6087

5696

كارشناسي ارشد

صنايع

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي صنايع

1389

دوازده،129ص.مصور: جدول، نمودار

ص.ع. به: فارسي و انگليسي

جمشيد پرويزيان، فرشاد تويسر كاني

29/4/90

بهروز ارباب شيراني، يداله ذاكري

مهندسي صنايع و سيستم ها

ID5696

به فارسي و انگليسي:قابل روئيت در نسخه ديجيتالي

Integrated Risk Analysis of Systems Based on Petri nets Analysis Abolfazl Doostparast Torshizi a doostparasttorshizi@in iut ac ir Date of Submission 22 01 2011 Department of Industrial and Systems Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors Jamshid Parvizian japa@cc iut ac ir Farshad Tooyserkani f tooyserkani@cc iut ac irAbstract Safety Engineering and its branches are undetachable elements of any systematic process in which there isan interaction between human and machine Also developments in systems modeling and analysis methodshave increased efficiency and maneuverability of safety engineering techniques One of such methods whichoriginates from modeling of discrete event systems is Petri net These nets have various kinds with differentcapabilities Hence incorporating them in reliability and safety problems makes them more flexible On theother hand because of static nature of many failure analysis methods and lack of dynamic techniques insafety science utilizing dynamic tools such as Petri nets seems to be inevitable In this thesis we consider three goals Firstly proposing a fuzzy risk analysis method based oncorrespondence of Stochastic Petri nets and Markov Chains secondly proposing a novel algorithm in orderto determine firing sequences of Petri nets and finally implementing concept of counters from linearsystems point of view in the field of sequential failure analysis In the first goal a novel ranking algorithmwhich is able to handle generalized trapezoidal fuzzy numbers was presented and its capabilities in coveringdrawbacks of existing approaches was proved Then on the basis of this algorithm and introduction of someefficient risk factors our novel dynamic risk analysis was proposed In the second goal according to lack of adocumented method in determination of firing sequences leading to sequential failures a set of algorithmswere presented and their precision was analyzed At the end in the third goal using DIOID algebra weanalyzed linear and nonlinear systems dominating connections in Petri nets and utilized its results incalculation of sequential failure probabilities Computational results of this method demonstrated a highreduction in computation complexity which proves capability of this technique It noteworthy to mention thatthe proposed algorithms in this research are comprehensive and can be used in other fields Results of theproposed methods demonstrate precision accuracy and ease of use in contrast with the existing techniques Keywords Failure Analysis Petri Nets Fuzzy Logic Risk Analysis

جمشيد پرويزيان، فرشاد تويسر كاني

بهروز ارباب شيراني، يداله ذاكري