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Using Optimization as a Tool in Fuel System Conceptual Design
Linköping University, Department of Management and Engineering, Machine Design. Linköping University, The Institute of Technology.
Linköping University, Department of Mechanical Engineering. Linköping University, The Institute of Technology.
2003 (English)In: SAE World Aviation Congress and Display, Montreal, Canada, SAE Technical Paper 2003-01-3054, 2003, no 2003-01-3052Conference paper, Published paper (Refereed)
Abstract [en]

Choosing between concepts is often the most critical part of the design process. Different concepts have different advantages and disadvantages. The concept that is the best choice is most often dependent on the top level requirements. Sometimes there may also be a trade off between concept choice and the top requirements. In aircraft (a/c) fuel system design it has often proved difficult to find the switching point where the superior concept is changed. This sometimes makes the designer conservative and leads to the selection of a concept with too high a penalty. There is also a risk for the opposite and perhaps worse scenario: That the designer strives to reduce weight and cost and therefore, accidentally, chooses an under achieving concept and thus induces large downstream cost if late redesign or retro modifications are necessary.

This paper shows how optimization has been successfully used at Saab Aerospace as a tool that supports concept selection. The example shown is the choice of fuel transfer method for a ventral drop tank. The example also illustrates the impact of top-level requirements on low-level practicalities such as fuel system design.

Place, publisher, year, edition, pages
2003. no 2003-01-3052
Series
SAE Technical Paper
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-12988DOI: 10.4271/2003-01-3054OAI: oai:DiVA.org:liu-12988DiVA: diva2:17592
Conference
SAE World Aviation Congress and Display, WAC 03, September 8-12, Montreal, Canada
Available from: 2008-04-01 Created: 2008-04-01 Last updated: 2014-01-21Bibliographically approved
In thesis
1. On aircraft fuel systems: conceptual design and modeling
Open this publication in new window or tab >>On aircraft fuel systems: conceptual design and modeling
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The largest and most important fluid system in an aircraft is the fuel system. Obviously, future aircraft projects involve the design of fuel system to some degree. In this project design methodologies for aircraft fuel systems are studied, with the aim to shortening the system development time.

This is done by means of illustrative examples of how optimization and the use of matrix methods, such as the morphological matrix, house of quality and the design structure matrix, have been developed and implemented at Saab Aerospace in the conceptual design of aircraft fuel systems. The methods introduce automation early in the development process and increase understanding of how top requirements regarding the aircraft level impact low-level engineering parameters such as pipe diameter, pump size, etc. The morphological matrix and the house of quality matrix are quantified, which opens up for use of design optimization and probabilistic design.

The thesis also discusses a systematic approach when building a large simulation model of a fluid system where the objective is to minimize the development time by applying a strategy that enables parallel development and collaborative engineering, and also by building the model to the correct level of detail. By correct level of detail is meant the level that yields a simulation outcome that meets the stakeholders’ expectations. The experienced gained at Saab in building a simulation model, mainly from the Gripen fuel system, but also the accumulated experience from other system models, is condensed and fitted into an overall process.

Place, publisher, year, edition, pages
Institutionen för ekonomisk och industriell utveckling, 2007
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1067
Keyword
Aircraft, morphological matrix, simulation, Saab, Gripen
National Category
Reliability and Maintenance
Identifiers
urn:nbn:se:liu:diva-11146 (URN)978-91-85643-04-2 (ISBN)
Public defence
2007-02-23, C3, Hus C, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2008-04-01 Created: 2008-04-01 Last updated: 2009-04-08
2. On Aircraft Fuel System Conceptual Design - Conceptual Evaluation and System modeling
Open this publication in new window or tab >>On Aircraft Fuel System Conceptual Design - Conceptual Evaluation and System modeling
2004 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

THE LARGEST AND most important fluid system in an aircraft is the fuel system. Obviously, future aircraft projects involve the design of fuel system to some degree. In this project design methodologies for aircraft fuel systems are studied, with the aim to shortening the system development time.

This is done by means of illustrative examples of how optimization and the use of matrix methods have been developed and implemented at Saab Aerospace in the conceptual design of ale fuel systems. The methods introduces automation early in the development process and increase understanding of how top requirements on the ale level impact low-level engineering parameters such as pipe diameter, pump size, etc.

The thesis also discusses a systematic approach when building a large simulation model of a fluid system where the objective is to minirnize the development time by applying a strategy that enables parallel development and collaborative engineering, and also by building the mode! to the correct level of detail. By correct level of detail is meant the level that yields a simulation outcome that meets the stakeholders' expectations. The experienced gained at Saab in building a simulation model, mainly from the Gripen fuel system, but also the accumulated experience from other system models, is condensed and fitted into an overall process.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2004. 52 + 4 articles p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1081
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-36010 (URN)LiU-Tek-Lic-2004:10 (Local ID)91-7373-923-5 (ISBN)LiU-Tek-Lic-2004:10 (Archive number)LiU-Tek-Lic-2004:10 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2014-01-21Bibliographically approved

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