Jonas Svensson

Applied Acoustics : People : Recent Graduates : Jonas Svensson

Contact information

Jonas Svensson has graduted and is now working at A2Zound by Semcon.

About

I am from Älvängen, 30km north of Göteborg. I started at Chalmers, Väg och Vatten, in the fall of 2001. After three years of studies I attended the Mater's Programme of Sound and Vibration the years of 2004/2005. I graduated early in 2006 and started my PhD studies briefly after. My research project involves the introduction for active control for vibration control.

On a more personal level I enjoy, as everyone else, the good things in life

such as good food, good music, good movies and the occasional football match.

Reaserch

The research project I am involved in is concerned with vibration control in light-weight structures for vehicle applications. The common strategy to use viscoelastic materials to reduce structural vibrations is inefficient at low frequencies, especially since constraints on cost on environmental impact demand the structures to be light-weight which disqualifies adding mass for damping purposes. An alternative approach to viscoelastic damping materials which ha been under research during the last years is active vibration control (AVC). AVC is the concept of using sensors and actuators together with proper processing units in order to active suppress or alter the mechanical response of a structure.

My contribution concerns ways of combining AVC together with passive damping materials in order to find efficient hybrid solutions. In order for vibrational energy to be transferred from a structure and dissipated in a damping treatment the impedances of the structure and the treatment have to be matched. Otherwise the structural waves will simply be reflected at the impedance miss-match. My research concerns the possibility of increasing the efficiency of a passive damping treatment by using AVC to actively compensate for this impedance miss-match. Something which then hopefully would be efficient also for low frequency vibrations.

Teaching

In the academic year of 2009-2010:

Exercises in the course, Materie- och Vågteori
Lab assistant in TA2
Lab assistant in Sound and Vibration Measurements

Publications

Journal Publications

J.L. Svensson, P.B.U. Andersson, W. Kropp
On the design of structural junctions for the purpose of hybrid passive-active vibration control
Journal of Sound and Vibration (2010) 329(9) p.1274-1288
J.L. Svensson, P.B.U. Andersson, J. Scheuren, W. Kropp
Feedforward control of bending waves in frequency domain at structural junctions using an impedance formulation
Journal of Sound and Vibration (2009) 323(3-5) p.555-573
J.L. Svensson, P.B.U. Andersson, J. Scheuren, W. Kropp
Active scattering control of flexural waves at beam junctions: The influence of beam properties on power flow and control effort
Journal of Sound and Vibration (2008) 313(3-5) p.418-432

Conference proceeding

J. Svensson, E. Rustinghi, B.R. Mace
Investigation of a hybrid passive-active vibration-control configuration.
Proceeding of Internoise in Lisbon, Portugal 13-16 June 1010.
J. Svensson, P. Andersson, W. Kropp
Investigation of a hybrid passive-active vibration-control configuration.
Proceeding of Noise and Vibration: Emerging Methods 08 in Oxford, UK April 5 - 8.
J. Svensson, P. Andersson, W. Kropp
An impedance matching technique for active-passive vibration control
Proceeding of Acoustics 08 (abstract) in Paris, France June30 - July 4.
J. Svensson, P. Andersson, W. Kropp
The influence of material parameters and geometry on an active junction
Proceedings of International Congress on Acoustics in Madrid, Spain; September 2 - 7, 2007
J. Svensson, P. Andersson.
Identification of complex moduli for rubber compounds by minimisation of the error between measured and FE-modelled velocity profiles
Proceedings of EuroNoise2006 in Tampere, Finland; May 30 - June 1, 2006

Theses

Jonas Svensson
An impedance approach to passive-active vibration control
Licentiate thesis, Chalmers University of Technology 2008.