Journal of Vibration and Sound

Journal of Vibration and Sound

Estimation of sound transmission loss in a flat oval channel by statistical energy analysis method

Document Type : research article

Authors
Mehdi Salehi
Alireza Ahmadi
Mechanical Engineering Division, Faculty of Engineering, Islamic Azad University, Najafabad, Iran
Abstract
In this article, an attempt has been made to estimate the amount of sound transmission loss in a flat oval channel by applying the approach of statistical energy analysis. Correct estimation of sound transmission loss in an air conditioning channel is of great importance due to the harmful effects of noise pollution in the environment on human health. Simulation with the statistical energy analysis method is a powerful approach to estimate sound and vibration in problems in which we deal with complex and multi-part systems; is considered. In this method, first, a system is divided into several subsystems, and then by writing a matrix equation that includes the energy exchanges between subsystems and energy loss coefficients; It is investigated from the perspective of vibration and sound estimation.

On average, the model presented in this research is able to estimate the sound transmission loss in different dimensions of the air conditioning channels according to the experimental results in the accuracy range of ± 2.5 dB. Considering that it seems that the results obtained from modeling with this method are in good agreement with the experimental data; The results of this research can be used as an efficient approach to estimate noise in oval shaped channels stretched in different lengths.
Keywords
Statistical analysis of energy
sound transmission loss
air conditioning channel
noise pollution
Subjects
[1] ASHRAE Handbook: HVAC Applications-Chapter 49-NOISE AND VIBRATION CONTROL. 2019.
[2] Stansfeld, Stephen A., and Mark P. Matheson. "Noise pollution: non-auditory effects on health." British medical bulletin 68, no. 1 (2003): 243-257.
]3[   گلمحمدی, رستم. "شاخص‌های پیش بینی صدا در اماکن بسته متداول." مجله علمی صوت و ارتعاش 11, no. 22 (2023): 31-37.‎
[4] Malushte, H.S., Evaluation of Statistical Energy Analysis for prediction of breakout noise from air duct. MSc. Thesis, University of Nebraska-Lincoln, USA, 2013.
[5] Cummings, A. "Sound transmission through duct walls." Journal of Sound and Vibration 239, no. 4 (2001): 731-765.
[6] Yoganandh, M., Jade Nagaraja, and B. Venkatesham. "Prediction of insertion loss of lagging in rectangular duct using statistical energy analysis." Noise Control Engineering Journal 67, no. 6 (2019): 438-446.
[7] Heckl, M., and M. Lewit. "Statistical energy analysis as a tool for quantifying sound and vibration transmission paths." Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences 346, no. 1681 (1994): 449-464.
[8] Sarradj, Ennes. "Energy-based vibroacoustics: SEA and beyond." In CFA/DAGA, pp. 1157-1162. 2004.
[9] Plunt, Juha. "Statistical energy analysis (SEA), Theory and applications." (2010).  https://www.gothenburgsound.se/downloads/pdf/SEAkompEng.pdf,
[10] Craik, Robert JM. "Sound transmission through buildings using SEA." In IUTAM Symposium on Statistical Energy Analysis: Proceedings of the IUTAM Symposium held in Southampton, UK, 8–11 July 1997, pp. 337-348. Dordrecht: Springer Netherlands, 1999.
[11] Craik, R. J. M. "The noise reduction of the acoustic paths between two rooms interconnected by a ventilation duct." Applied Acoustics 12, no. 3 (1979): 161-179.
[12] Cummings, A., and I-J. Chang. "Noise breakout from flat-oval ducts." Journal of sound and vibration 106, no. 1 (1986): 17-33.
[13] Kuttruff, Heinrich. Room acoustics. Crc Press, 2016.
[14] Vér, István L., and Leo L. Beranek, eds. Noise and vibration control engineering: principles and applications. John Wiley & Sons, 2005.
[15] Harvey, Philip D. Engineering properties of steel. ASM International (OH), 1982.
Journal of Vibration and Sound
Volume 13, Issue 25 - Serial Number 25
September 2024
Pages 145-156