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Component mode synthesis using undeformed interface coupling modes to connect soft and stiff substructures
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0003-1855-5437
2013 (English)In: Shock and Vibration, ISSN 1070-9622, E-ISSN 1875-9203, Vol. 20, no 1, p. 157-170Article in journal (Refereed) Published
Abstract [en]

Classical component mode synthesis methods for reduction are usually limited by the size and compatibility of the coupling interfaces. A component mode synthesis approach with constrained coupling interfaces is presented for vibro-acoustic modelling. The coupling interfaces are constrained to six displacement degrees of freedom. These degrees of freedom represent rigid interface translations and rotations respectively, retaining an undeformed interface shape. This formulation is proposed for structures with coupling between softer and stiffer substructures in which the displacement is chiefly governed by the stiffer substructure. Such may be the case for the rubber-bushing/linking arm assembly in a vehicle suspension system. The presented approach has the potential to significantly reduce the modelling size of such structures, compared with classical component mode synthesis which would be limited by the modelling size of the interfaces. The approach also eliminates problems of nonconforming meshes in the interfaces since only translation directions, rotation axes and the rotation point need to be common for the coupled substructures. Simulation results show that the approach can be used for modelling of systems that resemble a vehicle suspension. It is shown for a test case that adequate engineering accuracy can be achieved when the stiffness properties of the connecting parts are within the expected range of rubber connected to steel.

Place, publisher, year, edition, pages
2013. Vol. 20, no 1, p. 157-170
Keywords [en]
Vibro-acoustic, component mode synthesis, substructuring, vehicle suspension, rubber bushings
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-119489DOI: 10.3233/SAV-2012-0734ISI: 000314893500012Scopus ID: 2-s2.0-84873614888OAI: oai:DiVA.org:kth-119489DiVA, id: diva2:611087
Note

QC 20130314

Available from: 2013-03-14 Created: 2013-03-14 Last updated: 2022-06-24Bibliographically approved
In thesis
1. A Vibro-Acoustic Study of Vehicle Suspension Systems: Experimental and Mathematical Component Approaches
Open this publication in new window or tab >>A Vibro-Acoustic Study of Vehicle Suspension Systems: Experimental and Mathematical Component Approaches
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The objective of the present work is to study the vehicle suspension as a vibro-acoustic system of high complexity, consisting of many sub-systems with fundamentally different acoustical properties. In a parallel numerical and experimental modelling effort, important contributions to the understanding of its behaviour have been achieved. These findings are based on a balance between component investigations and global modelling of the complete system; they have been formulated for the transmission of both tyre-road excitation and friction-induced vibrations in the brake system.

Initially an experimental study was conducted on a full vehicle test rig studying the broadband interior brake noise problem of, here named, roughness noise. The purpose of the study was twofold: first, to determine if the transmission from the source to the interior of the vehicle was structure-borne; second, to study the complexity of the suspension as a vibro-acoustic system. Parameters a_ecting the vibro-acoustic source were varied to gain understanding of the source mechanisms. This experimental study laid the foundation of the first part of this thesis (paper A) and provided the directions for the second part, the development of a mathematical modelling approach (paper B and C). In these two papers, methods for analysing the complex vibro-acoustic transfer of structure-borne sound in a vehicle suspension system were developed. The last part was then focussed on the wheel rim influence on the vibro-acoustic behaviour (paper D) of the suspension system. As a whole, the work clearly demonstrates that it is possible to conduct component studies of subsystems in the vehicle suspension system; and from these component studies it is possible draw conclusions that very well may avoid severe degradations in the interior noise of future vehicle generations.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. p. x, 61
Series
Trita-AVE, ISSN 1651-7660 ; 2013:17
Keywords
Acoustics, Vehicle suspension, Disc brake, Wheel rim Roughness noise, Interior tyre-road noise Component mode synthesis, Undeformed coupling interface
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-121575 (URN)978-91-7501-732-7 (ISBN)
Public defence
2013-05-22, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

QC 20130503

Available from: 2013-05-03 Created: 2013-05-02 Last updated: 2022-06-24Bibliographically approved

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Göransson, Peter

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