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Sound Absorption Characteristics of Pineapple Leaf/Epoxy Composite

Adhika Damar Rastri, Prasetiyo Iwan, Noeriman Abiyoga, Hidayah Nurul, Widayani S.

Archives of Acoustics

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2020

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Vol. 45, No. 2

233--240

EN

Natural fibres are attractive as the raw material for developing sound absorber, as they are green, eco-friendly, and health friendly. In this paper, pineapple leaf fibre/epoxy composite is considered in sound absorber development where several values of mechanical pressures were introduced during the fabrication of absorber composite. The results show that the composite can absorb incoming sound wave, where sound absorption coefficients αn > 0.5 are pronounced at mid and high frequencies. It is also found that 23.15 kN/m2 mechanical pressure in composite fabrication is preferred, while higher pressure leads to solid panel rather than sound absorber so that the absorption capability reduces. To extend the absorption towards lower frequency, the composite absorber requires thickness higher than 3 cm, while a thinner absorber is only effective at 1 kHz and above. Additionally, it is confirmed that the Delany-Bazley formulation fails to predict associated absorption behavior of pineapple leaf fibre-based absorber. Meanwhile, a modified Delany-Bazley model discussed in this paper is more useful. It is expected that the model can assist further development of the pineapple leaf composite sound absorber.

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On Woven Fabric Sound Absorption Prediction

Prasetiyo I., Desendra G., Hermanto M. N., Adhika D. R.

Archives of Acoustics

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2018

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Vol. 43, No. 4

707--715

EN

For building applications, woven fabrics have been widely used as finishing elements of room interior but not in particular aimed for sound absorbers. Considering the micro perforation of the woven fabrics, they should have potential to be used as micro-perforated panel (MPP) absorbers; some measurement results indicated such absorption ability. Hence, it is of importance to have a sound absorption model of the woven fabrics to enable us predicting their sound absorption characteristic that is beneficial in engineering design phase. Treating the woven fabric as a rigid frame, a fluid equivalent model is employed based on the formulation of Johnson-Champoux-Allard (JCA). The model obtained is then validated by measurement results where three kinds of commercially available woven fabrics are evaluated by considering their perforation properties. It is found that the model can reasonably predict their sound absorption coefficients. However, the presence of perturbations in pores give rise to inaccuracy of resistive component of the predicted surface impedance. The use of measured static flow resistive and corrected viscous length in the calculations are useful to cope with such a situation. Otherwise, the use of an optimized simple model as a function of flow resistivity is also applicable for this case.

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Przegrody dwuścienne z rdzeniami dźwiękochłonnymi z materiałów ziarnistych

Sikora J., Turkiewicz J.

Izolacje

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2007

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R. 12, nr 10

28-33

PL

W artykule przedstawiono wyniki badań na temat izolacyjności akustycznej przegród przydatnych w projektowaniu zintegrowanych obudów dźwiękochłonno-izolacyjnych z zastosowaniem materiałów ziarnistych jako rdzeni dźwiękochłonnych w przegrodach dwuściennych, a także opracowane przez autorów klasyfikacje przegród dźwiękochłonno-izolacyjnych i materiałów dźwiękochłonnych stosowanych w projektowaniu zabezpieczeń przeciwhałasowych.