Analysis and experiment of the zero bias drift of the vibratory cylinder gyroscope caused by nonlinear vibration

Vibratory cylinder gyroscope (VCG) is an important type of vibratory gyroscopes with a lot of advantages. Manufacturing errors and material inhomogeneity are regarded as the main cause of the zero bias drift of the VCG. In this paper, the nonlinear vibration of the cylindrical resonator is considered. It is analyzed that the nonlinear vibration can cause additional drift of the VCG's output. Experiments are implemented in this research. According to the testing results, the metal cylindrical resonator is a soft nonlinear vibration system. To increase the stability of the VCG, the cylindrical resonator should be trimmed to a specific frequency split.