scholarly journals Improving sound transmission loss at ring frequency of a curved panel using tunable 3D-printed small-scale resonators

2019 ◽  
Vol 145 (1) ◽  
pp. EL72-EL78 ◽  
Author(s):  
Christophe Droz ◽  
Olivier Robin ◽  
Mohamed Ichchou ◽  
Noureddine Atalla
Keyword(s):  
Transmission Loss ◽  
Sound Transmission ◽  
Small Scale ◽  
Sound Transmission Loss ◽  
Curved Panel ◽  
3D Printed ◽  
Ring Frequency

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 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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