Portable Low-Frequency Noise Reduction Device for Both Small Open and Closed SpacesReport as inadecuate




Portable Low-Frequency Noise Reduction Device for Both Small Open and Closed Spaces - Download this document for free, or read online. Document in PDF available to download.

Shock and Vibration - Volume 2016 2016, Article ID 6241935, 11 pages -

Research Article

Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China

School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China

Received 17 April 2015; Revised 6 September 2015; Accepted 8 September 2015

Academic Editor: Carlo Trigona

Copyright © 2016 Chao Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Noise pollution has been given more attention due to its negative impacts on human health and disease. The portable low-frequency noise reduction device we developed in this research can provide an effective way for solving low-frequency noise pollution problem in the small space. This work describes the design principle and the prototype structures for two versions of V1.5 and V2.0 and builds the noise test systems for small spaces, respectively. These devices, installed on the outer surface of the small spaces, can automatically identify the noise spectrum and implement noise reduction by means of the active noise control ANC technology. The testing results indicate that the noise can be reduced 12 dB in the range of 250 Hz~400 Hz for the small closed space while, for the small open space, the best effect of 5.88 dB occurs in the optimal frequency of 450 Hz. These effects will be weakened with the increasing distance away from the source and show the obvious axisymmetric distribution in the inverted cone space.





Author: Chao Wang, Haiyang Gao, Liyao Yu, Tiantian Yu, Wenhui Yan, and Qiumeng Xue

Source: https://www.hindawi.com/



DOWNLOAD PDF




Related documents