锚点耦合式双质量块音叉微机械陀螺的结构设计与振动分析

Design and vibration analysis of a micromachined tuning fork gyroscope with anchored coupling mechanism

设计了锚点耦合式双质量块音叉微机械陀螺,分析了结构的模态顺序与振动灵敏度特性。所设计的结构驱动方向采用反平行杠杆机制,检测方向使用四根线弹性梁连接的锚点耦合圆环梁,实现了驱动方向和检测方向模态顺序的优化,其检测方向的同相频率比反相频率提高了30%。建立了音叉式陀螺的二阶振动微分方程,利用坐标变换法得出锚点耦合式比传统耦合式结构的反相和同相振动输出分别降低了74.8%与88.0%,并进行了Ansys仿真分析验证。在不牺牲陀螺灵敏度的前提下,锚点耦合式双质量块音叉微机械陀螺能够很好地实现模态优化和大幅降低振动输出误差。

A micro-electro-mechanical system（ MEMS） tuning fork gyroscope（ TFG） with anchored coupling mechanism was designed and its mode ordering and vibration sensitivity were investigated. The proposed TFG prioritizes the anti-phase drive-mode using a levered mechanism while the sense-mode is prioritized using an anchored coupling ring spring linked by four linear beams to improve the mode ordering. The in-phase frequency of the anchored coupling TFG is improved by 30% than the anti-phase frequency in the sense direction. The second order vibration differential equation of the tuning fork gyroscope was established and solved by using the coordinate transformation method. The simulations and analytical results demonstrate that the vibration output is reduced by 74. 8 and 88. 0% in the anti-phase mode and inphase mode frequencies,respectively. The anchored coupling TFG can improve the mode ordering and greatly suppress the vibration output.