scholarly journals Smooth Sliding Mode Control and Its Application in Ship Boiler Drum Water Level

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Sheng Liu ◽  
Shiquan Zhao ◽  
Yuchao Wang
Keyword(s):  
Process Control ◽  
Sliding Mode Control ◽  
Water Level ◽  
Sliding Mode ◽  
Sliding Mode Controller ◽  
Second Derivative ◽  
Level Control ◽  
Control Variables ◽  
Smooth Control ◽  
Boiler Drum

In process control, most of the control variables are position quantity which needs to be smooth, such as the opening of valve. In order to get smooth control, a smooth full-order sliding mode controller is proposed. Since the switching term in the proposed method is put into the second derivative of control u, the control u is smooth and its derivative is continuous. The proposed method is tested in drum water level control of the ship boiler, and the results show the effectiveness of the proposed method.

scholarly journals Performance Comparison of Different Advanced Control Schemes for Glucose Level Control under Disturbing Meal

2017 ◽  
Vol 13 (3) ◽  
pp. 55-63
Author(s):  
Bashar Fateh Midhat ◽  
Amjad Jaleel Humaidi
Keyword(s):  
Sliding Mode Control ◽  
Glucose Concentration ◽  
Disturbance Rejection ◽  
Sliding Mode ◽  
Blood Glucose Concentration ◽  
Optimal Controller ◽  
Sliding Mode Controller ◽  
Level Control ◽  
Integral Sliding Mode ◽  
Mode Control

Abstract In this work, diabetic glucose concentration level control under disturbing meal has been controlled using two set of advanced controllers. The first set is sliding mode controllers (classical and integral) and the second set is represented by optimal LQR controllers (classical and Min-, ax). Due to their characteristic features of disturbance rejection, both integral sliding mode controller and LQR Minmax controller are dedicated here for comparison. The Bergman minimal mathematical model was used to represent the dynamic behavior of a diabetic patient’s blood glucose concentration to the insulin injection. Simulations based on Matlab/Simulink, were performed to verify the performance of each controller. In spite that Min-max optimal controller gave better disturbance rejection capability than classical optimal controller, classical sliding mode controller could outperform Min-max controller. However, it has been shown that integral sliding mode controller is the best of all in terms of disturbance rejection capability.   Key words: Optimal LQR control, Optimalminimax control, Sliding mode control, Integral sliding mode control.

Design of Fractional Order Fuzzy Controller Based on Sliding Mode Control for Robotic Flexible Joint Manipulators

2011 ◽  
Vol 109 ◽  
pp. 323-332 ◽  
Author(s):  
Ali Fayazi ◽  
Amir Hossein Hadjahmadi
Keyword(s):  
Sliding Mode Control ◽  
Fractional Order ◽  
Fuzzy Controller ◽  
Sliding Mode ◽  
Tracking Error ◽  
Robotic Manipulators ◽  
Sliding Mode Controller ◽  
Level Control ◽  
Mode Control ◽  
Fractional Control

In this paper, a new design approach that combines the advantages in terms of robustness of the fractional control, the fuzzy scheme and the Sliding Mode Control (SMC) is proposed for robotic manipulators. A fractional order fuzzy sliding-mode controller (FOFSMC) can drive system tracking error to converge to zero in finite time. The FOFSMC is applied to a level control in robotic manipulators. Performance of the proposed controller evaluated to compare the performance with respect the conventional sliding mode controller. The simulation results demonstrate that the FOFSMC can provide a reasonable tracking performance.

An Application of Sliding Mode Controller to Nonminimum-Phase Nuclear Steam Generator Water Level Control

2002 ◽  
Vol 35 (1) ◽  
pp. 227-231
Author(s):  
Kwangsoo Kim ◽  
Hyungjin Kim ◽  
Yunchul Kim ◽  
Seungrohk Oh ◽  
Dong-il “Dan” Cho
Keyword(s):  
Water Level ◽  
Steam Generator ◽  
Sliding Mode ◽  
Sliding Mode Controller ◽  
Level Control ◽  
Nonminimum Phase

Sliding Mode Control of an Actuated Knee Joint Orthosis

2021 ◽  
Vol 15 ◽  
Author(s):  
Imen Saidi ◽  
Asma Hammami
Keyword(s):  
Sliding Mode Control ◽  
Lower Limb ◽  
Sliding Mode ◽  
Position Tracking ◽  
Sliding Mode Controller ◽  
Mechanical Device ◽  
Tracking Errors ◽  
Mode Control ◽  
Speed Tracking ◽  
Human Morphology

Introduction: In this paper, a robust sliding mode controller is developed to control an orthosis used for rehabilitation of lower limb. Materials and Methods: The orthosis is defined as a mechanical device intended to physically assist a human subject for the realization of his movements. It should be adapted to the human morphology, interacting in harmony with its movements, and providing the necessary efforts along the limbs to which it is attached. Results: The application of the sliding mode control to the Shank-orthosis system shows satisfactory dynamic response and tracking performances. Conclusion: In fact, position tracking and speed tracking errors are very small. The sliding mode controller effectively absorbs disturbance and parametric variations, hence the efficiency and robustness of our applied control.

Study on Sliding Mode Control in Bidirectional DC/DC Converter Based on State Space Averaging Method

2014 ◽  
Vol 678 ◽  
pp. 399-405
Author(s):  
Yan Mei
Keyword(s):  
Sliding Mode Control ◽  
State Space ◽  
Averaging Method ◽  
Sliding Mode ◽  
Good Stability ◽  
Sliding Mode Controller ◽  
Battery Charging ◽  
Mode Control ◽  
Logic Diagram

Bidirectional DC/DC converter is used for the battery charging and discharging. The sliding mode controller based on state space averaging algorithm is used for controlling bidirectional DC/DC converter. Two kinds of working modes, buck mode and boost mode, have been analyzed and three kinds of working states which are consisted by two working modes have been deeply discussed, and the automatic switch logic diagram when battery charging and discharging through the bidirectional DC/DC converter has been presented. Situation of system based on S1, S2 conducting alternately has been studied, and the simulations were also presented. According to the results, the characteristics of good stability and transient can be confirmed.

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