Investigating the Geometrical Distribution Effect of Micro-Perforated Panel Orifices on its Acoustic Behavior
Hatem Khalaf Mohamed Teleb;
Abstract
Title of Thesis: Investigating the Geometrical Distribution Effect of Micro-Perforated Panel Orifices on its Acoustic Behavior
Institution: National Institute of Standards – Acoustics Department.
Noise pollution has become one of the most pressing concerns affecting humanity in recent years, as it has a negative impact on both mental and physical health, as well as posing psychological dangers.
Development an effective technologies to combat all types of pollution is one of the principal axes of the Egyptian 2030 strategic plan in order to work towards sustainable improvement of quality of life and raising awareness about the protection of the environment and providing clean and healthy surroundings.
To satisfy this necessity, a lot of eco-friendly studies are being done in many fields. This trend is also obvious in the field of acoustics, where there are great efforts to replace the traditional sound absorbing materials such as porous and fibrous sound absorbers with fiber-free materials such as micro-perforated panel absorbers (MPP).
MPP is regarded a promising absorber for noise reduction because it has a lot of benefits for instance; high strength, good wash-ability, elegant appearance, low manufacturing costs and can be used in severe environmental circumstances. They consist of a distribution of minute orifices of diameter "d" on a panel of thickness "t" with perforation ratio "σ" in front of an air layer of thickness "L". Where, these parameters are controlling the value of the sound absorption coefficient, and the bandwidth of the frequency range of interest.
The purpose of this study is to obtain a wideband low frequency sound absorber. And that can be satisfied by investigating theoretically and experimentally the effect of geometrical distribution pattern of orifices (holes) on the panel surface, geometrical hole shape, hole diameter, perforation ratio, panel thickness and interstitial air gaps on the acoustic behavior of single and double metal MPP sound resonators.
Institution: National Institute of Standards – Acoustics Department.
Noise pollution has become one of the most pressing concerns affecting humanity in recent years, as it has a negative impact on both mental and physical health, as well as posing psychological dangers.
Development an effective technologies to combat all types of pollution is one of the principal axes of the Egyptian 2030 strategic plan in order to work towards sustainable improvement of quality of life and raising awareness about the protection of the environment and providing clean and healthy surroundings.
To satisfy this necessity, a lot of eco-friendly studies are being done in many fields. This trend is also obvious in the field of acoustics, where there are great efforts to replace the traditional sound absorbing materials such as porous and fibrous sound absorbers with fiber-free materials such as micro-perforated panel absorbers (MPP).
MPP is regarded a promising absorber for noise reduction because it has a lot of benefits for instance; high strength, good wash-ability, elegant appearance, low manufacturing costs and can be used in severe environmental circumstances. They consist of a distribution of minute orifices of diameter "d" on a panel of thickness "t" with perforation ratio "σ" in front of an air layer of thickness "L". Where, these parameters are controlling the value of the sound absorption coefficient, and the bandwidth of the frequency range of interest.
The purpose of this study is to obtain a wideband low frequency sound absorber. And that can be satisfied by investigating theoretically and experimentally the effect of geometrical distribution pattern of orifices (holes) on the panel surface, geometrical hole shape, hole diameter, perforation ratio, panel thickness and interstitial air gaps on the acoustic behavior of single and double metal MPP sound resonators.
Other data
| Title | Investigating the Geometrical Distribution Effect of Micro-Perforated Panel Orifices on its Acoustic Behavior | Other Titles | دراسة تأثير التوزيع الهندسى للثقوب الميكرونية للألواح المثقبه على سلوكها الصوتى | Authors | Hatem Khalaf Mohamed Teleb | Issue Date | 2021 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| BB11108.pdf | 684.37 kB | Adobe PDF | View/Open |
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