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A global control strategy for efficient control of a Braille impact hammer
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Vehicle Dynamics.ORCID iD: 0000-0002-1426-1936
Virginia Polytechnic Institute and State University, Engineering Science and Mechanics, Virginia, USA.
2006 (English)In: Journal of Vibration and Acoustics-Transactions of the ASME, ISSN 1048-9002, E-ISSN 1528-8927, Vol. 128, no 2, 184-189 p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
American Society of Mechanical Engineers , 2006. Vol. 128, no 2, 184-189 p.
National Category
Vehicle Engineering
URN: urn:nbn:se:kth:diva-13498DOI: 10.1115/1.2159033ISI: 000236825400007ScopusID: 2-s2.0-33645805469OAI: diva2:325865

QC 20100621

Available from: 2010-06-21 Created: 2010-06-21 Last updated: 2016-09-27Bibliographically approved
In thesis
1. 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.
Trita-AVE, ISSN 1651-7660 ; 2004:07
Nonlinear Dynamics, Impacts, Discontinuities, Subsystems, Chaos, Irregular Behaviour, Printer Dynamics, Suspensions, Coupled Systems, Control
National Category
Engineering and Technology
urn:nbn:se:kth:diva-3734 (URN)
Public defence
2004-04-29, 00:00
QC 20100621Available from: 2004-05-07 Created: 2004-05-07 Last updated: 2010-06-21Bibliographically approved

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