Abstract    A discrete event system (DES) is a dynamic system that evolves in accordance with the abrupt occurrence, at possibly unknown irregular intervals, of physical events. Because of the special nature of these systems, different tools are currently used for their analysis, design and modeling. The main focus of this paper is the presentation of a new modeling approach of Discrete Event Systems. The proposed approach is based on hybrid model which combines Interval Constrained Petri Nets (ICPN) and Timed Automata. These tools allow us to evaluate, respectively, the quality variations and to manage the flow type disturbance. An example analysis illustrates our approach.

Keywords    Modeling, Petri Nets, Timed Automata, Interval Constraint Petri Nets, Robustness

چکیده    سیستم رویدادگسسته (DES) یک سیستم پویاست که احتمالاً با وقوع ناگهانی وقایع فیزیکی ناشناخته در فواصل نامنظم، تکامل می‌یابد. به دلیل ماهیت ویژه این سیستم ها، در حال حاضر از ابزارهای مختلف برای تجزیه و تحلیل، طراحی و مدل‌سازی آنها استفاده می‌شود. تمرکزاصلی این مقاله ارائه روش مدل‌سازی سیستم‌های رویداد گسسته است. روش ارائه شده مدل ترکیبی از فاصله‌ی محدود پتری شبکه‌ها (ICPN) و آتوماتای به‌هنگام (timed automata)است. این ابزار به ما اجازه می‌دهد تا به ارزیابی تغییرات کیفیت و مدیریت نوع اختلال جریان بپردازیم. تحلیل این رویکرد را با یک مثال نشان می‌دهیم

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