1994 Fiscal Year Final Research Report Summary
A Basic Study of High-accuracy Piezoelectric Vibrator Gyroscopes of Hybrid Type
| Project/Area Number |
05650236
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Dynamics/Control
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| Research Institution | Okayama University |
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Principal Investigator |
KAGAWA Yukio Okayama University, Department of Electrical and Electonic Engineering, Professor, 工学部, 教授 (10019200)
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| Co-Investigator(Kenkyū-buntansha) |
TSUCHIYA Takao Okayama University, Department of Electrical and Electonic Engineering, Lecturer, 工学部, 講師 (20217334)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Piezoelectric Gyroscope / Finite Element Method / Mode Separation / Degenerate Mode / Monolithic Type Gyroscope |
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| Research Abstract |
The use of the finite element approach is proposed for the characteristic prediction of piezoelectric vibrator gyroscopes. The finite element formulation including the effect of Coriolis force due to rotation is given for a piezoelectric thin plate in plane vibration, which is considered to be of a two-dimensional model. Using the program developed, the electric input admittance, the modal shapes, the change of the transmission characteristic of the output voltage due to rotation are demonstrated for three types of configuration. The development of monolithic type gyroscopes are kept in mind.
The following could be deduced from the analysis :
1) The proper of Coriolis force is clearly represented in the finite element formulation for the gyroscopes.
2) The vibratory frequency must be chosen as low as possible for high sensitivity to rotation.
3) The degenerated modes separate into the upper and lower mode due to the rotation.
4) The mode separation affects the electric input admittance and the output voltage.
5) The gyroscopes must be driven at the degenerated mode for high performance.
6) The simulated results show that the monolithic configurations are promising for sensitive detection of rotation and the use of these modes is possibly advantageous as the effect of the temperature change on the frequency change could be canceled to improve the temperature stability. The temperature characteristic is an important factor, and the effect can easily be incorporated in the program.
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