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저상굴절 궤도차량의 AWS ECU 테스트 플랫폼을 위한 가상 주행환경 개발
최성훈(Choi Seong-Hoon),박태원(Park Tea-Won),이수호(Lee Soo-Ho),문경호(Moon Kyung-Ho) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
A bi-modal tram has been developed to offer an advanced transportation service compared with existing vehicles. The All-Wheel-Steering system is applied to the bi-modal tram to satisfy the required steering performance because the bi-modal tram has extended length and articulated mechanism. An ECU for the steering system is essential to steer wheels on 2nd and 3rd axles by the specific AWS algorithm with the prescribed driving condition. The Hardware-In-the-Loop Simulation(HILS) system is planned for the purpose of evaluating the steering system of the bi-modal tram. There are kinematic links with the hydraulic actuator to steer wheels on each 2nd and 3rd axles and also same steering mechanism as the actual vehicle is in the HILS system. Controlling the movement of hydraulic actuator which reflects the lateral steering reaction force on each wheel is the key to realize the HILS system, but the reaction force is continuously changed according to various driving conditions. Therefore, the simulation through the multi-body dynamics model is used to obtain the required forces.
평금형 압출용 금형의 NC 가공 S/W 개발에 관한 연구
조승래,이춘만,박태원 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
Square dies are widely used for hot extrusion processes with high production rate. Especially, such dies have some advantages in manufacture of aluminum products having arbitrary shapes of cross section, because aluminum alloys can be manufactured without lubrication at a relatively low temperature. The recent development of extrusion technology has brought high precision products with thin thickness. However, the design and manufacture of square dies mainly relies on experience of industrial engineers, it often takes much lead time due to the trial-and-errors of the engineers. To overcome such difficulty, this study develops a method of automatic generation of NC codes for the manufacture of extrusion square dies. This method utilizes both CAD data of a product and database associated with die design parameters, and finally generates NC codes for an aluminum product having an arbitrary shape of cross sections. Specifically, three types of NC codes are generated for : (1) Wire-cut EDM cutting of square dies, (2) Wire-cut EDM cutting of electrodes for die land, and (3) machining of the electrodes. To demonstrate the effectiveness of the method, it is applied to a practical example. The result shows that the method can reduce the lead time for the design and manufacture of square dies as well as eliminating engineers own experience.
154kv 대신 S/S 인출 전력구 시험발파 패턴 및 진동, 소음 계측에 의한 기존 CRACK에 미치는 영향 연구
강대우,박태원 동아대학교 건설기술연구소 1998 硏究報告 Vol.22 No.1
This area is covered in Andesite of high compression strength and located in PUSAN SEOKU. There are many old houses around shaft site. So, we must have a cautious blasting operation. A total of 40 blasts were test at DAE-SHIN Shaft site to study the magnitude and frequency characterization of blast-induced vibration. The effect of viblating frequency on structual damage and site-specific scaling to define the empirical equations were also discussed. The results can be summarized as follows: 1. Some empirical equations were obtained. V=K{(D/W)1/3}^(-n), where the values for n and K are estimated to be -1.407 to -2.202 and 643.3489 to 7283.2104 respectively. 2. Dominant frequencies at shot distance are in the range of about 75.0 to 91.8 Hz, with some exceptions of about 50Hz, Frequencies obseverd at long distance are in the range of 10 to 20Hz. It is apparent the shift of dominant frequency down to lower levels at long distance.