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http://dx.doi.org/10.7776/ASK.2014.33.2.111

An Experimental Analysis of the Structure-Borne Noise Reduction on Electrical Equipment  

Lee, Seong-Hyun (한국기계연구원 시스템다이나믹스연구실)
Seo, Yun-Ho (한국기계연구원 시스템다이나믹스연구실)
Kim, Won-Hyoung (삼성탈레스)
Choi, Young-Cheol (국방과학연구소)
Publication Information
The Journal of the Acoustical Society of Korea / v.33, no.2, 2014 , pp. 111-117 More about this Journal
Abstract
In this paper, the structure-borne noise reduction on electrical equipment is discussed by the experimental analysis. The water cooling system in electrical equipment is the only noise source, so the mock-up was made to measure noise characteristics. Effects of power supply, stiffness, isolation of noise source and natural frequency determined by resilient mounts are investigated using the mock-up. The console prototype was made referring to noise reduction technique by the mock-up. The structure-borne noise level of a console prototype was measured and some experiments to reduce the noise was undertaken. The $1^{st}$ and $4^{th}$ harmonics of operating frequency of cooling fans causes highest structure-borne noise levels. The control of operating speeds of several DC cooling fan groups was tried. Also types and installation layouts of resilient mounts were investigated. To reduce structure-borne noise, followings can be applied: increase of stiffness, isolation of source, decrease of natural frequency of mount, combination of operating speed of fans, selection of mounts, and so on.
Keywords
Electrical equipment; Structure-borne noise; Cooling fan; Noise reduction;
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  • Reference
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