Development of an acoustic filter for parametric loudspeaker using phononic crystals

•An acoustic filter is prototyped in parametric loudspeaker using phononic crystals.•A match of transmission loss is obtained between simulation and experimental results.•A frequency dependence from parametric array effect is detected with proposed filter.•The proposed filter has proved to be effect...

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Bibliographic Details
Published inUltrasonics Vol. 67; pp. 160 - 167
Main Authors Ji, Peifeng, Hu, Wenlin, Yang, Jun
Format Journal Article
LanguageEnglish
Published Netherlands Elsevier B.V 01.04.2016
Subjects
Arrays
Beams (radiation)
Computer simulation
Crystals
Directivity
Gaussian-beam expansion technique
Loudspeakers
Parametric loudspeaker
Phononic crystals
Sound filters
Spurious sound
Transmission loss
Phononic crystals
Parametric loudspeaker
Gaussian-beam expansion technique
Spurious sound
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Summary:•An acoustic filter is prototyped in parametric loudspeaker using phononic crystals.•A match of transmission loss is obtained between simulation and experimental results.•A frequency dependence from parametric array effect is detected with proposed filter.•The proposed filter has proved to be effective and is only needed for small angles. The spurious signal generated as a result of nonlinearity at the receiving system affects the measurement of the difference-frequency sound in the parametric loudspeaker, especially in the nearfield or near the beam axis. In this paper, an acoustic filter is designed using phononic crystals and its theoretical simulations are carried out by quasi-one- and two-dimensional models with Comsol Multiphysics. According to the simulated transmission loss (TL), an acoustic filter is prototyped consisting of 5×7 aluminum alloy cylinders and its performance is verified experimentally. There is good agreement with the simulation result for TL. After applying our proposed filter in the axial measurement of the parametric loudspeaker, a clear frequency dependence from parametric array effect is detected, which exhibits a good match with the well-known theory described by the Gaussian-beam expansion technique. During the directivity measurement for the parametric loudspeaker, the proposed filter has also proved to be effective and is only needed for small angles.
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ISSN:0041-624X
1874-9968
DOI:10.1016/j.ultras.2016.01.013