Fuzzy disturbance observer-based modified variable gains super-twisting sliding mode composite control for a two-axis airborne optoelectronic stabilized platform

Optik ◽  
2021 ◽  
Vol 228 ◽  
pp. 166132
Author(s):  
Qingli Shi ◽  
Hua Wang ◽  
Hao Cheng ◽  
Menglong Wang ◽  
Feng Cheng ◽  
...  
Keyword(s):  
Disturbance Observer ◽  
Sliding Mode ◽  
Composite Control ◽  
Stabilized Platform ◽  
Fuzzy Disturbance Observer

scholarly journals Design of Composite Disturbance Observer and Continuous Terminal Sliding Mode Control for Piezoelectric Nanopositioning Stage

Electronics ◽  
2021 ◽  
Vol 10 (18) ◽  
pp. 2242
Author(s):  
Pengyu Qiao ◽  
Jun Yang ◽  
Chen Dai ◽  
Xi Xiao
Keyword(s):  
Sliding Mode Control ◽  
Control Strategy ◽  
Disturbance Observer ◽  
Sliding Mode ◽  
Accurate Estimation ◽  
Terminal Sliding Mode Control ◽  
External Disturbances ◽  
Terminal Sliding Mode ◽  
Composite Control ◽  
Mode Control

The nonlinearities of piezoelectric actuators and external disturbances of the piezoelectric nanopositioning stage impose great, undesirable influences on the positioning accuracy of nanopositioning stage systems. This paper considers nonlinearities and external disturbances as a lumped disturbance and designs a composite control strategy for the piezoelectric nanopositioning stage to realize ultra-high precision motion control. The proposed strategy contains a composite disturbance observer and a continuous terminal sliding mode controller. The composite disturbance observer can estimate both periodic and aperiodic disturbances so that the composite control strategy can deal with the disturbances with high accuracy. Meanwhile, the continuous terminal sliding mode control is employed to eliminate the chattering phenomenon and speed up the convergence rate. The simulation and experiment results show that the composite control strategy achieves accurate estimation of different forms of disturbances and excellent tracking performance.

Design of sliding-mode control based on fuzzy disturbance observer for minimization of switching gain and chattering

2014 ◽  
Vol 19 (4) ◽  
pp. 851-858 ◽  
Author(s):  
Hyo-Seok Kang ◽  
Yongho Lee ◽  
Chang-Ho Hyun ◽  
Heejin Lee ◽  
Mignon Park
Keyword(s):  
Sliding Mode Control ◽  
Disturbance Observer ◽  
Sliding Mode ◽  
Mode Control ◽  
Fuzzy Disturbance Observer

An Intelligence Sliding Mode Controller Based on Nonlinear Disturbance Observer for Rotary Steering Drilling Stabilized Platform

2013 ◽  
Vol 341-342 ◽  
pp. 913-919
Author(s):  
Yuan Tao Zhang ◽  
Jun Yi
Keyword(s):  
Disturbance Observer ◽  
Sliding Mode ◽  
Design Parameters ◽  
Sliding Mode Controller ◽  
Sigmoid Function ◽  
Nonlinear Disturbance Observer ◽  
Function Coefficient ◽  
Nonlinear Disturbance ◽  
Stabilized Platform ◽  
Uncertain Disturbance

An intelligence sliding mode controller for rotary steering drilling stabilized platform based on nonlinear disturbance observer is presented. Nonlinear disturbance observer which can converge exponentially with suitable design parameters is used to obs erve the uncertain disturbance of stabilized platform under work condition. Sliding mode controller is designed to guarantee the robustness of the closed-loop system. The adaptive rate of switching gain is designed and sign function is replaced by bipolar sigmoid function to weaken chattering. Finally, genetic algorithm is applied to search the optimal controller parameters, including switching function coefficient, switching gain adaptive coefficient, sigmoid function coefficient and observer coefficient. Simulation results show that nonlinear disturbance observer can observe the uncertain disturbance effectively, controller output is decreased and stabilized platform can get optimal control performance and robustness.

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