Loop parameters on dynamic characteristics of digital closed-loop accelerometer
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摘要: 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.Abstract: 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.
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Key words:
- accelerometer /
- digital closed-loop /
- dynamic characteristics /
- stability /
- bandwidth
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[1] 顾英.惯性加速度计技术综述[J].飞航导弹, 2001, 18(6):78-85 Gu Ying.Inertial navigation accelerometer technology summary[J].Navigation Missile, 2001, 18(6):78-85(in Chinese) [2] Foote S A, Grindeland D B.Model QA3000 Q-flex accelerometer high performance test results[J].Aerospace and Electronic Systems Magazine, 1992, 7(6):59-67 [3] 张春熹, 魏渊, 张晞, 等.数字闭环加速度计系统模型分析与校正设计[J].仪器仪表学报, 2012, 33(12):2833-2839 Zhang Chunxi, Wei Yuan, Zhang Xi, et al.Model analysis and emendation design of digital close-loop accelerometer system[J].Chinese Journal of Scientific Instrument, 2012, 33(12):2833-2839(in Chinese) [4] Li L, Zhang C X, Zhang X, et al.Investigation on noise of digital close-loop Q-flex accelerometer[C]//Proceedings of the 2011 6th IEEE Conference on Industrial Electronics and Applications.Piscataway, NJ:IEEE, 2011:614-619 [5] Verma P, Gopal R, Arya S K.Dynamic characteristics of vibratory gyro-accelerometer[C]//Proceedings of the 2012 5th International Conference on Computers and Devices for Communication.Washington, DC:IEEE Computer Society, 2012:1-4 [6] 徐淑静, 杨拥军.MEMS电容式加速度计的动态特性分析[J].微纳电子技术, 2011, 48(5):321-325 Xu Shujing, Yang Yongjun.Dynamic characteristics analysis of MEMS capacitive accelerometer[J].Micronanoelectronic Technology, 2011, 48(5):321-325(in Chinese) [7] Feng Z C, Fan M X, Chellaboina V.Adaptive input estimation methods for improving the bandwidth of microgyroscopes[J].Sensors Journal, 2007, 7(4):562-567 [8] 魏渊.数字闭环石英挠性加速度计系统设计与实现[D].北京:北京航空航天大学, 2012 Wei Yuan.Design and realization of digital close-loop quartz flex accelerometer system[D].Beijing:Beijing University of Aeronautics and Astronautics, 2012(in Chinese) [9] 宋星, 房建成, 盛蔚.电容式微加速度计闭环检测电路[J].北京航空航天大学学报, 2009, 35(3):384-388 Song Xing, Fang Jiancheng, Sheng Wei.Circuit for close-loop capacitive micro-accelerometers[J].Journal of Beijing University of Aeronautics and Astronautics, 2009, 35(3):384-388(in Chinese) [10] Labibi B, Marquez H J, Chen T W.Decentralized robust PI controller design for an industrial boiler[J].Journal of Process Control, 2009, 19(2):216-230 [11] 高金源, 夏洁.计算机控制系统[M].北京:清华大学出版社, 2007 Gao Jinyuan, Xia Jie.Computer control system[M].Beijing:Tsinghua University Press, 2007(in Chinese) [12] 戚玉婕, 车录峰, 孙腾, 等.反馈补偿对高Q值加速度计动态性能的影响[J].半导体技术, 2011, 36(1):26-30 Qi Yujie, Che Lufeng, Sun Teng, et al.Influence of feedback compensation on dynamic property for high-Q capacitive accelerometers[J].Semiconductor Technology, 2011, 36(1):26-30(in Chinese) [13] Tian W, Wu S C, Zhou Z B, et al.High resolution space quartz-flexure accelerometer based on capacitive sensing and electrostatic control technology[J].Review of Scientific Instruments, 2012, 83(9):095002-1-6 [14] GJB 1037A—2004 单轴摆式伺服线加速度计试验方法[S] GJB 1037A—2004 Test methods for single-axis pendulous servo linear accelerometers[S](in Chinese)
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