ارائه روشی سیستماتیک برای تحلیل حساسیت سیستم‌های تحمل‌پذیر خطا در معماری افزونگی چند ماجولی
الموضوعات :
کوروش اصلان صفت
1
(دانشگاه شهید بهشتی، تهران)
غلامرضا لطیف شبگاهی
2
(دانشگاه شهید بهشتی، تهران)
الکلمات المفتاحية: حساسیت, درخت عیب, افزونگی, معماری NMR,
ملخص المقالة :
درخت عیب یک دیاگرام سلسله مراتبی است که راههای مختلف ترکیب اجزای معیوب یک سیستم را که منجر به وقوع عیب نامطلوب مشخص در آن می‌شوند به تصویر می‌کشد. این دیاگرام در فازهای طراحی و بهره‌برداری سیستم‌های صنعتی به کار رفته و به طراحان امکان ارزیابی ویژگی‌هایی نظیر قابلیت اطمینان، میانگین زمان تا خرابی و حساسیت را عرضه می‌کند. علاوه بر موارد مذکور از درخت عیب برای پیدا کردن گلوگاه‌های خرابی و تعیین نقاط ضعف طراحی استفاده می‌کنند. علیرغم کاربردهای وسیع آن در ارزیابی قابلیت اطمینان سیستمها، از درخت عیب کمتر برای محاسبه حساسیت استفاده شده است. در دهه اخیر تحقیقات محدودی در این زمینه صورت گرفته است، اما این روش‌ها برای سیستم‌های بزرگ کارایی نداشته و نظام‌مند نیستند. مقاله حاضر به ارائه روشی سیستماتیک برای ارزیابی حساسیت سیستم‌های تحمل‌پذیر خطا از روی درخت عیب آن می‌پردازد. سپس روش فوق را برای محاسبه حساسیت معماری NMR که یکی از ساختارهای متعارف تحمل‌پذیری‌خطا که جهت افزایش قابلیت اطمینان، ایمنی و دردسترس‌پذیری سیستم ها در صنعت است، به کار گرفته و به ارائه فرمولی جامع و پارامتری برای محاسبه حساسیت این ساختار می‌پردازد. روش ارائه شده می‌تواند کمک شایانی به مهندسان طراح و بهره‌بردار سیستم‌های مطمئن برای محاسبه سیستماتیک و سریع حساسیت از روی درخت عیب آنها بنماید
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