Browse > Article
http://dx.doi.org/10.9797/TSISS.2012.8.2.072

A Study on the Noise Reduction through the Control of Internal Flow for a Slim Type External ODD  

Lee, Woo-Jin (Department of Mechanical Engineering, Yonsei Univ.)
Seo, Jun-Ho (Department of Mechanical Engineering, Yonsei Univ.)
Rhim, Yoon-Chul (Department of Mechanical Engineering, Yonsei Univ.)
Publication Information
Transactions of the Society of Information Storage Systems / v.8, no.2, 2012 , pp. 72-77 More about this Journal
Abstract
The demand for the laptop computer has been increased day by day and most of users ask quiet computer and devices to work in comfortable environment. One of the devices which generate acoustic noise is an external ODD. Unlike the internal ODD, the external ODD is easy to emit noise because it runs outside of the computer and also it is packed with a thin plastic covers. As the disk rotates, vortex flow is generated inside of the cavity due to various and complicated mold parts of the cover. In addition, there is a gap between the disk tray and the upper/lower cases, through which the air flows as well as the noise leaks. In this study, we have proposed how to reduce the acoustic noise of an external ODD using numerical and experimental analysis. The pressure fluctuations and turbulent kinetic energy distributions are calculated for the developed model. The results show that the sound pressure level is reduced by 2.3dB through simple modifications of ribs of the top cover, which remove or suppress flow instabilities inside of the cavity.
Keywords
external ODD; sound-pressure-level(SPL); noise reduction; flow field analysis;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Tae-Man Yang, 2008, "A study for reduction of Aerodynamic Noise of a High-Speed Slim-Type Optical Disk Drive", Dept. of Mechanical Engineering The Graduate School Yonsei University
2 Seung-Hyun Han, 2009, "Noise Level Reduction of a Slim-type ODD using the Idea of a Helmholtz Resonator", Dept. of Mechanical Engineering The Graduate School Yonsei University
3 W. De Roeck,W. Desmet, M. Baelmans, P. Sas, 2004, "On the prediction of near-field cavity flow noise using different CAA techniques", K.U.Leuven, Department of Mechanical Engineering Celestijnenlaan 300 B, B-3001, Leuven, Belgium
4 Byeong G.. Moon, Sung W. Cha, Byoung H. Lee, 2005, "The Study on ODD Acoustic Noise Reduction by Using Micro Muffler", The Society of Information Storage Systems'06, Vol.2(1), p50
5 Dong-Hyun Kim, Se-Won Oh, Yu-Sung Kim, 2005, "A Study on the Characteristic of Driving Sound Noise for Various Optical Disk Drives", Transactions of the Korean Society for Noise and Vibration Engineering, 2005, Vol.15(10), pp.1169-1176   과학기술학회마을   DOI   ScienceOn