Variable structure control law for telescope pointing and tracking

1997 ◽  
Author(s):  
Dario Mancini ◽  
Massimo Brescia ◽  
Enrico Cascone ◽  
Pietro Schipani
Keyword(s):  
Variable Structure Control ◽  
Variable Structure ◽  
Control Law ◽  
Structure Control

scholarly journals Discrete time reaching law based variable structure control for fast reaching with reduced chattering

2020 ◽  
Vol 9 (1) ◽  
pp. 51
Author(s):  
Pournami Padmalatha ◽  
Susy Thomas
Keyword(s):  
Discrete Time ◽  
Sliding Mode ◽  
Variable Structure Control ◽  
Variable Structure ◽  
The Other ◽  
Control Law ◽  
Sliding Surface ◽  
Structure Control ◽  
Reaching Law ◽  
Speed Up

In this paper, a variable structure control law is proposed for discrete time sliding mode control so as to reduce both reaching time and quasi sliding mode band reduction. This new law is composed of two different sliding variable dynamics; one to achieve fast reaching and the other to counter its effect on widening the quasi sliding mode band. This is accomplished<br />by introducing a boundary layer around the sliding surface about which the transformation of the sliding variable dynamics takes place. This provides the flexibility to choose the initial dynamics in such a way as to speed up the reaching phase and then at the boundary transform this dynamics to one that reduces the quasi sliding mode band. Thus, the law effectively<br />coalesces the advantageous traits of hitherto proposed reaching laws that succeed in either the reduction of reaching phase or the elimination of quasi sliding mode band. The effectiveness of the proposed reaching law is validated through simulations.<br /><br />

scholarly journals Output Feedback Variable Structure Control Design for Uncertain Nonlinear Lipschitz Systems

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Jeang-Lin Chang ◽  
Tsui-Chou Wu
Keyword(s):  
Output Feedback ◽  
Control Design ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Control Law ◽  
Sufficient Condition ◽  
Structure Control ◽  
Control Scheme ◽  
Simulation Results ◽  
Lipschitz Systems

This paper develops a full-order compensator-based output feedback variable structure control law for uncertain nonlinear Lipschitz systems having matched perturbations. Given that the sufficient condition is satisfied, the developed control scheme, with the observer-like technique incorporated into the design of the compensator, can achieve global exponential stabilization. An illustrative example is provided with simulation results to show the effectiveness of the proposed method.

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