Tan Wei Hong
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Preferred name
Tan Wei Hong
Official Name
Tan, Wei Hong
Alternative Name
Tan, W. H.
Hong, T. W.
Hong, Tan Wei
Main Affiliation
Scopus Author ID
56416988300

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Acoustic characteristic of Bio-Composite Micro-Perforated Panel (BC-MPP) backed with natural fiber

2023 , Faridah Wahab , Tan Wei Hong , Mohamad Haziman Mohamad Azhar , Nor Hafizul Hilni Abdul Rahman

We investigated the sound absorption properties of a bio-composite microperforated panel (BC-MPP) with a combination of backed-structure and several types of natural fibers such as loofah, kapok, and coconut coir. The sound absorption coefficient (SAC) of different combinations of natural fibers samples was obtained by using a two-microphone impedance tube. In addition, three models, including Delany-Bazley model, Maa theory, and electroacoustical analogy, were employed to estimate the SAC value of natural fiber, BC-MPP, and BC-MPP with a backed structure, respectively. The experimental results demonstrate that the SAC value was increased to almost 0.99 as compared to BC-MPP alone when natural fiber was introduced at the back of BC-MPP either by insertion in the hole of backed structure or attached directly at the back of BC-MPP. The SAC peak also shifted to a lower frequency bandwidth with the highest peak obtained at 930 Hz, 800 Hz and 640 Hz for MPP with coconut husk, BC-MPP with kapok and BC-MPP with loofah, respectively. The absorption frequency was also observed slightly wider than BC-MPP without natural fiber. In comparison of BC-MPP with loofah and BC-MPP with others natural fibers, the insertion of kapok and coconut coir in the hole of backed structure provides a wider effective sound absorption coefficient. The comparison of experimental result with the theoretical calculation shows that the SAC obtained from experiment provides higher SAC value over the theoretical model for both BC-MPP and BC-MPP backed structure.

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Sound absorption coefficient measurement and analysis for multisection perforation microperforated panel

2024-01-01 , Tan Wei Hong , Faridah Wahab , Fauziah Che Mat , Chan C.K. , Teoh R.J.

The microperforated panel (MPP) is a resonant-type sound-absorbing material considered the next-generation sound-absorption material due to its attractive characteristics. However, the drawback of narrow bandwidth sound absorption remains a matter of concern. This study explored the impact of varying backing cavity depths and different combinations of multi-section perforation sizes on the sound absorption performance of microperforated panels (MPP). A two-microphone impedance tube was used to obtain the sound absorption coefficient (SAC) of MPP following the ISO 10534-2 standard. MPP with single-size perforation diameters of 0.5, 0.7, and 1.0 mm which were compared to multi-section MPP with combinations perforation sizes of 0.5 & 0.7, 0.7 & 1.0, and 0.5 & 1.0 mm. The investigation reveals that increasing the backing cavity depth from 1.0 cm to 3.0 cm generally shifts the sound absorption coefficient (SAC) peak to a lower frequency range and decreases the SAC peak across all MPP samples. A higher SAC peak and wider absorption bandwidth were achieved from 0.5 mm single-size perforation diameter MPP and its combination in multi-section perforation MPP.

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Analysis of Sound Transmission Loss on Perforated-Natural Fibre Sandwich Panels

2020-01-01 , Tan Wei Hong , Ak, Yong Hooi

Sound transmission loss (STL) is a study about the sound energy that is prevented from transmitting through a wall or a partition, it is essential especially for noise insulation applications. The main aim of this study is to investigate and analyse the STL capability of perforated-natural fibre sandwich panels, which acted as sound insulation material. The objective of this study is to determine the effect of perforation diameter of perforated panel on STL, as well as to determine the optimum hybridisation combination sandwich panel of perforated panel with natural fibre that deliver good STL. In this study, STL measurement was carried out by using two-load impedance tube method coupled with LMS Test Lab software and LMS SCADAS Mobile DAQ system. Natural fibres used in this study are coconut fibre, oil palm fibre, and pineapple leaf fibre. The natural fibres were prepared in cylindrical shape with three different thicknesses of 1 cm, 2 cm, and 3 cm to fit into the sample holder of impedance tube. Each natural fibre will be tested after it was hybridised with a perforated panel of different perforation diameter size and the STL measurement results are obtained and analysed. The measurement results show all samples had reached their highest STL at the frequency range 3000 Hz to 4000 Hz. In addition, pineapple leaf fibre hybridised with a perforated panel of 3 mm's perforation diameter is considered the optimum combination where it achieved the highest STL of 71.80 dB among all the test samples.

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Sound absorption coefficient measurement and analysis of bio-composite micro perforated panel (BC-MPP)

2023 , Tan Wei Hong , Lee Jia Jian , Faridah Wahab , Siti Hajar Ishak

The sound absorption performance of bio-composite micro-perforated panel (BC-MPP) made from composite polypropylene (PP) filled rice husk (PP/RH), and coconut coir (PP/CC) is presented. The sound absorption coefficient (SAC) of BC-MPP was obtained via the impedance tube two-microphone method, and the investigation was according to types of fillers, filler compositions, perforation ratio, and the air gap size. It was found that the SAC of BC-MPP PP/RH provides a higher SAC value than BC-MPP PP/CC. Furthermore, the SAC peak was observed to shift to the lower frequency spectrum when there was an increment in filler content, the distance between the perforation, and the air gap size. The SAC value from the simulation also shows a good agreement with the experimental result.

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