Acoustic horns can enhance the overall efficiency of loudspeakers to emanate highly directional acoustic waves. In this work, a theoretical model is developed to predict difference frequency acoustic fields generated by a parametric array loudspeaker (PAL) with a flared horn. Based on this model, analytical solutions are obtained for exponentially horned PALs. A numerical analysis on the performance of horned PALs subject to various horn parameters (i.e., horn length and flare constant) is implemented. To compare with nonhorned parametric acoustic array (PAA) devices, it is able to generate highly directional acoustic wave beams for a wide range of difference frequencies, in which the generated sound pressure levels at low frequencies can be significantly enhanced. In addition, the equivalent radius of a nonhorned emitter that matches the directivity achieved by a horned one is also quantitatively investigated. The present research will provide useful guidelines for the design and optimization of horned parametric array equipment.
Highly Directional Acoustic Waves Generated by a Horned Parametric Acoustic Array Loudspeaker
East China Jiaotong University,
Nanchang 330013, Jiangxi, China
and Logistics of Guangdong,
Higher Education Institutes,
Zhuhai 519070, Guangdong, China
Suzhou 215131, Jiangsu, China
Contributed by the Noise Control and Acoustics Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received April 10, 2018; final manuscript received June 25, 2018; published online August 13, 2018. Assoc. Editor: Ronald N. Miles.
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Tong, L. H., Lai, S. K., Yan, J. W., and Li, C. (August 13, 2018). "Highly Directional Acoustic Waves Generated by a Horned Parametric Acoustic Array Loudspeaker." ASME. J. Vib. Acoust. February 2019; 141(1): 011012. https://doi.org/10.1115/1.4040771
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