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[동력전단계부문] 차량의 조종안정성 해석시스템을 이용한 설계변수의 영향에 관한 연구
임형은(H.E.Im),김우영(W.Y.Kim),안기원(K.W.Ahn),황원걸(W.G.Hwang) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An analysis system of a vehicle handling performance is developed. The analysis system can simulate driving tests to evaluate the vehicle handling performance. A 3-dimensional nonlinear vehicle model with a steering system is proposed. Based on this vehicle model, driving tests are simulated. With the analysis system, the handling performance of a large bus that has a front and rear rigid axle is evaluated. The influence of de sign parameters on handling performance is investigated<br/> The vehicle model has 13 degrees of freedom which are 10 degrees of motion in sprung and unsprung mass and 3 degrees of freedom in steering system. A driver model was developed using PID and fuzzy controller to steer the vehicle along a prescribed path during a closed loop simulation. Good agreement was obtained between experimental and simulated results in single lane change.<br/> To evaluate the vehicle handling performance, the vehicle handling characteristics were classified as follows: (I) steering characteristics and characteristic velocity; (2) response time and amplification; (3) frequency response. The influence of front suspension spring stiffness, damping constant, steering overall ratio, and rear tire concerning stiffness on handling performance was investigated. Results of the developed program were compared with those of DADS, a commercial program for multibody dynamics analysis. Good agreement was obtained between results of the developed program and DADS in a parameter study
김기세(K.S.Kim),임형은(H.E.Im),황원걸(W.G.Hwang) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper develops a 11 d.o.f. dynamic model, and analyze the ride comfort of a vehicle. The dynamic model is derived with MATHEMAT1CA program and C language. The time responses over several deterministic roads are simulated, and the frequency response for probabilistic irregular road are examined. The computational results were compared with the test results, which showed good agreements. The index of ride comfort considering the equal comfort curve of human body is used to investigate the effect of parameter change.<br/>