Sliding mode of generalized bilinear proportion-differentiation variable structure control system

2002 ◽  
Author(s):  
Guo Tianshi
Keyword(s):  
Control System ◽  
Sliding Mode ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Structure Control

Variable Structure Control of the Brushless DC Motor

2011 ◽  
Vol 345 ◽  
pp. 79-82
Author(s):  
Xu Gang Wang ◽  
Xin Hua Li
Keyword(s):  
Control System ◽  
Sliding Mode ◽  
Tracking Error ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Brushless Dc Motors ◽  
Structure Control ◽  
Brushless Dc ◽  
Dc Motors ◽  
Result Show

In order to increase the degree of the angular velocity tracking precision of the brushless DC motors control system, the controller is designed using the variable structure control with sliding mode. The mathematical model of the brushless DC motors is built. The sliding mode function includes tracking error and the differential coefficient of the tracking error. In order to alleviate the chattering, the saturation function replaces the sign function. The simulation result show the tracking precision is high and the controller output has not obvious chattering. The controller meets the tracking precision of he brushless DC motors control system.

Application Analysis of the Fuel Viscosity and Temperature Control System Based on the Sliding Mode Theory

2012 ◽  
Vol 503-504 ◽  
pp. 1116-1119
Author(s):  
Zhuan Zhao Liu ◽  
De Shang Chang ◽  
Xin Jian Liu
Keyword(s):  
Control System ◽  
Temperature Control ◽  
Sliding Mode ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Fuel Oil ◽  
Temperature Control System ◽  
Structure Control ◽  
Heat Transfer Theory ◽  
Sliding Mode Variable Structure

With the shortage of the petroleum resources day by day, the fuel oil price is becoming higher and higher. The ship companies want to use the heavy diesel oil and inferior fuel with lower price for the marine diesel. Temperature is a variable with great inertia. Using the PID control algorithm, which will lead to the consequence of over correction in the controlling process, the advantage of sliding mode variable structure control is the small over correction. In this paper, based on thermodynamics and heat transfer theory, the mathematical model of temperature control system is built, the sliding mode movement equation and the sliding mode variable structure controller is obtained. This makes the application of temperature control take the advantage of sliding mode variable structure control.

RLV Attitude Control System Design in Reentry Flight Phase

2011 ◽  
Vol 383-390 ◽  
pp. 5548-5552
Author(s):  
Peng Fei Ji
Keyword(s):  
Control System ◽  
Attitude Control ◽  
Sliding Mode ◽  
Dynamic Pressure ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Control Technique ◽  
Nonlinear Simulation ◽  
Flight Phase ◽  
Structure Control

In reentry flight phase of reusable launch vehicle (RLV), its aerodynamic characters alter sharply, going with serious uncertainties and nonlinearities. These factors make the reentry attitude control technique be one of key technique for RLV. In this paper, the sliding mode variable structure control technique is used for reentry attitude control. A specific switch function is defined; a specific exponential reaching law and continuous analogy of sign function are chosen to weaken the chattering brought by the variable structure control technique. RLV is equipped with aerosurfaces and reaction control system (RCS), the arithmetic based on dynamic pressure change is presented. Six-freedom nonlinear simulation with great gain and high frequency disturbance proves that the reentry attitude control technique performs very well, and its control accuracy and robustness are brilliant.

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