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Choosing the reliability approach: A guideline for selecting the appropriate reliability method in the design process
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology. Saab Aeronautics, Linköping, Sweden.
Saab Aeronautics, Linköping, Sweden.
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
2013 (English)In: Proceedings of the 20th Advances in Risk and Reliability Technology Symposium 21–23 May 2013 / [ed] Lisa Jackson and John Andrews, Loughborough: Loughborough University, UK , 2013, 366-378 p.Conference paper, Published paper (Other academic)
Abstract [en]

The main objective of a reliability study should always be to provide information as a basis for decisions, e.g. concept choice, design requirements, investment, choice of suppliers, design changes or guaranty claims. The choice of reliability method depends on the time allocated for the reliability study, the design stage, the problem at hand and the competence and resources available.

During a reliability study the engineer focuses on providing a graphical means of evaluating the relationships between different parts of the system, gathering or assessing the reliability data for the components and interpreting the results of the analyses. Even though the commercial software tools available claim to provide answers to most reliability questions, choosing which method is best suited is not an easy task. Often several methods can be applied and none of them will fit the purpose perfectly.

This paper presents a guideline for choosing the best suited reliability method in early design phases from two aspects: objective and system characteristics. The methods studied are the most common methods available in commercial software tools: Reliability Block Diagram (RBD), Fault Tree (FT), Event Tree (ET), Markov Analysis (MA) and Stochastic Petri Network (SPN). The guideline considers two aspects: the characteristics of the system studied and the scope of the analysis. The applicability of each of the five chosen methods is assessed for all possible combinations of system characteristics and objective. A study has been made at Saab Aeronautics to evaluate the practical use of the analysed methods and how this guideline can improve the selection of appropriate reliability methods in early design phases.

Place, publisher, year, edition, pages
Loughborough: Loughborough University, UK , 2013. 366-378 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-94352ISBN: 9781907382611 (print)OAI: oai:DiVA.org:liu-94352DiVA: diva2:632440
Conference
The 20th Advances in Risk and Reliability Technology Symposium, 21st – 23rd May 2013, Burleigh Court Conference Centre, Loughborough, Leicestershire, UK
Available from: 2013-06-25 Created: 2013-06-25 Last updated: 2017-02-20Bibliographically approved
In thesis
1. On System Safety and Reliability in Early Design Phases: Cost Fo cused Optimization Applied on Aircraft Systems
Open this publication in new window or tab >>On System Safety and Reliability in Early Design Phases: Cost Fo cused Optimization Applied on Aircraft Systems
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

System Safety and Reliability are fundamental to system design and involve a quantitative assessment prior to system development. An accurate prediction of reliability and system safety in a new product before it is manufactured and marketed is necessary as it allows us to forecast accurately the support costs, warranty costs, spare parts requirements, etc. On the other hand, it can be argued that an accurate prediction implies knowledge about failures that is rarely there in early design phases. Furthermore, while predictions of system performance can be made with credible precision, within reasonable tolerances, reliability and system safety are seldom predicted with high accuracy and confidence.

How well a product meets its performance requirements depends on various characteristics such as quality, reliability, availability, safety, and efficiency. But to produce a reliable product we may have to incur increased cost of design and manufacturing. Balancing such requirements, that are often contradictory, is also a necessary step in product development. This step can be performed using different optimization techniques.

This thesis is an attempt to develop a methodology for analysis and optimization of system safety and reliability in early design phases. A theoretical framework and context are presented in the first part of the thesis, including system safety and reliability methods and optimization techniques. Each of these topics is presented in its own chapter. The second and third parts are dedicated to contributions and papers. Three papers are included in the third part; the first evaluates the applicability of reliability methods in early design phases, the second is a proposed guideline for how to choose the right reliability method, and the third suggests a method to balance the safety requirements, reliability goals, and costs.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2013. 62 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1600
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-94354 (URN)LIU-TEK-LIC-2013:34 (Local ID)978-91-7519-584-1 (ISBN)LIU-TEK-LIC-2013:34 (Archive number)LIU-TEK-LIC-2013:34 (OAI)
Supervisors
Funder
Vinnova
Available from: 2013-06-25 Created: 2013-06-25 Last updated: 2013-06-25Bibliographically approved
2. Multiobjective Optimization for Safety and Reliability Trade-off: Applications on Early Phases of Aircraft Systems Design
Open this publication in new window or tab >>Multiobjective Optimization for Safety and Reliability Trade-off: Applications on Early Phases of Aircraft Systems Design
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A strategic issue for any industrial company is to conceive safe and reliable systems while performing all systems’ intended functions at a minimum cost. System safety and reliability are fundamental to system design and involve a quantitative assessment prior to system development. Aircraft design is a multifaceted process that involves several different disciplines, system safety and reliability among them, to obtain o holistic approach of a complex product. During the last decades, the idea of trade-off between safety or reliability goals against other characteristics has become more prominent. Furthermore, while predictions of system performance can be made in early design phases with credible precision, within reasonable tolerances, reliability and system safety are seldom predicted with high accuracy and confidence. Making the right design decisions in the early design phase is vital to the success of a project. Nowadays, it is essential within the design of new products, to increase awareness (knowledge) early in the design phases and keep the design decisions (freedom) open as long as possible, and with that also keep down the allocated costs.

This thesis presents MOSART (Multiobjective Optimization for Safety and Reliability Trade-off), a method promoting a systematic approach regarding trade-offs between system safety and reliability goals against other contradictory targets, such as weight and cost, in early design phases.

A theoretical framework and context are presented in the first part of the thesis, including system safety and reliability methods and optimization techniques. The second and third parts are dedicated to contributions and papers, where seven papers are included. These papers approach different aspects of MOSART, from the basic idea to the implementation and usage of the method in the conceptual phase of aircraft systems design. Several aspects regarding the choice of system safety and reliability methods in early design phases are also included in the papers, e.g. evaluation of applicability of reliability methods in early design phases, considerations around the usage of these methods within the MOSART framework and a proposal of a guideline for how to choose the right reliability method. All the examples used in the papers are chosen from basic aircraft sub-systems.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2017. 89 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1833
National Category
Production Engineering, Human Work Science and Ergonomics Embedded Systems Other Engineering and Technologies not elsewhere specified Computer Systems Design
Identifiers
urn:nbn:se:liu:diva-134592 (URN)9789176855768 (ISBN)
Public defence
2017-03-23, C3, C-huset, Campus Valla, Linköping, 10:15 (English)
Opponent
Supervisors
Funder
VINNOVA
Note

The research project has been financed by the researchprogrammes NFFP5 2009-01316 and NFFP6 2013-01223 funded by Saab Aeronautics and theNational Aviation Engineering Research Program (NFFP), jointly driven by the Swedish ArmedForces, the Swedish Defence Materiel Administration (FMV),

Available from: 2017-02-20 Created: 2017-02-20 Last updated: 2017-02-20Bibliographically approved

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Choosing the reliability approach: A guideline for selecting the appropriate reliability method in the design process(515 kB)35 downloads
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Johansson, CristinaDerelöv, MichaelÖlvander, Johan

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