Utilizing Sugarcane Wasted Fibers as a Sustainable Acoustic Absorber

Putra, Azma; Abdullah, Yasseer; Efendy, Hady; Farid, Wan Mohd; Ayob, Razali; Py, Muhammad Sajidin

doi:10.1016/j.proeng.2013.02.081

Cited by 78 publications

(37 citation statements)

References 9 publications

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“…A use of fabric as the facing for the sample is also found to significantly improve the sound absorption. In another study for wasted fibres from the sugarcane bagasse, Putra et al (2013b) shows that a 13 mm thick sugarcane fibre sample can have absorption coefficient of around 0.65 above 1.2 kHz. This is also shown to be comparable with the performance of the glass wool of the same thickness.…”

Section: Introductionmentioning

confidence: 98%

Utilizing Hollow-Structured Bamboo as Natural Sound Absorber

Putra¹,

Khair²,

Nor³

2015

Archives of Acoustics

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Studies to find alternative low environmental-impact materials for acoustic absorbers are still progressing, particularly those originated from natural materials. However, most of the established works are mainly focused on the fibrous-type absorbers. Discussion on the non-fibrous-type absorbers is still lacking and this therefore becomes the objective of this paper. Use of bamboo by utilizing its hollow structure to absorb sound energy is discussed here. The normal incidence absorption coefficient was measured based on the length and diameter of the bamboo, as well as different arrangement of the bamboo structure subjected to the incidence sound, namely, axial, transverse, and crossed-transverse arrangements. The trend of absorption coefficient appears in peaks and dips at equally spacing frequencies. For all arrangements the peak of absorption can reach above 0.8. Introducing an air gap behind the bamboo shifts the peak absorption to lower frequency. Covering the front surface of the absorber improves the sound absorption coefficient for axial arrangement by widening the frequency range of absorption also towards lower frequency range. The transverse arrangement is found to have average absorption coefficient peaks of 0.7 above 1.5 kHz. By arranging the bamboo structure with crossed-transverse arrangement, the suppressed absorption peaks in normal transverse arrangement can be recovered.

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Section: Introductionmentioning

confidence: 98%

Utilizing Hollow-Structured Bamboo as Natural Sound Absorber

Putra¹,

Khair²,

Nor³

2015

Archives of Acoustics

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“…According to a study on the sugarcane bagasse fiber material as a sound absorber, Azma Putra et al 13 found similar sound absorption coefficients to a commercial insulating fabric, above 0.5 for frequencies between 1,000 Hz and 3,000 Hz. In this study, the authors concluded that sugarcane bagasse fiber materials demonstrate good sound absorption properties for this frequency range.…”

Section: Characteristics Of Medium Frequenciesmentioning

confidence: 99%

Acoustic Characterization of Sugarcane Bagasse Particleboard Panels (Saccharum officinarum L)

et al. 2015

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“…It was found that the increase in the percentage of coconut coir up to 20% is suitable to be made as sound absorbing material due to the good properties of coconut coir which are cellular, light and porous. A. Putra et al [41] conducted a study on sugarcane wasted fibres as a sustainable acoustic absorber with a diameter of 5 to 10 mm in length and it was found that sugarcane absorbers that possess ½ inch in thickness affects the acoustical performance which is better than commercial sound absorptive material. Moreover, the size of materials will also influence the acoustic absorption.…”

Section: Size Of Materialsmentioning

confidence: 99%

“…From the studies, it was found that the mixture with a thickness of 1 cm containing oyster shells and white cement has the largest potential to absorb sound. Meanwhile, A. Putra et al [41] also investigated the effect of the thickness of an innovative absorbent made from tea leaf fibre and it was found that the sound absorption coefficient of tea leaf fibre with a thickness of 10mm is similar when compared with traditional absorbers such as polyester. The increase in sound absorption was due to the increase in sample thickness.…”

Section: Thicknessmentioning

confidence: 99%

A Comprehensive Review on the Effectiveness of Existing Noise Barriers commonly used in the Railway Industry

et al. 2016

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Abstract. Nowadays, advanced development and sophisticated new technology have led to various types of environmental pollution such as water, air, land, thermal pollution and so on. Recently, however, noise pollution is becoming one of the major threats to the world especially in urban areas where it adversely affects the quality of life of the public. In Malaysia, the Department of Environment has identified that the average transportation noise levels in major cities in peninsular Malaysia are 71.6 dB (A) and 70.4 dB (A) during the day and night respectively. The noise is usually emitted by airplanes, trains, vehicles, motorcycles, trucks and etc. Even though rail transport requires less energy and emits less hazardous substances, it has contributed to noise pollution issues and several health hazards among urban inhabitants such as deafness, nervous breakdowns, mental disorder, heart troubles, high blood pressure, headaches, dizziness, inefficiency and insomnia. Therefore, many studies attempt to reduce noise pollution by applying noise barriers at noise polluted areas via various approaches. This paper aims to explore the effectiveness of noise barriers using noise absorption performance due to several factors such as type of absorbent materials, material thickness, density, porosity and design. This research has found that the thicker the specimen and the denser the absorbent material, the better the sound absorption performance. Besides that, barrier design also plays a major role in determining its effectiveness, where the effectiveness of noise barriers should be high and long enough to break the line-of-sight between the sound source and the receiver. There are several methods that can be used to measure the effectiveness of noise barriers such as the Adrienne Method (in-situ measurement method) and impedance tube method (laboratory measurement method) to measure the acoustic absorption. Nevertheless, the impedance tube measurement method provides the most precise results with the least measurement uncertainty as it only required small samples of the material.

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Utilizing Sugarcane Wasted Fibers as a Sustainable Acoustic Absorber

Cited by 78 publications

References 9 publications

Utilizing Hollow-Structured Bamboo as Natural Sound Absorber

Utilizing Hollow-Structured Bamboo as Natural Sound Absorber

Acoustic Characterization of Sugarcane Bagasse Particleboard Panels (Saccharum officinarum L)

A Comprehensive Review on the Effectiveness of Existing Noise Barriers commonly used in the Railway Industry

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