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서문석(Mun-suk Suh),박동창(Dong-Chang Park),최진환(JinWhan Choi),이승종(Seungjong Yi),허건수(Kunsoo Huh),윤덕진(Dukjean yun),신장호(Janghoo Shin) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
The mobility of tracked vehicles is mainly influenced by the interaction between tracks and soil, so that the characteristics of their interactions are quite important for the tracked vehicle study. In particular, the track tension is closely related to the maneuverability of tracked vehicles and the durability of tracks and suspension systems. In order to minimize the excessive load on the tracks and to prevent the peaI-off of tracks from the road-wheels, the Dynamic Track Tensioning System (DTTS) which maintains the optimum track tension throughout the maneuver is required. Because it is very difficult to measure the track tension in real-time, the track tension needs to be estimated for realizing the DTTS system. In this paper, track tension estimation methods are validated experimentally with real tracked vehicles. The tracked vehicles are instrumented with severaI sensors including gyro, accelerometer, LVDT, etc. The DSP processor board is programmed with the estimation algorithm and calculates the tension in real-time based on the measured output. The estimated tension is compared with the real tension that is measured by specially prepared DTIS sensors.<br/> <br/>
서문석 ( Moon Suhk Suh ),이철승 ( Churl Seung Lee ),이경일 ( Kyoung Il Lee ),신진국 ( Jin Koog Shin ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
To illustrate an application of the field effect transistor (FET) structure, this study suggests a new cantilever, using atomic force microscopy (AFM), for sensing surface potentials in nanoscale. A combination of the microelectromechanical system technique for surface and bulk and the complementary metal oxide semiconductor process has been employed to fabricate the cantilever with a silicon-on-insulator (SOl) wafer. After the implantation of a high-ion dose, thermal annealing was used to control the channel length between the source and the drain. The basic principle of this cantilever is similar to the FET without a gate electrode.
전기 유동유체를 함유하는 지능외팔보의 진동특성 및 제어 실험적 고찰
최승복,박용군,서문석,Choi, Seung-Bok,Park, Yong-Kun,Suh, Moon-Suk 대한기계학회 1993 대한기계학회논문집 Vol.17 No.7
This paper reports on a proof-of-concept experimental investigation focused on evaluating the vibration characteristics and control of smart hollow cantilever beams filled with an electro-rheological(ER) fluid. The beams are considered to be of uniform viscoelastic materials and modelled as a viscously-damped harmonic oscillator. Electric field-dependent natural frequencies, loss factors and complex moduli are evaluated and compared among three different beams : two types of different volume fraction of ER fluid and one type of different particle concentration of ER fluid by weight. Modal characteristics of the beams are observed in both the absence and the presence of electric potentials. It is also shown that by constructing active control algorithm the removal of structural resonances and the suppression of tip deflection are obtained. This result provides the feasiblility of ER fluids as an active vibration control element.
허건수(Kunsoo Huh),서문석(Munsuk Suh),김재용(Jaeyong Kim),정순규(Soonkyu Jeong),정정주(Chungchoo Chung),김일민(Ilmin Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Maintaining track tension in tracked vehicles minimizes the excessive load on the tracks and prevents the<br/> peal-off of tracks from the road-wheel, and adequately guarantees the stable and improved driving of the<br/> tracked vehicles. However, the track tension cannot be easily measured due to the limitation in the sensor<br/> technology, harsh environment, etc. In this study, the track tension is estimated in real-time from the<br/> measurable signals of tracked vehicles and controlled based on a fuzzy logic controller. The proposed control<br/> system is implemented on tracked vehicles and its performance is evaluated under various driving conditions.
센서 잡음이 존재하는 경우의 궤도 차량에 대한 예견 제어
유성필(Seongpil Ryu),박영진(Youngjin Park),박윤식(Younsik Park),서문석(Moonsuk Suh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a reference model tracking preview controller is designed for nonlinear tracked vehicle systems. The reference model to be tracked consists of observer-based preview controller and linear tracked vehicle model. The observer based preview controller is an optimal controller at noisy environment such as system and sensor noises. The linear tracked vehicle model is modified to use a rate of vertical road elevation as preview information. Commercial program model is used to verify the control algorithm. The performance of the preview control system is evaluated on the ride quality which is estimated from the acceleration of the driver's position.