Ziegler-Nichols frequency response method for high-order adaptive optics system of the Advanced Technology Solar Telescope

摘要

We present the study and results on automatic tuning and optimizing the closed-loop control gains of theProportional Integral (PI) controller for the high-order adaptive optics (HOAO) system. The Ziegler-Nicholsfrequency response (ZNfr) method is examined using the Nyquist stability criterion to implement the automatictuning of PI controller by determining the ultimate gain, Ku, and ultimate period, Tu, of a process model, whichconsists of components from adaptive optics (AO) system. The maximum magnitude criterion, 0.5 dB 2.3,is identified and considered as the optimization method, which also established the stability of the PI controller.MATLAB scripts are developed to execute iterative calculation of control algorithm, which automates real-timesimulation of the Simulink high-order adaptive optics (Sim-HOAO) models. Simulink block diagrams are usedto represent transfer functions, which described the frequency-domain behavior of the AO system.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.