杯形波动陀螺振型偏移角快速辨识方法

A fast identification method for mode offset angle of cupped wave gyroscope

振型偏移角辨识是杯形波动陀螺平衡调节工序的关键步骤。在研究了杯形波动陀螺振型分布与压电电极信号输出关系的基础上,根据陀螺两阶相邻工作模态下其固有轴系分布相差45°的特点,提出了一种基于压电电极输出信号检测的杯形波动陀螺振型偏移角快速辨识方法,该方法可消除杯形波动陀螺压电电极振动传递效率差异对振型测试带来的影响,准确辨识出振型偏移角度,同时可计算出各压电电极振动传递效率的比例关系。采用该方法对杯形波动陀螺原理样机进行振型偏移角辨识,并将辨识结果与激光测振仪对样机的振型测试数据进行比较,结果表明该方法电路实现简单,耗时短,计算准确,可有效提高振型偏移角的辨识效率。研究工作可为杯形波动陀螺平衡调节和测控电路设计提供参考。

The mode offset angle identification is a key step of the balance process of the cupped wave gyroscope. The relationship of vibration mode shape and output signal of the piezoelectric electrodes in cupped wave gyroscope are studied, andaccording to the feature that the angle between the inherent axes of the two neighboring work modes is 45°, a fast identification method for mode offset angle of cupped wave gyroscope based on output signal detection of the piezoelectric electrodes on resonator is put forward. By this method, the negative effect on vibration mode test caused by difference of vibration transfer efficiency of each piezoelectric electrode can be eliminated, the mode offset angle can be identified accurately, and the proportion between each piezoelectric electrode＇s vibration transfer efficiency can be worked out. The mode offset angle of the cupped wave gyroscope prototype is identified by using the fast method, and the result is compared with the mode shape test data from laser Doppler vibrometer. The result of the experiment proves that the fast method has following advantages： simple circuit, low time-cost, accurately calculation and high identification efficiency of mode offset angle. The research workprovides reference for the balance process and control circuit design of the cupped wave gyroscope.