Analysis of Noise Level and Sound Transmission Loss (STL) of Noise Barrier Material for the Construction Site

2021 ◽  
Vol 13 (4) ◽  
Author(s):  
W. H. Tan ◽  
◽  
S. Amares ◽  
W. Faridah ◽  
W. K. Heng ◽  
...  
Keyword(s):  
Sound Source ◽  
Noise Level ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Small Scale ◽  
Sound Transmission Loss ◽  
Aluminium Foil ◽  
Barrier Material ◽  
Barrier Materials ◽  
Noise Barrier

The construction activities are commonly known as the noisy and annoying work that affects a human’s routine. Those students and lecturers whose location are at the noise receptor locations might be suffering from the health impairment. The objective of this study is to assess and determine the noise level present throughout the daytime period (9AM - 12PM and 2PM - 5PM) at respective measurement points. The analysis of noise spectrum of the sound source from 125 Hz to 4 kHz is part of the scope of study as well. The analysis was carried out by comparing the recommended safe noise level with the equivalent continuous sound level (LAeq) and sound pressure level (Lp) gathered from this study. By setting up a barrier to shield or enclose the sound source is the common way to control the noise transmission. Therefore, selection of the best noise barrier materials is based on the sound transmission loss (STL) value. In this study, the experiment STL of four different types of noise barrier material (newspaper, aluminium foil, cotton and EPS foam) also was carried out in the small scale of reverberation chambers equipped with the LMS Test Lab and LMS SCADAS Mobile device. The 16 tested one-third octave frequency band ranging from 125 Hz to 4 kHz had been utilized in this study. The results revealed that the material of newspaper produced the STL ranging from 0 dB to 9.7 dB within the low frequency of 125 Hz to 800 Hz. Meanwhile, the aluminium foil, had the optimum performance with at least 5.4 dB and above for the STL value at higher frequency ranging from 1 kHz to 4 kHz. Generally, the newspaper is considered as the best noise barrier material as it able to reduce the noise level more throughout the selected frequency range in this study.

scholarly journals Analytical Expression for Sound Transmission Loss Calculation: An Improvement to the Existing Method after Singh and Katra

2009 ◽  
Vol 2009 ◽  
pp. 1-3
Author(s):  
Iwan Yahya
Keyword(s):  
Sound Source ◽  
Spectral Decomposition ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Test Sample ◽  
Sound Transmission Loss ◽  
Impedance Tube ◽  
Analytical Expression ◽  
Time Signals ◽  
Short Time

An analytical expression for measuring of sound transmission loss (TL) has been developed by using two microphones, an impedance tube and an impulse sound source as a proposed improvement to the existing procedure after Singh and Katra (1978). The calculation procedure is based on the autospectrum of short-time signals captured by the two microphones placed on two opposite positions from test sample while the sound source is on its surface. No spectral decomposition is required and the TL is calculated directly from the autospectrums of captured signals.

scholarly journals Normal Incidence of Sound Transmission Loss of a Double-Leaf Partition Inserted with a Microperforated Panel

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
A. Putra ◽  
A. Y. Ismail ◽  
R. Ramlan ◽  
Md. R. Ayob ◽  
M. S. Py
Keyword(s):  
Mathematical Model ◽  
Transmission Loss ◽  
Low Frequency ◽  
Sound Transmission ◽  
Normal Incidence ◽  
Sound Transmission Loss ◽  
Engineering Structures ◽  
Air Mass ◽  
Noise Barrier ◽  
The Mathematical Model

A double-leaf partition in engineering structures has been widely applied for its advantages, that is, in terms of its mechanical strength as well as its lightweight property. In noise control, the double-leaf also serves as an effective noise barrier. Unfortunately at low frequency, the sound transmission loss reduces significantly due to the coupling between the panels and the air between them. This paper studies the effect of a microperforated panel (MPP) inserted inside a double-leaf partition on the sound transmission loss performance of the system. The MPP insertion is proposed to provide a hygienic double-leaf noise insulator replacing the classical abrasive porous materials between the panels. It is found that the transmission loss improves at the troublesome mass-air-mass resonant frequency if the MPP is located closer to the solid panel. The mathematical model is derived for normal incidence of acoustic loading.

Building Materials Composition Influence to Sound Transmission Loss (STL) Reduction

2013 ◽  
Vol 789 ◽  
pp. 242-247 ◽  
Author(s):  
Erni Setyowati ◽  
Anggana Fitri Sadwikasari
Keyword(s):  
Noise Level ◽  
Building Materials ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Sound Transmission Loss ◽  
Noise Sources ◽  
Simple Material ◽  
Building Models ◽  
Specific Orientation ◽  
Level Reduction

The development of the airport always causes the noise impact to the surrounding environment.1Housing close to the airport will be annoyed by the aircraft noise, especially if the building is not added by absorber building materials. Housing lay out towards the runways as noise sources is also an aspect that should be considered. This research resulted building models equipped by simple material compositions that had capability in reducing the airport noise optimally. The decrease of the noise level found out from the research is caused by the value of Sound Transmission Loss (STL) of the building materials composition. The models of housing are laid out with a number of specific orientation angles towards the runway and resulted values of the highest noise level reduction.

scholarly journals Analysis of the transmission loss of double-leaf panels with an equivalent spring–mass model for studs

2020 ◽  
Vol 37 ◽  
pp. 126-133
Author(s):  
Yuan-Wei Li ◽  
Chao-Nan Wang
Keyword(s):  
Distribution Curve ◽  
Transmission Loss ◽  
Sound Transmission ◽  
Experimental Results ◽  
Sound Insulation ◽  
Sound Transmission Loss ◽  
Mass Model ◽  
Steel Stud ◽  
Panel Thickness ◽  
Stiffness Distribution

Abstract The purpose of this study was to investigate the sound insulation of double-leaf panels. In practice, double-leaf panels require a stud between two surface panels. To simplify the analysis, a stud was modeled as a spring and mass. Studies have indicated that the stiffness of the equivalent spring is not a constant and varies with the frequency of sound. Therefore, a frequency-dependent stiffness curve was used to model the effect of the stud to analyze the sound insulation of a double-leaf panel. First, the sound transmission loss of a panel reported by Halliwell was used to fit the results of this study to determine the stiffness of the distribution curve. With this stiffness distribution of steel stud, some previous proposed panels are also analyzed and are compared to the experimental results in the literature. The agreement is good. Finally, the effects of parameters, such as the thickness and density of the panel, thickness of the stud and spacing of the stud, on the sound insulation of double-leaf panels were analyzed.

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