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An Industrial Implementation of an Optimization Based Method for Balancing Safety, Reliability and Weight of Aircraft Systems
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, Faculty of Science & Engineering.
SAAB Aeronautics, Linköping, Sweden.
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2017 (English)In: Risk, Reliability and Safety: Innovating Theory and Practice: Proceedings of ESREL 2016 (Glasgow, Scotland, 25-29 September 2016) / [ed] Lesley Walls, Matthew Revie and Tim Bedford, CRC Press, 2017, 1707-1713 p.Conference paper, Published paper (Refereed)
Abstract [en]

The aim of this paper is to show how a method able of trade-offs such as system safety, reliability, weight and cost can be practically implemented in industry (SAAB Aeronautics). The scope is to facilitate the decision-making on the optimal design in early design phases. The method consists of several steps guiding the user to model each objective, verify and validate the models, perform optimization and finally visualize and select the results. Within the practical implementation of this method, several challenges are addressed and solved. For example, one challenge is to implement the trade-off method using the existing programs. Another challenge is the user friendliness of the implementation. In order to solve these challenges, the analysis is started and performed in Matlab. A Graphical User Interface guides the user to select the analysis to perform, budgets/requirements for each objective and parameters with influence on end-result. Data regarding the safety and reliability objectives, exported from Reliability Workbench program to Excel, is imported to Matlab, where the analysis is performed. The results are extracted into an Excel file, where the user can work further on visualization and selection. Two small examples are used to demonstrate this practical implementation of the trade-off method. Lessons learned are presented, strengths, limitations and development potential.

Place, publisher, year, edition, pages
CRC Press, 2017. 1707-1713 p.
National Category
Computer Systems Embedded Systems Software Engineering
Identifiers
URN: urn:nbn:se:liu:diva-134590ISI: 000414164700242ISBN: 9781138029972 (print)ISBN: 9781315374987 (electronic)OAI: oai:DiVA.org:liu-134590DiVA: diva2:1075461
Conference
ESREL 2016, Glasgow, Scotland, 25-29 September 2016
Note

Funding agencies:The implementation presented in this paper is part of a research funded by Saab Aeronautics and the National Aviation Engineering Research Program (NFFP), jointly driven by the Swedish Armed Forces, the Swedish Defense Materiel Administration (FMV), and the Swedish Governmental Agency for Innovation Systems (VINNOVA).

Available from: 2017-02-20 Created: 2017-02-20 Last updated: 2017-11-20Bibliographically approved
In thesis
1. 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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Citation style
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