• Title/Summary/Keyword: 동조자이로스코프

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Analysis and application of the dynamically tuned gyroscope (Angular velocity sensor of EOTS) (동조자이로스코프의 해석 및 응용 (전자광학추적기의 회전각속도 센서))

  • Im, Sung-Woon
    • Journal of Sensor Science and Technology
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    • v.5 no.4
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    • pp.47-56
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    • 1996
  • The basic principle and characteristics of a DTG(dynamically tuned gyroscope) are presented in this paper, which is used for the detection of disturbance and for the stabilization of gimbal. An accurate model of the rate mode DTG is proposed. This model has a resonance characteristics which is more similar to the characteristics of practical systems than the conventional 2nd order system model. Therefore, this model is applicable to the general rate mode gyroscope. Some problems at using DTG for a real electro optical tracking system are discussed and a solution is described.

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Dynamic Analysis and Evaluation of a Microgyroscope using Symmetric 2DOF Planar Resonator (대칭형 2자유도 수평 공진기를 이용한 마이크로 자이로스코프의 동특성 해석 및 평가)

  • Hong, Yoon-Shik;Lee, Jong-Hyun;Kim, Soo-Hyun
    • Journal of Sensor Science and Technology
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    • v.10 no.1
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    • pp.1-8
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    • 2001
  • Conventional microgyroscopes of vibrating type require resonant frequency tuning of the driving and sensing modes to achieve high sensitivity. These tuning conditions depend on each fabricated microgyroscopes, even though the microgyroscopes are identically designed. A new micromachined resonator, which is applicable to microgyroscopes with self-toning characteristics, is presented. Since the laterally driven two degrees of freedom (2DOF) resonator was designed as a symmetric structure with identical stiffness in two orthogonal axes, the resonator is applicable to vibrating microgyroscopes, which do not need mode tuning. A dynamic model of the resonator was derived considering gyroscopic application. The dynamic model was evaluated by experimental comparison with fabricated resonators. The microgyroscopes were fabricated using a simple 2-mask-process of a single polysilicon layer deposited on an insulator layer. The feasibility of the resonator as a vibrating microgyroscopes with self-tuning capability is discussed. The fabricated resonators of a particular design have process-induced non-uniformities that cause different resonant frequencies. For several resonators, the standard deviations of the driving and sensing frequencies were as high as 1232Hz and 1214Hz, whereas the experimental average detuning frequency was 91.75Hz. The minimum detuned frequency was 68Hz with $0.034mVsec/^{\circ}$ sensitivity. The sensitivity of the microgyroscopes was low due to process-induced non-uniformity; the angular rate bandwidth, however, was wide. This resonator could be successfully applicable to a vibrating microgyroscopes with high sensitivity, if improvements in uniformity of the fabrication process are achieved. Further developments in improved integrated circuits are expected to lower the noise level even more.

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New Angular Velocity Pick-off Method for Dynamically Tuned Gyroscope (동조자이로스코프의 새로운 각속도 검출 방법)

  • Ma, Jin-Suk;Lee, Kwang-Il;Kim, Woo-Hyun;Kwon, Woo-Hyen;Im, Sung-Woon;Byun, Seung-Whan;Cheon, Ho-Jeong
    • Journal of Sensor Science and Technology
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    • v.8 no.2
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    • pp.139-147
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    • 1999
  • In this paper, we present the new angular velocity pick-off method for DTG (dynamically tuned gyroscope) which is widely used in various inertial navigation systems and motion control systems. In case of the external angular velocity input, the proposed scheme can make a smaller tilt-angle rather than that of conventional PI method in the transient and steady state because it has an additional inner rebalance loop with a mathematical model of the real gyroscope. So, without any mechanical redesign of the DTG, its dynamic range can be enlarged by the proposed method. The theoretical analysis and simulation model of DTG with the proposed scheme are given. Finally, the proposed scheme is verified.

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Error Aalysis of Mechanical Parts and Dynamic Balancing in A Dynamically Tuned Gyroscope (동조자이로스코프의 기계부 오차 해석 및 동적밸런싱)

  • J.O. Young;C.G. Ahn;Lee, J.M.
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.2
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    • pp.13-22
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    • 1997
  • Strapdown inertial navigation system(SDINS) is a navigational instruments necessary to guide and con- trol a free vehicle. In this study, an error analysis of mechanical parts is carried out for manufacturing a dynamically tuned gyroscope. The errors usually come from the tolerance in machining and assembly. In the error analysis, a criterion to be considered during designing and manufacturing is proposed by quanti- tatively analyzing the effect of DTG performance by tolerances. The theory of dynamic balancing is deduced and unbalance is reduced through experiment.

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Analysis of flexure stiffness and stiffness test in DTG (동조 자이로스코프 서스펜션의 굽힘자 해석 및 시험)

  • Youn, J.O.;Kim, J.H.;Lee, J.G.
    • Journal of the Korean Society for Precision Engineering
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    • v.13 no.5
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    • pp.30-37
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    • 1996
  • The objective of this research is to explore the analysis and test method for the reliable design and fabrication of a high precision dynamically tuned gyroscope. The tuning frequency is decided by the calculation of mass moment of inertia of rotor and gimbal and the stiffness of flexures. Due to the complex geometry of the flexure, calculation of the stiffness of the suspension flexure is difficult. In this paper, three analytical methods for obtaining the stiffness of the flexure are porposed and a special testing method is used for checking the accuracy of the computed results.

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Digital Rebalance Loop Design for a Dynamically Tuned Gyroscope using Frequency Weighted H$_2$ Controller (주파수 가중 H$_2$ 제어기를 이용한 동조자이로스코프의 디지털 재평형루프 설계)

  • 송진우;이장규;강태삼
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.9
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    • pp.1131-1139
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    • 1999
  • In this paper, we present a wide-bandwidth digital rebalance loop for a dynamically tuned gyroscope(DTG) based on {{{{ { H}_{2 } }}}} methodology. The operational principle and the importance of a rebalance loop are explaind, first. The augmented plant model is constructed, which includes a gyroscope model and an integrator. An {{{{ { H}_{ 2} }}}} based controller is designed for the augmented plant model. To verify the performance of the controller, a digital rebalance loop for a DTG is designed, fabricated and experimented. Through frequency response analyses and experiments using a real DTG, it is confirmed that the controller is more robustly stable and has a wider bandwidth compared with those of a conventional PID controller, contributing to the performance improvement of a DTG.

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Design and fabrication of a SDINS utilizing DTC (동조자이로스코프를 이용한 스트랩다운 관성합법장치의 설계및 제작)

  • 김종웅;백승철;이광원;안영석;이허수
    • 제어로봇시스템학회:학술대회논문집
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    • 1988.10a
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    • pp.643-648
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    • 1988
  • A strapdown inertial navigation system fabrication utilizing dynamically tuned gyroscope was finished as a first stage development. So it's design, fabrication and tests are reported. Although this system lacks in accuracy compared with the cimballed system, factors such as low cost, small size and lightness make it useable in wide range of applications. The initial cost for investment is relatively cheap, and so it is best suitable for local development in various kind of inertial navigation system. Since all of the locally used systems are imported and even with it's close relation to the military, foreign technical transfer is practically non-existent. The independent local development of such system at a time of domestic initation in aerospace and defense industry, can be seen as a significant milestone in the advancement of the inertial navigaion system field.

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Design of the Temperature Controller for a Dynamically Tuned Gyroscope Using Parameter Estimation Methods (계수 추정 기법을 이용한 동조자이로스코프 온도 제어기의 설계)

  • Song, Jin-Woo;Lee, Jang-Gyu;Kang, Tae-Sam;Kim, Jin-Won
    • Proceedings of the KIEE Conference
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    • 1996.07b
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    • pp.1146-1148
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    • 1996
  • In this paper, uncertain parameters of the heat transfer model of a Dynamically Tuned Gyroscope (DTG) are estimated by the Recursive Least Squares (RLS) method. Also, using this model, a temperature controller for a DTG is designed. As the temperature controller, a PI controller is used. It is presented that a controller can be easily designed when the heat transfer model of a DTG is used. By simulations and experiments, it is shown that the estimated heat transfer model is appropriate and the desired performance of the temperature controller is satisfied.

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Investigation on the Vibration Characteristics of a Symmetric 2DOF Polysilicon Resonator (대칭형 2자유도의 폴리실리콘 공진 구조체에 대한 진동특성 분석)

  • Hong, Yun-Sik;Lee, Jong-Hyeon;Kim, Su-Hyeon
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.11
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    • pp.81-87
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    • 2000
  • A new resonator that is fabricated by single polysilicon layer process is presented. The resonator can move in two orthogonal direction on the plane parallel to the substrate. And the resonant frequencies of the two modes are intrinsically designed to be identical since the overall structure of the resonator is symmetric about the two directions of motion. Since the resonator ideally has two identical vibration mode, it can be applied to various micro-devices that requires multi DOF motion, especially to microgyroscopes. To investigate the feasibility of application of the resonator, dynamic model of the resonator including the nonlinear behavior of driving electrodes is derived and evaluated with the fabricated one, and the self-tuning characteristics are proved though experiments.

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