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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.
벡터합성법을 이용한 차량 실내소음의 입력원 영향도 평가
양인형(Yang, In-Hyung),정재은(Jeong, Jae-Eun),오재응(Oh, Jae-Eung) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.6
A passenger vehicle has various and complicated transmission paths of sound and vibration. In order to identify the mechanism of transfer path, estimation of excitation force and exact modeling of transfer path are required. In this paper vector synthesis technique is employed to identify the characteristics of road noise and its transmission to vehicle compartment through noise and vibration analysis. Vibration reduction efficiency of each transfer path is evaluated by comparing individual vector components obtained virtual simulation. The degree of effect is used to estimate the contribution of vibration input components to total output. And in this paper presents a new technique based on simulation studies using vector synthesis diagram and design of experiments, by which the effects of magnitude and phase change of input paths can be predicted.
주행 차량의 로드 노이즈 예측을 위한 각 입력원의 기여도 평가
양인형(Yang, In-Hyung),정재은(Jeong, Jae-Eun),윤지현(Yoon, Ji-Hyun),오재응(Oh, Jae-Eung) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.11
The reduction of the vehicle interior noise has been the main interest of noise and vibration harshness(NVH) engineers. A passenger vehicle has various and complicated transmission paths of sound and vibration. In order to identify the mechanism of transfer path, estimation of excitation force and exact modeling of transfer path are required. This paper presents method for estimating the noise source contribution on the road noise of the vehicle in a multiple input system where the input sources may be coherent with each other. And vector synthesis technique is employed to identify the characteristics of road noise and its transmission to vehicle compartment through noise and vibration analysis. Vibration reduction efficiency of each transfer path is evaluated by comparing individual vector components obtained virtual simulation.
Silicon Matrix MRE 의 인가전류에 따른 전단계수 증가율 측정
윤지현(Ji-Hyun Yoon),정재은(Jae-Eun Jeong),양인형(In-Hyung Yang),이정윤(Jung-Youn Lee),오재응(Jae-Eung Oh) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
MRE(Magneto-rheological Elastomer) is a material which shows reversible and various modulus in magnetic field. Comparing to conventional rubber vibration isolator, MREs are able to absorb broader frequency range of vibration. These characteristic phenomena result from the orientation of magnetic particle (i.e., chain-like formation) in rubber matrix. In this study, Silicon was used as a matrix in order to manufacture MREs. Magnetic reactive powder(MRP), having rapid magnetic reaction, was selected as a magnetic particle to give magnetic field reactive modulus. The mechanical properties of manufactured MREs were measured with the application of magnetic field. The analysis of MR effect was carried out by FFT analyzer with various induced current. As the addition of CIP and induced current intensity increased, increment of MR effect was observed.
소음원의 영향이 고려된 가상 세탁음 제작을 통한 드럼 세탁기의 음질 인덱스 구축
정재은(Jeong, Jae-Eun),양인형(Yang, In-Hyung),누룰 파와지(Fawazi, Noor),정운창(Jeong, Un-Chang),이정윤(Lee, Jung-Youn),오재응(Oh, Jae-Eung) 한국소음진동공학회 2012 한국소음진동공학회 논문집 Vol.22 No.6
The objective of this study is to determine the effect for the sound quality according to the noise source and to build the sound quality index of the laundry noise. In order to compare laundry noise among the influence of noise sources, we made virtual laundry noises by synthesizing an actual laundry noise and each noise source such as a dropping noise, water noise, motor noise and circulation pump noise. We conducted a listening test by customers using virtual laundry noises. As a result of listening test, we found that the dropping noise has a decisive effect on the sound quality of the laundry noise. We conducted the multi regression analysis of sound quality for the laundry noise using the statistical data processing. It is verified to the reliability of the multi regression index by comparison with listening results and index results of other actual laundry noises. This study is expected to provide a guide line for improvement of the laundry noise.