The Acoustical Analysis of Insertion Losses of Ceiling Materials
Keywords:Sound Enclosure, Acoustic Insertion Loss, Sound Pressure Level, Acoustic Ceiling Material, Frequency Analyser
This study concentrates on measuring, analyzing and recommending the ceiling materials most suited for the reduction of distinct frequency noise levels with focus on rain noise. A frequency analyzer has been used to measure and obtained accurate sound level (LP) data of the rain noise outside, and inside five buildings with diverse acoustical ceiling materials in South Eastern Nigeria. It was done with and without the ceiling partition (or noise barrier) for the audio and narrow frequency band without contribution from other outdoor-related noise sources. Insertion losses of the ceiling materials were calculated using the data obtained from the measured LP. Result obtained from the analysis indicated that the ceiling material found to effectively reduce the noise levels from external noise source. The type for speech reception threshold frequencies of more than 125 Hz and higher audiometric range was moabi wood with peak LP of 21.20 dB at 500 Hz. While for lower frequencies where the ears are least responsive was plaster of Paris (POP) with peak LP of 12.61 dB at 62.5 Hz. This makes “moabi wood” most suitable in lecture rooms, conference halls and large auditoriums as ceiling material, in consideration of its capability to provide notable attenuation of rain noise within the building. This is in accordance with several other studies done on this subject. In general, at much low frequencies and frequencies greater than 2k Hz significant reduction in the rain noise level was observed.
L.A. AL-Rahman, R.I. Raja, and R.A. Rahman. Attenuation of noise by using absorption materials and barriers: A review. International Journal of Engineering and Technology 2(7): 1207–1217 (2012).
W. Babisch. Traffic noise and cardiovascular disease: Epidemiological review and synthesis. Noise and Health 2(8): 9–32 (2000).
R.R. Davis, P. Kozel, and L.C. Erway. Genetic influences in individual susceptibility to noise: A review. Noise and Health 5(20): 19–28 (2003).
A.A. Abiodun, O.T. Oyelola, E.O. Popoola, and A.I. Babatunde. Assessing noise levels in a commercial and industrial centres of Lagos Metropolis. Continental Journal of Water, Air and Soil Pollution 2(2): (2012).
L. Goines, and L. Hagler. Noise pollution: A modern plague. Southern Medical Journal 100(3): 287–294 (2007).
Brüel & Kjaer. Measurements in building acoustics. Brüel & Kjaer Booklet, DK – 2850, Naerum, Denmark (1988).
H-S Kim, J-S Kim, S-H Lee, and Y-H Seo. A simple formula for insertion loss prediction of large acoustical enclosures using statistical energy analysis method. International Journal of Naval Architecture and Ocean Engineering 6(4): 894–903 (2014).
D.A. Bies, and C.H. Hansen. Engineering noise control: Theory and practice (2nd edition). E and FN Spon., London (1996).
J.M. Martinez-Orozco, and A. Barba. Determination of insertion loss of noise barriers in Spanish roads. Applied Acoustics 186(3): 108435 (2022).
D.N. May. Freeway noise and high-rise balconies. Journal of the Acoustical Society of America 65: 699–704 (1979).
H.H. Eldien, and P. Woloszyn. Prediction of the sound field into high-rise building facades due to balcony ceiling form. Applied Acoustics 63: 431–440 (2004).
H.H. Eldien, and P. Woloszyn. The acoustical influence of balcony depth and parapet form: Experiments and simulations. Applied Acoustics 66: 533–551 (2005).
P.J. Lee, Y.H. Kim, J.Y. Joen, and K.D. Song. Effects of apartment building facade and balcony design on the reduction of exterior noise. Building Environment 42: 3517–3528 (2007).
R. Rylander, and D.R. Dunt. Traffic noise exposure planning. Journal of Sound and Vibration 151(3): 54–56 (1991).
X. Song, and Q. Li. Numerical and experimental study on noise reduction of concrete LRT bridges. Science of the Total Environment 643: 208–224 (2018).
W. Sun, L. Liu, H. Yuan, and Q. Su. Influence of top shape on noise reduction effect of high-speed railway noise barrier. IOP Conference Series Materials Science and Engineering 493: 012043 (2019).
J. Lázaro, M. Pereira, P.A. Costa, and L. Godinho. Performance of low-height railway noise barriers with porous materials. Applied Sciences 12(6):2960 (2022).
E.P. Obot, and D.E. Oku. Propagation of electromagnetic waves in some public buildings in Cross River State, Nigeria. European Scientific Journal 10(3): 474–484 (2014).