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An examination of the effect of geometric-related design parameters and aerodynamic drag estimations on energy efficient early-stage vehicle design within the context of the life cycle energy optimisation methodology
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0002-1848-7924
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-0176-5358
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.ORCID iD: 0000-0003-1855-5437
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The Life Cycle Energy Optimisation (LCEO) methodology aims at finding a design solution that uses a minimum amount of cumulative energy from the production, use and end-of-life phases, while meeting a set of functional constraints. This effectively balances trade-offs between the energy-use inherent in the flow of materials used in the vehicle structure and the energy used in the operation of the vehicle. It therefore avoids sub-optimal shifting of environmental burdens amongst the different phases of the vehicle’s life cycle. Previous efforts with this methodology dealt, initially, with the minimisation of the production and use energy of a car roof panel with the layer thicknesses and material compositions of the sandwich panel as design variables. Subsequently, the concept was extended by the addition of the energies associated with different end-of-life treatment strategies to the life cycle energy of a fixed geometry with variable material compositions. This present work expands on these previous studies by including the effects of curvature, and its impact on aerodynamic drag, on the resulting design. Aerodynamic considerations are taken into account through the drag coefficient of the car body shape and its impact on the operational phase energy. The design is both mechanically and geometrically constrained, with the design variables consisting in the material compositions of the different layers, their thicknesses as well as the shape parameters. This study showcases the LCEO methodology’s ability to deal with conflicting functional requirements while still leading to a globally optimal design from a life cycle vantage point. It also provides insights into the impact of these conflicts on the presence of local minima and their nature. 

Keywords [en]
Aerodynamic drag, functional conflicts, life cycle en- ergy, optimisation, vehicle design.
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223377OAI: oai:DiVA.org:kth-223377DiVA, id: diva2:1183815
Note

QCR 20180312

Available from: 2018-02-19 Created: 2018-02-19 Last updated: 2018-03-12Bibliographically approved

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Bouchouireb, HamzaO'Reilly, Ciarán J.Göransson, Peter
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