Structural finite element analysis of path length control mirror forlaser gyroscopes
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摘要: 为研究激光陀螺腔长控制反射镜结构参数对其性能影响，提出了建立腔长控制镜弹性、压电体耦合有限元模型并进行直接耦合场有限元分析的方法。通过编制ANSYS有限元软件宏文件，实现有限元模型与结构尺寸的自动同步。对某型激光陀螺腔长控制镜仿真计算表明，反射镜环槽内外径以及变形筋的厚度对其光程调节能力影响最大，并在此基础上实现了该型控制镜的优化设计。实验表明该方法对激光陀螺腔长控制镜的结构设计具有一定的指导意义。Abstract: To study the relationship between structural parameters of ring laser gyro (RLG) path length control mirrors and its performance, a method was presented in which finite element (FE) model including elastic and piezoelectric body was established and direct coupled field analysis was conducted. By programming an ANSYS macro file, automatic synchronization between FE model and the structure size was achieved. Simulation results of a specific path length control mirrors indicate that the annular groove inner and outer diameters, and the deformable rib thickness of the mirror have the greatest impact on the light path length adjustment capability. The results are used to optimize the design. Experiments demonstrate that the method is of significance in the path length control mirror design.
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