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- 저자 : 만예동(Ruidong Man) (검색결과 2 건)
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박재엽(Jaeyeob Bak),김성준(Seongjun Kim),만예동(Ruidong Man),윤재득(Jaedeuk Yun),정융호(Yoongho Jung) (사)한국CDE학회 2020 한국CDE학회 논문집 Vol.25 No.1
Roll-on and roll-off (Ro-Ro) ship is the most economical transporting method for large freights such as train, helicopter, and aircraft body. To ship a large freight to a designated location on deck of Ro-Ro ship, tractor is used to pull a trailer with a connecting link of goose neck shape, on which the freight is secured. When the freight is long enough, the trajectory of trailer is not same as that of trailer and is a three dimensional path, which can cause any collision with ramp, gate, and obstacles in the deck. This research proposes a method of calculating possible trajectories to drive a tractor, along which does not cause any collision. Assuming reasonably low speed of a tractor, the proposed method generates possible tractor paths based on Bezier curve to calculate the trailer path considering tilt of tractor and trailer when they go up the inclined ramp. Finally, it calculates the best three paths without any collision in order of priority with minimum shipping time. The proposed method can be useful for the transport company to determine the shipping possibility as well as to generate driving order for a tractor driver.
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자동차 차체의 점 용접을 위한 용접건의 자세 범위 자동 계산
김연수(Yeonsu Kim),손충일(Chungil Son),만예동(Ruidong Man),정융호(Yoongho Jung) (사)한국CDE학회 2021 한국CDE학회 논문집 Vol.26 No.4
Car bodies need a large number of spot welding for lightweight and rigid bonding. Before the spot welding process, the posture of the selected weldgun must be reviewed first not to interfere with the welding objects and fixtures. A commercial CAD program can automatically calculate the posture range of a weldgun, but it takes too much time for use in the car industry. This study developed a method with a program to review the weldability automatically within an acceptable time. For the versatility of the developed program, the welding target and weldgun data are input in STL format that is a standard for CAD models. However, it does not provide any topology information of the models, which makes it difficult to get the necessary welding information. After getting the welding information, this study developed an algorithm to calculate the range of weldable posture of a weldgun within a few seconds by the Octree and the CPU parallel processing method. The proposed method can be applied not only to the automobile but also to spot welding processes in other fields.
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