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      • KCI등재

        FxLMS 알고리듬 기법을 이용한 식기 세척기의 펌프 소음 능동 제어

        탁언수,오한음,홍진숙,정의봉 한국음향학회 2021 韓國音響學會誌 Vol.40 No.1

        In this paper, active noise control was performed to reduce radiated noise in the low frequency band of dishwashers. First, through an analysis of the noise environment of the dishwasher, it was confirmed that the pump noise contributed the most to the radiated noise in the low frequency band, From the result of the noise environment analysis, the reference signal was selected to be the vibration signal of the pump body. The reference signal was obtained by using the accelerometer on the pump body, which can prevent acoustic feedback. The error signal sensor was selected as a microphone located at 1 m in front of the dishwasher and 0.5 m in height. And to design the controller, the error signal and the reference signal were measured at the operational rpms of the dishwasher at 2,500 rpm, 2,600 rpm and 2,800 rpm, and the secondary path transfer function was measured. The designed controller was mounted on Digital Signal Processor (DSP) equipment, and the control performance was verified experimentally. As a result of the measurement at the 3 operational rpms, the 7th multiple component of pump operating frequency decreased by 1.93 dB, 4.43 dB, 5.15 dB per rpm, and the 12th multiple component decreased by 6.67 dB, 2.34 dB, 4.28 dB per rpm. And overall Sound Pressure Level (SPL) decreased by 0.84 dB, 2.58 dB, 1.48 dB by rpm. 본 논문에서는 가정용 식기세척기의 저주파 대역 방사 소음 저감을 위하여 능동 소음 제어를 수행하였다. 먼저 식기세척기의 소음 환경 분석을 통해 펌프 소음이 저주파 대역 방사 소음에 가장 크게 기여하고 있음을 확인하였고 이를 고려하여 참조 신호를 선정하였다. 참조 신호는 음향피드백을 방지하기 위해 가속도계를 이용하여 펌프 몸체에 부착하여 획득하였다. 오차 신호 센서는 식기세척기 전방 1 m, 높이 0.5 m에 위치한 마이크로폰으로 선정하였다. 다음으로 제어기 설계를 위해 식기세척기의 작동 회전수 2,500 rpm, 2,600 rpm, 2,800 rpm에 대하여 오차 신호와 참조신호를 측정하고, 2차 경로 전달함수를 측정하였다. 그리고 설계된 제어기를 Digital Signal Processor(DSP) 장비에탑재 시켜 제어 성능을 시험으로 확인하였다. 시험 결과 펌프 작동 주파수의 7차 배수 성분에서는 회전수 별로 1.93 dB, 4.43 dB, 5.15 dB 만큼 줄었고 12차 배수 성분에서는 회전수 별로 6.67 dB, 2.34 dB, 4.28 dB 만큼 줄었다. 그리고overall Sound Pressure Level(SPL)은 회전수별로 0.84 dB, 2.58 dB, 1.48 dB 만큼 줄었다

      • KCI등재

        부분 기여도 함수를 이용한 Heat Pump 건조기의 소음원 기여도 분석

        탁언수,안세진,정의봉,장진만,장철민 한국소음진동공학회 2021 한국소음진동공학회 논문집 Vol.31 No.2

        To effectively reduce noise from heat pump (HP) dryers equipped with various components that are potential noise sources, a contribution analysis of the noise generated by each component is necessary. In this study, the main sources of noise in a HP dryer were assumed to be the compressor, drying fan, drum, lower box fan, and PCB fan. A contribution analysis was performed by evaluating the correlation between the vibration signal for each component and the noise radiated from the HP dryer. The contribution of 31 independent components created by combining the coupled relationships among the five main noise sources was calculated. In addition, a contribution map was created for each component to represent the contribution at each frequency of interest. The use of these contribution maps not only enabled the determination of the noise contribution by each component but also provided an understanding of the coupled relationship among the noise sources at the frequency of interest. These contribution maps are expected to be applicable not only to dryers but also to mechanical systems with multiple noise sources.

      • KCI등재

        냉장고 기계실의 고주파 소음 특성 분석을 통한 음질 개선

        장준영,김태훈,탁언수,정의봉,안세진 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.5

        This paper provides an analysis of the characteristics of the noise of components that affect the sound quality of oil-less refrigerators and suggests ways to effectively improve the sound quality. As the sound quality of refrigerators is determined by the characteristics of the various components and the path through which the noise is transferred, it is necessary to first analyze the characteristics of the noise generated by the components. Therefore, after measuring the noise of each part, we conducted a contribution analysis of the sound quality of each noise source. As a result, the oil-less compressor was found to be the dominant part of the sound quality of the refrigerator, while the high-frequency noise of the compressor is the main cause of poor sound quality. Then, to improve the sound quality by reducing the high-frequency noise of the compressor, we changed the transfer path of the noise using sound-absorbing and -insulating material and predicted the effect of the sound quality through a pressure transmissibility test. As a result of verification from actual operation, the sound quality of the refrigerator was improved most by the reduction of the sharpness and criteria of declination when the absorbent was attached to the surrounding walls of the compressor. Finally, the overall SPL decreased by 2.95dBA, and the sound quality score was improved by 1.83.

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