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이해철(H.C.Lee),이민호(M.H.Lee),이준서(J.S.Lee),한경(K.Han),양진승(J.S.Yang),차경옥(K.O.Cha) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
In automobile exhaust system, internal pulsating pressure and shell vibration greatly affect the exhaust noise and the surface radiated noise. This noise is emitted from the tailpipe outlet and the muffler outer wall due to the pulsation of the exhaust gas pressure. This paper describes an analytical study of these characteristics as influenced by exhaust system structure. An exhaust system simulator was used for generating the pressure pulsation. The relationship between pulsating pressure and exhaust noise was analyzed. The relationship between shell vibration and surface radiated noise was also identified by finding FRF.<br/>
[진동·소음부문] 회전요소 베어링 상황감시를 위한 음향-진동 신호의 고차 통계해석
이해철(H.C.Lee),이준서(J.S.Lee),차경옥(K.O.Cha) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper present a study on the application of sound pressure and vibration signals to detect the presence of defects in a rolling element bearing using a statistical analysis method. The well established statistical parameters such as the crest factor and the distribution of moments including kurtosis and skewless are utilized in this study. In addition. other statistical parameters derived from the beta distribution function are also used. A comparison study on the performance of the different types of parameter used is also performed. The statistical analysis is used because of its simplicity and quick computation. Under ideal conditions. the statistical method can be used to identify the different types of defect present in the bearing. In addition. the results also reveal that there is no significant advantages in using the beta function parameters when compared to using kurtosis and the crest factor for detecting and identifying defects in rolling element bearings from both sound and vibration signals.
이해철(H.C. Lee),이준서(J.S.Lee),차경옥(K.O.Cha) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
Setting the channel-switching phase of automobile control mufflers in low-speed region is effective measures to improve low-speed torque. A muffler sensing exhaust-gas pressure has been developed to solve this problem. This muffler reduces exhaust noise in a pair of tailpipes by generating interference through a reverse-phasing process. This reduces exhaust noise makes it possible to set the muffler's channel-switching phase in the low-speed region.<br/>
Vacuum Gauge Calibration System in Pohang Accelerator Laboratory
김형종(H. J. Kim),조복래(B. L. Cho),이해철(H. C. Lee),박종도(C. D. Park),최우천(W. C. Choi) 한국진공학회(ASCT) 1994 Applied Science and Convergence Technology Vol.3 No.4
포항가속기연구소에서 사용될 진공게이지 교정시스템이 설계 제작되었다. 이 교정시스템은 동적 교정 방법으로 설계 되었으며, transfer standard 로서 spinning rotor gauge를 사용하였다. 포항가속기의 저장링에 사용될 모든 진공게이지는 이 교정시스템으로 교정을 하여 사용할 것이며, 주로 교정할 게이지로는 Bayard-Alpert (BA) nude ionization gauge와 cold cathode gauge 등이 있다. 본 논문에서는 포항가속기의 진공게이지 교정시스템에 대해서 소개를 하였고, 현재까지 BA nude ionization gauge 6대, extractor gauge 1대, high pressure gauge 1대와 cold cathode gauge 5대를 10^(-4) 에서 10^(-4) Torr 범위내에서 교정하여 그 결과를 보였다. The vacuum gauge calibration system has been designed and established in Pohang Accelerator Laboratory (PAL). This system is characterized by a dynamic expansion method with a spinning rotor gauge as a transfer standard. This calibration system is used extensively for calibrating Bayard-Alpert (BA) nude ionization gauges as well as cold cathode gauges used in the storage ring vacuum system of Pohang Light Source (PLS). The pressure range for the calibration is between 10^(-4) and 10^(-9) Torr. This study covers design details and some of calibration results for several types of gauges: six BA nude ionization gauges, one extractor gauge, one high pressure gauge, and five cold cathode gauges.