环路参数对数字闭环加速度计动态特性影响

数字闭环石英挠性加速度计在纯积分控制器下带宽仅有10 Hz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.

Loop parameters on dynamic characteristics of digital closed-loop accelerometer

The bandwidth of the digital closed-loop quartz-flex accelerometer was only 10 Hz under the integral controller. The servo loop parameters were adjusted to improve the system dynamic performance, and a proportional integral controller was designed to ensure that the system was no difference. The system mathematical model was established. With the method of implicit function, the influences of the loop parameters (including sampling coefficient, proportional coefficient and integral coefficient) on the closed-loop bandwidth, stability and static accuracy were analyzed. To build the system prototype, experimental results of the bandwidth and zero bias stability show that the system bandwidth is positively correlated with the loop parameters, among which proportional coefficient is the most significant factor on the dynamic characteristics of the system. Test results are in consistence with the theoretical analysis, which provides the theoretical basis and experimental instruction for dynamic characteristics adjustment of the digital closed-loop accelerometer.