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Article
The superiority of fuzzy exponential faimly distributions in measuring the reliability of the machines
افضلية توزيعات العائلة الاسية الضبابية في قياس معولية المكائن

Authors: Adnan Shamkhi Jaber عدنان شمخي جابر --- Safa Fahm Talal صفا فاهم طلال
Journal: Journal of Al-Qadisiyah for Computer Science and Mathematics مجلة القادسية لعلوم الحاسوب والرياضيات ISSN: 20740204 / 25213504 Year: 2018 Volume: 10 Issue: 1 Pages: 6-18 Stat
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

The study of the efficiency of the reliability of systems or productive systems in scientific life has a significant and important role in the scientific and technological development of these systems. This study deals with the superiority of mass fuzzy exponential distributions (exponential, wibble, kama, natural logarithmic) in measuring the reliability of the machines of the successive system. The applied study included data taken from the Diesel Station north of Diwaniyah, which is the time of failure and taken to a single block consisting of five machines operating respectively. The most important results of the study are that the data follow the distributions of the mass fuzzy exponential and the best distribution is the natural distribution logarithmic as the owner of the highest reliability as it turns out that the machines decreased significantly and largely because of the lack of preventive maintenance of these machines because of lack of equipment backup materials as a result of the austerity policy as well as the poor fuel used in operation.

يدرس البحث قياس المعولية الضبابية كما تناول ايضا دراسة افضلية توزيعات العائلة الاسية الضبابية (الاسي، ويبل، كاما، الطبيعي اللوغارتيمي) في قياس معولية النظام المتتالي.وقد اشتملت الدراسة التطبيقية على بيانات تم اخذها من محطة ديزل شمال الديوانية وهي عبارة عن أوقات الفشل والمأخوذة لبلوك واحد مكون من خمس مكائن تعمل على التوالي.وتمثلت اهم نتائج الدراسة ان التوزيع الطبيعي اللوغارتمي هو افضل توزيع من بين توزيعات العائلة الاسية الضبابية، اذ يُعد التوزيع هو التوزيع صاحب اعلى معولية. وان الماكينات انخفضت معوليتها وبشكل كبير مع تزايد معدل العطل بسبب عدم اجراء ادامة لهذه الماكينات بسبب قلة التجهيزات بالمواد الاحتياطية نتيجة لسياسة التقشف المتبعة بالإضافة الى رداءة الوقود المستعمل في التشغيل.


Article
Fuzzy Reliability-Vulnerability for Evaluation of Water Supply System Performance.

Authors: S. A. Mutlag --- A. H. Kassam
Journal: Anbar Journal of Engineering Sciences مجلة الأنبار للعلوم الهندسية ISSN: 19979428 Year: 2019 Volume: 8 Issue: 1 Pages: 72-82
Publisher: University of Anbar جامعة الانبار

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Abstract

The reliability of water supply system is a critical factor in the development and the ongoing capability to succeed in life and people's health. Determining of its, with high certainty, for performance of water supply system is developed to ensure the sustainability of system. Reliability (Re) plays a great role in evaluation of system sustainability. The probability approaches have been used to evaluate the reliability problems of systems. The probability approach is failed to address the problems of reliability evaluation that comes by subjectivity, human inputs and lack of history data. This research proposed two models; I) traditional model: fuzzy reliability measure suggested by Duckstein and Shresthaand then developed by El-Baroudy; and II) developed model: fuzzy reliability-vulnerability model. The two models implemented and evaluation of water supply system by using two hypothetical systems (G and H). System (G) consists of a single pump and System (H) consists of a two parallel pumps. Triangular and trapezoidal membership functions (MFs) are used to investigate of the reliability measure to the form of the membership function. The results agree with expectations that the reliability of parallel component system {ReH (0.53)} is higher than the reliability of single component system {ReG (0.47)}. Moreover, the result by using fuzzy set reduces the effect of subjectively in process of decision-making (DM). The fuzzy reliability vulnerability is able to handle different fuzzy representations and different operation environment of system


Article
Fuzzy logic in the estimate of reliability function for k - components systems
المنطق الضبابي في تقدير دالة معولية الأنظمة لـ من المركبات

Authors: انتصار عريبي فدعم --- ليث فاضل سيد حسين
Journal: journal of Economics And Administrative Sciences مجلة العلوم الاقتصادية والإدارية ISSN: 2227 703X / 2518 5764 Year: 2016 Volume: 22 Issue: 87 Pages: 391-404
Publisher: Baghdad University جامعة بغداد

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Abstract

One of the important things provided by fuzzy model is to identify the membership functions. In the fuzzy reliability applications with failure functions of the kind who cares that deals with positive variables .There are many types of membership functions studied by many researchers, including triangular membership function, trapezoidal membership function and bell-shaped membership function. In I research we used beta function. Based on this paper study classical method to obtain estimation fuzzy reliability function for both series and parallel systems.

من الأمور المهمة التي يقدمها الأنموذج الضبابي هو تحديد دوال الانتماء. التي تستعمل في تطبيقات دالة المعولية الضبابية مع دوال الفشل من النوع الذي يهتم بالمتغيرات العشوائية الموجبة اذ أن هناك انواع عديدة من دوال الانتماء درست من قبل العديد من الباحثين منها والاكثر شيوعاً دالة الانتماء المثلثية و دالة الانتماء لشبه المنحرف والدالة الكاوسية اما في هذا البحث تم اعتماد دالة بيتا كدالة انتماء تكون اكثر مرونة في التطبيقات الاحصائية واعتمد في هذا البحث دراسة أسلوب الطريقة التقليدية للحصول على تقدير دالة المعولية الضبابية لكل من النظامين المتسلسل والمتوازي .

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