Dynamically-controlled variable-fidelity modelling for aircraft structural design optimisation

Allen, J.G.; Coates, G.; Trevelyan, J.

Abstract

Structural mass optimisation of an aircraft design is important in increasing the likelihood that a high quality airframe is designed of minimal weight whilst providing necessary resistance to load. Analysis of such structures is often performed at a single level of model fidelity, the selection of which can lead to either excessive computational time or reduced accuracy of results. Alternatively, variable-fidelity modelling may be employed to reduce such computational expense whilst maintaining accuracy, traditionally performed using predetermined levels of fidelity for specific periods of the optimisation process. This paper investigates dynamically controlled variable-fidelity modelling during aircraft conceptual design optimisation wherein fidelity is controlled as a dynamic parameter of the optimisation process. Consequently, model fidelity is adapted during optimisation to promote early discovery of promising design characteristics prior to detailed analysis of the best designs available. Models are constructed through the grouping of similar structural members within elements, thus reducing the number of degrees of freedom and subsequent computational effort required for analysis of each design. A case study is performed to verify the results of analysis and obtain benchmark results for optimisation with static model fidelity prior to the investigation of various set-ups of dynamically controlled variablefidelity modelling. The results of this study indicate improved design quality using dynamically controlled variable-fidelity modelling compared to using static model fidelity whilst reducing the necessary computation time.

Citation

Allen, J., Coates, G., & Trevelyan, J. (2014). Dynamically-controlled variable-fidelity modelling for aircraft structural design optimisation. Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 228(8), 1434-1449. https://doi.org/10.1177/0954410013493074

• Journal Article Type: Article
• Publication Date: Jun 1, 2014
• Deposit Date: Jan 17, 2014
• Publicly Available Date: Mar 25, 2015
• Journal: Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering
• Print ISSN: 0954-4100
• Electronic ISSN: 2041-3025
• Publisher: SAGE Publications
• Peer Reviewed: Peer Reviewed
• Volume: 228
• Issue: 8
• Pages: 1434-1449
• DOI: https://doi.org/10.1177/0954410013493074
• Keywords: Aircraft conceptual design, Structural optimisation, Variable-fidelity modelling, Parameter control.
• Public URL: https://durham-repository.worktribe.com/output/1464982