A Method of Eliminating Temperature Drift of Cylindrical Shell Gyroscope Using Dual Node Electrodes

Abstract

The invention discloses a method for eliminating temperature drift of a cylindrical shell gyro by utilizing a dual-node electrode. The method comprises the following steps: (1) setting a piezoelectric electrode positioned at a detection node position as two electrodes, and forming the dual-node electrode, wherein the two electrodes are positioned on two sides of a detection rigid shaft and form a small included angle with the detection rigid shaft, and the included angle between the two electrodes is recorded as Delta theta; (2) measuring electrode signals Vds, Vn1 and Vn2 of the gyro in the absence of angular velocity input, and calculating the Delta theta; and (3) calculating the angular velocity, namely performing demodulation and low-pass filtering on the signals of the dual-node electrode, and calculating the angular velocity according to the filtered signals. The method disclosed by the invention has the advantages of simple principle, simplicity in implementation and low implementation cost.

Description

technical field [0001] The invention mainly relates to the field of solid wave gyroscopes, in particular to a method for eliminating the temperature drift of cylindrical shell gyroscopes by using double-node electrodes. Background technique [0002] Cylindrical shell vibrating gyroscopes use the inertial effect of elastic waves in an axisymmetric cylindrical shell to achieve angular velocity measurement. Good vibration, long service life and other advantages, so the development and application prospects are extremely broad. [0003] The working principle of the cylindrical shell vibrating gyroscope is as follows: apply AC voltage to the four piezoelectric excitation electrodes perpendicular to each other on the support beam of the resonator, and the electrodes generated by the inverse piezoelectric effect drive the support beam to vibrate, so that the vibration is transmitted to the resonant ring. inspire as figure 1 The first mode of the harmonic oscillator is shown. Dep...

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Problems solved by technology

[0005] The traditional method to eliminate the temperature drift of the gyro is to perform temperature compensation on the gyro. Due to the hysteresis effect of temperature measurement, the accuracy of temperature compensation is usually not high, and it increases the complexity of the system and increases the cost.

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