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Open AccessArticle

Design and Mechanical Sensitivity Analysis of a MEMS Tuning Fork Gyroscope with an Anchored Leverage Mechanism

1
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
2
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China
3
Beijing Institute of Control and Electronic Technology, Beijing 100038, China
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(16), 3455; https://doi.org/10.3390/s19163455
Received: 28 May 2019 / Revised: 2 August 2019 / Accepted: 6 August 2019 / Published: 7 August 2019
(This article belongs to the Special Issue MEMS Sensors and Resonators)
This paper presents the design and analysis of a new micro-electro-mechanical system (MEMS) tuning fork gyroscope (TFG), which can effectively improve the mechanical sensitivity of the gyroscope sense-mode by the designed leverage mechanism. A micromachined TFG with an anchored leverage mechanism is designed. The dynamics and mechanical sensitivity of the design are theoretically analyzed. The improvement rate of mechanical sensitivity (IRMS) is introduced to represent the optimization effect of the new structure compared with the conventional one. The analytical solutions illustrate that the IRMS monotonically increases with increased stiffness ratio of the power arm (SRPA) but decreases with increased stiffness ratio of the resistance arm (SRRA). Therefore, three types of gyro structures with different stiffness ratios are designed. The mechanical sensitivities increased by 79.10%, 81.33% and 68.06% by theoretical calculation. Additionally, FEM simulation demonstrates that the mechanical sensitivity of the design is in accord with theoretical results. The linearity of design is analyzed, too. Consequently, the proposed new anchored leverage mechanism TFG offers a higher displacement output of sense mode to improve the mechanical sensitivity. View Full-Text
Keywords: mechanical sensitivity; tuning fork gyroscope; anchored leverage mechanism; stiffness ratio; coordinate transformation method mechanical sensitivity; tuning fork gyroscope; anchored leverage mechanism; stiffness ratio; coordinate transformation method
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MDPI and ACS Style

Li, Z.; Gao, S.; Jin, L.; Liu, H.; Guan, Y.; Peng, S. Design and Mechanical Sensitivity Analysis of a MEMS Tuning Fork Gyroscope with an Anchored Leverage Mechanism. Sensors 2019, 19, 3455.

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