An indirect Lyapunov approach of stability of fractional order linear system with and without time delay

2017 ◽  
Author(s):  
Keyong Shao ◽  
Xiaofeng Gu ◽  
Feng Han ◽  
Guangyuan Yang ◽  
Wang Gao ◽  
...  
Keyword(s):  
Time Delay ◽  
Linear System ◽  
Fractional Order ◽  
Order Linear ◽  
Lyapunov Approach

Fractional-Order Optimal Control of Fractional-Order Linear Vibration Systems with Time Delay

2018 ◽  
Vol 7 (3) ◽  
pp. 72-93
Author(s):  
Saeed Balochian ◽  
Nahid Rajaee
Keyword(s):  
Optimal Control ◽  
Time Delay ◽  
Fractional Order ◽  
Control Method ◽  
Linear Structure ◽  
Control Input ◽  
Linear Vibration ◽  
Order Linear ◽  
Input Control ◽  
Delayed System

Vibration control of fractional-order linear systems in the presence of time delays has been dealt in this article. Considering a delayed n-degree-of freedom linear structure that is modeled by fractional order equations, a fractional-order optimal control is provided to minimize both control input and output of delayed system via quadratic objective function. To do this, first the fractional order model of system that is subject to time delay is rewritten into a non-delay form through a particular transformation. Then, a fractional order optimal controller is provided using the classical optimal control theory to find an optimal input control. A delayed viscose system is then presented as a practical worked-out example. Numerical simulation results are given to confirm the efficiency of the proposed control method.

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