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Proceedings Paper

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

We present the study and results on automatic tuning and optimizing the closed-loop control gains of the Proportional Integral (PI) controller for the high-order adaptive optics (HOAO) system. The Ziegler-Nichols frequency response (ZNfr) method is examined using the Nyquist stability criterion to implement the automatic tuning of PI controller by determining the ultimate gain, Ku, and ultimate period, Tu, of a process model, which consists 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-time simulation of the Simulink high-order adaptive optics (Sim-HOAO) models. Simulink block diagrams are used to represent transfer functions, which described the frequency-domain behavior of the AO system.

Paper Details

Date Published: 27 September 2012
PDF: 13 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 844769 (27 September 2012); doi: 10.1117/12.927169
Show Author Affiliations
Joseph Curamen, M3 Engineering and Technology (United States)
National Solar Observatory (United States)
Luke Johnson, National Solar Observatory (United States)
Thomas Rimmele, National Solar Observatory (United States)

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)

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