Discrete Sliding Mode Control Based on Disturbance Observer and its Application on Flight Simulator Servo System

2006 ◽  
Author(s):  
Jinkun Liu ◽  
Liang Han
Keyword(s):  
Sliding Mode Control ◽  
Disturbance Observer ◽  
Sliding Mode ◽  
Servo System ◽  
Flight Simulator ◽  
Mode Control ◽  
Discrete Sliding Mode Control

scholarly journals Disturbance Observer-Based Discrete Sliding-Mode Control for a Marine Diesel Engine with Variable Sampling Control Technique

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Xuemin Li ◽  
Yufei Liu ◽  
Haoyu Shu ◽  
Runzhi Wang ◽  
Yunlong Yang ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Disturbance Observer ◽  
Engine Speed ◽  
Sliding Mode ◽  
Sampling Rate ◽  
Sliding Mode Controller ◽  
Mode Control ◽  
Variable Sampling ◽  
Marine Diesel ◽  
Discrete Sliding Mode Control

This paper proposes a disturbance observer-based discrete sliding-mode control scheme with the variable sampling rate control for the marine diesel engine speed control in the presence of system uncertainties and disturbances. Initially, a sliding-mode controller based on the fast power reaching law is employed, which has a good dynamic quality of the arrival stage and can suppress chattering. To satisfy the practical requirements in the digital controller and the crank angle-based fuel injection in engine speed control, the proposed method is discretized under the variable sampling rate condition. A disturbance observer based on the second-order sliding-mode control is designed to compensate the system uncertainties and disturbances, by doing such the requirement of the parameters of the sliding-mode controller to be reduced significantly. In addition, a cylinder-by-cylinder mean value engine model (MVEM) is built by restructuring the combustion torque model, based on which numerical simulations are carried out by comparing the proposed method with PID and the extended state observer (ESO)-based sliding mode controllers. The common operation situations of the marine diesel engines are taken into account, including starting process, acceleration and deceleration, load variation, and varied propulsion system parameters. The results demonstrate that the proposed disturbance observer-based sliding-mode controller has prominent control performance and strong robustness.

scholarly journals Divergent instability control of aeroelastic system driven by aerodynamic forces under disturbance based on discrete sliding mode control algorithms

2019 ◽  
Vol 52 (7-8) ◽  
pp. 1072-1083 ◽  
Author(s):  
Ting-Rui Liu
Keyword(s):  
Sliding Mode Control ◽  
Disturbance Observer ◽  
Sliding Mode ◽  
Control Algorithms ◽  
Control Input ◽  
Aerodynamic Forces ◽  
Mode Control ◽  
Blade Section ◽  
Instability Control ◽  
Discrete Sliding Mode Control

Divergent instability control of 2D pretwisted blade section of wind turbine driven by aerodynamic forces under disturbance is investigated. Realization of divergent instability control is based on two types of discrete sliding mode control algorithms. The structure is modeled as 2D pretwisted blade section integrated with structural damping, which is driven by aerodynamic model with perturbed disturbance. Discrete sliding mode control algorithm suitable for disturbance control is investigated to control divergent flap/lead-lag vibrations of blade section. To increase convergence performance and reduce the chattering phenomenon, discrete sliding mode control based on disturbance observer is applied. Convergence of disturbance observer is analyzed, and stability of closed-loop system is discussed. The simulation results show that not only the convergence accuracy can be improved by sliding mode control based on disturbance observer controller, but also the displacement chattering and the control input chattering can be effectively eliminated. Compared with conventional discrete sliding mode control, it has more advantages in the control of divergent instability. To facilitate the real-time realization and automation and at the same time to ensure accuracy, a design of quadratic feedback to build the performance control matrix in sliding mode control based on disturbance observer is developed in present study.

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