Directivity based control of acoustic radiation

被引:16
|
作者
Sharma, Gyani Shankar [1 ]
Sarkar, Abhijit [2 ]
机构
[1] Univ New South Wales, Sch Mech & Mfg Engn, Sydney, NSW 2052, Australia
[2] Indian Inst Technol Madras, Dept Mech Engn, Chennai 600036, Tamil Nadu, India
关键词
Directivity control; Sound radiation; Noise control; Novel technique; SOUND RADIATION; TRANSDUCER; NOISE;
D O I
10.1016/j.apacoust.2019.04.031
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
A novel concept of local noise control along specific receiver directions is demonstrated by controlling the directivity of the radiated noise. This method is particularly useful for practical low frequency noise where global noise control is difficult to attain. The directivity pattern of the radiator is controlled by attaching a lumped mass. Arbitrary placement of the point mass on the radiator is shown to increase the acoustic radiation. The mass location to minimize sound pressure in a target direction is obtained using an optimization technique. The possibility of local noise control for target receiver locations in different directions to the radiator is demonstrated and the underlying physical mechanisms are discussed in detail. The reduction of sound pressure at the receiver location with a lumped mass at the optimal location is shown to be much more than that achievable by a uniform distribution of the point mass over the plate. Furthermore, design guidelines are extracted from the computed results which can be of aid to the field engineer. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:226 / 235
页数:10
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