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环路参数对数字闭环加速度计动态特性影响

DOI: 10.13700/j.bh.1001-5965.2013.0301, PP. 455-460

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Abstract:

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.

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