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Related Concept Videos

Gyroscope01:02

Gyroscope

A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...
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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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PD Controller: Design

In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
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Open and closed-loop control systems

Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
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Proportional Integral (PI) controllers are a fundamental component in modern control systems, widely used to enhance performance and mitigate steady-state errors. They are particularly effective in applications such as automatic brightness adjustment on smartphones, where they excel at mitigating steady-state errors for step-function inputs. Unlike PD controllers, which require time-varying errors to function optimally, PI controllers leverage their integral component to address residual...
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Compact Hinfinity robust rebalance loop controller design for a micromachined electrostatically suspended gyroscope.

Gaoyin Ma1, Wenyuan Chen, Weiping Zhang

  • 1National Key Laboratory of Nano/Micro Fabrication Technology, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Institute of Micro and Nano Science and Technology, Shanghai Jiao Tong University, Shanghai, 200240, China.

ISA Transactions
|December 8, 2009
PubMed
Summary

A new H(infinity) robust rebalance loop controller offers improved performance for dual-axis micromachined rotational gyros. This controller provides better disturbance rejection and robustness compared to conventional methods.

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Area of Science:

  • Control Systems Engineering
  • Microsystems Engineering
  • Robotics

Background:

  • Dual-axis micromachined rotational gyros are crucial for navigation and stabilization.
  • Conventional controllers often struggle with performance limitations and robustness to variations.
  • Robust control is essential for reliable operation in dynamic environments.

Purpose of the Study:

  • To design a compact H(infinity) robust rebalance loop controller for dual-axis micromachined rotational gyros.
  • To achieve comprehensive performance including steady-state error, dynamic response, and disturbance rejection.
  • To ensure robustness against parametric variations and facilitate practical implementation.

Main Methods:

  • Incorporation of the bilinear pole-shifting transform.
  • Utilizing a weighted multivariable mixed-sensitivity framework.
  • Design procedure accommodating realistic performance requirements.

Main Results:

  • The H(infinity) robust controller demonstrates superior performance compared to conventional decentralized lead-lag controllers.
  • The controller achieves enhanced steady-state accuracy, dynamic response, and disturbance rejection.
  • Simulation results validate the controller's robustness and effectiveness under realistic scenarios.

Conclusions:

  • The designed H(infinity) robust controller is an efficient and practical substitute for conventional methods.
  • The controller offers a significant advancement in the performance and reliability of dual-axis micromachined rotational gyros.
  • This work contributes to the development of more sophisticated control strategies for MEMS devices.