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문준희(Jun Hee Moon),박종호(Jong Ho Park),박희재(Heui Jae Pahk) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.6
A 6-DOF precision stage was developed based on parallel kinematics structure with flexure hinges to eliminate backlash, stick-slip and friction and to minimize parasitic motion coupled with motions in the other-axis directions. For the stage, lever linkage mechanism was devised to reduce the height of system for the enhancement of horizontal stiffness. Frequency response comparison between experimental results and mathematical model extracted from dynamics of the stage was performed to identify the system parameters such as spring constants and damping coefficients of actuation modules, which cannot be calculated accurately by analytic methods owing to their complicated structures. This newly developed precision stage and its identified model will be very useful for precision positioning and control because of its high accuracy and non-coupled movement.
회전체의 진동 측정과 분석을 통한 이상 진단 시스템 개발
문준희(Jun Hee Moon),강성범(Sung Bum Kang),박희재(Heui Jae Park) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Rotating machinery's faults such as unbalanced mass, eccentricity, and bearing fracture make the characteristic features of vibration different from that of normal operating condition. Fault diagnosis of the rotating machinery is achieved by the following ways: Firstly, identify the system in normal condition with a linear model. Secondly, assess the stochastic characteristic of the system in order to define the threshold of abnormal condition and to design a digital filter appropriate for the system. Finally, diagnose the system fault by error difference evaluation and by STFT analysis. The developed algorithm is experimentally verified for a CD-ROM drive.