Sound transmission across plenum windows with non-parallel glass panes

Pao Yue-kong Library Electronic Theses Database

Sound transmission across plenum windows with non-parallel glass panes

 

Author: Sheng, Shiyu
Title: Sound transmission across plenum windows with non-parallel glass panes
Degree: M.Eng.
Year: 2015
Subject: Windows -- Acoustic properties.
Soundproofing.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: xi, 75 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2826123
URI: http://theses.lib.polyu.edu.hk/handle/200/8219
Abstract: With the continuous development of economy and the progress of the society, urban construction has been built so that the density of cities has been increasing. Hong Kong could be as a typical example of the densely populated city with over 7 million people living, while 85% of land is hilly area. Like many developed cities, Hong Kong is facing serious traffic noise pollution, which could be a serious threat to normal life of resident. Noise pollution is paid serious attention by the government, while many scholars have studied how to control noise effectively. But in the past researches, some prevention and control measures have lots of disadvantages. For example, noise barriers could lead to the space more congest. In addition, some redesign of room structure would be adverse for natural ventilation. The urgent task is to find a way, which can alleviate noise annoyance effectively to people, at the same time it can guarantee that natural ventilation keeps in a good standard. A new design called plenum windows modified by Tong and Tang [3] has been used at PolyU Homantin Hostel Halls of Residence, which can solve the problems of noise effectively under the demand of satisfactory building environment standard.The aim of this paper is to investigate the sound transmission across plenum windows with non-parallel glass panes based on Tong and Tang's [3] study. Total three variables have been used in this experiment. They were opening window sizes (1/2H, 1/3H, 1/4H), tilt angles of plenum windows(-5°,0°,+5°) and noise source distances (0.5m,1m,1.5m,2m,2.5m,3m) respectively. A 1:4 scaled model was set up to measure test data.13 microphones received the noise generated from the speakers to record SPL, which could used to calculate noise reduction and insertion loss to estimate the acoustical performance. To sum up, direction scenarios(both +5 degree and -5 degree)will increase the value of IL comparing no tilting case(0 degree) when the opening window size is not very small. Small window size test (1/4H) showed a satisfactory performance on noise isolation in most cases. With distances between the model and noise source enlarging, the insertion loss showed a declining trend. However, due to some space and time limitation some other important parameters had been not taken into account in this experiment, such as size of plenum windows, the orientation of noise source and location floor of building. The limitations and errors of this experiment will be further optimized in next study.

Files in this item

Files Size Format
b28261239.pdf 20.91Mb PDF
Copyright Undertaking
As a bona fide Library user, I declare that:
  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
  3. I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.

     

Quick Search

Browse

More Information