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Bias 스프링을 이용한 형상기억합금 액츄에이터의 설계 방법
이승기,나승우 ( Seung Ki Lee,Seung Woo Na ) 한국센서학회 1998 센서학회지 Vol.7 No.6
The actuator using shape memory alloy spring with bias spring can act as a bidirectional actuator due to the restoring force of the bias spring. In the design of shape memory actuator with bias spring, the required design specifications are the generated force and the necessary stroke. To fulfill these requirements, shape memory alloy spring and bias spring should be designed carefully considering the specified application. In this paper, the novel design method for shape memory alloy actuator with bias spring, which does not require any assumptions from experience, has been proposed and verified by the test of fabricated shape memory alloy actuator. The experimental results show good agreements with calculated values, which guarantees the practical validity of our proposed design method.
광선추적을 이용한 정밀나사 비전검사용 광학계의 결상특성 향상
백순보(Soon Bo Baek),이기연(Ki Yeon Lee),주원종(Won Jong Joo),박근(Keun Park),나승우(Seung Woo Ra) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.9
Recent trends for the miniaturization and weight reduction of portable electronic parts is the use of subminiature components. Assembly of the miniaturized components requires subminiature screws of which pitch sizes are in a micrometer scale. To produce such a subminiature screw with high precision threads, not only a precision forming technology but also high-precision measurement technique is required. In the present work, a vision inspection system is developed to measure the thread profile of a subminiature screw. Optical simulation based on a ray tracing method is used to design and analyze the optical system of the vision inspection apparatus. Through this simulation, optical performance of the developed vision inspection system is optimized. The image processing algorithm for the precision screw inspection is also discussed.
CFRP 복합적층판의 적층배향·계면수에 따른 저속충격특성
임광희,박노식,나승우,김영남,이현,심재기,양인영 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.6
In this paper, this study aims at the evaluation on the characteristics of CFRP laminate plates using a falling weight impact tester. The experiment was conducted on several laminates of different orientation. A system was built for measuring the impact strength of CFRP laminates in consideration of stress wave propagation theory using a falling weight impact tester. Delamination areas of impacted specimens for the different ply orientation were measured with ultrasonic C-scanner to find correlation between impact energy and delamination area. Absorbed energy of quasi-isotropic specimen having four interfaces was higher than that of orthotropic laminates with two interfaces. The more interfaces, the greater the energy absorbed. The absorbed energy of a hybrid specimen containing a GFRP layer was higher than that of normal specimens.