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Nonlinear dynamic behaviour of coupled suspension systems
KTH, Tidigare Institutioner, Farkost- och flygteknik.ORCID-id: 0000-0002-1426-1936
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Fordonsdynamik.ORCID-id: 0000-0002-4048-3452
2003 (Engelska)Ingår i: Meccanica (Milano. Print), ISSN 0025-6455, E-ISSN 1572-9648, Vol. 38, nr 1, s. 43-59Artikel i tidskrift (Refereegranskat) 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.

Ort, förlag, år, upplaga, sidor
Springer, 2003. Vol. 38, nr 1, s. 43-59
Nyckelord [en]
pantograph current collector head, coupled suspensions, impact, nonlinear dynamic behaviour, OSCILLATOR, MOTION
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:kth:diva-13496DOI: 10.1023/A:1022067317220ISI: 000180561900005Scopus ID: 2-s2.0-0037273769OAI: oai:DiVA.org:kth-13496DiVA, id: diva2:325852
Anmärkning

QC 20100621

Tillgänglig från: 2010-06-21 Skapad: 2010-06-21 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. Effects of nonlinear dynamics in engineering systems
Öppna denna publikation i ny flik eller fönster >>Effects of nonlinear dynamics in engineering systems
2001 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2001. s. 19
Serie
Trita-FKT ; 2001:03
Nyckelord
Nonlinear dynamics, Impacts, Subsystems, Chaos, Irregular, Behaviour, Printer Dynamics, Suspensions, Coupled systems
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-1208 (URN)
Anmärkning
QC 20100621Tillgänglig från: 2001-04-02 Skapad: 2001-04-02 Senast uppdaterad: 2010-06-21Bibliografiskt granskad
2. Design and Control of Products Including Parts with Impacts
Öppna denna publikation i ny flik eller fönster >>Design and Control of Products Including Parts with Impacts
2004 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2004. s. x, 54
Serie
Trita-AVE, ISSN 1651-7660 ; 2004:07
Nyckelord
Nonlinear Dynamics, Impacts, Discontinuities, Subsystems, Chaos, Irregular Behaviour, Printer Dynamics, Suspensions, Coupled Systems, Control
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-3734 (URN)
Disputation
2004-04-29, 00:00
Anmärkning
QC 20100621Tillgänglig från: 2004-05-07 Skapad: 2004-05-07 Senast uppdaterad: 2010-06-21Bibliografiskt granskad

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Jerrelind, JennyStensson, Annika

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