Investigation of industrial tea-leaf-fibre waste material for its sound absorption properties

Ersoy, Sezgin; Küçük, Halûk

doi:10.1016/j.apacoust.2007.12.005

Cited by 260 publications

(145 citation statements)

References 8 publications

(6 reference statements)

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“…Sound absorption characteristic of porous material is not so much a function of type material but airflow resistivity and how well material construction can be executed to achieve desirable properties for sound absorbers (Lee and Chen, 2001). Ersoy and Kucuk (2009) have investigated with three different layers of tea-leaf fiber waste materials with and without backing provided by a single layer of woven textile cloth were tested for their sound absorption properties. The experiment show that 1 cm thick tea-leaf-fiber waste material with backing provides sound absorption which almost equivalent to that provided by six layers of woven textile cloth 2 cm thick layers of rigidly backed tea-leaf-fiber and non-woven fiber material exhibit almost equivalent sound absorption in the frequency range between 500 and 3200 Hz.…”

Section: Introductionmentioning

confidence: 99%

Noise Control Using Coconut Coir Fiber Sound Absorber with Porous Layer Backing and Perforated Panel

Zulkifli¹,

Zulkarnain

Nor³

2010

American Journal of Applied Sciences

103

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Problem statement: Noise control was one of the major requirements to improve the living environment. One of the methods to do that is provided by sound absorber. Commonly, multi-layer sound absorbers are applied to absorb broadband noise that was composed of perforated plates, air space and porous material. However, multi-layers sound absorbers effectiveness depends on their construction. This study was conducted to investigate the potential of using coconut coir fiber as sound absorber. The effects of porous layer backing and perforated plate on sound absorption coefficient of sound absorber using coconut coir fiber were studied. Approach: Car boot liners made from woven cotton cloth were used as type of porous layer in the study. This material has been used widely in automotive industry. Perforated plate used was machined with perforation ratio of 0.20, thickness of 1 mm and holed diameter of 2 mm. The samples were tested at the acoustic lab of the Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, according to ASTM E 1050-98 international standards for noise absorption coefficient. Results: The experiment data indicates that porous layer backing can improve noise absorption coefficient at low and high frequencies with significant increasing. 20 mm thick layer coconut coir fiber with porous layer backing exhibit peak value at frequencies between 2750-2825 Hz with maximum value of 0.97. The experimental results also found that the coconut coir fiber with perforated plate gives higher value for lower frequencies range from 600-2400 Hz. The optimum value for coconut coir fiber with perforated panel is around 0.94-0.95 for the frequency range 2600-2700 Hz. Conclusion: Noise absorption coefficient of coconut coir fiber was increased at all frequency when they were backing with Woven Cotton Cloth (WCC). At low frequency, the NAC have significant increasing. This is because WCC have higher flow resistivity than coconut coir fibers, so that sound can be dissipated as it travels through material significantly. The results from the experimental tests show that it has good acoustic properties at low and high frequencies and can used to be an alternative replacement of synthetic based commercial product. By using the porous layer and perforated plate backing to coconut coir fiber, the sound absorber panel shows a good potential to be an environmentally friendly product. This innovative sound absorption panel has a bright future because they are cheaper, lighter and environmentally compare to glass fiber and mineral based synthetic materials.

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Section: Introductionmentioning

confidence: 99%

Noise Control Using Coconut Coir Fiber Sound Absorber with Porous Layer Backing and Perforated Panel

Zulkifli¹,

Zulkarnain

Nor³

2010

American Journal of Applied Sciences

103

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“…Kinerja serapan bunyi merupakan fungsi frekuensi yang umumnya dengan bertambahnya kinerja serapan bunyi efektif pada frekuensi tertentu dapat ditingkatkan salah satunya dengan menambahkan ketebalan [6]. Kinerja mekanik komposit panel sandwich menjadi sangat penting untuk mengetahui perilaku dan respon mekaniknya terhadap beban yang akan diberikan kepada panel dengan mencari nilai Modulus of Rupture (MOR) dan Modulus of Elasticity (MOE).…”

Section: Introductionunclassified

“…Pilihan ka- * E-MAIL: iyahya@mipa.uns.ac.id jian atas kinerja akustik dan kinerja mekanik komposit ampas tebu dan bambu didasarkan pertimbangan bahwa komposit panel sandwich merupakan panel akustik lantai (ubin) yang dapat diaplikasikan pada bangunan. Oleh karena itu, perilaku dan respon akustik serta mekaniknya menjadi sangat penting untuk memenuhi standar yang berlaku untuk panel penyerap bunyi pada bangunan ISO 11654 [5].Kinerja serapan bunyi merupakan fungsi frekuensi yang umumnya dengan bertambahnya kinerja serapan bunyi efektif pada frekuensi tertentu dapat ditingkatkan salah satunya dengan menambahkan ketebalan [6]. Kinerja mekanik komposit panel sandwich menjadi sangat penting untuk mengetahui perilaku dan respon mekaniknya terhadap beban yang akan diberikan kepada panel dengan mencari nilai Modulus of Rupture (MOR) dan Modulus of Elasticity (MOE).…”

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Kinerja Akustik dan Mekanik Panel Sandwich Berbasis Ampas Tebu dan Bambu

Sari

Minardi

Kristiani

et al. 2016

JFA

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IntisariTelah dilakukan pengujian kinerja akustik dan kinerja mekanik panel sandwich berbasis ampas tebu dan bambu. Pengujian kinerja akustik dilakukan secara eksperimen mengacu pada prosedur ASTM E-1050-98 dan kinerja mekanik menggunakan material testing machine. Pada penelitian ini dilakukan variasi ketebalan komposit ampas tebu dan pengaruh penambahan lapisan bambu di permukaan atas dan bawah komposit ampas tebu. Hasil penelitian menunjukkan bahwa pengaruh ketebalan sampel adalah menggeser penyerapan bunyi efektif pada frekuensi rendah sedangkan penambahan lapisan bambu pada komposit ampas tebu mempengaruhi penurunan nilai koefisien serapan bunyi yang dikarenakan tingkat kekerasan tinggi dan porositas rendah pada lapisan bambu. Adapun pengaruh ketebalan terhadap kinerja mekaniknya adalah menurunkan nilai MOR dan MOE sementara pengaruh penambahan lapisan bambu membuat nilai MOR naik dan nilai MOE turun. Pengaruh ketebalan dan penambahan lapisan bambu juga mengubah nilai densitas sampel. AbstractSound absorption performance and mechanical performance have been conducted in panel sandwich based bagasse and bamboo. The testing acoustic performance was conducted experimentally refer to ASTM E-1050-98 standard procedure and mechanical performance using a material testing machine. In this research, thickness variation bagasse composite and bamboo effect of adding a layer on the surface of the upper and lower composite bagasse. The results showed that the influence of the thickness of the sample is to shift the effective sound absorption at low frequencies while adding a layer of bamboo composite bagasse impairment affects the sound absorption coefficient due to a high degree of hardness and low porosity of the lining of bamboo. The effect of thickness on the mechanical performance is to lower the value of MOR and MOE while the effect of adding a layer of bamboo create value MOR MOE values rise and fall. The influence of the layer thickness and the addition of bamboo also change the value of the density of the sample. Pemanfaatan lain dari ampas tebu disajikan pada makalah ini sebagai salah satu alternatif material penyerap bunyi dalam bentuk komposit. Pengaruh ketebalan dan pengaruh penambahan lapisan bambu pada permukaan atas dan bawah komposit ampas tebu terhadap kinerja akustik dan kinerja mekanik telah dikaji berdasarkan pengujian eksperimen. Pilihan ka- * E-MAIL: iyahya@mipa.uns.ac.id jian atas kinerja akustik dan kinerja mekanik komposit ampas tebu dan bambu didasarkan pertimbangan bahwa komposit panel sandwich merupakan panel akustik lantai (ubin) yang dapat diaplikasikan pada bangunan. Oleh karena itu, perilaku dan respon akustik serta mekaniknya menjadi sangat penting untuk memenuhi standar yang berlaku untuk panel penyerap bunyi pada bangunan ISO 11654 [5].Kinerja serapan bunyi merupakan fungsi frekuensi yang umumnya dengan bertambahnya kinerja serapan bunyi efektif pada frekuensi tertentu dapat ditingkatkan salah satunya dengan menambahkan ketebalan [6]. Kinerja mekanik komposit panel sandwich menjadi san...

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“…It was found that coir with the addition of recycled rubber is capable of absorbing sound with an average of 0.6 (sound absorption coefficient) which is caused by filler content. S. Ersoy and H. Küçük [37] have also investigated the sound absorption performance by using tea-leaf fibre and found the comparison between the different configuration of tea-leaf fibre with and without backing provided by a single layer of woven textile cloth. Meanwhile, H. K. Kim and H. K. Lee [38] have investigated the influence of lightweight aggregates on the acoustics properties of porous concrete due to different layers.…”

Section: Sound Absorption Materialsmentioning

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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Investigation of industrial tea-leaf-fibre waste material for its sound absorption properties

Cited by 260 publications

References 8 publications

Noise Control Using Coconut Coir Fiber Sound Absorber with Porous Layer Backing and Perforated Panel

Noise Control Using Coconut Coir Fiber Sound Absorber with Porous Layer Backing and Perforated Panel

Kinerja Akustik dan Mekanik Panel Sandwich Berbasis Ampas Tebu dan Bambu

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

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