Design, Analysis, and Simulation of a MEMS Tuning Fork Gyroscope with a Mechanical Amplification Structure

Area of Science:

• Micro-electro-mechanical systems (MEMS)
• Mechanical Engineering
• Sensor Technology

Background:

• Tuning fork gyroscopes (TFGs) are crucial for inertial navigation and motion sensing.
• Enhancing the mechanical sensitivity of MEMS TFGs is essential for improved performance.
• Existing MEMS TFG designs face limitations in sensitivity amplification without compromising footprint.

Purpose of the Study:

• To introduce a novel MEMS TFG design incorporating a chevron-shaped displacement mechanism.
• To amplify Coriolis-force-induced displacement for increased mechanical sensitivity.
• To evaluate the proposed design's effectiveness through theoretical modeling and finite element analysis.

Main Methods:

• Development of a novel MEMS TFG architecture featuring a chevron displacement amplification mechanism.
• Theoretical modeling to predict the gyroscope's performance characteristics.
• Finite Element Analysis (FEA) to simulate and validate the mechanical behavior and displacement amplification.
• Comparative analysis with a conventional TFG design of similar dimensions.

Main Results:

• The proposed MEMS TFG design demonstrated an output displacement approximately 2.5 times greater than a conventional TFG.
• Theoretical modeling and FEA results showed high agreement, validating the amplification mechanism's effectiveness.
• The chevron mechanism significantly enhances the mechanical sensitivity of the TFG.
• The amplification was achieved without an increase in the device's footprint.

Conclusions:

• The novel MEMS TFG design with a chevron displacement mechanism offers a substantial improvement in mechanical sensitivity.
• This design provides a viable method for enhancing gyroscope performance without scaling up device size.
• The validated approach holds promise for developing more sensitive and compact MEMS gyroscopes.