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Proceedings Paper

Experimental determination of air influence on loudspeaker cone vibrations by scanning laser Doppler vibrometry
Author(s): Enrico Esposito; M Navarri; S. Papalini; M Pontillo; Enrico Primo Tomasini; R Toppi
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Paper Abstract

At present the standard procedure of loudspeaker design involves a time consuming path consisting of the production of a limited series of prototypes that are then tested and evaluated in order to check their conformity to prescribed features. If significant discrepancies are found between designated and actual behavior, this procedure is iteratively repeated till an optimal result is reached. Doing so design time may become unacceptably long and makes difficult a systematic approach to loudspeaker development. For these reasons loudspeaker companies are implementing software packages that simulate loudspeaker response and completely eliminate the need of going through the above mentioned methodology. The approach agreed by FAITAL and the Dept. of Mechanics to model loudspeakers diaphragms is based on the simultaneous use of Finite Element Modeling (FEM) software packages and validation measurements by Scanning Laser Doppler Vibrometry (SLDV). Due to the structural complexity of loudspeakers, FEM models may require an excessive number of nodes and calculation time would rise to unpractical limits. To ease simulation requirements, it has been decided to eliminate air contribution from computer simulations. In this work we will experimentally determine which is the contribution of air on a loudspeaker cone vibrations, defming the percentage deviation from the normal functioning situation.

Paper Details

Date Published: 22 May 2002
PDF: 11 pages
Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); doi: 10.1117/12.468190
Show Author Affiliations
Enrico Esposito, Univ. degli Studi di Ancona (Italy)
M Navarri, Fabbrica Italiana Altoparlanti (Italy)
S. Papalini, Univ. degli Studi di Ancona (Italy)
M Pontillo, Fabbrica Italiana Altoparlanti (Italy)
Enrico Primo Tomasini, Univ. degli Studi di Ancona (Italy)
R Toppi, Fabbrica Italiana Altoparlanti (Italy)

Published in SPIE Proceedings Vol. 4827:
Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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