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다차원 스펙트럼 해석법을 이용한 차실내 운전자석 진동전달경로 규명에 관한 연구
이유엽(Lee, You-Yub),박상길(Park, Sang-Gil),오재응(Oh, Jae-Eung) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.8
In this study, transfer path identification and output estimation are simulated by multi-dimension spectral analysis method (MDSA). Multi -input/single-output system give expression the vehicle suspension which each inputs are correlated reciprocally. In case of correlating with inputs, the system needs separating the each input signal by MDSA. Main simulations are about finding effective input by coherent output spectrum and selecting optimal input's number by multiple coherence function. Also, by shielding transfer path of each input, transfer path characteristic is identified in terms of overall integrated contribution level.
이유엽(Lee, You-Yub),박상길(Park, Sang-Gil),오재응(Oh, Jae-Eung) 한국소음진동공학회 2009 한국소음진동공학회 논문집 Vol.19 No.3
This study presents the active noise control of duct noise. The duct was excited by a steady-state harmonic and white noise force and the control was performed by one control speaker attached to surface of the duct. An adaptive controller based on filtered x LMS(FXLMS) algorithm was used and controller was defined by minimizing the square of the response of the error microphone. The assemble controller, which is called a hybrid ANC(active noise control) system, was combined with feedforward and feedback controller. The feedforward ANC attenuates primary noise that is correlated with the reference signal, while the feedback ANC cancels the narrowband components of the primary noise that are not observed by the reference sensor. Furthermore, in many ANC applications, the periodic components of noise are the most intense and the feedback ANC system has the effect of reducing the spectral peaks of the primary noise, thus easing the burden of the feedforward ANC filter.
전달특성을 이용한 소음원 규명과 입력요소 변경에 의한 실내소음 저감
이유엽(Lee, You-Yub) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.12
The structure has several types of noise and booming noise of a vehicle is usually caused by the vibration of the vehicle's body transmitted from the engine through the mounting system. Vector synthesis analysis is performed to predict the booming noise when the characteristic of the engine mounting system is changed., i.e., when magnitudes and phases of vibratory forces after the mounts are altered. To use this method effectively, the concept of Multi-dimensional-analysis and Experimental Design are introduced to identify the contributions of each vibration sources and transmission paths to interior noise. It was used 3inputs/1output system and found the magnitudes and phases of the forces for minimizing the noise. Finally, the synthesized interior booming noise level is predicted by the vector synthesis diagram. It is shown that the vector synthesis method can be used to obtain the optimum design characteristic of the mounting system to control the interior booming noise of a vehicle.
인체 감지형 자기장 코일의 감지거리 13.4mm를 이용한 디지털 잠금장치 설계에 관한 연구
이인상(Lee, In-Sang),송제호(Song, Je-Ho),방준호(Bang, Jun-Ho),이유엽(Lee, You-Yub) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.1
본 논문에서는 인체 감지형 자기장 코일의 감지거리 13.4mm를 이용한 디지털 잠금장치 설계에 관한 연구를 하고자 한다. 현재 사용되는 디지털 잠금장치와는 다르게 실외 케이스는 기존의 고유번호 입력버튼, 조명, 보호 커버, 해당 pcb, 외곽 케이스, 데이터 전송 케이블 등이 삭제되고 구동전원 ON/OFF 스위치와 비상 단자로만 구성하였다. 실내 케이스는 내부에 설치 된 자기장 코일기판이 유리문 몸체에 밀착된 상태로 12mm 간격의 맞은편 실외에서 전송되는 전기적 저항 값을 감지하 면 그에 대응하는 유도전류가 흐르게 된다. 이때, 해당 원형 코일의 주파수 변환이 이루어지면 자기장 코일은 센서의 역할을 수행하게 된다. 센서로서의 자기장 코일은 인체가 감지되기 전과 감지 후에 출력되는 발진 주파수의 크기 변화를 감지하고 2,000%이상 증폭시켜 디지털 신호로 변환 조합한 다음 전용 소프트웨어에 전송하여 내장된 고정 데이터와 비교하여 검색하 는 역할을 한다. 연구결과 자기장 코일 12.8Ø 기준으로 인체의 터치 면적에 따른 감지시간은 30% 대비 0.08sec, 80% 대비 0.03sec이며 감지거리는 13.4mm로 최고 수준으로 측정되었다. This study evaluated a digital locking device design using detection distance of 13.4mm of a human body sensing type magnetic field coil. In contrast to digital locking devices that are used nowadays, the existing serial number entering buttons, lighting, number cover, corresponding pcb, exterior case, and data delivery cables have been deleted and are only composed of control ON/OFF power switches and emergency terminals. When the magnetic field coil substrates installed inside the inner case detects the electric resistance delivered from the opposite side of the 12mm interval exterior contacting the glass body part, the corresponding induced current flows. At this time, the magnetic field coil takes the role as a sensor when coil frequency of the circular coil is transformed. The magnetic coil as a sensor detects a change in the oscillation frequency output before and after the body is detected. This is then amplified to larger than 2,000%, transformed into digital signals, and delivered to exclusive software to compare and search for embedded data. The detection time followed by the touch area of the body standard to a 12.8Ø magnetic field coil was 30% contrast at 0.08sec and 80% contrast at 0.03sec, in which the detection distance was 13.4mm, showing the best level
이충휘(Choong-Hwi Lee),조용구(Joe Yong-Goo),이유엽(You-Yub Lee),오재응(Jae-Eung Oh),이정윤(Jung Youn Lee) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The method of the reduction of the induction noise can be classified by the method of passive control and the method of active control However, the passive control method has a demerit to reduce the effect of noise reduction at low frequency (below 500Hz) range and to be limited by a space of the engine room. Whereas, the active control method can overcome the demerit of passive control method, The algorithm of active control is mostly used the LMS (Least-Mean-Square) algorithm because the LMS algorithm can easily obtain the complex transfer function in real-time. Especially, Filtered-X LMS (FXLMS) algorithm is applied to an ANC system However, the convergence performance of LMS algorithm goes bad when the FXLMS algorithm is applied to an active control of the induction noise under rapidly accelerated driving conditions. So, this study demonstrates the modified FXLMS algorithm and improves the control performance to reduce the automotive induction noise under the rapidly accelerated driving conditions.
최적의 U-헬스케어용 원격진료서비스 시스템에 대한 전자파적합성 분석
정의붕(Jeoung, Eui-Bung),이유엽(Lee, You-Yub),송제호(Song, Je-Ho) 한국산학기술학회 2012 한국산학기술학회논문지 Vol.13 No.11
본 논문에서는 만성질환자 및 의료취약계층을 대상으로 지속적이고 체계적으로 건강상태를 체크하고 가장 최적의 환경을 지원하여 삶의 질을 향상시킬 수 있는 u-헬스케어용 원격진료서비스 시스템에 대한 것이다. u-헬스케 어용 원격진료서비스 시스템은 무선을 통해 흉부에서 들리는 생체음을 측정하는데 이때 시스템에 사용하는 무선주파 수에 대해 전자파의 적합성을 확인하고 의사와 환자에게 발생되는 전자파의 해에 대한 실험을 통해 u-헬스케어용 원 격진료서비스 시스템이 진단시 의사와 환자 인체에 무해하다는 진단 환경을 제시한다. A u-healthcare remote diagnosis system is proposed for chronic disease and medical vulnerable groups check the health systematically and support for the most optimal environment to improve the quality of life. The u-healthcare remote diagnosis system using wireless measure the thoracic sound in the chest. And this is demonstrated that the system using radio frequency is not be affected by the electromagnetic wave with the use of an experiment and by confirming that this u-healthcare remote diagnosis system can not affect the doctors and the patients.