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数字闭环石英挠性加速度计在纯积分控制器下带宽仅有10Hz左右,需要通过调整伺服电路结构参数来改善系统动态性能.针对这一问题,且为保证系统的无差性,设计了位置式比例积分控制器.建立闭环系统数学模型,利用隐函数求解的方法,得到了环路参数(包括采样点数、比例系数及积分系数)与系统闭环带宽的关系,同时分析了环路参数对系统稳定性及静态精度的影响.搭建系统实验样机并进行闭环带宽及零偏稳定性测试.结果表明,闭环系统带宽与环路参数成正相关关系,其中改变比例系数对系统动态特性的影响最为显著.实验结果与理论分析一致,为数字闭环加速度计动态特性调整提供理论依据及实验指导.
Digital closed-loop quartz flexible accelerometer in the pure integral controller bandwidth of only about 10Hz, the need to adjust the servo circuit structure parameters to improve the system dynamic performance.In response to this problem, and in order to ensure the system of no difference, the design of the position type Proportional-integral controller is used to establish the mathematical model of the closed-loop system. By using the method of implicit function, the relationship between the loop parameters (including sampling points, proportional coefficients and integral coefficients) and the closed-loop bandwidth of the system is obtained. Static and static accuracy.The experimental prototype of the system was built and the closed-loop bandwidth and the bias stability test were carried out.The results show that the bandwidth of the closed-loop system has a positive correlation with the loop parameters, and the change of the ratio coefficient has the most significant impact on the dynamic performance of the system. The results are consistent with the theoretical analysis, which provides theoretical basis and experimental guidance for adjusting the dynamic characteristics of digital closed-loop accelerometer.