The Synthesis Model of Flat-Electrode Hemispherical Resonator Gyro

Area of Science:

• Mechanical Engineering
• Aerospace Engineering
• Sensor Technology

Background:

• Hemispherical Resonator Gyros (HRGs) are crucial for deep space exploration.
• Traditional HRG models present challenges in parameter acquisition.
• Flat-electrode HRGs offer a simpler, more manufacturable design.

Purpose of the Study:

• To establish a reliable model for flat-electrode Hemispherical Resonator Gyros (HRGs).
• To develop methods for identifying assembly errors and key parameters.
• To enable a comprehensive simulation model for HRG control and detection.

Main Methods:

• Equivalent mechanical modeling and deduction of motion equations for the hemispherical shell resonator.
• Establishment of excitation and detection models based on flat-electrode capacitor principles.
• Development of an identification method for assembly errors and parameters using capacitance measurements.

Main Results:

• The derived HRG model and its parameters were validated against finite element simulations and experimental data.
• Input/output characteristics were accurately represented as voltage changes.
• Methods for identifying average gap, inclination, and direction angles were successfully demonstrated.

Conclusions:

• A robust theoretical model for flat-electrode HRGs has been established.
• The developed identification methods allow for performance evaluation and optimization.
• This work facilitates the creation of advanced simulation models for HRG control systems.