Passive, remote and omnidirectional suppression of sound source radiation via an acoustic superscatterer
Abstract: Effective control of the sound source directly is the fundamental solution to the noise problem. Herein, we propose a passive, non-closed, and remote scheme for omnidirectional reduction of the sound power radiated from vibrating sources. The physical mechanism of this scheme is to design an acoustic superscatterer based upon the idea of transformation media so that the virtual boundary of the acoustic superscatterer can overlap with the radiation boundary of the sound source to construct drastic multiple scattering effects. Through theoretical analyses and numerical simulations, we confirm the effectiveness of adopting the acoustic superscatterer to significantly suppress the sound radiation power generated by some typical dipolar sources in the air. Our study shows that by arranging no more than two acoustic superscatterers at the designed positions away from a dipolar thin rod, about 90% of the sound radiation power, i.e., 10 dB, can be suppressed in all directions of the dipole axis. This preliminary work would enlighten the research of using passive methods to achieve non-contact omnidirectional noise control of vibrating sources.
Keywords: numerical simulations / acoustic superscatterer / sound / scheme / dipolar / boundary / radiation / noise
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