Highly directional acoustic waves generated by a horned parametric acoustic array loudspeaker

[+] Author and Article Information
L. H. Tong

School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, Jiangxi, China

S. K. Lai

Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China

J. W. Yan

Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes, Jinan University, Zhuhai, Guangdong, China

C. Li

School of Urban Rail Transportation, Soochow University, Suzhou, Jiangsu, China

1Corresponding author.

ASME doi:10.1115/1.4040771 History: Received April 10, 2018; Revised June 25, 2018


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 with a flared horn. Based on this model, analytical solutions are obtained for exponentially horned parametric array loudspeakers. A numerical analysis on the performance of horned parametric array loudspeakers subject to various horn parameters (i.e., horn length and flare constant) is implemented. To compare with non-horned parametric acoustic array 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 non-horned 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.

Copyright (c) 2018 by ASME
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