Abstract
The noise and vibration of a rotary compressor, a type of multi-input, single output system, are generally studied through frequency analysis. Although this method is effective in analyzing frequency components, using this method to identify the specific source of the noise (4 kHz to 6 kHz) is difficult. Hence, noise source should be studied systematically. In this study, a coherence analysis method based on systems analysis is used to identify the compressor noise source. Compressor noise source is identified through the coherence between the vibration signals on the shell of the compressor and the noise signal at one point near the compressor (1 m away from the compressor). A one-third octave band is employed for frequency analysis. The design of experiment is conducted to identify possible noise factors, such as volume, size, and neck area of the resonator in the compressor cylinder. Analysis showed that noise was generated from the cavity of the cylinder and the muffler inside the rotary compressor. A new type of muffler was applied to the rotary compressor to verify this finding. Noise was dramatically reduced.
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HeuiCheol Kim received his B.S. degree in Mechanical Design Engineering from Pusan National University, Korea in 1991. He then received his M.S. from Pusan National University in 1994. Kim is currently taking his doctorate degree at the School of Mechanical Engineering at Yeungnam University in Gyeongsan, Korea. His research interests include signal processing technology.
Migyung Cho received her B.S. degree and Ph.D from the Department of Computer Science, Pusan National University, Pusan, Korea in 1994 and 1998, respectively. She has been an associate professor at Tongmyong University in Pusan since September 2002. Her research interests include design and analysis of computer algorithms, pattern recognition, and computer simulation of nano-bio.
Jaesool Shim received his B.S. in Mechanical Engineering degree from Pusan National University, Korea in 1995. He then received his M.S. from Pohang University of Science and Technology and Ph.D from WSU in 1997 and 2007, respectively. Dr. Shim is currently a professor at the School of Mechanical Engineering at Yeungnam University in Gyeongsan, Korea. His research interests include lab-on-a chip and bio/nano technology.
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Kim, H.C., Cho, M.G., Kim, J. et al. Coherence technique for noise reduction in rotary compressor. J Mech Sci Technol 26, 2073–2076 (2012). https://doi.org/10.1007/s12206-012-0517-1
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DOI: https://doi.org/10.1007/s12206-012-0517-1