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Seungchul Shin,Donghoon Shin,Youngwoo Lee,Chung Choo Chung 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In this paper, we propose sliding mode control (SMC) based on singular perturbation theory (SPT) for position tracking of permanentmagnet stepper motors (PMSMs). Separate time scale is a characteristic of the singular perturbation method. Therefore, singular perturbation theory can be applied to the position tracking control of PMSMs because the dynamics of PMSMs is separated into slow and fast dynamics. The proposed method consists of torque modulation, commutation scheme, and SMC. Torque modulation was developed to generate the desire currents. For position control, the SMC was proposed only position feedbackwithout any other observer. The simulation results validate the performance of the proposed method.
Seungchul Shin,Dongmin Lee,Eunji Keum 대한교통학회 2022 대한교통학회 학술대회지 Vol.87 No.-
Micro-electric vehicles (MEVs) have been considered as a solution to the limits of conventional vehicles due to their strengths of the compact body and low running costs. Since the introduction of this future-era transport mode in 2017 in Korea, most studies mainly investigated its driving approval in motorways and safety standards including braking performance. In this case study, for surmising MEV’s potential use in urban areas, we made a concept, the roles of MEVs, from empirical data. We analyzed MEVs’ trajectory data from Jeonnam e-Mobility Regulation Free Special Zone (RFSZ) project, and described the statistics of the key performance measures, such as trip distance, trip duration, and trip speed, by their trip type. It was found that, although those measures may differ in their operational missions, the common purpose for recurring use was captured as its role of shortrange travel mode. Furthermore, this methodology used in this study might be transferred to other empirical studies when a new transportation mode is introduced in the future.
2축 김발 시스템의 시선안정화 성능 향상을 위한 외란관측기를 갖는 슬라이딩 모드 제어기 설계
신승철(SeungChul Shin),박재영(Jae-Young Park),안정훈(Jung-hun Ahn) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
표적을 추적 및 탐지하는 것은 외란에 의한 플랫폼의 움직임 변화의 영향을 받는다. 본 논문에서는 2축 김발 시스템의 시선안정화 성능 향상을 위하여 외란관측기를 갖는 슬라이딩 모드 제어기를 제안 한다. 제안된 제어기 설계를 통하여 김발 시스템의 정밀 위치제어 성능을 시뮬레이션을 통해 확인한다.
자동차 강판의 다겹 점용접에서 QSTS시험에 의한 피로수명
신승철(Seungchul Shin),양성모(Sungmo Yang),유효선(Hyosun Yu),강희용(Heeyong Kang),김채원(Chaewon Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper shows how the number of lap of spot welded joints in automotive steel sheets changes the life-cycle transform of itself. There is a significant development in life of the automotive steel sheets, as well as the safety of the passengers. We verified the validity of S-N curve on materaials by QSTS test. Moreover, we used EZNCEN and HS40R, which are populary used as automotive steel sheets because of their excellence in increasing fuel efficiency. The purpose of this was to compare the fatigue life of two lap of spot welded joints to there. In addition to this, we used the two different kinds of sheets together in the same welding under same condition. Through this whole process, the hypothesis of lethargy coefficients life cycle was congruent to the result of the experiment. That is, when using sheets with the same materials in one welding, the fatigue life of two lap of spot welded joint much superior by EZNCEN 5~14%, HS40R 17~30%,and when using each sheets with different materials, we could discover the decrease in the fatigue life with 6~16%. Finally, choosing the best value from the data based on the experiment led to the analysis of the fatigue life of each layer.
밀리미터파 탐색기 2축 직구동 김발 서보 시스템의 직접 및 간접 시선안정화 성능 분석
신승철(Seungchul Shin),이성용(Sung-Yong Lee) 대한전기학회 2018 전기학회논문지 Vol.67 No.11
Tracking and detecting targets by the millimeter wave seeker is affected by movement of platform. Stabilization equipments use an inertial sensor to compensate for disturbance of stabilizing gimbal or platform. In the direct line of sight stabilization system, an inertial sensor is mounted on inner gimbal to compensate the disturbance directly, so the performance is excellent and the implementation method is simple. However gimbal design requires somewhat larger volume. Since an inertial sensor is mounted on gimbal base in the indirect line of sight stabilization system, additional space of gimbal is not required for the gimbal design. However, this method does not directly compensate for the disturbance of the line of sight stabilization axis, which can degrade performance. In order to perform the tracking performance, two methods are analyzed for line of sight stabilization performance based on direct and indirect of a 2-axis gimbaled servo system for millimeter wave seeker in this study. The simulation and experimental results validate the performance comparison of two methods.