• Title/Summary/Keyword: Precision device

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A Study on the Ultra Precision Rotational Device using Smooth Impact Drive Mechanism (SIDM(Smooth Impact Drive Mechanism)을 이용한 초정밀 회전기구에 대한 연구)

  • Lee S.;Jeon J.U.;Park K.Y.;Boo K.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2006.05a
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    • pp.485-486
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    • 2006

  • This paper represents a ultra precision rotational device where the smooth impact drive mechanism(SIDM) is utilized as a driving mechanism. Linear motions of piezoelectric elements are converted to the rotational motion of disk by frictional forces generated between the rotational disk and the friction bars which are attached to the piezoelectric elements. This device was designed to drive a rotational disk using slip-slip motion mechanism based on stick-slip motion mechanism. Experimental results show that the angular velocity was increased in proportion to the magnitude of supplied voltage to piezoelectric element. In our device, the smooth rotational motion was obtained when the driving frequency has been reached to 500Hz under the driving voltage of 100V. The amount of step movement has been revealed to be $3.44{\times}10^{-4}$ radian.

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Design of a new five-link haptic device considering its dynamics

  • Moon, Chan-Woo;Lee, Sung-Ho;Chung, J.K.
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.2535-2539
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    • 2003

  • The haptic system becomes an essential device in the area of tele-operation, video entertainment and medical operation. To control a haptic device, impedance control method is widely used, but force sensor costs so much that open-loop control method is usually preferred for commercial purpose. In this case, modeled/un-modeled dynamics affects the performance of device. In this paper, we present a new 3DOF five-link type haptic device that we can reduce the effect of device dynamics and compensate its dynamics. We also evaluate its performance.

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Development of Onboard Power Supply Device for Precision Guided Kit (정밀유도 비행체 탑재용 전원공급장치 개발)

  • Park, Deok-Bae;Kim, Hyung-Shin
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.3
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    • pp.209-214
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    • 2008

  • A precision guided kit is a GPS/INS guided range extension system to improve the accuracy and availability of existing dumb bombs. The PSD(power supply device) installed in the GPS guided kit supplies electrical power to all electrical loads in the kit. In this paper, design process and test results of the PSD have been presented. Additionally, the performance results of the PSD during actual ground and flight tests have been described.

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Development of precision Moving Mechanism using Ellipsoidal Motion of piezoelectric Bimorph (압전 바이모프의 타원운동을 이용한 정밀 이동기구 개발)

  • 박한길;김준형;김수현;곽윤근
    • Journal of the Korean Society for Precision Engineering
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    • v.20 no.4
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    • pp.151-157
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    • 2003

  • A new type of precision actuator is developed using piezoelectric bimorphs. This type of actuator is applicable for the flat surface or in-pipe system and can make forward and backward motion. Two bimorphs are linked serially and two different phased voltages are applied to each bimorph. Therefore, The end of the bimorph makes ellipsoidal motion. The device moves by the friction force between the rubber attached at the bimorph end and the inner surface of the pipe. As the results, the driving range of the device is about 0~18Hz and the device guarantees very high linearity at low frequency, 0~1 Hz. The maximum velocity of the device is about 6mm/s at 10Hz. The developed mechanism is very simple and use piezoelectric bimorph. So, it is possible to miniaturize and educe the power consumption.

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Development of Tomotherapy couch device capable of yaw-directional correction (Yaw방향의 보정이 가능한 Tomotherapy couch device의 개발)

  • Chae, Moon Ki;Kwon, Dong Yeol;Sun, Jong Lyool;Choi, Byung Ki
    • The Journal of Korean Society for Radiation Therapy
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    • v.30 no.1_2
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    • pp.139-151
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    • 2018

  • Objectives : A self-made "Tomotherapy couch device" capable of correcting the Yaw direction was fabricated and evaluated for its usefulness. Materials and Methods : "Tomotherapy couch device" capable of correcting the Yaw direction is made of rigid fibreboard with a flexural strength of $200kg/cm^2$. CBCT Image from Novalis Tx and Iso-Align Phantom from MED-TEC were used to evaluate the physical accuracy. The treatment plan was designed using Accuray $Precision^{TM}$ and In House Head and Phantom. Accuray $PrecisionART^{TM}$ and $Precision^{TM}$ was used to evaluate dose. Results : Evaluation results, the self-fabricated device accurately corrected the setup error, Target dose was within 95 %~107 % of all. In order to directly evaluate the OAR dose according to the Yaw change, the absolute dose was measured. As a result, when the error in the Yaw direction was $3^{\circ}$, the specific OAR showed a maximum difference of 18.4 %. Conclusion : "Tomotherapy couch device" capable of correcting the Yaw direction can be manufactured at a lower cost compared to the effect, and it can prevent the patient's MVCT image dose for re-imaging. Accurate radiation therapy without errors can be performed.

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