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공동주택 온수난방 시스템의 적정 열공급을 위한 배관망 시뮬레이션
김주용,민만기,최영돈,Kim, J.Y.,Mim, M.K.,Choi, Y.D. 대한설비공학회 1993 설비공학 논문집 Vol.5 No.3
Pipe network of hot water heat supply system in an apartment house was analyzed. Flowrate and supply heat capacity of each household in which constant flowrate balancing valve is installed in a single zone system were calculated and the results were investigated. In the existing piping system, the non-uniformity of heat supply with floors due to the static pressure and temperature difference between supply main and return main can not be avoided and this tendency get intense with the increase of the height of building. The non-uniformity of heat supply can be prevented by the installation of balancing valve at each household, however if the performance of supply pump is not sufficient to overcome the energy loss due to the installation of balancing valve for constant flow rate or if the selection of the valve capacity is not adequate, the valves will may lose their controllability.
차량 능동 현가시시스템의 최적 가변구조제어에 관한 연구
김주용(J.Y.Kim),장효환(H.W.Chang) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The Performance of a Vehicle active suspension system ysing an optimal variabke structure control theory is investihated. The full car model has a 7 DOF which accounts for heave, pitch, roll motions of a sprung mass and vertical motions of 4 unsprung masses. The transient responses are analyzed when a vehicle passing through a bump with a constant speed and the frequency responses are analyzed for heave, pitch, roll, warp inputs at four wheels ln RMS domain. the two types of correlations are considered to compute the mean square responses of a vehicle to random road disturbance. l.e., the comelation between the left and right tracks. and the time delay between the front and rear wheels. A modified first-order shaping filter suggested by Rill ls used to account for the comelation between the left and right tracts. lt is shown that the optimal variable structure controller gives better performance of the vehicle active suspension system than an optimal controller.
김주용(J. Y. Kim),문상필(S. P. Mun),서기영(K. Y. Suh),김영문(Y. M. Kim),김해제(H. J. Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper presents a single phase high power factor PWM boost rectifier featuring soft commutat-ion of the active switches at zero current. It incorporates the most desirable properties of conventional PWM and soft switching resonant techniques. The input current shaping is achieved with average current mode control and continuous inductor current mode. This new PWM converter provides zero current tum on and tum off of the active switches, and it is suitable for high power applications employing IGBT's. The principle of operation, the theoretical analysis, a design example, and ex peri-mental results from a laboratory prototype rated at 1.6[㎾] with 400[Vdc] output voltage are presented. The measured efficiency and the power factor were 96.2[%] and 0.99[%], respectively, with an input current THD equal to 3.94[%], for an input voltage with THD equal to 3.8[%], at rated load.
김주용(J. Y. Kim) 유공압건설기계학회 2010 드라이브·컨트롤 Vol.7 No.3
A vehicle suspension system performs two functions, the ride quality and the stability, which conflict with each other. An active suspension system has an external energy source, from which energy is always supplied to the system for continuous control of vehicle motion. Therefore, an active suspension system can have even more improved performance. Some control laws have been proposed for active suspension system, but in this paper, an optimal variable structure control(VSC) is proposed. The VSC method is well suited for a class of nonlinear system and can address the robustness issues to constant modelling errors and disturbances. This paper develops an optimal VSC controller and compares its performance to those of a passive suspension system and an active suspension system with an optimal controller. The transient and frequency responses are analyzed respectively.
슬라이딩 모드제어에 의한 유압 현가시스템의 설계변수 민감도 해석
김주용(J. Y. Kim) 유공압건설기계학회 2008 드라이브·컨트롤 Vol.5 No.2
The most vehicle active suspension system is activated by a hydraulic source and transmission system which has nonlinear characteristics. Even though we have designed a proper controller for this system, it sometimes cannot show remarkable performance characteristics because of many factors that undercut the performance of the hydraulic system, such as nonlinearity, modelling errors, parameter variations etc. So, the robust controller that prevents a system from lowering its performance is needed. In this study, the sliding mode control which is the representative one of robust controllers is adopted to investigate system parameter sensibility. As a result, the sliding mode controller shows robustness to the system parameters variations relative to the other controllers.