Li Hongyin, Bai Yanzheng, Hu Ming, Luo Yingxin, Zhou Zebing
MOE Key Laboratory of Fundamental Quantities Measurement, School of Physics, Huazhong University of Science and Technology (HUST), Wuhan 430074, China.
School of Automation, Huazhong University of Science and Technology (HUST), Wuhan 430074, China.
Sensors (Basel). 2016 Dec 23;17(1):21. doi: 10.3390/s17010021.
The state-of-the-art accelerometer technology has been widely applied in space missions. The performance of the next generation accelerometer in future geodesic satellites is pushed to 8 × 10 - 13 m / s 2 / H z 1 / 2 , which is close to the hardware fundamental limit. According to the instrument noise budget, the geodesic test mass must be kept in the center of the accelerometer within the bounds of 56 pm / Hz 1 / 2 by the feedback controller. The unprecedented control requirements and necessity for the integration of calibration functions calls for a new type of control scheme with more flexibility and robustness. A novel digital controller design for the next generation electrostatic accelerometers based on disturbance observation and rejection with the well-studied Embedded Model Control (EMC) methodology is presented. The parameters are optimized automatically using a non-smooth optimization toolbox and setting a weighted H-infinity norm as the target. The precise frequency performance requirement of the accelerometer is well met during the batch auto-tuning, and a series of controllers for multiple working modes is generated. Simulation results show that the novel controller could obtain not only better disturbance rejection performance than the traditional Proportional Integral Derivative (PID) controllers, but also new instrument functions, including: easier tuning procedure, separation of measurement and control bandwidth and smooth control parameter switching.
最先进的加速度计技术已广泛应用于太空任务。未来测地卫星中下一代加速度计的性能被提升至8×10⁻¹³米/秒²/赫兹¹/²，这已接近硬件基本极限。根据仪器噪声预算，反馈控制器必须将测地测试质量块保持在加速度计中心，偏差范围在56皮米/赫兹¹/²以内。前所未有的控制要求以及集成校准功能的必要性，需要一种更具灵活性和鲁棒性的新型控制方案。本文提出了一种基于干扰观测与抑制的新型数字控制器设计，用于下一代静电加速度计，采用了经过充分研究的嵌入式模型控制（EMC）方法。使用非光滑优化工具箱并将加权H无穷范数作为目标自动优化参数。在批量自动调谐过程中，加速度计精确的频率性能要求得到了很好的满足，并生成了一系列适用于多种工作模式的控制器。仿真结果表明，新型控制器不仅能获得比传统比例积分微分（PID）控制器更好的干扰抑制性能，还具备新的仪器功能。这些功能包括：调谐过程更简便、测量带宽与控制带宽分离以及控制参数切换平稳。
