Research on the Precession Characteristics of Hemispherical Resonator Gyro

Abstract

Hemispherical Resonator Gyro (HRG) is a new type gyro with high precision, high reliability, shock resistance, no need of preheating, short start time, and long life. It is a kind of vibrating gyro with standing wave rotating along the sensitive base of annular precession, has a unique application prospect in the field of high precision inertial sensors, and is widely used in unmanned aerial vehicle control in complex environments. Based on the theory of the structure characteristics of the hemispherical resonator, the mathematical model of energy of the resonator is established to research the rule of resonant frequency when the hemispherical resonator is rotated around the central axis. In this paper, the influence of precession factor, which are the top angle, the bottom angle, and wall unevenness of the hemispherical resonator, are analyzed. A series of hemispherical resonator models are constructed by ANSYS software to prove the results of theoretical research. The simulation results show that precession factor of the hemispherical resonator is more sensitive of the top angle than the bottom angle, and the error of angular velocity which is caused by the change of the top angle is larger than that which is caused by the change of the bottom angle.

The Analysis and Simulation with the Fatigue Life of Hemispherical Resonator Gyro

“…Fatigue life is the number of cycles experienced by the hemispherical resonator when fatigue damage occurs under stress or the duration of time subjected to stress. The fatigue life is mainly affected by the size of the material, the concentration of the loading stress, the surface finish of the material specimen, and the frequency of the type of loading load [15]. The traditional method of fatigue life determination is based on fatigue damage theory and a large number of life test data.…”

Implementation of Hemispherical Resonator Gyroscope with 3 × 3 Optical Interferometers for Analysis of Resonator Asymmetry

“…Inversely, the Coriolis force can be calculated by measuring the change in the vibration pattern of the resonator. In order to improve the performance of HRG, many studies have been actively performed, mainly with the resonator itself [2][3][4][5][6], the driving method [7][8][9][10][11][12], and the signal processing [13][14][15][16][17]. However, the research on the vibration measurement method has been relatively insufficient.…”