A new metallic coriolis vibratory gyroscope (CVG) with multiple-shell structure

A type of new metallic coriolis vibratory gyroscope (CVG) with multiple-shell structure is presented. Based on principle of structural topology evolution, a 30 mm diameter resonator comprising a bottom plate, a cylindrical support and 3 resonant shells is designed. The proposed multiple-shell structure increases the effective vibrating mass of the resonator and simultaneously avoids Q factor decrease compared with the single-thick-shell design. The design methodology, manufacture process and circuit strategy of the new CVG is discussed in the paper. The tested Q factor of the metallic resonator is about 10,000 in the atmospheric environment, and the gyroscope prototype without vacuum package presents a bias instability of about 18.5 /°h under room temperature.