بهینه‌سازی دوهدفه تخصیص افزونگی فعال در سیستم توزیع انرژی الکتریکی در یک شناور با در نظرگیری اشتراک بار و تعمیرکار واحد

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مدیریت و مهندسی صنایع، دانشگاه صنعتی مالک اشتر، اصفهان، ایران.

چکیده
هدف: هدف از پژوهش حاضر، یافتن چیدمان مناسب از نوع و تعداد تجهیزات جهت حداکثر نمودن قابلیت دسترسی و کاهش هزینه­‌ها با استفاده از استراتژی تخصیص افزونگی فعال با در نظر گرفتن امکان اشتراک‌گذاری بار و استفاده از نیروی تعمیرکار باسیاست نگهداشت و مرخصی در سیستم توزیع انرژی الکتریکی یک شناور است. در استراتژی فعال، تمام قطعات و اجزای اضافه‌شده به سیستم به‌صورت فعال از زمان شروع به کار سیستم مورداستفاده قرار می­‌گیرند و سیستم زمانی خراب می‌شود که تمام اجزا دچار خرابی شده باشند.
روش‌شناسی پژوهش: در پژوهش حاضر یک مدل دو هدفه برای سیستم توزیع انرژی الکتریکی با افزونگی فعال در یک شناور در نظر گرفته‌شده است که هدف اول آن هزینه کل و هدف دوم آن قابلیت دسترسی است. شبیه‌سازی رفتار سیستم با استفاده از زنجیره­ مارکوف و توزیع فاز نوع صورت گرفته و برای حل آن از الگوریتم ژنتیک چندهدفه NSGA-II) (استفاده گردیده است. خرابی یک تجهیز بر نرخ خرابی سایر تجهیزات زیرسیستم تاثیر می­‌گذارد و باعث افزایش نرخ خرابی می­‌گردد. به‌عبارت‌دیگر، مساله باحالت اشتراک­‌گذاری بار بررسی‌شده است. یک تعمیرکار نیز برای تعمیر تجهیزات در نظر گرفته‌ شده است. سیاست نگهداشت و مرخصی بدین گونه است که اگر در زمان مرخصی تعمیرکار، تجهیزی دچار خرابی شود، مرخصی تعمیرکار پایان‌یافته و تعمیر تجهیز خراب آغاز می­‌گردد. در زمان تعمیر تجهیز خراب نیز اگر تجهیز دیگری دچار خرابی شود، می­‌بایست در صف تعمیر قرار گرفته و تعمیرکار بلافاصله پس از اتمام تعمیر تجهیز خراب پیشین، تعمیر تجهیز خراب بعدی را آغاز نماید. زمانی که تعمیرکار در مرخصی است، اگر هیچ تجهیزی دچار خرابی نشود، تعمیرکار می­‌تواند مجددا به مرخصی برود.
یافتهها: نتایج حاصل از پژوهش، بهترین ترکیب نوع و تعداد تابلوهای توزیع انرژی الکتریکی در هر زیرسیستم از سیستم توزیع انرژی الکتریکی شناور را جهت افزایش قابلیت دسترسی و کاهش هزینه­‌ها با استفاده از افزونگی فعال نشان داده است. همچنین میزان احتمال کار تعمیرکار را جهت اتخاذ تصمیمات مدیریتی در جهت سیاست­‌های نگهداشت و مرخصی نشان داده است.
اصالت/ارزش‌افزوده علمی: با توجه به نوآوری تحقیق، نتایج حاصل از پژوهش می‌­تواند جهت تحلیل­‌های مهندسی به لحاظ بررسی قابلیت دسترسی و جهت تحلیل­‌های مدیریتی در برآورد هزینه­‌ها و تخصیص نیروهای تعمیراتی مفید واقع شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Bi-objective optimization of active redundancy allocation in the electrical power distribution system of a marine vessel considering load sharing and a single repairman

نویسندگان English

Maryam Ganji
Mehdi Karbasian
Department of Industrial Management and Engineering, Malek Ashtar University of Technology, Isfahan, Iran.
چکیده English

Purpose: The objective of the present study is to determine an optimal configuration in terms of the type and number of components in order to maximize system availability and reduce costs, using an active redundancy allocation strategy, while considering load-sharing capability and the use of maintenance personnel under maintenance and leave policies, in the electrical power distribution system of a marine vessel. In the active redundancy strategy, all additional components and subsystems are operated simultaneously from the start of system operation, and the system fails only when all components have failed.
Methodology: In this study, a bi-objective model is developed for an electrical power distribution system with active redundancy in a marine vessel, where the first objective is minimization of total cost and the second objective is maximization of system availability. System behavior is simulated using a Markov chain and a phase-type distribution, and the model is solved using the Non-dominated Sorting Genetic Algorithm II (NSGA-II). Failure of one component affects the failure rates of other components within the same subsystem, leading to an increase in their failure rates. In other words, the problem is analyzed under a load-sharing condition. A single repairman is considered for equipment repair. The maintenance and leave policy is defined such that if a component fails during the repairman’s leave period, the leave is terminated and repair of the failed component begins immediately. If another component fails while a component is under repair, it is placed in a repair queue, and the repairman starts repairing the next failed component immediately after completing the repair of the previous one. When the repairman is on leave and no component failure occurs, the repairman may resume the leave period.
Findings: The results of the study identify the optimal combination of the type and number of electrical power distribution panels in each subsystem of the vessel’s electrical power distribution system, aimed at increasing system availability and reducing costs through the use of active redundancy. In addition, the results provide the probability of the repairman being busy, which can support managerial decision-making regarding maintenance and leave policies.
Originality/Value: Considering the innovative aspects of the study, the results can be effectively used for engineering analyses, particularly in evaluating system availability, as well as for managerial analyses, including cost estimation and the allocation of maintenance personnel.

کلیدواژه‌ها English

Active redundancy allocation strategy
Load-sharing
Markov chain
Availability
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