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연속 가변 댐퍼에 의한 반능동 현가장치의 고 자유도 제어기
최주용(Ju Yong Choi) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.11
This paper proposes CDC (Continuous Damping Control) algorithm and verifies in multi-body dynamic vehicle. In order to distinguish a road profile on driving, waviness calculated by the filtered vertical-accelerations of sprung and unsprung masses is introduced. Sky-hook control is used at a low waviness road and constant damping level control is used at a high waviness road, where the hard damping level is determined by waviness, roll rate, acceleration, and deceleration. The damping levels of ride, anti-roll, anti-squat, and anti-dive modules are calculated by tuning parameters which is dependent upon vehicle velocity. Therefore this high tunable algorithm is useful to improve the ride and handling performance under various driving conditions. In the simulations, tire and dampers are modelled by SWIFT (Short Wavelength Intermediate Frequency Tire) model and 1st order delay model, and results are compared with conventional damper"s.
김수용(Su Yong Kim),최주용(Ju Yong Choi),이만형(Man Hyung Lee) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.10
In this paper, a new indoor positioning system based on incident angle measurement of infrared sensor has been suggested. Though there have been various researches on indoor positioning systems using vision sensor or ultrasonic sensor, they have not only advantages, but also disadvantages. In a new positioning system, there are three infrared emitters on fixed known positions. An incident angle sensor measures the angle differences between each two emitters. Mathematical problems to determine the position with angle differences and position information of emitters has been solved. Simulations and experiments have been implemented to show the performance of this new positioning system. The results of simulation were good. Since there existed problems of noise and signal conditioning, the experimented has been implemented in limited area. But the results were acceptable. This new positioning method can be applied to any indoor systems that need absolute position information.
폐쇄형 배전반의 부스바 냉각을 위한 팬 위치 최적화 연구
김홍민(Hong Min Kim),최주용(Ju Yong Choi) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.1
배전반은 전기를 수전해 수용가에 알맞은 전기로 변환하여 각종 전기 설비에 배전하는 장치이다. 부스바는 배전반 동작 시 발열로 인한 내부 온도상승으로 내부 장비 성능과 수명에 영향을 미친다. 폐쇄형 배전반의 경우 방열이 제대로 이루어지지 않아 기존 설계용량보다 크게 제작되어야 하므로 제작비가 비싸다는 단점이 있다. 본 연구에서는 1,600A급 폐쇄형 저압 배전반의 내기순환조건에 따른 부스바 냉각특성해석 및 실험을 통해 팬 위치 최적화 설계를 수행하였다. 최적화된 팬 위치에서 부스바 냉각효과를 최대화할 수 있었다. The switchboard is a device that receives electricity, converts it into electricity suitable for the consumer, and distributes it to various electric facilities. The busbar affects internal equipment performance and service life owing to the internal temperature rise caused by heat generation during operation of the switchboard. In the case of an enclosed switchboard, the heat is not dissipated properly, and the manufacturing cost is high because it the design capacity must be larger than the existing design capacity. In this study, the fan position was optimized by analyzing the cooling characteristics of the busbar, and conducting experiments thereof, according to the internal air circulation condition of the 1,600A class enclosed low voltage switchboard. It was possible to maximize the cooling effect of the busbar at the optimized fan position.
윤현철(Hyun-cheol Yoon),최주용(Ju Yong Choi) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.11
Oil seals have a great effect on transmission performance and durability. In this study, the optimal rubber mix was derived using dispersion analysis to obtain excellent oil-seal rubber properties. ANOVA was performed twice. The factors were polymers, carbon, magnesium oxide, and calcium hydroxide, which were used as four factors in ANOVA. The response factors were four items (hardness, tensile strength, elongation rate, and compression deformation) obtained through an experiment with a confidence level of 95%. In the first ANOVA, 168 tests were performed, and in the secondary ANOVA, 24 physical tests were conducted using polymers and carbon derived from the primary ANOVA. Through the ANOVA, we derived a rubber mixture recipe.
Multi-beam형 LIDAR 센서의 가상주행환경 기반 전방물체 인식에 관한 연구
윤현철(Hyun-cheol Yoon),최주용(Ju Yong Choi) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
For a multi-beam type LIDAR(Light Detection and Ranging) sensor, obstacle detection algorithm is presented. The distance from a following vehicle equipped LIDAR to a leading vehicle is calculated by TOF(time of flight) in general. When a car or a motorcycle cut-in front of the following vehicle, the type of vehicle (car or motorcycle) is distinguished by comparing the distances by side and center beam. To verify the proposed algorithm, following and leading vehicles, LIDAR sensor, and driving scenario are virtually designed in TNO PreScan.
김창수(Chang Su Kim),최주용(Ju Yong Choi) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
In this paper, structural analysis of the frame of the four-wheel electric scooter was performed. Analysis is made up of bending and torsional stiffness and structural and vibration analysis of load. The modeled using CATIA, frame was analyzed using ANSYS. After being fixed portion associated with the rear wheel, analysis by bending and trsion loads were analyzed by applying force to the part that is connected to the front wheel. Analysis by load that consider weight of people and battery was performed. Natural frequency was derived using vibration analysis. Were compared with the frequency of the motor by using a gear ratio and natural frequency.