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Design and Control of Products Including Parts with Impacts
KTH, Tidigare Institutioner                               , Farkost- och flygteknik.ORCID-id: 0000-0002-1426-1936
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 [en]
Nonlinear Dynamics, Impacts, Discontinuities, Subsystems, Chaos, Irregular Behaviour, Printer Dynamics, Suspensions, Coupled Systems, Control
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:kth:diva-3734OAI: oai:DiVA.org:kth-3734DiVA, id: diva2:9576
Disputation
2004-04-29, 00:00
Anmärkning
QC 20100621Tillgänglig från: 2004-05-07 Skapad: 2004-05-07 Senast uppdaterad: 2010-06-21Bibliografiskt granskad
Delarbeten
1. Nonlinear dynamics of parts in engineering systems
Öppna denna publikation i ny flik eller fönster >>Nonlinear dynamics of parts in engineering systems
2000 (Engelska)Ingår i: Chaos, Solitons & Fractals, ISSN 0960-0779, E-ISSN 1873-2887, Vol. 11, nr 15, s. 2413-2428Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

By definition, chaotic vibrations arise from nonlinear deterministic physical systems or non-random differential or difference equations. In numerous engineering systems there exist nonlinearities which might affect the dynamic behaviour of the system. The objectives in this work are to summarise previous work on nonlinear dynamics of engineering parts and products and to investigate if research on how nonlinear parts can effect the total behaviour of the products have been performed. It is found that common nonlinear parts are machine elements such as gears, bearings, brakes and suspension systems. The most studied part in a product is of impact hammer type. The products are ordinary products, from searing machines, drilling machines and printers to railway vehicles. In order to be able to design reliable products the methodology should be further developed to enable use by engineers. One can conclude that the effect of nonlinear parts on the total system behaviour is still a fairly uninvestigated area.

Ort, förlag, år, upplaga, sidor
Elsevier, 2000
Nyckelord
SQUEEZE FILM DAMPER, GEAR-PAIR, INJECTION PARAMETERS, STABILITY ANALYSIS, IMPACT RESPONSE, VIBRATION, MOTION, BEHAVIOR, CHAOS, MODEL
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-13495 (URN)10.1016/S0960-0779(00)00016-3 (DOI)000089455100002 ()
Anmärkning

QC 20100621

Tillgänglig från: 2010-06-21 Skapad: 2010-06-21 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
2. Nonlinear dynamic behaviour of coupled suspension systems
Öppna denna publikation i ny flik eller fönster >>Nonlinear dynamic behaviour of coupled suspension systems
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
Nyckelord
pantograph current collector head, coupled suspensions, impact, nonlinear dynamic behaviour, OSCILLATOR, MOTION
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-13496 (URN)10.1023/A:1022067317220 (DOI)000180561900005 ()2-s2.0-0037273769 (Scopus ID)
Anmärkning

QC 20100621

Tillgänglig från: 2010-06-21 Skapad: 2010-06-21 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
3. Braille printer Dynamics
Öppna denna publikation i ny flik eller fönster >>Braille printer Dynamics
1999 (Engelska)Ingår i: Proceedings of the ASME Design Engineering Technical Conferences, 1999Konferensbidrag, Publicerat paper (Övrigt vetenskapligt)
Nationell ämneskategori
Maskinteknik
Identifikatorer
urn:nbn:se:kth:diva-13494 (URN)
Konferens
ASME Design Engineering Technical Conferences
Anmärkning

QC 20100621

Tillgänglig från: 2010-06-21 Skapad: 2010-06-21 Senast uppdaterad: 2016-09-27Bibliografiskt granskad
4. Low-Cost Control of Impact Hammer Performance
Öppna denna publikation i ny flik eller fönster >>Low-Cost Control of Impact Hammer Performance
2003 (Engelska)Ingår i: ASME Conference Proceedings: Design Engineering Technical Conferences, ASME Press, 2003, Vol. 2003, s. 1547-1554Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

This paper considers the dependence of the performance of a Braille printer impact hammer on system parameters, specifically the lag time between subsequent current pulses and the location of a back stop constraining the oscillations of the hammer core. Here, the goal is to improve the printer speed while maintaining readability of the Braille type and preventing tears in the paper. Based on observations of the limit sets for the hammer-core dynamics, a low-cost feedback control algorithm is proposed for affecting the stability of otherwise unstable periodic oscillations with more desirable operating characteristics.

Ort, förlag, år, upplaga, sidor
ASME Press, 2003
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-13497 (URN)10.1115/DETC2003/VIB-48486 (DOI)
Konferens
19th Biennial Conference on Mechanical Vibration and Noise
Anmärkning

QC 20100621

Tillgänglig från: 2010-06-21 Skapad: 2010-06-21 Senast uppdaterad: 2016-09-29Bibliografiskt granskad
5. A global control strategy for efficient control of a Braille impact hammer
Öppna denna publikation i ny flik eller fönster >>A global control strategy for efficient control of a Braille impact hammer
2006 (Engelska)Ingår i: Journal of Vibration and Acoustics-Transactions of the ASME, ISSN 1048-9002, E-ISSN 1528-8927, Vol. 128, nr 2, s. 184-189Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A combined control scheme relying on feedback-based local control in the vicinity of periodic system responses and global control based on a coarse-grained approximation to the nonlinear dynamics is developed to achieve a desirable dynamical behavior of a Braille printer impact hammer The proposed control methodology introduces discrete changes in the position of a system discontinuity at opportune moments during the hammer motion while the hammer is away from the discontinuity, thereby exploiting the recurrent contacts with the discontinuity to achieve the desired changes in the transient dynamics. It is argued that, as the changes in the position of the discontinuity affect the motion only indirectly through changes in the timing and state at the subsequent contact, the control actuation can be applied over an interval of time during the free-flight motion as long as it is completed prior to contact. A forced, piecewise smooth, single-degree-of freedom model of a Braille impact hammer is used to illustrate the methodology and to yield representative numerical results.

Ort, förlag, år, upplaga, sidor
American Society of Mechanical Engineers, 2006
Nationell ämneskategori
Farkostteknik
Identifikatorer
urn:nbn:se:kth:diva-13498 (URN)10.1115/1.2159033 (DOI)000236825400007 ()2-s2.0-33645805469 (Scopus ID)
Anmärkning

QC 20100621

Tillgänglig från: 2010-06-21 Skapad: 2010-06-21 Senast uppdaterad: 2017-12-12Bibliografiskt granskad

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