COMPARISON OF NORMAL INCIDENT SOUND ABSORPTION COEFFICIENT OF DIRECT PIERCING CARVED WOOD PANEL FOR CIRCULAR, GEOMETRY AND FLORAL DESIGN
DOI:
https://doi.org/10.11113/jt.v78.9177Keywords:
Normal incidence sound absorption coefficient, direct piercing carved wood panel, sound intensity method, Boundary Element MethodAbstract
Direct Piercing Carved Wood Panel (DPCWP) is among the famous Malay wood carving art in the Malay culture. It is the best example of Malay people’s creativity and masterpiece. In this paper, the comparison of normal incidence sound absorption coefficient,  (SAC) for three major types of design for the DPCWP is discussed. The simplest form of DPCWP, the circular type, then the geometry and floral types were investigated based on simulation and measurement works using sound intensity method to determine the normal incidence SAC, for 30% and 40% perforation ratios. The simulation work was carried out by using BEASY Acoustic software based on Boundary Element Method (BEM). From the results, there is an identical trend for DPCWP with geometry and floral design from 250 Hz to 4 kHz. At high frequencies (1 kHz to 4 kHz), both design show the tendency of decrement, suggesting that the complexity of the design does affect the average SAC value. However, for circular design, SAC is higher than other design at 1 kHz and shows a similar trend with other design at 2 kHz and 4 kHz for both simulation and measurement result.
References
Rosnawati Othman. 2005. The language of Lankasukan motif, Indonesia and the Malay World. Journal of Indonesia and Malay World. 33(96): 97-111.
Ismail Said. 2005. Criteria for Selecting Timber Species in Malay Woodcarving. Journal of Asian Architecture and Building Engineering. 4: 17-23.
[Mohd Zamri Jusoh, Mohamad Ngasri Dimon, Nazli Che Din and Toru Otsuru. 2014. Application of In Situ Method for Measuring Sound Absorption Coefficient of Direct Piercing Carved Wood Panel with Daun sireh Motif. Journal of Applied Mechanics and Materials. 471: 273-278.
Mohd Zamri Jusoh, Mohamad Ngasri Dimon, You Kok Yeow, Nazli Che Din and Rafidah Rosman. 2013. Normal Incidence Sound Absorption Coefficient Of Direct Piercing Carved Wood Panel With Daun Sireh Motif Using Boundary Element Method. International Journal of Automotive and Mechanical Engineering. 7: 1043.
Mohamad Ngasri Dimon, Siti Dhalia Adzim, Hasnizom hassan, Nor Azliza and Mohd Zamri Jusoh. 2010. Good Speech Intelligibility Through Novel Acoustics Material Of Geometric Perforated Panel In Mosques. International Symposium on Room Acoustics. ISRA. 29-31.
Farina A. and Torelli A.1997. Measurement of the Sound Absorption Coefficient of Materials with Sound Intensity Technique. Audio Engineering Society Convention. 102 - 4409.
Jacobsen F. 1997. An Overview of the Source of error in Sound Power Determine Using the Sound Intensity Technique. Journal of Applied Acoustic. 50(2): 155-166.
Gade S. 1985. Validity of Intensity Measurements in Partially Diffuse Sound Field. Bruel and Kjaer Technical Review. 4: 3-31.
Mohamad Ngasri Dimon. 2006. The Study of Normal Incidence Sound Absorption Coefficience (Sound Absorption) of Wood Circular Perforated Panel (CPP) using Numerical Modeling Technique, Universiti Teknologi Malaysia. Research report Vot 75117. 117-118.
Fahy F.J. 1995. Sound Intensity. 2nd Edition. E&FN Spon, London. 170-171.
Mohamad Ngasri Dimon. 2002. Normal Incidence Sound Transmission Coefficient Prediction Using Sound Intensity Technique, Universiti Teknologi Malaysia. PhD Thesis. 209-210.
Mohamad Ngasri Dimon. 2009. Normal Incidence Sound Absorption Coefficience of Direct Piercing Carved Wood Panels (DPCWP) With Geometric Pattern. Universiti Teknologi Malaysia. Research report Vot 79013. 9-13.
Downloads
Published
Issue
Section
License
Copyright of articles that appear in Jurnal Teknologi belongs exclusively to Penerbit Universiti Teknologi Malaysia (Penerbit UTM Press). This copyright covers the rights to reproduce the article, including reprints, electronic reproductions, or any other reproductions of similar nature.
