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Novel Piezo Driven Motion Amplified Stage
정호제,김정현 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
This paper presents a novel piezo driven motion stage employing multiple motion levers allowing for an amplification ratio thatexceeds 60x enabled by a newly contrived cross hinge structure. Optimization of the motion stage was performed and simulationresults proved the superiority of the newly devised cross hinge compared to the conventional flexure hinge. Measurements of themotion stage were made using an optical microscope. The motion stage was incorporated into a visually served close loop motioncontrol scheme and experimental results prove that the feedback system is capable of 20 nm nano-stepping.
지효근,정호제,김정현 경성대학교 공학기술연구소 2012 공학기술연구지 Vol.18 No.-
This paper presents the detection and diagnosis of air-conditioner electromagnetic sound through noise measurements. Electromagnetic sound originating from the motor is an unpleasant source of unwanted noise that should be detected at the manufacturing stage. A detection system using sound measurements was built and a detection algorithm based on FFT analysis is presented. Soun measurements are preferable over direct vibration measurement because it is non-contact and low cost. Experimental results show that our sound measurement system can detect electromagnetic sound effectively compared to using vibration measurements.