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Reliability and Safety Modelling in Reliable Systems Supported with Cold Standby Spares by a Markov Model | ||
| Advances in Industrial Engineering | ||
| مقاله 11، دوره 49، شماره 2، دی 2015، صفحه 273-285 اصل مقاله (1002.79 K) | ||
| نوع مقاله: Research Paper | ||
| شناسه دیجیتال (DOI): 10.22059/jieng.2015.57064 | ||
| نویسندگان | ||
| Golam Reza Latif Shabgahi* ؛ Koorosh Aslansefat؛ Mahdi Bahar Gogani | ||
| Department of Electronic and Computer Engineering, Shahid Beheshti University, Tehran, Iran | ||
| چکیده | ||
| Fault tolerance is one of the important issues in industries, such as transportation, military, chemical and nuclear sectors. Reliability and safety are two vital attributes of fault tolerant systems, and redundancy is a common way to improve these parameters. This article studies the impact of including cold standby spares in system architecture. To do this, it uses the Markov model of the system due to its capabilities in incorporating and modeling of priorities, functional dependencies, timing relations, reconfiguration issues and events sequences, existed in the system dynamic. The previous studies in the domain of reliable and fault tolerant systems have not presented general formulas to evaluate the reliability and safety of systems supported with cold spares. This article presents closed formulas for these attributes by which the impact of the number of spares, failure rate of modules, coverage factor, and switch quality can be studied on the system performance. | ||
| کلیدواژه‌ها | ||
| Active redundancy؛ Cold standby spare؛ Markov model؛ reliability؛ Safety | ||
| عنوان مقاله [English] | ||
| فرمول‌بندی قابلیت اطمینان و ایمنی در سیستم‌های مطمئن پشتیبانی‌شده با رزرو سرد به‌کمک مدل مارکوف | ||
| نویسندگان [English] | ||
| غلامرضا لطیف شبگاهی؛ کوروش اصلان صفت؛ مهدی بهار گوگانی | ||
| استادیار گروه کنترل و ابزار دقیق دانشگاه شهیدبهشتی | ||
| چکیده [English] | ||
| یکی از مباحث مهم در صنایع مختلف، اعم از حمل‌ونقل دریایی، هوایی، نظامی، شیمیایی و هسته‌ای، تحمل‌پذیری آن‌ها درمقابل عیوب و خطاهاست. از جملة مهم‌ترین ویژگی‌های یک سیستم تحمل‌پذیر عیب می‌توان به قابلیت اطمینان و ایمنی بالا در آن اشاره کرد. یکی از روش‌های مرسوم برای افزایش این دو ویژگی، استفاده از افزونگی در ساختار سیستم‌هاست. این پژوهش، تأثیر رزرو سرد بر افزایش قابلیت اطمینان و ایمنی سیستم را بررسی می‌کند و برای این کار، از مدل مارکوف بهسبب جامعیت و قابلیت آن در مدل‌سازی اولویت، وابستگی عملیاتی و زمانی، ریکاوری و ترتیب و توالی سیستم‌ها بهره میگیرد. در پژوهشهای پیشین، برای قابلیت اطمینان و ایمنی سیستم رزرو سرد، فرمولی کلی ارائه نشده است. این پژوهش با استفاده از مدل مارکوف سیستم رزرو سرد، رابطه‌ای برای دو ویژگی اتکاپذیری مذکور ارائه میدهد و از طریق آن‌ها تأثیر تعداد رزروها، میزان خرابی آن‌ها، کیفیت کار و سازوکار سوئیچ را در عملکرد سیستم بررسی می‌کند. | ||
| کلیدواژه‌ها [English] | ||
| افزونگی, ایمنی, رزرو سرد, قابلیت اطمینان, مدل مارکوف | ||
| مراجع | ||
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