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Model reference adaptive sliding mode control of a laser beam for jitter correction

Samantaray, S and Padhi, R (2017) Model reference adaptive sliding mode control of a laser beam for jitter correction. In: 25th AIAA/AHS Adaptive Structures Conference, 9 - 13 January 2017, Grapevine, Texas.

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Official URL: https://dx.doi.org/10.2514/6.2017-1440


In this paper, a model reference adaptive sliding mode control is designed to improve the robustness of a fast steering mirror (FSM) which is used to track the reference signal in the presence of jitter. The FSM steers the deviated beam to the desired target. Here, sliding mode control is implemented which operates under nominal conditions. Due to ageing, it leads to parametric matched uncertainties of the FSM model. It deteriorates the performance of the nominal sliding mode control. Hence, an adaptive controller is designed to retain the desired performance in tracking the reference signal. A reference model is designed using dynamic inversion. Further, an adaptive sliding mode controller (with proportional-integral sliding surface) is designed and implemented on the perturbed system such that it negates the effects of uncertainties to improve the overall tracking performance. This makes the actual (perturbed) model follow the reference model. The proportionalintegral sliding surface proves out to be more robust towards parameter uncertainties. Moreover, the reference signal is filtered with FSM’s actuator bandwidth as the cut-off frequency of the low pass filter so that it carries the utmost frequency component that can be tracked by FSM. A comparative study has been done between nominal and model reference adaptive sliding mode control. Their performances are tabulated in detail and concluded with appropriate observations from simulation results.

Item Type: Conference Paper
Publication: 25th AIAA/AHS Adaptive Structures Conference, 2017
Publisher: American Institute of Aeronautics and Astronautics Inc, AIAA
Additional Information: cited By 1; Conference of 25th AIAA/AHS Adaptive Structures Conference, 2017 ; Conference Date: 9 January 2017 Through 13 January 2017; Conference Code:190169
Keywords: Controllers; Jitter; Laser beams; Low pass filters; Sliding mode control; Two term control systems, Adaptive controllers; Adaptive sliding mode controller; Fast steering mirror; Frequency components; Model reference adaptive; Parameter uncertainty; Proportional-integral sliding surfaces; Tracking performance, Model reference adaptive control
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 25 Sep 2020 07:39
Last Modified: 25 Sep 2020 07:39
URI: http://eprints.iisc.ac.in/id/eprint/65681

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