Change search
ReferencesLink to record
Permanent link

Direct link
Low-Cost Control of Impact Hammer Performance
KTH, Superseded Departments, Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-1426-1936
Virginia Polytechnic Institute and State University, Virginia, USA.
2003 (English)In: ASME Conference Proceedings: Design Engineering Technical Conferences, ASME Press, 2003, Vol. 2003, 1547-1554 p.Conference paper (Refereed)
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.

Place, publisher, year, edition, pages
ASME Press, 2003. Vol. 2003, 1547-1554 p.
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-13497DOI: 10.1115/DETC2003/VIB-48486OAI: diva2:325862
19th Biennial Conference on Mechanical Vibration and Noise

QC 20100621

Available from: 2010-06-21 Created: 2010-06-21 Last updated: 2016-09-29Bibliographically 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

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Jerrelind, Jenny
By organisation
Aeronautical and Vehicle Engineering
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 32 hits
ReferencesLink to record
Permanent link

Direct link