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Publications (10 of 36) Show all publications
Braz, T. B., Cimini, C. J., Wennhage, P., Zenkert, D. & Nyman, T. (2017). Thick ply versus thin ply composite laminate stiffened panel buckling and post-buckling behavior. In: ICCM International Conferences on Composite Materials: . Paper presented at 21st International Conference on Composite Materials, ICCM 2017, 20 August 2017 through 25 August 2017. International Committee on Composite Materials
Open this publication in new window or tab >>Thick ply versus thin ply composite laminate stiffened panel buckling and post-buckling behavior
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2017 (English)In: ICCM International Conferences on Composite Materials, International Committee on Composite Materials , 2017Conference paper, Published paper (Refereed)
Abstract [en]

For their weight reduction, thin web panels are often used in airspace industry. In this study, a basic fuselage section is represented by a stiffened panel composed by skin, frame, stiffeners and attachments, as conceived by Arakaki and Faria [1]. In this panel design, the structure withholds large loads after the buckling of the web. This study presents a comparison between thick and thin ply composite laminates behavior under shear buckling loads. The two concepts were modeled using the commercial finite element software Abaqus®. Buckling and post-buckling nonlinear behavior for both thick ply and thin ply laminates was analyzed and results were compared. 

Place, publisher, year, edition, pages
International Committee on Composite Materials, 2017
Keywords
Finite element analysis, Post-buckling analysis, Stiffened panel, Thin ply
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-236839 (URN)2-s2.0-85053148550 (Scopus ID)
Conference
21st International Conference on Composite Materials, ICCM 2017, 20 August 2017 through 25 August 2017
Note

QC 20181221

Available from: 2018-12-21 Created: 2018-12-21 Last updated: 2018-12-21Bibliographically approved
O'Reilly, C. J., Göransson, P., Funazaki, A., Suzuki, T., Edlund, S., Gunnarsson, C., . . . Potting, J. (2016). Life-cycle energy optimisation: A proposed methodology for integrating environmental considerations early in the vehicle engineering design process. Journal of Cleaner Production, 135, 750-759
Open this publication in new window or tab >>Life-cycle energy optimisation: A proposed methodology for integrating environmental considerations early in the vehicle engineering design process
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2016 (English)In: Journal of Cleaner Production, ISSN 0959-6526, Vol. 135, p. 750-759Article in journal (Refereed) Published
Abstract [en]

To enable the consideration of life cycle environmental impacts in the early stages of vehicle design, a methodology using the proxy of life cycle energy is proposed in this paper. The trade-offs in energy between vehicle production, operational performance and end-of-life are formulated as a mathematical problem, and simultaneously balanced with other transport-related functionalities, and may be optimised. The methodology is illustrated through an example design study, which is deliberately kept simple in order to emphasise the conceptual idea. The obtained optimisation results demonstrate that there is a unique driving-scenario-specific design solution, which meets functional requirements with a minimum life cycle energy cost. The results also suggest that a use-phase focussed design may result in a solution, which is sub-optimal from a life cycle point-of-view.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Life-cycle energy, vehicle design, optimization, functional conflicts
National Category
Vehicle Engineering Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-175827 (URN)10.1016/j.jclepro.2016.06.163 (DOI)000382792900065 ()2-s2.0-84990218392 (Scopus ID)
Note

QC 20160623

Available from: 2015-10-22 Created: 2015-10-22 Last updated: 2019-02-08Bibliographically approved
Poulikidou, S., Schneider, C., Björklund, A., Kazemahvazi, S., Wennhage, P. & Zenkert, D. (2015). A material selection approach to evaluate material substitution for minimizing the life cycle environmental impact of vehicles. Materials & design, 83, 704-712
Open this publication in new window or tab >>A material selection approach to evaluate material substitution for minimizing the life cycle environmental impact of vehicles
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2015 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 83, p. 704-712Article in journal (Refereed) Published
Abstract [en]

Weight reduction is commonly adopted in vehicle design as a means for energy and emissions savings. However, selection of lightweight materials is often focused on performance characteristics, which may lead to sub optimizations of life cycle environmental impact. Therefore systematic material selection processes are needed that integrate weight optimization and environmental life cycle assessment. This paper presents such an approach and its application to design of an automotive component. Materials from the metal, hybrid and polymer families were assessed, along with a novel self-reinforced composite material that is a potential lightweight alternative to non-recyclable composites. It was shown that materials offering the highest weight saving potential offer limited life cycle environmental benefit due to energy demanding manufacturing. Selection of the preferable alternative is not a straightforward process since results may be sensitive to critical but uncertain aspects of the life cycle. Such aspects need to be evaluated to determine the actual benefits of lightweight design and to base material selection on more informed choices.

Keywords
Lightweight design, Material selection, Life cycle assessment, Sandwich structures, Self-reinforced composites
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-173255 (URN)10.1016/j.matdes.2015.06.079 (DOI)000359329000080 ()2-s2.0-84941312731 (Scopus ID)
Note

QC 20150911

Available from: 2015-09-11 Created: 2015-09-09 Last updated: 2017-09-08Bibliographically approved
Lundberg, E., Göransson, P., Orrenius, U. & Wennhage, P. (2015). Predicted and measured anisotropic acoustic and elastic properties for open cell porous material and their influence on typical train applications. In: : . Paper presented at EURONOISE 2015.
Open this publication in new window or tab >>Predicted and measured anisotropic acoustic and elastic properties for open cell porous material and their influence on typical train applications
2015 (English)Conference paper, Published paper (Refereed)
National Category
Fluid Mechanics and Acoustics
Identifiers
urn:nbn:se:kth:diva-165039 (URN)
Conference
EURONOISE 2015
Note

NQC 2015

Available from: 2015-04-21 Created: 2015-04-21 Last updated: 2016-05-23Bibliographically approved
Wallmark, O., Nybacka, M., Malmquist, D., Burman, M., Wennhage, P. & Géoren, P. (2014). Design and implementation of an experimental research and concept demonstration vehicle. In: 2014 IEEE Vehicle Power and Propulsion Conference, VPPC 2014: . Paper presented at 2014 IEEE Vehicle Power and Propulsion Conference, VPPC 2014, 27 October 2014 through 30 October 2014. IEEE conference proceedings
Open this publication in new window or tab >>Design and implementation of an experimental research and concept demonstration vehicle
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2014 (English)In: 2014 IEEE Vehicle Power and Propulsion Conference, VPPC 2014, IEEE conference proceedings, 2014Conference paper, Published paper (Refereed)
Abstract [en]

This paper introduces the Research Concept Vehicle (RCV), an experimental research and demonstration vehicle developed at KTH Royal Institute of Technology. The vehicle is intended as a platform to implement, validate, and demonstrate research results from different research projects carried out at KTH. In its first generation, the RCV is a pure electric vehicle where each wheel is equipped with an in-wheel motor and individual steering and camber actuators. This high level of over actuation allows for a wide range of experimental evaluation in several fields of research, which is listed in this paper. Results from initial experimental test drives are also included.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2014
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-174805 (URN)10.1109/VPPC.2014.7007042 (DOI)2-s2.0-84934325440 (Scopus ID)9781479967834 (ISBN)
Conference
2014 IEEE Vehicle Power and Propulsion Conference, VPPC 2014, 27 October 2014 through 30 October 2014
Funder
Integrated Transport Research Lab (ITRL)StandUpTrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20151209. QC 20160304

Available from: 2015-12-09 Created: 2015-10-07 Last updated: 2016-11-11Bibliographically approved
Wennberg, D., Stichel, S. & Wennhage, P. (2014). Finite difference adaptation of the decomposition of layered composite structures on irregular grid. Journal of composite materials, 48(20), 2427-2439
Open this publication in new window or tab >>Finite difference adaptation of the decomposition of layered composite structures on irregular grid
2014 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793X, Vol. 48, no 20, p. 2427-2439Article in journal (Refereed) Published
Abstract [en]

The finite difference method is used to solve the time-dependent thermo mechanical response of a layered composite structure subjected to fire. State variables of the composite are chosen whereby the external and internal boundary conditions are derived for an irregular grid through the thickness of the structure. The homogenised mass flux and specific heat capacity of pyrolysis gases over a layered composite is also defined. The formulations are tested against documented results found in the literature.

Keywords
composites, layered structure, fire response, pyrolysis, finite difference method
National Category
Vehicle Engineering Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-122383 (URN)10.1177/0021998313499196 (DOI)000340207400001 ()2-s2.0-84904814624 (Scopus ID)
Funder
Vinnova
Note

Updated from submitted to published.

QC 20140912

Available from: 2013-05-20 Created: 2013-05-20 Last updated: 2017-12-06Bibliographically approved
O'Reilly, C. J., Göransson, P., Potting, J., Cameron, C. J. & Wennhage, P. (2014). Life-cycle energy optimisation for sustainable vehicle design. In: FISITA World Automotive Congress: . Paper presented at FISITA 2014 World Automotive Congress takes 2-6 June 2014 Maastricht, the Netherlands.
Open this publication in new window or tab >>Life-cycle energy optimisation for sustainable vehicle design
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2014 (English)In: FISITA World Automotive Congress, 2014Conference paper, Published paper (Other academic)
Abstract [en]

A methodology is presented in this paper, in which the trade-offs in energy between vehicle production, operational performance and end-of-life are formulated as a mathematical problem that may be optimised. This methodology enables the consideration of the life-cycle environmental impact, through the proxy of life-cycle energy, in the very first stages of transport vehicle design where it can be concurrently balanced with other functionalities. The methodology is illustrated through a sandwich panel design case study. The optimisation results for this case demonstrate that a design solution does exist, which meets functional requirements with a minimum life-cycle energy cost. They also highlight that a pure lightweight design may result in a solution, which is sub-optimal from a life cycle point-of-view. 

National Category
Vehicle Engineering Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-159509 (URN)2-s2.0-85060459829 (Scopus ID)
Conference
FISITA 2014 World Automotive Congress takes 2-6 June 2014 Maastricht, the Netherlands
Note

QC 20151210

Available from: 2015-02-02 Created: 2015-02-02 Last updated: 2019-05-09Bibliographically approved
Velea, M. N., Wennhage, P. & Zenkert, D. (2014). Multi-objective optimisation of vehicle bodies made of FRP sandwich structures. Composite structures, 111, 75-84
Open this publication in new window or tab >>Multi-objective optimisation of vehicle bodies made of FRP sandwich structures
2014 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 111, p. 75-84Article in journal (Refereed) Published
Abstract [en]

An optimisation methodology is developed and applied on a FRP sandwich body of an electric vehicle - ZBee, where single-objective and multi-objective optimisation studies are performed stepwise using a commercially available software package. The single-objective optimisation allows the identification of the load paths within the composite body, according to the loading conditions previously defined. Within the multi-objective optimisation, the optimum thickness and distribution for each of the layers that form the composite body are searched within the design space so as to obtain the best performance with respect to weight, material cost, global and local stiffness. Strength requirements are also considered as constraints within the optimisation. A conflict situation appears when several objectives are considered within the optimisation, meaning that an increased performance in one objective may often lead to a decreased performance for the others. Therefore, a trade-off between objectives is needed. The interpretation of results is partially made by using trade-off plots, the so-called Pareto frontiers. A method for the overall selection of the most beneficial solutions is proposed and applied in order to choose between the best obtained solutions according to the importance of the objectives.

Place, publisher, year, edition, pages
Elsevier, 2014
Keywords
Composite structures, FRP sandwich, Multi-objective optimisation
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-145809 (URN)10.1016/j.compstruct.2013.12.030 (DOI)000335486900008 ()2-s2.0-84896348789 (Scopus ID)
Funder
Mistra - The Swedish Foundation for Strategic Environmental Research
Note

QC 20140602

Available from: 2014-06-02 Created: 2014-06-02 Last updated: 2017-12-05Bibliographically approved
Cameron, C. J., Nordgren, E. L., Wennhage, P. & Göransson, P. (2014). On the balancing of structural and acoustic performance of a sandwich panel based on topology, property, and size optimization. Journal of Sound and Vibration, 333(13), 2677-2698
Open this publication in new window or tab >>On the balancing of structural and acoustic performance of a sandwich panel based on topology, property, and size optimization
2014 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 333, no 13, p. 2677-2698Article in journal (Refereed) Published
Abstract [en]

Balancing structural and acoustic performance of a multi-layered sandwich panel is a formidable undertaking. Frequently the gains achieved in terms of reduced weight, still meeting the structural design requirements, are lost by the changes necessary to regain acceptable acoustic performance. To alleviate this, a design method for a multifunctional load bearing vehicle body panel is proposed which attempts to achieve a balance between structural and acoustic performance. The approach is based on numerical modelling of the structural and acoustic behaviour in a combined topology, size, and property optimization in order to achieve a three dimensional optimal distribution of structural and acoustic foam materials within the bounding surfaces of a sandwich panel. In particular the effects of the coupling between one of the bounding surface face sheets and acoustic foam are examined for its impact on both the structural and acoustic overall performance of the panel. The results suggest a potential in introducing an air gap between the acoustic foam parts and one of the face sheets, provided that the structural design constraints are met without prejudicing the layout of the different foam types.

Keywords
Porous-Media, Frequency Range, Elastic Waves, Propagation, Constraints, Eso
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-145797 (URN)10.1016/j.jsv.2014.01.025 (DOI)000335274100002 ()2-s2.0-84904113598 (Scopus ID)
Note

QC 20140603

Available from: 2014-06-03 Created: 2014-06-02 Last updated: 2017-12-05Bibliographically approved
Wennberg, D., Stichel, S. & Wennhage, P. (2014). Substitution of corrugated sheets in a railway vehicle's body structure by a multiple-requirement based selection process. Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, 228(2), 143-157
Open this publication in new window or tab >>Substitution of corrugated sheets in a railway vehicle's body structure by a multiple-requirement based selection process
2014 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 228, no 2, p. 143-157Article in journal (Refereed) Published
Abstract [en]

To simplify construction, reduce weight and improve mechanical properties, a sandwich panel substitution process is performed on corrugated sheets in the floor and roof of a rail vehicle car body. A requirement based selection is used to design the sandwich panels with the corrugated sheet mechanical characteristics as boundaries. Car body stiffness is evaluated by modal analysis. The derived panels reduce the mass of the car body by 600-700kg. Results show the varying importance of the longitudinal, transverse and shear properties of the floor and roof panels, as well as how efficient the corrugated sheets actually are.

Keywords
sandwich panels, lightweight, corrugated sheet, rail vehicle, modal analysis
National Category
Vehicle Engineering Reliability and Maintenance Other Materials Engineering
Research subject
Järnvägsgruppen - Fordonsteknik
Identifiers
urn:nbn:se:kth:diva-33757 (URN)10.1177/0954409712467139 (DOI)000330771400003 ()2-s2.0-84892577539 (Scopus ID)
Funder
Vinnova
Note

QC 20140310

Available from: 2011-05-16 Created: 2011-05-16 Last updated: 2017-12-11Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0198-6660

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