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[論文] 4륜 조향시스템이 차량의 주행역학적 특성에 미치는 영향
심정수(J. S. Shim),허승진(S. J. Heo),유영면(Y. M. Yoo) 한국자동차공학회 1990 오토저널 Vol.12 No.3
Equipments of passenger cars with modern technologies are gaining their importance. Related with such developments, the four-wheel steering system (4WS) was introduced recently to a few passenger cars in the market. The most important research goal on this new steering system is improvement of active safety, in other words, improvement of handling characteristics of vehicle stability and manoeuvrability.<br/> This paper presents a computer-based study about the effects of 4WS system on the vehicle handling characteristics. A simple bicycle model of 2 d.o.f.is used for the development of four wheel control algorithms of 4WS system, and the rear wheel control strategies are applied to a complex vehicle model of 16 d.o.f.for simulation of selected ISO-driving tests. <br/> The 4WS systems, which reduce the sideslip angle at the mass center of vehicle to almost zero, show much improved handling characteristics compared to that of the conventional 2WS system. These 4WS systems, however, result in vehicles with eigen-steer characteristics of extreme understeer behaviour.
간헐 회전식 약실을 적응한 자동포 시스템의 디지털 제어
임승철,김기갑,심정수,길성진,김홍철,이건하,차기업,조창기,홍석균,Lim, S.C.,Kim, K.K.,Shim, J.S.,Kil, S.J.,Kim, H.C.,Lee, G.H.,Cha, G.U.,Cho, C.K.,Hong, S.K. 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.2
Lately, there exist growing demands to increase the firepower of mid-calibre automatic guns despite spatial limitations of armament. In this context, ammunitions of simple cylindrical shape are considered so advantageous that associated automatic guns are under development incorporating an intermittently rotating chamber mechanism. In this paper, relevant subsystems for such guns are to be described, and a digital controller to automate the entire system as well. Via dynamic simulations it proves to function well being able to drive the chamber at any constant speed up to 200spm, which is merely limited by the recoil performance. It is remarkable that the system synchronization idea in use is applicable to any other multi-actuator systems that should operate on the basis of event rather than time.
임승철,김기갑,심정수,길성진,이건하,차기업,조창기,홍석균,Lim, S.,Kim, K.K.,Shim, J.S.,Kil, S.J.,Lee, G.H.,Cha, G.U.,Cho, C.K.,Hong, S.K. 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.1
Lately, there exist growing demands for the use of CTAs(Cased Telescoped Ammunitions) to increase the firepower of mid-calibre automatic guns despite spatial limitations of armament. In this paper, for automatic CTA guns a rotating chamber mechanism is designed based on parallel index concept. Via dynamic simulations it proves capable of smooth operation even at as high a firing rate as 200spm. Subsequently, motor controllers are synthesized to drive the chamber at any constant speed and also to control positions in the presence of large disturbances caused by the intermittently-rotating load. It is remarkable that we successfully adopted a disturbance observer to treat disturbances only with a moderate bandwidth of the closed-loop system.
주파수 감응식 Semi-Active Suspension 제어 알고리즘
곽병학(B.H.Kwak),심정수(J.S.Shim),이광기(K.K.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
Suspension control using the sky-hook control algorithm is very effective to improve the ride comfort of a vehicle system. However, the algorithm suffer from the poor damping effectiveness at wheel resonance frequency, which makes the road holding ability of the tire worse. To solve the problem, in this paper, the original sky-hook damping algorithm is modified to have the controllability of wheel resonance. In order to verify the control effectiveness of the proposed algorithm, experiments were performed using a real vehicle system equipped with four stage variable damper operated by electro-magnetic actuator. It is shown that the proposed algorithm can be a good solution for compromising the ride comfort and the road holding ability.<br/>
송동우(D.W.Song),심정수(J.S.Shim),정남훈(N.H.Chung) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
In this study, the attitue control logic for a Low-band width Active Suspension System is developed to improve the roll, pitch, and yaw stability of a passenger car under various driving conditions. In order to reduce roll and pitch angle of a car under cornering or braking/acceleration, Anti-roll & Anti-pitch control algorithms is used. And, to acquire Yaw stability in fast cornering, a special algorithm which is designed to change steering characteristics through front/rear roll moment distribution is added. In addition to these logics, Jack-up compensation algorithm is used to improve cornering stability. For performance verification of control logics, full vehicle model, active suspension hydraulic model, and digital control model is constructed using ADAMS package and Fortran language. With this model, we fulfilled the simulation of various driving states, and confirrn the performance of logics.
이광기(K.K.Lee),심정수(J.S.Shim),곽병학(B.H.Kwak) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
In this paper, an effective algorithm of vehicle attitude control, which is constructed by fuzzy description of the driving patterns of expert drivers, is proposed. Severe driving tests such as steering, traction, and braking are performed to extract the control algorithm in the form of the linguistic rules. The proposed algorithm is realized using a mid-size passenger car equipped with a high speed digital controller which is emposed of DSP(Digital Signal Processor), A/D, and D/A converters. Several driving tests are performed to verify the control effectiveness of the proposed algorithm. It is shown that the algorithm has the precise ability in vehicle attitude control during the drivers' handling operation. Also, the systematic tuning process can be easily obtained using the fuzzy description.<br/>