A study of an actively controlled noise barrier

Akira Omoto, K. Fujiwara

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

This paper describes an application of active control of sound diffracted by a barrier. The basis of this application is the cancellation of the sound pressure at the diffraction edge, which behaves like a virtual source to the diffracted field. Several points on the edge were canceled simultaneously by several secondary sources to get a large attenuation over a wide area. While many factors appear to influence the effectiveness of active control, the points of cancellation on the diffraction edge and the arrangement of the secondary sources were studied. The optimum conditions for control were investigated using numerical simulation. These conditions were then confirmed experimentally using multichannel adaptive signal processing. It was found that control is stable and effective when the intervals of the points of cancellation on the edge are shorter than half of the wavelength, and that attenuation is greatest when the secondary sources are nearest the primary source.

Original languageEnglish
Pages (from-to)2173-2180
Number of pages8
JournalJournal of the Acoustical Society of America
Volume94
Issue number4
DOIs
Publication statusPublished - Jan 1 1993

Fingerprint

cancellation
active control
attenuation
sound pressure
diffraction
signal processing
Controlled
intervals
acoustics
wavelengths
simulation
Attenuation
Sound
Signal Processing
Primary Source
Arrangement
Simulation

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

A study of an actively controlled noise barrier. / Omoto, Akira; Fujiwara, K.

In: Journal of the Acoustical Society of America, Vol. 94, No. 4, 01.01.1993, p. 2173-2180.

Research output: Contribution to journalArticle

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