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탁태오(Tae-Oh Tak),윤순형(Soon-Hyung Yoon) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
The purpose of this study is to investigate stability of a high speed train and to propose optimal design using sensitivity analysis of suspension design parameters. A form of equations of motion in tangent track and curve track is obtained based on each creep force. Tangent track and curve track equations include lateral, rolling and yawing motions of wheel sets, bogies, and carbodies. Three track cases have been chosen to stability assesment of a high speed train analysis. Sensitivity equations are set up by directly differentiating the equations of motion. This study defined Stability performance index of a high speed train in tangent track and curve track. The relative magnitude of the effect of suspension parameters on the critical speed is computed, and by adjusting these parameters, the increase of the critical speed is achieved.
탁태오(TaeOh Tak),이상일(Sangil Lee) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
자동차 현가장치는 콘트롤암이나 스트럿과 같은 구성요소가 기구학적 조인트나 스프링, 부싱, 스테빌라이저와 같은 컴플라이언스 요소들에 의해 결합된 기구-정력학적 시스템으로 생각할 수 있다. 따라서 현가장치의 설계를 위해서는 기구학적 설계점뿐 아니라 컴플라이언스요소들과 관련된 여러 가지 설계변수들도 동시에 고려되어야 한다 본 논문에서는 현가장치를 기구-정력학적 관점에서 정의하고 캠버, 토 등과 같은 정적설계인자로 정의되는 목표성능에 대한 최적설계를 수행하기 위해서 민감도해석에 기초한 일반적인 접근방법을 제안한다 또한 최적화의 과정을 SDAP(Suspension Design and Analysis Program)이라는 소프트웨어로 구현하였으며 이 소프트웨어의 기능과 성능에 대해서도 설명하고자 한다
탁태오(Tak Tae Oh),이벽림(Lee Pyoung Rim) 강원대학교 산업기술연구소 2001 産業技術硏究 Vol.21 No.1
The human arm is modeled by three rigid bodies(the upper arm, the forearm and the hand)with seven degree of freedom(three in the shoulder, two in the elbow and two in the wrist). The objective of this work is to present a method to determine the three-dimensional kinematics of the human elbow joint using a magnetic tracking device. Euler angle were used to determine the elbow flexion-extension, and the pronation-supination. The elbow motion for the various driving conditions is measured through the driving test using a simulator. Discomfort levels of elbow joint motions were obtained as discomfort functions, which were based on subjects’ perceived discomfort level estimated by magnitude estimation. The results showed that the discomfort posture of elbow joint motions occurred in the driving motion.
탁태오(T.O.Tak),황병하(B.H.Hwang) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In this study, a modeling method of power-assisted steering systems for vehicle dynamic analysis is presented. Pressure-flow relations of flow control valve is derived, and the equations of motion of a steering gear is obtained. Combining pressure-flow relations and equations of motion. the steering force can be represented as a function of steering wheel angle or torque. For complete representation a steering system, a steering linkage of a truck is modeled based on the multi body method.