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실험적 방법을 이용한 디지털 카메라 경통 줌 모듈의 소음원 규명 및 저소음화
곽형택(Kwak, Hyung-Taek),정재은(Jeong, Jae-Eun),정운창(Jeong, Un-Chang),이유엽(Lee, You-Yub),오재응(Oh, Jae-Eung) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.11
Noise of digital camera has been noticeable to its users. Particularly, noise of a barrel assembly module in zoom in/zoom out operation is recorded while taking a video. Reduction of barrel noise becomes crucial but there are not many studies on noise of digital camera due to its short history of use. In this study, experiment-based analyses are implemented to identify sources of noise and vibration because of complexity and compactness of the barrel system. Output noise is acquired in various operation conditions using synchronization for spectral analysis. Noise sources of a barrel assembly in zoom operating are first identified by the comparison with gear frequency analysis and then correlation analysis between noise and vibration is applied to confirm the generation path of noise. Analysis on noise transfer characteristic of zoom module is also carried out in order to identify the most contributing components. One of possible countermeasures of noise in zoom operating is investigated by an experimental approach.
다차원 스펙트럼 해석법을 이용한 PDP TV의 저소음화
양인형(Yang, In-Hyung),정재은(Jeong, Jae-Eun),곽형택(Kwak, Hyung-Taek),오재응(Oh, Jae-Eung) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.1
The method is introduced for estimating the noise source contribution on the noise of PDP TV in a multiple-input system where the input sources may be coherent with each other. By the coherence function method, it is found that the biggest part of the noise source in the PDP TV noise is generated by the PCB boards which consume high power and produce high heat. This analysis is modeled as three-input/single-output system because the noise is generated by three main boards, X-board, Y-board, SMPS that are located close to each other. The coherence function method is proved to be useful tool for identifying of noise source. In this study, Transfer Path Analysis using MDSA is implemented to determine the quantitative noise contribution of each board for PDP TV with the rear case closed and with the rear case open. And the possibility of noise reduction is confirmed through the experimental method that isolates the most contributing board by adding sound-absorbing materials to it.