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Young-boo Son(손영부),Seung-mock Lee(이승목),Jong-hun Ha(하종훈),Byeoung-chul Lee(이병철) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
Recently, noise reduction of air-conditioner is one of the important design factors for high quality product. Especially, customer complaints arise due to noise problem of the outdoor unit. After the operation of airconditioner start, noise level of outdoor unit is increased gradually and sometimes abnormal noise occurs until it reaches steady state condition. The aim of this paper is to investigate the relation between noise of outdoor unit and thermodynamic properties of cycle at transient condition of room air-conditioner. In order to find out the noise characteristics of outdoor unit, noise and vibration measurements are carried out. Also, the thermodynamic properties of compressor and heat exchanger are measured by using temperature and pressure sensors and experimental results are discussed. Finally, we find out the relation between noise and cycle properties at starting of room air-conditioner and the improvement method to reduce noise level is proposed.
손영부(Young-boo Son),하종훈(Jong-hun Ha),이장우(Jang-woo Lee) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.10
In this paper, it is investigated that noise generation mechanism of a rotary compressor using experimental method. The measurement was carried out for primary parameters which influence noise characteristics. By using STFT(short time fourier transform), noise sources of a rotary compressor were identified and vibrating modes that increase the noise are verified. Also, it was studied that the correlation between operating speed and noise. Main factors that affect the variation of noise level were considered by the comparison of the experimental results. In addition, a dynamic characteristic of crank shaft was studied and the critical speed was analyzed.
손영부(Young-boo Son),하종훈(Jong-hun Ha),이장우(Jang-woo Lee) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.11
This paper investigated the noise generation mechanism of a rotary compressor using experimental method. The measurement was carried out for primary parameters which influence noise characteristics. By using STFT(short time Fourier transform), noise sources of a rotary compressor were identified and vibrating modes that increase the noise are verified. Also, it was studied that the correlation between operating speed and noise. Main factors that affect the variation of noise level were considered by the comparison of the experimental results. In addition, a dynamic characteristic of crank shaft was studied and the critical speed was analyzed.
손영부(Young-boo Son),하종훈(Jong-hun Ha),이장우(Jang-woo Lee) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.3
The noise generation mechanism of a twin rotary compressor is investigated. The measurement was carried out for primary parameters which influence noise characteristics. By using signal processing and finite element method, noise sources of a rotary compressor were identified and high frequency vibrating modes that increase the noise level are verified. Also, the correlation between operating speed and noise increment was studied. According to the investigation, structural design of the twin rotary compressor is modified in order to reduce the noise level. In result, the noise level of the twin rotary compressor is reduced by 1.5 dBA.