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Article
Fault Tree Analysis as a Modern Technique for Investigating Causes of Some Construction Project Problems

Author: Abbas M. Burhan
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2010 Volume: 16 Issue: 2 Pages: 5214 -5224
Publisher: Baghdad University جامعة بغداد

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Abstract

Construction projects contain many problems that can occur during the execution. Each problem results from many causes. Fault tree analysis (FTA) technique is a graphical model for analyzing causes of a problem (or undesired event) using logic gates to describe combinations of individual faults that can create an undesired event. Each level of the tree lists the lower level events that are necessary to cause the event shown in the level above it. The assessment process of a problem with FTA technique can be divided into two types: qualitative and quantitative assessment. As a case study to apply FTA technique in construction field, the researcher studied a building in Baghdad that had punching shear problem to analyze the causes lead to this problem. This research aims to introduce the main principles of FTA technique and how to use in identifying and analyzing the causes of problems that can occur in the construction projects. Also, it aims to compute the probability of occurrence of any problem or undesired event.

ان المشاريع الأنشائية تحتوي على الكثير من المشاكل أثناء التنفيذ وكل مشكلة تنتج من عدة أسباب. تقنية تحليل شجرة العيب (FTA) هي نموذج تصويري لتحليل أسباب مشكلة معينة (أو حدث غير مرغوب) بأستخدام رموز منطقية (Logic Gates) لوصف مجموعة من العيوب أو الأسباب التي تولد الحدث الغير مرغوب فيه. كل مستوى من شجرة العيب يضم الأحداث الأقل مستوى التي حدوثها يكون ضروري لتسبب الحدث الذي في أعلى المستوى من الشجرة. أن عملية تقييم أي مشكلة ضمن تقنية تحليل شجرة العيب يمكن تقسيمها الى نوعين: تقييم نوعي وتقييم كمي. كدراسة حالة لتطبيق تقنية (FTA) في حقل الأنشاء، أخذ الباحث بناية في بغداد تعاني مشكلة قص الأنثقاب لتحليل الأسباب التي أدت الى هذه المشكلة. يهدف هذا البحث الى تقديم المباديء الأساسية لتقنية FTA وكيفية أستخدامها في تحليل أسباب المشاكل التي قد تحصل في المشاريع الأنشائية وكيفية أحتساب أحتمالية حدوث أي مشكلة.


Article
Developing of Reliability-Centered Maintenance Methodology in Second Power Plant of South Baghdad

Authors: Amjad B. Adulghafour --- Ammar I. Abdulwahed
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 8 Part (A) Engineering Pages: 842-852
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Electric equipments of power station must be operated in the state of high reliability with its responsibility in the seamless power supply. Maintenance is one of the important and most costly phases in the lifecycle of any power generation systems, to improve maintenance management and system reliability and maintain the continuity of work of the system. Reliability-Centered Maintenance (RCM) is one of the most recent maintenance techniques. In this research, an enhanced RCM methodology based on quantitative relationships implemented at system component level and the overall system reliability was applied to identify the distribution components that are critical to system reliability. Only unit one of the Second Power Plant of South Baghdad were selected as a case study in this research application. The major contribution of the study is to create a maintenance plan through applying statistical, historical data to generate a failure probability distribution model by using the combined methods of Failure Mode of Effects and Criticality Analysis (FMECA) and Fault Tree Analysis (FTA). Evaluation criteria and matrixes of criticality are used to evaluate the criticality level of failure modes. The overall approach developed offers a cost-effective model, which can be applied prior to testing and inspection procedures during the RCM application. The results obtained from this case study show that the application of proposed RCM methodology based on preventive maintenance planning will decrease the total cost value of maintenance about 463469.85 $. That Indicates saving about 59% of the total downtime cost compared with current maintenance. As well as Proposed maintenance program reduce the required time to repair the plant components annually at a rate 6 day so that represent that the labor cost will minimized about 6424 $.

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