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송철기 慶尙大學校生産技術硏究所 1998 生産技術硏究所論文集 Vol.14 No.-
Collision warning systems have been an active research and development area as the interests and demands for ASV's (Advanced Safety Vehicles) have increased. This paper presents an experimental investigation of a collision warning system for automobiles. A collision warning HiLS (Hardware-in-the-Loop Simulation) system has been designed and used to test the collision warning algorithm, radar sensors, and warning displays under realistic operating conditions in the laboratory. The collision warning algorithm is operated by a warning index, which is a function of the warning distance and the braking distance. The computer calculates velocities of the preceding vehicle and following vehicle, relative distance and relative velocity of the vehicles using vehicle simulation models. The relative distance and the relative velocity are applied to the vehicle simulator controlled by a DC motor.
선진안전차량 개발을 위한 차량 절대속도 추정법 (2) : 제5바퀴속도와의 비교실험
송철기 경상대학교 생산기술연구소 2002 工學硏究院論文集 Vol.2 No.-
Vehicle acceleration data from an accelerometer and wheel speed data from standard, 50-tooth antilock braking system wheel speed sensors are used to estimate the absolute longitudinal speed of a vehicle. We develop the four velocity estimation algorithms. And we compare experimental results with the Butterworth filtered speed from the fifth wheel and find that it is possible to estimate absolute longitudinal vehicle speed during a hard braking maneuver lasting three seconds.
선진안전차량 개발을 위한 자동차의 절대속도 추정 (Ⅰ)
송철기 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-
In order to develop the advanced safety vehicles such as the automatic braking system, the collision warning system, the collision avoidance system, and the automated highway system, the absolute vehicle speed should be well-estimated during severe braking condition and severe tracking condition as well as normal condition. The absolute longitudinal speed of a vehicle is estimated by using vehicle acceleration data from an accelerometer and wheel speed data from standard ABS wheel speed sensors. The proposed algorithm is verified experimentally to estimate speed of a vehicle, and is also shown to estimate the absolute speed with a 6% worst-case error during a hard braking maneuver.
송철기 慶尙大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.15 No.-
In a lightly damped cantilever beam, most of vibration energy is around natural frequencies. Based on this, a phase delay control for suppressing vibration of the beam is proposed in this paper. This controller is designed to behave like the velocity feedback controller at the frequencies of modes to be controlled. Also, this controller is designed in consideration of uncontrolled modes for the robust stability and the improvement for the sensitivity function of the control system. This phase delay control is applied to vibration suppression of a cantilever beam with a pair of a piezoelectric actuator and a piezoelectric sensor. Experimental results showed that the phase delay control works well.
송철기(Chul Ki Song) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
추돌회피장치와 자동화고속도로 시스템 등과 같은 선진안전차량을 개발하기 위해서는 정상주행조건에서는 물론 급발진이나 급제동 하에서도 차량절대속도를 잘 추정하여 차량의 안전을 확보하여야 한다. 차량절대속도를 추정하기 위하여 가속도계로부터의 차량가속도데이터와 ABS(Anti-locking braking system) 장착차량에 사용되고 있는 바퀴 속도센서로부터의 바퀴각속도데이터를 이용하였다. 차량절대속도를 추정하는 세가지 기본 알고리즘을 구성하고 실험으로 검증하였으며, 급제동이 3초 이상 지속되는 상황 하에서도 차량절대속도를 6% 오차 내 추정할 수 있음을 확인하였다.
대형항공기 날개 리브 가공을 위한 자동화 공정 시뮬레이션
송철기(Chul Ki Song),이대건(Dae-geon Lee),이창범(Chang-beom Lee),김갑순(Gab-soon Kim Kim) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.9
In this study, the automatic processing of the wing ribs of large aircraft was simulated. Specifically, in the simulation for the automatic processing of the fly ribs, the process of the automated loading device with a robot was examined, along with the wing rib processing and manufacturing automation processes. Moreover, the process time, corresponding to all the stages in the wing rib processing, was calculated. The results pertaining to the machining and manufacturing times of 34 wing ribs (Nos. 1–17), as obtained through the proposed simulation approach, indicated that the total machining time for the left and right wing ribs and rib guns was 537.7 h. The production time was calculated as 1,117.4 h. It is considered that the processing of the wing ribs of large aircraft can be automated in a factory, based on the results of the proposed simulation process.