Combining global feedforward and glocal feedback control of large deformable mirrors
نویسندگان
چکیده
In this paper, a novel method for designing a model-based two-degree-of-freedom control structure for high speed position control of large deformable mirrors with voice coil actuators is presented. Both global feedforward and glocal (decentralized accounting for global dynamics) feedback control is included allowing for separately designing tracking performance and disturbance rejection. The model-based controller can be derived from either an analytical or a numerical dynamical model of the deformable mirror. The feedback controller is designed as a global linear quadratic regulator. By choosing the weighting matrices for the feedback controller in a specific way, the resulting global feedback law degenerates into multiple local feedback laws guaranteeing global stability. The local feedback laws only need limited information about surrounding actuators and comply with available computing power. As an example, a model-based two-degree-of-freedom control structure is derived for the Large Binoculare Telescope adaptive secondary mirror geometry with 672 actuators and sensors and simulation results are given.
منابع مشابه
Distributed Force Control of Deformable Mirrorsg
Large (>1 m) deformable mirrors are attractive for adaptive optics on ground-based telescopes; the mirrors typically have hundreds or thousands of actuators. The use of force actuators instead of position actuators has the potential to significantly reduce total system cost. However, the use of force actuators results in many lightly-damped structural resonances within the desired bandwidth of ...
متن کاملGenetic Feedforward-Feedback Controller for Functional Electrical Stimulation Control of Elbow Joint Angle
Background: Functional electrical stimulation (FES) is the most commonly used system for restoring functions after spinal cord injury (SCI). Objective: In this study we investigated feedback PID and feedforward-feedback P-PID controllers for regulating the elbow joint angle. Methods: The controllers were tuned based on a nonlinear muculoskeletal model containing two links, one joint with one de...
متن کاملFeedforward and Feedback Function of Selected Lower Limb Muscles Following Plyometric Exercises and Cryotherapy
Purpose: Despite the widespread use of cryotherapy in sports fields there is a lack of certain evidence of its impact of it on muscle activation especially following fatigue-induced exercise. This study aimed to assess the impact of cryotherapy alone and after plyometric exercises on knee muscle activation during the drop jump task. Method: 35 active female subjects (mean age of 22.74±2.10, m...
متن کاملMicroelectromechanical Deformable Mirrors - Selected Topics in Quantum Electronics, IEEE Journal on
A new class of silicon-based deformable mirrors is described. These devices are capable of correcting time-varying aberrations in imaging or beam forming applications. Each mirror is composed of a flexible silicon membrane supported by an underlying array of electrostatic parallel plate actuators. All structural and electronic elements were fabricated through conventional surface micromachining...
متن کاملA correction algorithm to simultaneously control dual deformable mirrors in a woofer-tweeter adaptive optics system
We present a direct slope-based correction algorithm to simultaneously control two deformable mirrors (DMs) in a woofer-tweeter adaptive optics system. A global response matrix was derived from the response matrices of each deformable mirror and the voltages for both deformable mirrors were calculated simultaneously. This control algorithm was tested and compared with a 2-step sequential contro...
متن کامل