Experimental reconstruction of non-stationary sound and vibration sources by means of Transient Planar Near-field Acoustic Holography
2012 (English)In: International Conference on Noise and Vibration Engineering 2012, ISMA 2012, including USD 2012: International Conference on Uncertainty in Structure Dynamics, Katholieke Universiteit Leuven , 2012, Vol. 5, 3631-3643 p.Conference paper (Refereed)
A novel algorithm called Transient Planar Near-field Acoustic Holography is presented to analyse nonstationary sound and vibration sources. The method is able to obtain the time-dependent pressure, particle velocity and intensity field at the source plane without any pre-knowledge of the source by inverse propagation of measured pressure fields. This makes it possible to analyse phenomena like transients and run-ups for all kinds of vibrating and sound radiating objects. Transient responses of thin plates are analysed to experimentally validate the performance of the algorithm. The determined velocity at the center of the plate is validated using a laser vibro-meter directed at the center of the plate and the spatial fields are qualitatively compared with theoretical mode shapes. It is shown that the algorithm is able to analyse transient responses of plates with good quantitative as well as qualitative results.
Place, publisher, year, edition, pages
Katholieke Universiteit Leuven , 2012. Vol. 5, 3631-3643 p.
Acoustic holography, Algorithms, Plates (structural components), Structural dynamics, Transient analysis, Inverse propagation, Nearfield Acoustic Holography, Nonstationary, Novel algorithm, Particle velocities, Pressure field, Spatial fields, Vibration sources
Other Engineering and Technologies
IdentifiersURN: urn:nbn:se:kth:diva-165133ISI: 000321063903052ScopusID: 2-s2.0-84906352691ISBN: 9781622768257OAI: oai:DiVA.org:kth-165133DiVA: diva2:807630
25th International Conference on Noise and Vibration engineering, ISMA2012 in conjunction with the 4th International Conference on Uncertainty in Structural Dynamics, USD 2012, 17 September 2012 through 19 September 2012, Leuven, Belgium
QC 201504242015-04-242015-04-232015-04-24Bibliographically approved