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Nonlinear dynamic behaviour of coupled suspension systems
KTH, Superseded Departments, Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-1426-1936
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Vehicle Dynamics.ORCID iD: 0000-0002-4048-3452
2003 (English)In: Meccanica (Milano. Print), ISSN 0025-6455, E-ISSN 1572-9648, Vol. 38, no 1, 43-59 p.Article in journal (Refereed) Published
Abstract [en]

A two degrees of freedom model of two coupled suspension systems characterised by piecewise linear stiffness has been studied. The system, representing a pantograph current collector head, is shown to be sensitive to changes in excitation and system parameters, possessing chaotic, periodic and quasiperiodic behaviour. The coupled system has a more irregular behaviour with larger motions than the uncoupled suspension system, indicating that the response from the uncoupled suspension system cannot be used as a worst case measure. Since small changes in system parameters and excitation affect the results drastically then wear and mounting as well as actual operating conditions are crucial factors for the system behaviour.

Place, publisher, year, edition, pages
Springer, 2003. Vol. 38, no 1, 43-59 p.
Keyword [en]
pantograph current collector head, coupled suspensions, impact, nonlinear dynamic behaviour, OSCILLATOR, MOTION
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-13496DOI: 10.1023/A:1022067317220ISI: 000180561900005Scopus ID: 2-s2.0-0037273769OAI: oai:DiVA.org:kth-13496DiVA: diva2:325852
Note

QC 20100621

Available from: 2010-06-21 Created: 2010-06-21 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Effects of nonlinear dynamics in engineering systems
Open this publication in new window or tab >>Effects of nonlinear dynamics in engineering systems
2001 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2001. 19 p.
Series
Trita-FKT, 2001:03
Keyword
Nonlinear dynamics, Impacts, Subsystems, Chaos, Irregular, Behaviour, Printer Dynamics, Suspensions, Coupled systems
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-1208 (URN)
Note
QC 20100621Available from: 2001-04-02 Created: 2001-04-02 Last updated: 2010-06-21Bibliographically approved
2. Design and Control of Products Including Parts with Impacts
Open this publication in new window or tab >>Design and Control of Products Including Parts with Impacts
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Today's product development process should be rapid andcost-efficient, and should result in innovative and reliableproducts. A crucial factor is the dynamic behaviour of theproduct.

This thesis focuses on theoretical, numerical andexperimental approaches to achieve a comprehensiveunderstanding of dynamical phenomena occurring in nonlinearproducts, especially in products with parts that includeimpacts. The aim is to show the usefulness of nonlineartheories to better understand and optimise the dynamicbehaviour of products and thereby account for nonlinearphenomena already in the product development process.

This is achieved through an investigation of researchefforts in the field of nonlinear dynamics; identification ofimportant research directions; a study on the effect ofcouplings between nonlinear parts; a detailed study on thedynamic behaviour of a product component; investigations oflow-cost strategies for controlling the dynamics of a nonlinearsystem; and the design and implementation of experimentalset-ups of two studied products.

The investigation of research efforts shows that nonlinearparts are frequently included in products. Most common areparts that are nonlinear due to impacts and friction. Twoimportant areas are identified; to study coupling effectsbetween nonlinear subsystems and to study how nonlinearanalysis can be used to improve existing designs.

Considering the studied products; a pantograph on a trainand a Braille printer, it can be concluded that thecharacteristics of a part can largely affect the dynamicbehaviour of the product. Typical nonlinear behaviour, such ascoexisting solutions and irregular motions, do occur. Theanalysis of the pan- tograph motion shows important aspects toconsider in the modelling process; coupling effects. In thecase of the Braille printer it is shown possible to create alow-cost control, by taking advantage of an existingdiscontinuity, to achieve a desired motion.

Altogether, this work contributes to improved understandingof the be- haviour of nonlinear parts in products, especiallythose including impacts, pro- viding greater knowledge aboutaspects to consider in the design process.

Keywords:Nonlinear Dynamics, Impacts, Discontinuities,Subsystems, Chaos, Irregular Behaviour, Printer Dynamics,Suspensions, Coupled Systems, Control.

Place, publisher, year, edition, pages
Stockholm: KTH, 2004. x, 54 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2004:07
Keyword
Nonlinear Dynamics, Impacts, Discontinuities, Subsystems, Chaos, Irregular Behaviour, Printer Dynamics, Suspensions, Coupled Systems, Control
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-3734 (URN)
Public defence
2004-04-29, 00:00
Note
QC 20100621Available from: 2004-05-07 Created: 2004-05-07 Last updated: 2010-06-21Bibliographically approved

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Jerrelind, JennyStensson, Annika

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