全对称振动陀螺的结构设计与参数优化分析

Structure Design and Structural Parameter Optimization of Fully Symmetric Vibratory Gyroscope

针对振动陀螺的高性能和微型化发展趋势,研制了一种新型的全对称振动陀螺。依据振动陀螺工作原理,并采用压电驱动和压电检测的工作方式,建立了全对称振动陀螺整体的结构模型,通过有限元方法,进行了模态分析,找到了压电片、横梁结构参数及中心质量柱对陀螺模态频率的影响规律,得到了优化的结构参数(横梁:9 mm×2 mm×0.5 mm;中心质量柱4 mm×4mm×10 mm),并完成了样机制作和试验验证。结果表明:振动陀螺的模态频率随着横梁的长、宽、厚和中心质量柱的高均有规律变化,当材料一定时,可以通过改变陀螺的结构参数达到模态匹配的效果。该陀螺的工作原理和结构设计是合理可行的,具有较好的应用前景。研究工作对其他固态振动陀螺的结构设计和参数优化提供了参考。

For the trends of vibratory gyroscope＇s high-performance and miniaturization, a fully symmetric vibratory gyroscope was developed. According to the working principle, using the way of piezoelectric driving and detecting, the total structure design of this gyroscope was established. The number of piezoelectric patches, the structural parameters of the spoke, and the central post had effect on inherent frequency of vibratory gyroscope, and the effect was analyzed by FEM simulation. Then optimized structural pa- rameters （spoke size：9 mm ×2 mm ×0.5 mm;central post size：4 mm ×4 mm × 10 mm） were obtained. The prototype was fabrica- ted and tested. The results show that structural parameter has vital effect on inherent frequency. The inherent frequency regularly changes with the number of piezoelectric patches ,the length ,width and thickness of the spoke, and the height of the central post. And it shows the validity of the working principle and the design. This fully symmetric vibratory has a promising prospect. The re- search provides a basis for structure design and optimization of solid vibratory gyroscope.