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Related Concept Videos

Gyroscope01:02

Gyroscope

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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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Gyroscope: Precession01:24

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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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Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
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Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
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Rotational Motion about a Fixed Axis01:26

Rotational Motion about a Fixed Axis

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A rigid body's rotation around a fixed axis makes every point within it trace a circular path around a specific line or point. The term given to this type of spinning is defined by the angular position, symbolized by the angle θ. This angle is gauged from a static reference line to the revolving object. From this angular position, any variation is referred to as angular displacement, denoted by dθ. The extent of this displacement can be calculated in degrees, radians, or...
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Rotation with Constant Angular Acceleration - I01:37

Rotation with Constant Angular Acceleration - I

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If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
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Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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Automatic Rate and Rate-Integrating Mode-Switchable Axisymmetric Gyroscope.

Lin Xuan1, Mingyang Lu1, Jing Liu1

  • 1School of Electronic and Information Engineering, Soochow University, Suzhou 251000, China.

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|June 24, 2022
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Summary

This study introduces a novel gyroscope capable of switching between rate and rate-integrating modes. This advanced gyroscope offers high accuracy and a wide input range, combining the advantages of both operational modes.

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MEMS gyroscopemode switchingrate moderate-integrating mode

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Area of Science:

  • Instrumentation
  • Mechanical Engineering
  • Control Systems

Background:

  • Traditional gyroscopes often operate in either rate or rate-integrating mode, limiting their applicability.
  • Achieving high accuracy and a wide dynamic range simultaneously in a single gyroscope presents a significant engineering challenge.

Purpose of the Study:

  • To develop a novel axisymmetric gyroscope capable of automatically switching between rate and rate-integrating modes.
  • To enhance gyroscope performance by integrating a digital control system and a specialized vibrating amplitude control method.

Main Methods:

  • A precession angle tracking algorithm was developed for automatic mode switching based on preset rate points.
  • A vibrating amplitude control method was proposed for the rate-integrating mode to ensure stable angular rate output.
  • A digital control system was implemented to manage the gyroscope's steering control and mode transitions.

Main Results:

  • The gyroscope demonstrated a bias instability of 0.106°/h and an angle random walk of 0.011°/√h in rate mode.
  • An input range exceeding ±5000°/s was achieved in rate-integrating mode with scale factor nonlinearity of approximately 116 ppm.
  • Switching delays were measured at 10 ms (rate to rate-integrating) and 100 ms (rate-integrating to rate).

Conclusions:

  • The novel mode-switchable gyroscope successfully combines the benefits of both rate and rate-integrating modes.
  • The developed system offers high accuracy, a wide input range, and stable performance through its advanced control strategies.
  • This innovation paves the way for next-generation gyroscopic systems in various applications.