Acoustic properties of eco-friendly Micro-Perforated Panel (MPP) incorporating animal fibers
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کد مقاله : 1009-ISAV2024 (R3)
نویسندگان
محمد حسین بهشتی ایوری 1 ، علی خوانین2 ، علی عالمی1 ، علی صفری واریانی3 ، Musli Nizam Bin Yahya4 ، فرحناز خواجه نصیری5
1دانشگاه علوم پزشکی گناباد
2دانشگاه تربیت مدرس
3دانشگاه علوم پزشکی قزوین
4Tun Hussein Onn University of Malaysia (UTHM), 86400 Parit Raja, Batu Pahat, Johor, Malaysia
5علوم پزشکی تهران
چکیده
Micro-perforated panels (MPPs) are innovative alternatives to traditional sound-absorbing materials, though they exhibit limitations in efficiency at high frequencies, rendering them unsuitable for interior wall finishes. Enhancing their performance involves incorporating porous materials into the air gap. Natural materials, like sheep, goat, and camel wool, are emerging as sustainable substitutes for synthet-ic sound insulators. This study assessed the sound absorption coefficients of wool-based insulating materials and analyzed MPPs backed by wool composites of varying thickness using an impedance tube per ISO 10534-2. The impact of pore shape, perforated plate thickness, and wool composites in the air gap were investigated. Results revealed that camel wool demonstrated the highest sound absorp-tion performance, achieving a maximum absorption coefficient of 0.95 at frequencies above 1000 Hz. The maximum sound absorption coefficient of MPPs generally occurs in the medium frequency range (800–1500 Hz), shifting to lower frequencies with increased panel thickness without altering the ab-sorption bandwidth. Similarly, sugarcane fiber composites with varying thicknesses showed that a 1 cm-thick wool composite reached a peak SAC of 95% at 3500 Hz, shifting to lower frequencies as thickness increased. Importantly, the pore shape and porosity did not significantly affect SAC, high-lighting the limited impact of these factors. The incorporation of wool composites in the air gap nota-bly enhanced SAC and broadened the absorption bandwidth, particularly at lower frequencies. How-ever, this enhancement came at the cost of reduced SAC at higher frequencies, making MPPs with wool composites unsuitable for managing sounds above 3000 Hz. Nonetheless, MPPs backed by wool composites provide an environmentally responsible option for low-frequency sound management. Their reduced ecological footprint and improved acoustic performance at lower frequencies under-score their potential for sustainable acoustic solutions This study highlights the viability of integrating natural materials like wool into acoustic designs, achieving both superior sound absorption and sus-tainability. By focusing on lower-frequency sound control, MPPs with natural backing materials emerge as a promising alternative in the field of eco-friendly acoustic engineering.
کلیدواژه ها
Title
Acoustic properties of eco-friendly Micro-Perforated Panel (MPP) incorporating animal fibers
Authors
mohammad hosein beheshti, Ali Khavanin, ali Alami, ali safari, Musli Nizam Bin Yahya, Farahnaz Khajenasiri
Abstract
Micro-perforated panels (MPPs) are innovative alternatives to traditional sound-absorbing materials, though they exhibit limitations in efficiency at high frequencies, rendering them unsuitable for interior wall finishes. Enhancing their performance involves incorporating porous materials into the air gap. Natural materials, like sheep, goat, and camel wool, are emerging as sustainable substitutes for synthet-ic sound insulators. This study assessed the sound absorption coefficients of wool-based insulating materials and analyzed MPPs backed by wool composites of varying thickness using an impedance tube per ISO 10534-2. The impact of pore shape, perforated plate thickness, and wool composites in the air gap were investigated. Results revealed that camel wool demonstrated the highest sound absorp-tion performance, achieving a maximum absorption coefficient of 0.95 at frequencies above 1000 Hz. The maximum sound absorption coefficient of MPPs generally occurs in the medium frequency range (800–1500 Hz), shifting to lower frequencies with increased panel thickness without altering the ab-sorption bandwidth. Similarly, sugarcane fiber composites with varying thicknesses showed that a 1 cm-thick wool composite reached a peak SAC of 95% at 3500 Hz, shifting to lower frequencies as thickness increased. Importantly, the pore shape and porosity did not significantly affect SAC, high-lighting the limited impact of these factors. The incorporation of wool composites in the air gap nota-bly enhanced SAC and broadened the absorption bandwidth, particularly at lower frequencies. How-ever, this enhancement came at the cost of reduced SAC at higher frequencies, making MPPs with wool composites unsuitable for managing sounds above 3000 Hz. Nonetheless, MPPs backed by wool composites provide an environmentally responsible option for low-frequency sound management. Their reduced ecological footprint and improved acoustic performance at lower frequencies under-score their potential for sustainable acoustic solutions This study highlights the viability of integrating natural materials like wool into acoustic designs, achieving both superior sound absorption and sus-tainability. By focusing on lower-frequency sound control, MPPs with natural backing materials emerge as a promising alternative in the field of eco-friendly acoustic engineering.
Keywords
Micro-Perforated Panel, MPP, noise, adsorption