Analysis of acceleration influence on HRG vibration detection system

The effect of acceleration on hemispherical resonance gyroscope (HRG) detection system is analyzed based on the working principle of vibration detection system. Firstly, the mathematical model of vibratory sensor is built, and then the equation of capacitance gap is formulated, in which the harmonic oscillator deformation under acceleration is considered to form the basis of accurate modeling. Afterwards, the detection principles in working state for precession angle and amplitude of harmonic oscillator are described. Using eight vibratory sensors, three kinds of vibration detection schemes are proposed, and thus the numerical simulation system of HRG detection system is established. The simulation results show the relationship between the harmonic oscillator deformation under acceleration and the output errors in three vibration detection schemes, which can guide practical application of the proposed schemes. According to the simulation results, the proposed method can decrease the effect of acceleration on HRG by 10^-9 times, comparing with the current widely used vibration detection schemes. Thus, a vibration detection scheme which can isolate the effect of acceleration on HRG is found.