Angular Rate Sensor of piezoelectric Vibratory Gyro

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To use a piezoelectric vibratory gyro as an angular rate sensor, the consideration on the gyro characteristic was done by use of the derived circuit, and the results were confirmed experimentally. Our achievements on the project are concluded as follows:1. Equivalent circuits to simulate the gyro characteristic were derived for the first time.2. On the basis of the circuit, it was clarified that the output signal in no rotation is mainly caused by an input-output static coupling and the unbalanced force factors due to the inaccurate adhension of piezoelectric ceramics to the vibrator.3. The transit response of the gyro theoretically made it clear that the Coliolis force is of two frequency components in the sinusoidal variation of the applied angular rate.4. The driving and detecting methods of the gyro composed of a piezoelectric material were concretely proposed.5. Equivalent mechanical circuits of Sperry-type, Watoson-type and double-resonant-type tuning fork gyros were derived, and compared with each other.6. New constructions on simple-type and symmetric-composite-type tuning fork gyros were proposed, and the guide for designing the gyro was considered in detail.7. The other types except the above-mentioned gyros were devised, and the possibility in practical use was clarified.8. Manny experiments on the gyros were done, and coinsided with the analytical ones by the circuit.9. Some patents about the project were applied.