Engineering and Applied Sciences
Volume 5, Issue 3, June 2020, Pages: 50-55
Received: Apr. 9, 2020;
Accepted: May 22, 2020;
Published: Jun. 3, 2020
Views 341 Downloads 150
Shulun Mak, School of Science and Technology, The Open University of Hong Kong, Ho Man Tin, Kowloon, Hong Kong SAR, China
Chiho Li, School of Science and Technology, The Open University of Hong Kong, Ho Man Tin, Kowloon, Hong Kong SAR, China
Waifan Tang, School of Science and Technology, The Open University of Hong Kong, Ho Man Tin, Kowloon, Hong Kong SAR, China
Chiwing Lai, School of Science and Technology, The Open University of Hong Kong, Ho Man Tin, Kowloon, Hong Kong SAR, China
Sound Producing Toys consists the sound emitting characteristics to attract children’s attention, such as emitting music or simulating animal’s call. The excess sound pressure level (SPL) could damage the human hearing. The international toy safety standards are established to limit the maximum sound pressure level emitted from the product. The Chief Executive of the Hong Kong SAR established the Task Force on Economic Challenges (TFEC) on October 2008. In early 2009, the TFEC has identified six economic areas where Hong Kong enjoys clear advantages. The Six Industries are (i) testing, inspection and certification (TIC), (ii) medical services, (iii) innovation and technology, (iv) cultural and creative industries, (v) environmental industries, and (vi) educational services. The Open University of Hong Kong is offering the undergraduate degree programmes in testing and certification. For the teaching and research purpose, an acoustic room was built to support the areas of sound pressure level measurement in the Open University of Hong Kong. The acoustic room was primarily designed to serve the sound pressure level measurement of the consumer products, including toys and children’s products and gain the Hong Kong Laboratory Accreditation Scheme (HOKLAS) with reference to ISO/IEC 17025. This paper describes the flow of design, consideration of design factors, verification method, applications and limitations of acoustic chamber.
Design and Verification of Acoustic Room for Consumer Product Safety Testing, Engineering and Applied Sciences.
Vol. 5, No. 3,
2020, pp. 50-55.
Mills, I. M., Taylor, B. N., & Thor, A. J. “Definitions of the units radian, neper, bel and decibel. Metrologia”, 38 (4),, 2001, pp. 353.
Axelsson, Alf. "The risk of sensorineural hearing loss from noisy toys and recreational activities in children and teenagers." International Journal for Consumer and Product Safety 3.3 (1996): 137-146.
Brookhouser, Patrick E., Don W. Worthington, and William J. Kelly. "Noise‐induced hearing loss in children." The Laryngoscope 102.6 (1992): 645-655
Daniel, Eileen. "Noise and hearing loss: a review." Journal of School Health 77.5 (2007): 225-231.
Levey, Sandra, et al. "The Effects of Noise-Induced Hearing Loss on Children and Young Adults." Contemporary Issues in Communication Science & Disorders 39 (2012).
Peng, Jian-Hua, Ze-Zhang Tao, and Zhi-Wu Huang. "Risk of damage to hearing from personal listening devices in young adults." Journal of Otolaryngology 36.3 (2007).
Sliwinska-Kowalska, Mariola, and Adrian Davis. "Noise-induced hearing loss." Noise and Health 14.61 (2012): 274.
WHO, World Health Organization. “Make listening safe”. 2015.
Harrison, Robert V. "The prevention of noise induced hearing loss in children." International journal of pediatrics 2012 (2012).
Yaremchuk, Kathleen, et al. "Noise level analysis of commercially available toys." International journal of pediatric otorhinolaryngology 41.2 (1997): 187-197.
EC2009, 2009/48/EC “European Comission Toys Safety Directive”
EN71, EN71-1: 2014 “Safety of toys - Part 1: Mechanical and physical properties”.
FHSA, Federal Hazard Safety Act, 16 CFR 1500.47 “Method for determining the sound pressure level produced by toy caps”.
Buelow, Robert J. The Design Considerations of an Anechoic Chamber. No. 1999-01-1832. SAE Technical Paper, 1999.
Ressl, Marc, and Pablo E. Wundes. "Design of an acoustic anechoic chamber for application in hearing aid research." Proceedings of the 11 th WSEAS International Conference on Acoustics & Music: Theory & Applications ATMA. 2010.
Rusz, Roman. "Design of a fully anechoic chamber." (2015).
Nielsen, MB Schøyen. "Anechoic vs. Semi Anechoic Rooms."
ISO 7779, EN ISO 7779: 2010 “Acoustics. Measurement of airborne noise emitted by information technology and telecommunications equipment”.
Fahy, Frank J., and Vincent Salmon. "Sound intensity." (1990): 2044-2045.
Pavic, G. "Measurement of sound intensity." Journal of Sound Vibration 51 (1977): 533-545.
Royster, H., et al. "Sound measurement: Instrumentation and noise descriptors." The noise manual 5.41-98 (2003).
ISO 3744, EN ISO 3744: 2010 “Acoustics -- Determination of sound power levels and sound energy levels of noise sources using sound pressure -- Engineering methods for an essentially free field over a reflecting plane”.
Rozli, Z., & Zulkarnain, Z. “Noise control using coconut coir fiber sound absorber with porous layer backing and perforated panel”. American Journal of Applied Sciences, 7 (2), 2010, pp. 260-264.
Borelli, D., and C. Schenone. "Effect of perforated facing on sound absorption of polyester fibre material." Applied Acoustics 66 (2005): 1383-1398.
Flimel, M. (2014). Vibro-Acoustic Comfort Assessment Methodology of Residential Buildings in Urban Environment. In Advanced Materials Research (Vol. 1041, pp. 428-431). Trans Tech Publications.
Flimel, M., & Dupláková, D. (2017). Acoustical comfort in building interior during musical production in town residential area of locality. Noise & Vibration Worldwide, 48 (11), 154-158.
Flimel, M., & Dupláková, D. (2016). Vibro-acoustical certification management of residential houses. Saarbrücken: LAP Lambert Academic Publishing, 103 p. ISBN 978-3-659-93619-7.
Jacobsen, Finn, and Hans-Elias de Bree. "A comparison of two different sound intensity measurement principles." The Journal of the Acoustical Society of America 118.3 (2005): 1510-1517.