Browsing by Author "Liaw, Cheng-Shih"

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Innovative reliability allocation using the maximal entropy ordered weighted averaging method
(2009-11-01)
Chang, Yung-Chia
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Chang, Kuie-Hu
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Liaw, Cheng-Shih
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工業工程與管理學系
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Department of Industrial Engineering and Management
Reliability allocation is one of the most important factors to consider when determining the reliability and competitiveness of a product. The feasibility-of-objectives (FOO) technique has become the current standard for assessing reliability designs for military mechanical-electrical systems, whereas the average weighting allocation method is widely used for commercial applications. However, assessment results are biased because these methods share two fundamental problems. The first problem is the measurement scale, while the second problem is that the system allocation factors are not equally weighted to one another. Both problems represent serious flaws from a technical perspective. To address these issues, we propose the use of the maximal entropy ordered weighted averaging (ME-OWA) method, which efficiently resolves the shortcomings of the FOO technique and the average weighting allocation method. As a comparative case study between the ME-OWA method and the two standards used in the military and commercially, this study evaluates reliability allocation in the context of a fighter aircraft airborne radar system. The results from this comparison show that the proposed method is both accurate and flexible. (C) 2009 Elsevier Ltd. All rights reserved.
ME-OWA based DEMATEL reliability apportionment method
(2011-08-01)
Liaw, Cheng-Shih
;
Chang, Yung-Chia
;
Chang, Kuei-Hu
;
Chang, Thing-Yuan
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工業工程與管理學系
The maximal entropy ordered weighted averaging (ME-OWA)-based decision making trial and evaluation laboratory (DEMATEL) method for reliability allocation has been examined. The assessment results show that most conventional reliability allocation methods have five fundamental problems. The first problem is the measurement scale: while the second problem is that the system allocation factors are not equally weighted to one another, the third problem is that most reliability allocations methods often neglect many important features, such as maintainability and risk issues. The fourth problem is that they do not consider indirect relations between subsystems or components, and the fifth problem is that they do not consider predicted failure rate in the apportionment process. This study evaluated reliability allocation using a fighter aircraft's digital flight control computer (DFLCC). The proposed method offers several benefits compared with current military and commercial approaches. The computational results clearly demonstrate the advantages of the proposed approach for solving the five fundamental problems. (C) 2011 Elsevier Ltd. All rights reserved.