义了一类含闭环结构的模糊Petri网,以刻画实际系统的循环过程,对闭环结构给出了可持续性的定义以及闭环结构可持续的判定定理,并定义了闭环的传输度,作为刻画闭环循环运行能力的数值指标,最后通过实例阐述传输度的计算过程。

英文摘要：

A class of Fuzzy Petri Net with closed-loop structure is proposed, which can be used in circulation analysis of the actual systems. This paper is an attempt to provide the definition of sustainability and gives a theorem to determine its sustainability. The transmission degree of the closed-loop is also defined as a numerical index to measure the circulation ability of the closed-loop. Finally, an example is provided to illustrate the computation of transmission degree.