Second-order sliding mode output feedback controller with adaptation

2016 ◽  
Vol 30 (8-10) ◽  
pp. 1523-1543 ◽  
Author(s):  
Daniel Y. Negrete-Chávez ◽  
Jaime A. Moreno
Keyword(s):  
Output Feedback ◽  
Sliding Mode ◽  
Second Order ◽  
Feedback Controller ◽  
Output Feedback Controller ◽  
Second Order Sliding Mode

scholarly journals Finite-Time Output Feedback Controller Based on Observer for the Time-Varying Delayed Systems: A Moore-Penrose Inverse Approach

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Cong-Trang Nguyen ◽  
Yao-Wen Tsai
Keyword(s):  
Asymptotic Stability ◽  
Output Feedback ◽  
Finite Time ◽  
Sliding Mode ◽  
Feedback Controller ◽  
Delay Systems ◽  
Linear Matrix ◽  
Invariance Property ◽  
Time Varying ◽  
Output Feedback Controller

This study proposes a novel variable structure control (VSC) for the mismatched uncertain systems with unknown time-varying delay. The novel VSC includes the finite-time convergence sliding mode, invariance property, asymptotic stability, and measured output only. A necessary and sufficient condition guaranteeing the existence of sliding surface is given. A novel lemma is established to deal with the control design problem for a wider class of time-delay systems. A suitable reduced-order observer (ROO) is constructed to estimate unmeasured state variables of the systems. A novel finite-time output feedback controller (FTOFC) is investigated, which is based on the ROO tool and the Moore-Penrose inverse technique. Moreover, with the help of this lemma and the proposed FTOFC, restrictions on most existing works are also eliminated. In addition, an asymptotic stability analysis is implemented by means of the feasibility of the linear matrix inequalities (LMIs) and given desirable sliding mode dynamics. Finally, a MATLAB simulation result on a numerical example is performed to show the effectiveness and advantage of the proposed method.

scholarly journals High Order Sliding Mode Observer-Based Output Feedback Controller Design For Electro-Hydraulic System

2017 ◽  
Vol 12 (4) ◽  
pp. 1-11
Author(s):  
Shibly Ahmed AL-Samarraie ◽  
Mustafa H. Mishary
Keyword(s):  
Output Feedback ◽  
Hydraulic System ◽  
Sliding Mode ◽  
High Order ◽  
Feedback Controller ◽  
Sliding Mode Observer ◽  
Control Effort ◽  
Output Feedback Controller ◽  
Perturbation Term ◽  
Piston Position

A perturbed linear system with property of strong observability ensures that there is a sliding mode observer to estimate the unknown form inputs together with states estimation. In the case of the electro-hydraulic system with piston position measured output, the above property is not met. In this paper, the output and its derivatives estimation were used to build a dynamic structure that satisfy the condition of strongly observable. A high order sliding mode observer (HOSMO) was used to estimate both the resulting unknown perturbation term and the output derivatives. Thereafter with one signal from the whole system (piton position), the piston position make tracking to desire one with a simple linear output feedback controller after canceling the perturbation term. The numerical simulation results showed excellent performance of the proposed output feedback controller in forcing the piston position to follow the desired reference position. Moreover, the control effort spent was minimal.

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