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김형내,조진문,김석일,김동룡,김건상 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
Recently, the various driving simulator have been used widely to analyze the handling performance of vehicle and to verify the motion control algorithm of vehicle. In this study, a driving simulator based on the 20-DOF vehicle model is realized to estimate the handling performance and stability of a four-wheel-steering and/or four-wheel-driving vehicle. Especially the DC motor controlled four-wheel-steering actuator is modelled in order to reflect the effect of the responsiveness of actuator on the handling performance and stability. And the realized simulator can be applied to develope a real time simulation system for designing and testing the real vehicles.<br/>
비선형 타이어모델을 이용한 완전능동형 4WS 제어방법에 관한 연구
김형내(Hyung-Nae Kim),김석일(Seok-Il Kim),김동룡(Dong-Ryong Kim),김건상(Kun-Sang Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
The understeer characteristics of four wheel steering system(4WS system) in the high speed region has a negative effect upon the yaw velocity, leading to a decrease in the handling ability of vehicle. As a result, even if the side slip angle of vehicle can be kept up a minimum. the driver must compensate the decrease in the yaw velocity by increasing the steering wheel angle ,in order to track the desired vehicle path. In this study, to keep the side slip angle of vehicle at zero and achieve the suitable yaw velocity in vehicle motion, a full active 4WS system(FA 4WS system) with the actively steerable front and rear wheels is presented based on the nonlinear vehicle model and the model following control of yaw velocity. And the analysis results show the fact that, besides the excellent stability of vehicle, the FA 4WS system is able to realize the better handling performance of vehicle than the previous 4WS systems in the high speed region.<br/> <br/>
김경돈,이강주,최인휴,김형내,김찬봉 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-
A high-speed and intelligent CNC system has been developed by Turbotek Co., Ltd. This paper presents the study for commercialization of the developed CNC system. In order to acquire stability and reliability of the developed CNC system, its hardwares and softwares are improved. The CNC main unit is revised to a compact box-type CNC controller. Moreover, the integrated CNC main unit that has built-in and expandable I/O modules is also developed. Remote monitoring, fault diagnosis and NURBS interpolation functions are realized on the CNC system as software modules. Through these efforts, the developed CNC system can be loaded on machine tools successfully.