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research-article

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
lhtong@ecjtu.edu.cn

S. K. Lai

Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
sk.lai@polyu.edu.hk

J. W. Yan

Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes, Jinan University, Zhuhai, Guangdong, China
tyanjianwei@jnu.edu.cn

C. Li

School of Urban Rail Transportation, Soochow University, Suzhou, Jiangsu, China
licheng@suda.edu.cn

1Corresponding author.

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

Abstract

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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