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In order to explore the vibrations of a loudspeaker cone, this research measures the axial acceleration of hundreds of points on the cone surface employing a Laser Doppler Vibrometer when excited by an exponential swept sine signal. The recorded signal was then transformed into an impulse response by convolution with the matched inverse sweep signal. From the knowledge of the acceleration at each point of the radiating surface, the free field sound pressure on axis at 1-m distance was computed. This research obtained results comparable to Finite Element Method simulations based only on the linear mechanical behavior of the loudspeaker cone without any acoustic interference. Moreover, by comparing the laser measurements of many samples, the researchers evaluated how the influence of known variations in the loudspeaker components or production process influenced the final performances of the device. Postprocessing of experimental results was performed using Matlab scripts, which also computed the deflection shapes of the loudspeaker cone.
Author (s): Bellini, Maria Costanza; Collini, Luca; Farina, Angelo; Pinardi, Daniel; Riabova, Kseniia
Affiliation:
University of Parma, Dept. of Engineering and Architecture, Parma, Italy
(See document for exact affiliation information.)
Publication Date:
2017-07-06
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Permalink: https://aes2.org/publications/elibrary-page/?id=19175
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Bellini, Maria Costanza; Collini, Luca; Farina, Angelo; Pinardi, Daniel; Riabova, Kseniia; 2017; Measurement of Loudspeakers with a Laser Doppler Vibrometer and the Exponential Sine Sweep Excitation Technique [PDF]; University of Parma, Dept. of Engineering and Architecture, Parma, Italy; Paper ; Available from: https://aes2.org/publications/elibrary-page/?id=19175
Bellini, Maria Costanza; Collini, Luca; Farina, Angelo; Pinardi, Daniel; Riabova, Kseniia; Measurement of Loudspeakers with a Laser Doppler Vibrometer and the Exponential Sine Sweep Excitation Technique [PDF]; University of Parma, Dept. of Engineering and Architecture, Parma, Italy; Paper ; 2017 Available: https://aes2.org/publications/elibrary-page/?id=19175
@article{bellini2017measurement,
author={bellini maria costanza and collini luca and farina angelo and pinardi daniel and riabova kseniia},
journal={journal of the audio engineering society},
title={measurement of loudspeakers with a laser doppler vibrometer and the exponential sine sweep excitation technique},
year={2017},
volume={65},
issue={7/8},
pages={600-612},
month={july},}
TY – paper
TI – Measurement of Loudspeakers with a Laser Doppler Vibrometer and the Exponential Sine Sweep Excitation Technique
SP – 600 EP – 612
AU – Bellini, Maria Costanza
AU – Collini, Luca
AU – Farina, Angelo
AU – Pinardi, Daniel
AU – Riabova, Kseniia
PY – 2017
JO – Journal of the Audio Engineering Society
VO – 65
IS – 7/8
Y1 – July 2017