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A Screwjack Mechanism Based Separation Device Driven by a Piezo Actuator
조명신,김병규,황현수,이민형,Michael R. Zinn 한국정밀공학회 2012 International Journal of Precision Engineering and Vol.13 No.11
A non-explosive separation device using a screw jack mechanism is designed, fabricated and tested for a small satellite. In order to activate the proposed device with a small amount of torque, we employ a double actuation mechanism which is initially triggered by a piezo actuator and finally activated by a spiral spring. Through theoretical analysis and experimentation, the specifications of the spiral spring and piezo actuator to activate the separation device are determined. Owing to the novel design of the mechanism, it can be activated within 0.65 sec under 100 kgf with 0.45 kgf-cm of torque. Since screw jack mechanisms have commonly been used to upload heavy mass, and have self-locking capabilities under high load, a screw jack is also employed for the proposed separation device. Therefore, it can tolerate launching vibration as well as a thermal vacuum test without coming unfastened. The shock level is limited to 12 G, which is appropriate for a small satellite.
마찰 구동형 압전 작동기를 이용한 카메라 손떨림 진동보상 기법 연구
조명신,황재혁,Cho, Myungsin,Hwang, Jaihyuk 항공우주시스템공학회 2015 항공우주시스템공학회지 Vol.9 No.4
The focal plane image stabilization for a camera is one of the most effective method that can increases the digital camera's image quality by compensating the vibration disturbance. The optical image stabilization can be implemented by making the focal plane to trace the path of incident light. To control the position of focal plane motion compensating stage precisely, a nonlinear control algorithm has been applied by considering coulomb friction which is nonlinear behavior of the compensator system. In our study, we have analyzed the hand shaking vibration using the gyro sensor, and made a mathematical model of compensating stage containing optical sensor and piezo-actuator. Then the nonlinear control algorithm has been designed and its performance has been verified by experiment. In this study, a friction driven peizo-electric actuator with $1{\mu}m$ resolution and 10mm/s speed has been used for stage movement.