A Novel Acoustic Micro-Perforated Panel (MPP) Based on sugar cane fibers and bagasse

Abstract BACKGROUND: Natural materials are becoming a reliable alternative to traditional artificial materials used in sound absorption insulation OBJECTIVE: The present study was conducted to investigate the acoustic insulation of Micro-Perforated Panel (MPP) Based on sugar cane fibers and bagasse as an available, and environmentally friendly material. METHOD: absorption properties of single and double-leaf natural Micro-Perforated Panels (MPP) made of bagasse and also non-natural MPPs made of Plexiglass were measured using an impedance tube based on ISO 10534-2. Then the effect of bagasse and sugar cane fibers composite on the Air gap of MPP was investigated. RESULT: The results showed the peak of the sound absorption of the bagasse composite is in the range of 1000 to 2000 Hz, and the sugarcane fiber composite has a higher sound absorption coefficient than the bagasse composite. Also, natural MPPs have a higher absorption coefficient than non-natural MPPs at all frequencies, and as the panel thickness increases, the peak absorption coefficient shifts to lower frequencies. The peak of the sound absorption coefficient of double-leaf MPPs made of bagasse is 76%, in the range of 160 to 200 Hz. Using sugarcane fiber composite in the Air Gap of single and double-leaf natural MPPs causes the absorption peak to shift to frequencies below 100 Hz. CONCLUSION: According to the results, natural MPPs have a high sound absorption coefficient at low frequencies. These panels can control sounds with much lower frequencies, especially in a double layer and along with cane fiber composite in their Air Gap.