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FEM을 이용한 Electromagnetic Clutch 토크해석과 전기자 치수최적화
朴昌浩(Changhao Piao) 대한전기학회 2006 전기학회논문지 B Vol.55 No.5
This study tries to test and analyze the static friction torque generated by an electromagnetic clutch. Then the torque is improved by optimizing the shape of armature. For the purpose of design change and optimization of the electromagnetic clutch, the static friction torque prediction is very important. We construct an axi symmetric FEM model for analyzing the static friction torque and used a torque tester for evaluating the real torque. For a test, predicted static friction torque is compared with the experimental one to discuss the rationality of torque analysis process. The analytical result agrees well with experimental data, explaining the validity of the mathematical process and FEM model. After confirming the torque analysis process, the optimization process is investigated. The optimization result shows that the static torque is improved by changing the armature shape.
디스크 브레이크 임계속도에 의한 Hot Spot Analysis
이재한(Jaehan Lee),김명구(Myoung-Gu Kim),조종두(Chongdu Cho),박창호(ChangHao Piao),이상교(Sangkyo Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The purpose of the disk brake is to decelerate and stop the automobile as soon as possible by using the frictional force between the disk and pad. However the disk brake system is affected by the thermal problems such as wear and thermal crack. Due to these problems vibrations are produced and resulting into shortened life or breakdown of the disk brake system. Hot spot, which is a type of thermal problem, is the portion inside the disk where the heat is locally concentrated. The Hot spot causes thermo-elastic instability(TEI). When the area of the Hot spot increases continuously, it causes hot juddering into the braking system, which is a serious low frequency vibration and noise problem.