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멀티 스케일 다중 전개형 협업 로봇을 위한 요소 기술 개발
주종남(Chong Nam Chu),김한(Haan Kim),김정률(Jeongryul Kim),송성혁(Sung-Hyuk Song),고제성(Je-Sung Koh),허승주(Sungju Huh),하창수(ChangSu Ha),김종원(Jong Won Kim),안성훈(Sung-Hoon Ahn),조규진(Kyu-Jin Cho),홍성수(Seong Soo Hong),이동준(Do Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.1
주종남(Chong Nam Chu),박민수(Min Soo Park) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Creative engineering design course has been offered at Seoul National University since 1993. The purpose of this course is to teach basic skills to design, fabricate and test electro-mechanical device through hands-on experience. The major efforts in this course are on creativity and engineering experience. The course consists of 2 hours of lecture and 2 hours of laboratory (3 credit course). On the first day of the semester, students form teams of five students. At the 3rd week, linkage project is assigned. For 2 weeks, each team makes two simple linkages. At the 6th week, game rules are announced and material kits are distributed for the main robot contest. Each team freely designs and makes one wire controlled robot and one autonomous robot. At the 11th week, robot contest is held using the robots students made during the semester. Final grade is based on the results of the projects, contest, and class/lab attendance.
Fabrication of an oil–water separation copper filter using laser beam machining
Ha, Kyoung Ho,Chu, Chong Nam IOP 2016 Journal of micromechanics and microengineering Vol.26 No.4
<P>In this study, oil and water are successfully separated using a copper filter that is fabricated using only laser beam machining. Even though copper is hydrophilic and recast copper material, which inevitably results during laser beam machining, is super-hydrophilic, the filter can prevent the water from penetrating and allow oil to flow based on surface tension of the liquids at the hole exit. For practical uses of the filter, both the pressure differences at which the filter is able to retain its ability to separate and the oil penetration rate of the filter are revealed. The fabrication process is simple and time-saving, and the filter has high durability because of lack of surface coating or surface chemical modification.</P>
Kim, Seong Han,Chu, Chong Nam Professional Engineering Publishing Ltd 2015 Proceedings of the Institution of Mechanical Engin Vol. No.
<P>This study proposes hardware-in-the-loop simulations to develop the motor speed map of electrohydraulic power steering systems for heavy commercial vehicles. The current method that relies on the test driver’s hands and feet to obtain electrohydraulic power steering motor speed maps causes a number of problems, such as inaccurate steering rates and vehicle speeds and the risk of rollover during tests. In order to overcome these weaknesses, this study employs a hardware-in-the-loop simulation system, a vehicle model, and an experimental development method. A hardware-in-the-loop simulation system was set up to simulate a steering system on the road. The system includes a system drive, data acquisition, system controller sets, and an electrohydraulic power steering system. This hardware-in-the-loop simulation system is controlled in real time because the amount of the torque from the resistant torque motor, which applies the self-aligning moments generated between the ground and the tires to the steering system, is affected by the steering angle of the steering-wheel motor. For calculation of the resistant torque with respect to various driving conditions, a vehicle model was employed in this study. It includes calculation of the self-aligning moments with the tire property data, the moments due to the kingpin inclination, the vehicle dynamics, and the steering-system modeling. The resultant values were input into the resistant torque motor. In addition to the hardware-in-the-loop simulation system and the vehicle model, the concept of a desirable steering torque which parameterizes the steering feel was introduced in this study. Using the desirable steering torque, the steering feel could be quantified, and desirable steering feels were established. In this study, in order to validate the hardware-in-the-loop simulations, a heavy commercial vehicle was designated as the target vehicle. The target vehicle’s tire and specifications such as the dimensions, the weight, the steering system, and the mechanical links were adopted, and a desirable steering-torque map was established by a professional test driver. The development results were presented.</P>
Effect of Machining Area on Material Removal Rate in Strip EDM
Song, Ki Young,Chu, Chong Nam Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.12
Strip EDM is similar to wire EDM, except that the electrode is a roll of brass strip. In this study, investigated is the effect of machining area on material removal rate (MRR) in strip EDM, The MRR was measured according to different machining areas and different electrical discharge conditions. For a given discharge condition, optimal machining area for maximum MRR was identified. The optimal machining area was larger under higher discharge energy condition. It is shown that strip EDM is much more efficient than wire EDM because material removal rate is much higher and the electrode consumption is much less.