Experimental determination of air influence on loudspeaker cone vibrations by scanning laser Doppler vibrometry

Enrico Esposito; M Navarri; S. Papalini; M Pontillo; Enrico Primo Tomasini; R Toppi

doi:10.1117/12.468190

22 May 2002 Experimental determination of air influence on loudspeaker cone vibrations by scanning laser Doppler vibrometry

Enrico Esposito, M Navarri, S. Papalini, M Pontillo, Enrico Primo Tomasini, R Toppi

Author Affiliations +

Proceedings Volume 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2002) https://doi.org/10.1117/12.468190
Event: Fifth International Conference on Vibration Measurements by Laser Techniques, 2002, Ancona, Italy

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.

Citation Download Citation

Enrico Esposito, M Navarri, S. Papalini, M Pontillo, Enrico Primo Tomasini, and R Toppi "Experimental determination of air influence on loudspeaker cone vibrations by scanning laser Doppler vibrometry", Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); https://doi.org/10.1117/12.468190

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