http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
기계가공작업을 위한 강성이 큰 2단 평행구조 로보트 암 설계
이민기 대한기계학회 1995 대한기계학회논문집 Vol.19 No.1
Industrial robot has played a central role in the production automation such as welding, assembling, and painting. There has been, however, little effort to the application of robots in machining work(grinding, cutting, milling, etc.) which is typical 3D work. The machining automation requires a high stiffness robot arm to reduce deformation and vibration. Conventional articulated robots have serially connecting links from the base to the gripper. So, they have very weak structure for he machining work. Stewart Platform is a typical parallel robotic mechanism with a very high stiffness but it has a small work space and a large installation space. This research proposes a new machining robot arm with a double parallel mechanism. It is composed of two platforms and a central axis. The central axis will connect the motions between the first and the second platforms. Therefore, the robot has a large range of work space as well as a high stiffness. This paper will introduce the machining work using the robot and design the proposed robot arm.
Nature-inspired 3D Topological Liquid Capillary Diode
이민기,오준호,임현의,이진기 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Directional liquid-transport surfaces have various applications, such as open microfluidic devices, fog collection, oil–water separation, and surface lubrication. However, current liquid-transport surfaces are expensive, complicated to manufacture, and lack scalability. Moreover, they exhibit low transport speeds and distances. In this study, we used a laser cutter to fabricate scalable, low-cost unidirectional liquid-transporting surfaces with nature-inspired technology. The spreading and pinning mechanisms of horned lizards and pitcher plants were adapted to design a liquid diode with a 3D wedge-shaped channel which is composed of V-groove channel. The developed liquid capillary diode exhibited the fastest transport speed (3–17.7 mm s–1) reported so far, and a large normalized distance (L/R: transport distance/radius of dispensed droplet). The transport distance increased with the square root of time under various contact angles and liquid viscosities, which agreed well with the theoretical scaling results obtained using the modified Washburn model. Additionally, the flexible liquid capillary diode operates adequately even when bent with the maximum curvature of 0.1 mm–1. Our results provide better design guidelines for 3D topological liquid-transport surfaces for various applications.