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A Mode Matched Triaxial Vibratory Wheel Gyroscope with Fully Decoupled Structure.
Dunzhu Xia1, Lun Kong2, Haiyu Gao3
1School of Instrument Science and Engineering, Key Laboratory of Micro Inertial Instrument and Advanced Navigation Technology of the Ministry of Education, Southeast University, Nanjing 210096, China. xiadz_1999@163.com.
Sensors (Basel, Switzerland)
|November 24, 2015
Summary
This study introduces a novel silicon triaxial gyroscope with a rotary wheel to eliminate oscillations. The symmetrical design enhances sensitivity and suppresses mode coupling for accurate three-axis angular rate detection.
Area of Science:
- MEMS (Micro-Electro-Mechanical Systems)
- Inertial Sensing Technology
Background:
- Traditional triaxial linear gyroscopes suffer from oscillations due to unequal mass distribution.
- Coupling between drive and sense modes presents a significant challenge in gyroscope design.
Purpose of the Study:
- To present a modified silicon triaxial gyroscope with a rotary wheel to overcome oscillation issues.
- To design a perfectly symmetrical structure for enhanced sensitivity and suppressed mode coupling.
- To enable simultaneous, differential detection of three-axis angular rates.
Main Methods:
- A novel, symmetrical gyroscope structure (9.8 mm × 9.8 mm) with a rotary wheel was designed.
- Frequency tuning and feedback mechanisms were incorporated for post-processing adjustments.
- Artificial Fish Swarm Algorithm (AFSA) was used for mode matching, outperforming Particle Swarm Optimization (PSO).
- Finite Element Method (FEM) software (ANSYS) was employed for spring dimension adjustments.
Main Results:
- The designed gyroscope achieved a frequency split below 3 Hz.
- Simulated modal frequencies for drive and sense modes were 8001.1, 8002.6, 8002.8, and 8003.3 Hz.
- Analysis of cross-coupling effects and scale factors validated the design's feasibility.
Conclusions:
- The modified silicon triaxial gyroscope with a rotary wheel effectively suppresses oscillations.
- The symmetrical design and advanced algorithms ensure high sensitivity and accurate multi-axis rate detection.
- Simulation results confirm the practical viability of the proposed gyroscope design.
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