基于摆偏角模型的摆式加速度计振动性能研究

Research on vibration performance of pendulous accelerometer based on pendulum deflection angle model

受到振动干扰时,摆式加速度计的摆片会出现相对原平衡位置的偏离,产生误差信号,是造成摆式加速度计在振动中精度降低的主要原因。为优化摆式加速度计的振动性能,分析了系统传递函数,建立了振动摆偏角的数学模型。对数学模型中的各项参数进行对比仿真,分析振动摆偏角随各项参数变化的频率特性,作为设计优化的依据。设计搭建测试系统,对2只配合不同校正网络参数的加速度计样本进行摆偏角对比测试和振动误差测试。实验结果表明:加速度计校正网络增益由2.80×105增大到5.20×10^5,对应样本摆偏角由16.85″减小到7.75″,振动误差由5.2×10-4 g减小到6.5×10-5 g。实验结果与理论模型和仿真结果相吻合,可以作为研究加速度计振动摆偏角特性和优化振动误差的方法。

Due to the vibration interference,the pendulous reed of the pendulous accelerometer will deviate from the original balance position and generate error signal,which is the main reason for the accuracy decreasing of the pendulous accelerometer.In order to optimize the performance of pendulous accelerometer in vibration,the transfer function of the system was analyzed and the mathematical model of the pendulum deflection angle in vibration was established.Various parameters in the mathematical model were compared and simulated,and the frequency characteristics of the pendulum deflection angle changing with the parameters in vibration were analyzed,which were used as the basis of design optimization.An experiment system was designed and built,which was used to perform the pendulum deflection angle comparison test and vibration error test of two accelerometer samples with different correction network parameters.The experiment results show that when the gain of the accelerometer correction network increases from 5.20×10^5 to 2.80×105,the pendulum deflection angle of the corresponding sample decreases from 16.85″to 7.75″,and the vibration error decreases from 5.2×10^-4 g to 6.5×10^-5 g.The experiment results are consistent with the theoretical model and simulation results,which can be used as a method to study the characteristics of the pendulum deflection angle and optimize the vibration error of the accelerometer.