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박해수(H. S. Park),윤용산(Y. S. Yoon) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
A finite element model of human head by linear biphasic theory is developed to study the dynamic response of the human head to impact. Intracranial tissues are modeled as a binary mixture, i.e. the fluid and solid phases. To validate the biphasic finite element formulation. the result of the numerical analysis of a one-dimensional wave propagation problem is compared with that of analytic solution. The permeabilities of the subarachnoid space and brain which may reproduce the same coup and contre-coup CSF( cerebral spinal fluid) pressures from the monophasic model are searched in the specified range of skull permeability. Then the intracranial pressure distributions from the biphasic model for the frontal impact are compared with those from the monophasic model. In general, the biphasic model produces a more injurious intracranial pressure distribution than the monophasic model.<br/>
DADS를 이용한 차량 정면 충돌시 승객거동 시물레이션 및 좌석벨트 설계
장태성(T.S. Jang),윤용산(Y.S. Yoon),이정주(J.J. Lee) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
Occupant and occupant restraint system were modeled mathematically using multi-body dynamics. Three dimensional models of HYBRIDIlI. 3-points seat belt. car interior system and energy absorbing steering system were descnbed. Occupant behaviour simulations in sled tests were done using DADS(Dynamic Analysis and Design System) and compared with real tests and MADYM03D simulations. Occupant behaviour simulations in frontal impact were also done for a passenger car and various injury parameters were investigated. The effect of parameters associated with seat belt on occupant injury was evaluated and the seat belt design was made to increase safety using orthogonal array and ANOVA.<br/>
송준규(J.G.Song),윤용산(Y.S.Yoon) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this papa, acceleration feedback controlled four wheel steering(AF4WS) without using observer is developed. To make the acceleration feedback controlled 4WS, the time derivatives of the body side slip velocity and the yaw rate are used. The AF4WS is constructed successfully by proper selection of the feedback control gains for these variables. And also Active Roll Stabilization control (ARS) are desinged. Conbining these two control strategies in harmony, the improved handling characteristic and ride quality are achiedved.<br/>
가속도의 상태변수화를 이용한 강인한 LQ 능동형 현가장치의 설계
이광표(K.P.Lee),윤용산(Y.S.Yoon) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, robust LQ active suspension has been designed using the technique to include the sprung-mass acceleration into a state variable. This technique is used to remove the weighting matrix related to the state variables and actuator force. The resultant problem is a Singular Linear Quadratic one. Asymtotic method is used to solve it. LQ active suspension designed in this study guarantees the stability against the actuator modeling error and has the better stability-robustness than the previous LQ active suspension. To show that, the simulation including the actuator model is performed. Additionally high frequency components of the actuator force are eligible to reduce using the performance index proposed in this study.<br/>
이광표(K. P. Lee),최규재(K. J. Choi),윤용산(Y. S. Yoon) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
In this study, the efficient multibody dynamic simulation program is formulated using Kane's equations. The zeros in partial matrices cause the inefficiency of simulation. To remove the zeros the relative coordinate tree arrays, relative coordinate exponent arrays and the modified partial matrices are formulated. Unnecessary calculations with zeros in forming the equations of motion are nearly removed using the modified partial matrices. To validate the simulation program, the sinusoidal driven quarter car model is simulated. And the results agree with those of DADS very well.<br/> <br/>