scholarly journals Active noise barrier minimizing pressure gradient.

2010 ◽  
Vol 128 (4) ◽  
pp. 2286-2286
Author(s):  
Carl R. Hart ◽  
Siu‐Kit Lau
Keyword(s):  
Pressure Gradient ◽  
Active Noise ◽  
Noise Barrier

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

2019 ◽  
Vol 18 (04) ◽  
pp. 1930002 ◽  
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.

scholarly journals 628 A Noise Barrier Using Active Noise Control Technique

2011 ◽  
Vol 2011 (0) ◽  
pp. _628-1_-_628-8_
Author(s):  
Xnn WANG ◽  
Shinya KIJIMOTO ◽  
Yosuke KOBA
Keyword(s):  
Noise Control ◽  
Active Noise Control ◽  
Control Technique ◽  
Active Noise ◽  
Noise Barrier

1319 Basic study on improvement of active noise control system for noise barrier : Phase-3: BEM Simulation

2009 ◽  
Vol 2009.47 (0) ◽  
pp. 463-464
Author(s):  
Hiroaki KAWASAKI ◽  
Masaharu NISHIMURA ◽  
Naoki KANAMORI ◽  
Toshiyuki WATANABE
Keyword(s):  
Control System ◽  
Noise Control ◽  
Active Noise Control ◽  
Phase 3 ◽  
Basic Study ◽  
Active Noise ◽  
Noise Barrier

scholarly journals An active noise barrier with unidirectional secondary sources

2011 ◽  
Vol 72 (12) ◽  
pp. 969-974 ◽  
Author(s):  
Weisong Chen ◽  
Wei Rao ◽  
Hequn Min ◽  
Xiaojun Qiu
Keyword(s):  
Secondary Sources ◽  
Active Noise ◽  
Noise Barrier

scholarly journals Suitability of Active Noise Barriers for Construction Sites

2020 ◽  
Vol 10 (18) ◽  
pp. 6160
Author(s):  
Shahin Sohrabi ◽  
Teresa Pàmies Gómez ◽  
Jordi Romeu Garbí
Keyword(s):  
Noise Control ◽  
Noise Source ◽  
Active Noise Control ◽  
Target Area ◽  
Construction Sites ◽  
Noise Barriers ◽  
Active Noise ◽  
Noise Barrier ◽  
Passive Noise ◽  
Suitable Location

Barriers are increasingly used to protect the pedestrian and neighboring buildings from construction noise activities. This study aims to investigate the suitability of applying active noise control on barriers in a construction site to protect the street area and neighboring buildings. Transducers that are simulated in this work are close to the barrier, and their optimal positions are defined in such a way that the control system has the maximum performance at the neighboring areas close to the construction sites. To begin with, the suitable location of the control sources is found when the total squared pressure is minimized at the positions of noise receivers. The suitable location of the error sensors is, then, found when the control sources are fixed at the position of the previous step and the total squared pressure is minimized at the error sensors. The best location for the error sensors is defined when the maximum reduction is achieved in the target area. It is observed that suitable positions for the transducers depend on the location of target areas for noise control, the position of the noise source, and its operating frequency. In this investigation, a unique configuration is proposed for the transducers that achieves a comparable reduction both at the street area and the neighboring buildings, simultaneously. The results show that the active noise barrier with a height of 2.5 m can achieve an extra insertion loss in the street zone, varies from 9.3 to 16.4 dB (in comparison with passive noise barrier) when the distance of the noise source from the barrier changes in the range of 7 to 1 m, respectively. Those values are of the same order for the passive noise attenuation. Furthermore, similar results are achieved when attempting to cancel the shadow zone of a façade 15 m away from the barrier.

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