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Related Concept Videos

Gyroscope: Precession01:24

Gyroscope: Precession

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...
Concept of Resonance and its Characteristics01:19

Concept of Resonance and its Characteristics

If a driven oscillator needs to resonate at a specific frequency, then very light damping is required. An example of light damping includes playing piano strings and many other musical instruments. Conversely, to achieve small-amplitude oscillations as in a car's suspension system, heavy damping is required. Heavy damping reduces the amplitude, but the tradeoff is that the system responds at more frequencies. Speed bumps and gravel roads prove that even a car's suspension system is not immune...
Gyroscope01:02

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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,...
Forced Oscillations01:06

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When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
Design Example: Underdamped Parallel RLC Circuit01:17

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Consider designing an oscillator circuit, a crucial component in various electronic devices and systems. The objective is to create an oscillator circuit with specific characteristics: a damped natural frequency of 4 kHz and a damping factor of 4 radians per second. To accomplish this, a parallel RLC circuit is employed, known for its ability to sustain oscillations at a resonant frequency. In this case, the damping factor is pivotal in achieving the desired performance.
Starting with a fixed...
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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
15:25

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Published on: February 4, 2018

Temperature drift compensation for Hemispherical Resonator Gyro based on natural frequency.

Xu Wang1, Wenqi Wu, Zhen Fang

  • 1College of Mechanical Engineering and Automation, National University of Defense Technology, Changsha 410073, Hunan Province, China. wangxu-lit@163.com

Sensors (Basel, Switzerland)
|July 11, 2012
PubMed
Summary

Temperature changes affect Hemispherical Resonator Gyro (HRG) output. This study develops a temperature compensation model using the resonator's natural frequency, successfully reducing gyroscope drift for wider applications.

Keywords:
Hemispherical Resonator Gyro (HRG)driftnatural frequencytemperature compensation

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Area of Science:

  • Physics
  • Mechanical Engineering
  • Instrumentation

Background:

  • Temperature fluctuations significantly impact Hemispherical Resonator Gyro (HRG) performance.
  • Accurate compensation is crucial for reliable HRG operation across varying thermal environments.

Purpose of the Study:

  • To establish a temperature compensation model for HRGs based on resonator natural frequency.
  • To demonstrate the efficacy of this model in mitigating temperature-induced output drift.

Main Methods:

  • Developed a mathematical model correlating HRG temperature with its natural frequency.
  • Utilized Taylor expansion for the model and calibrated coefficients via experiments.
  • Applied stepwise linear regression for drift compensation based on natural frequency.

Main Results:

  • Experimental data confirmed a direct relationship between temperature and natural frequency.
  • Each temperature uniquely corresponds to a specific natural frequency.
  • The temperature-frequency compensation method effectively reduced HRG output drift.

Conclusions:

  • The proposed temperature-frequency compensation method is a valid and suitable approach for HRG drift reduction.
  • This technique enables HRG application over an expanded temperature range.
  • Natural frequency serves as a reliable proxy for temperature compensation in HRGs.