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Research Papers

Oscillation Loop for a Vibratory Gyroscope and Its Experiment Study

[+] Author and Article Information
Liu Heng1

College of Communication Engineering,  Chongqing University, Chongqing 400030, China; Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, Chinaghost80boy@163.com

Su Wei

 Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, China

Zhang Fu-tang

 Institute of Electronic Engineering, China Academy of Engineering Physics, Mianyang 621900, Chinazft5431@163.com

1

Corresponding author.

J. Dyn. Sys., Meas., Control 134(1), 011004 (Dec 02, 2011) (8 pages) doi:10.1115/1.4005048 History: Received September 10, 2010; Revised July 18, 2011; Published December 02, 2011; Online December 02, 2011

This paper investigates the design of a self-oscillation loop for the gyroscope system. The dynamic equations describing this system are analyzed using the method of averaging, and a criterion for selecting the circuit parameters is established based on the analysis. The validity of the criterion and the effectiveness of the control scheme are verified by the experimental results obtained from the control parameters that satisfy or violate the stability criterion. The performance of the self-oscillation loop with a z-axis gyroscope is also evaluated in light of the experimental results. The self-oscillation loop based on the auto gain control scheme effectively tracks the resonance frequency of a z-axis gyroscope. This frequency corresponds to a standard Allan variance of 0.04 Hz in 8 min at natural frequency. The output signal-to-noise ratio (SNR) is about 90 dB, and the vibratory velocity amplitude shows a deviation of 0.5% in 8 min.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

A simplified model of a z-axis gyroscope

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Figure 2

Block diagram of the self-oscillation loop system

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Figure 3

Diagram of the implemented oscillation loop

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Figure 4

Photograph of the implemented oscillation loop and gyroscope

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Figure 5

Frequency sweep of the amplitude response of the gyroscope

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Figure 6

Output signal in the time range with VR  = 0.45 V

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Figure 7

Output signal in the time range with VR  = 1.137 V

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Figure 8

Output signal in the time range with VR  = 4.445 V

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Figure 9

Output signal in the time range with a −50 deg phase shift

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Figure 10

Output signal in the time range with a −168 deg phase shift

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Figure 11

Stable time of an output signal with R = 68 kΩ

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Figure 12

Stable time of an output signal with R = 0.1 kΩ

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Figure 13

Vibratory amplitude signal at 500 s in the time range

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Figure 14

Output frequency signal at 4000 s in the time range

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Figure 15

Output frequency signal at 1000 s in the time range

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Figure 16

Frequency data for a standard Allan variance analysis

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Figure 17

Standard Allan variance of the output frequency signal

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Figure 18

Output characteristics of the driving mode of the gyroscope

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