A Boundary Element Approach to Optimization of Active Noise Control Sources on Three-Dimensional Structures

This paper presents the theoretical development of an approach to active noise control (ANC) applicable to three-dimensional radiators. The active noise control technique, termed ANC Optimization Analysis, is based on minimizing the total radiated power by adding secondary acoustic sources on the primary noise source. ANC Optimization Analysis determines the optimum magnitude and phase at which to drive the secondary control sources in order to achieve the best possible reduction in the total radiated power from the noise source/control source combination. For example, ANC Optimization Analysis predicts a 20 dB reduction in the total power radiated from a sphere of radius α at a dimensionless wavenumber ka of 0.125, for a single control source representing 2.5 percent of the total area of the sphere. ANC Optimization Analysis is based on a boundary element formulation of the Helmholtz Integral Equation, and thus, the optimization analysis applies to a single frequency, while multiple frequencies can be treated through repeated analyses.

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Numerical Evaluation of the Performance of Active Noise Control Systems

Journal of Vibration and Acoustics ◽

10.1115/1.2930117 ◽

1990 ◽

Vol 112 (2) ◽

pp. 230-236 ◽

Cited By ~ 11

Author(s):

C. G. Mollo ◽

R. J. Bernhard

Keyword(s):

Boundary Element ◽

Control Systems ◽

Noise Control ◽

Noise Source ◽

Numerical Technique ◽

Active Noise Control ◽

Boundary Element Methods ◽

Single Input Single Output ◽

Active Noise ◽

Analytical Approaches

Most of the approaches to the prediction of the effectiveness of active noise control systems are analytical in nature. Analytical approaches are limited to active noise control systems where a solution to the governing acoustic wave equation is available. The objective of the investigation presented in this paper was to develop a generalized numerical technique for evaluating the optimal performance of active noise controllers. The numerical technique used as the basis of the numerical analysis is the indirect boundary element method (IBEM). Boundary element methods have been shown to be straightforward and accurate numerical methods for the prediction of the acoustic response of a system. The IBEM numerical procedures are used here to derive the active noise controllers for optimal control of enclosed harmonic sound fields where the noise source strengths or the enclosure boundary description may not be known. Detectors are introduced into the system to deduce the unknown noise source strengths. The performance prediction for a single input, single output system is presented. Analysis of the stability and observability of the active noise control system employing detectors is also presented.

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Optimization of secondary source locations for active noise control in three-dimensional spaces

10.2514/6.1993-4420 ◽

1993 ◽

Author(s):

D. Holger ◽

J. Yang

Keyword(s):

Noise Control ◽

Active Noise Control ◽

Three Dimensional ◽

Secondary Source ◽

Active Noise

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Reduction of low-frequency resonance utilizing active noise control system in enclosed three-dimensional space

Acoustical Science and Technology ◽

10.1250/ast.33.106 ◽

2012 ◽

Vol 33 (2) ◽

pp. 106-108

Author(s):

Ken Kaneuchi ◽

Koichi Nishimura

Keyword(s):

Control System ◽

Noise Control ◽

Dimensional Space ◽

Active Noise Control ◽

Three Dimensional ◽

Low Frequency ◽

Frequency Resonance ◽

Active Noise ◽

Three Dimensional Space

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Experiments on optimization of active noise control on a three‐dimensional extended radiator

The Journal of the Acoustical Society of America ◽

10.1121/1.2028299 ◽

1990 ◽

Vol 87 (S1) ◽

pp. S62-S62

Author(s):

Jeffery A. Giordano ◽

Kenneth A. Cunefare ◽

Gary Koopmann

Keyword(s):

Noise Control ◽

Active Noise Control ◽

Three Dimensional ◽

Active Noise

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A Review of Active Noise Control Applications on Noise Barrier in Three-Dimensional/Open Space: Myths and Challenges

Fluctuation and Noise Letters ◽

10.1142/s0219477519300027 ◽

2019 ◽

Vol 18 (04) ◽

pp. 1930002 ◽

Cited By ~ 2

Author(s):

Hsiao Mun Lee ◽

Zhaomeng Wang ◽

Kian Meng Lim ◽

Heow Pueh Lee

Keyword(s):

Open Space ◽

Noise Control ◽

Active Noise Control ◽

Three Dimensional ◽

Construction Site ◽

Noise Sources ◽

Current State ◽

Active Noise ◽

Noise Barrier ◽

Passive Noise

Active noise control (ANC), with counteracting sound in exact equal magnitude and opposite phase to the noise to be controlled, is often considered as a potential solution for solving complex noise problems. However, there are both myths and challenges in its implementations. In a crowded city like Singapore, many noise sources from construction site and subway track are located very close to the residential and commercial buildings. It was suggested by few researchers that by placing suitable control speakers at the construction site (working principle of ANC), the noise from the construction site could be prevented from propagating to the surrounding buildings. Similarly, for viaduct or subway track, by placing control speakers along the viaduct or track, the noise generated by the passing trains or vehicles could be reduced based on the principle of ANC technique. However, implementation of ANC technique on these noise issues is not easy as all of these noise control problems involve multiple noise sources with complex or transient frequency spectrum in large three-dimensional/open space. Therefore, the main intention of the present paper is to discuss the current state of the art of this topic as well as to examine the potential application and limitation of the ANC technique in mitigating unwanted noise, particularly in large three-dimensional/open space and with cooperation of passive noise barrier.

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