铍铝合金在提高光纤陀螺动态性能方面的应用

Applications of Be-Al alloy for improvement of FOG vibration performance

光纤陀螺在应用环境确定的振动条件下保持输出精度是光纤陀螺工程化的必然要求,结构材料的选择直接影响输出精度。从陀螺结构的振动性能理论分析出发,将铍铝合金材料应用在轻小型光纤陀螺的关键结构设计中,通过建立有限元模型并仿真铍铝合金结构陀螺的振动性能,陀螺可满足谐振点大于2 k Hz的要求。加工、装配了铍铝结构实验样机(精度要求0.1(°)/h)并进行了多次10 Hz^2 k Hz正弦扫频振动实验。扫频过程中振动传感器未检测到结构的谐振,陀螺输出零位偏置变化0.04(°)/h,噪声水平与振动前后相当。结果表明铍铝合金材料优良的特性满足轻小型光纤陀螺振动性能要求,在严格重量约束下能降低结构设计难度,符合航空航天领域对惯性仪表质量苛刻的要求。

Under the condition of dynamical vibration in determinate application environments,it is an inevitable requirement of engineering for FOG to retain its output precision,and choosing suitable materials for the structure of FOG is one of the key technologies. Based on the theory of FOG＇s structural vibration performance,beryllium aluminum alloy is introduced in the key structure of the small and light FOG,and the FOG＇s finite element model is used to implement the simulation. Simulation results show that the FOG＇s resonance is greater than 2 k Hz. An experimental FOG prototype（accuracy 0.1°/h） with beryllium aluminum alloy structure is used in sine sweep vibration experiments（frequency from 10 Hz to 2 k Hz）. There are no resonances,and the FOG＇s zero bias variation is 0.04（°）/h. The noise level remains almost the same. The results show that the excellent properties of beryllium aluminum alloy meet the vibration performance requirements of light and small FOG,and can decrease the difficulty of structural design under strict weight constraints,especially satisfying the demanding requirements of the inertial instrument＇s quality in the field of aerospace.