Robust Linear Quadratic Sliding-Mode Control for Hard Disk Drives

2007 ◽  
Vol 56 (3) ◽  
pp. 1087-1093 ◽  
Author(s):  
Kwan-Ho You ◽  
Minsuk Hong
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Linear Quadratic ◽  
Mode Control

Discrete-Time Sliding Mode Control With Time-Varying Surface for Hard Disk Drives

2009 ◽  
Vol 17 (1) ◽  
pp. 175-183 ◽  
Author(s):  
Qinglei Hu ◽  
Qinglei Hu ◽  
Chunling Du ◽  
Lihua Xie ◽  
Youyi Wang
Keyword(s):  
Sliding Mode Control ◽  
Discrete Time ◽  
Sliding Mode ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Time Varying ◽  
Disk Drives ◽  
Mode Control

Dynamic modelling and linear quadratic sliding mode control of a multivariable looper system in hot strip mills

2021 ◽  
Vol 118 (2) ◽  
pp. 215
Author(s):  
Yin Fang-Chen ◽  
Wu Xiang-Cheng
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Dynamic Modelling ◽  
Control Law ◽  
Linear Quadratic ◽  
Mode Control ◽  
Sliding Motion ◽  
Quadratic Performance ◽  
Hot Strip Mills ◽  
Looper System

This paper introduces a linear quadratic sliding mode control (LQ-SMC) scheme into a looper control system. First, according to a 1700 mm tandem hot mill, the state-space dynamic model of the looper system was established, and then, the optimal control law of the looper system was obtained based on the established model. Finally, the optimal sliding mode and optimal sliding mode control law of the LQ-SMC scheme were designed such that the sliding motion could satisfy the optimal value of the quadratic performance index. Simulation results show that the proposed control scheme has complete robustness to external disturbances that satisfies certain conditions, and the coupling between the looper angle dynamic and strip tension dynamic is also minimized.

Sliding Mode Control for Hexacopter Stabilization with Motor Failure

2016 ◽  
Vol 28 (6) ◽  
pp. 936-948 ◽  
Author(s):  
Yi Yang ◽  
◽  
Wei Wang ◽  
Daisuke Iwakura ◽  
Akio Namiki ◽  
...  
Keyword(s):  
Sliding Mode Control ◽  
Degrees Of Freedom ◽  
Sliding Mode ◽  
Linear Constraints ◽  
Control Input ◽  
Linear Quadratic ◽  
Mode Control ◽  
Integral Controller ◽  
Quadratic Integral ◽  
Comparative Results

[abstFig src='/00280006/18.jpg' width='300' text='Hovering with 5 rotors' ] This study presents a fault-tolerance approach for hexacopters with failed propulsion systems (i.e., motors and propellers) using sliding mode control theory. In this study, we use an explicit control allocation method with linear constraints for allocating the control input to redundancy actuators, as well as a new sliding model controller designed to stabilize the attitude and maintain the basic flight performance of a vehicle with a single failed motor during an outdoor autonomous flight mission. An asymmetrical motor rotation arrangement is applied in order to ensure controllability for all degrees of freedom. We verify the developed system on a real hexacopter suffering propulsion-system failure. Finally, the comparative results between the linear-quadratic-integral controller and model reference sliding mode controller are presented to evaluate the robustness of each controller against the failure of redundancy actuators.

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