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이광기(K.K.Lee),구자겸(J.K.Koo),김진봉(J.B.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In order to solve the conflict between the ride comfort and the road holding, the semi-active suspension controller composed of the handling controller and the fuzzy comfort controller is proposed. The design of experiments and the optimization algorithm are used together to obtain the optimal fuzzy comfort controller. The second order regression model of the input membership function (design parameters) and the comfort index(object function) is obtained by the central composite design. Then the optimal membership function of the fuzzy comfort controller and be systematically adjusted with applying the conventional optimization algorithm in the obtained regression model. The frequency response analysis of sprung mass acceleration shows the control effectiveness of the proposed controller in the sprung mass resonance range(1-2Hz) and the middle range(3-8Hz).<br/>
이광기(K.K.Lee),구자겸(J.K.Koo),김진봉(J.B.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
Tolerance design of McPherson strut is performed according to the minimization of four responses (toe, camber, caster and kingpin inclination) analyzed by using the each response surface model made from stochastic design of experiments. After the each response surface model is constructed, the variation of response can be estimated by making approximation model as described in this paper and we can get the robust optimal solutions by using nonlinear programming method such as sequential quadratic programming method and generalized reduced gradient one. The design of experiments and the optimization algorithm are used together to obtain the optimal tolerance design of McPherson strut in this paper. The first order response surface models of the six lower arm pivot points (design factors) are constructed by using Taguchi's orthogonal array and the tolerance sensitivity analysis is also performed by applying variation approximation instead of Monte Carlo method.<br/>
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/>
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/>