scholarly journals High-Order Sliding Mode Control for Networked Control System with Dynamic Noncooperative Game Scheduling

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Weixuan Wang ◽  
Shousheng Xie ◽  
Bin Zhou ◽  
Jingbo Peng ◽  
Lei Wang ◽  
...  
Keyword(s):  
Collaborative Design ◽  
Sliding Mode ◽  
Dynamic Game ◽  
Optimization Theory ◽  
Networked Control System ◽  
Noncooperative Game ◽  
Control Value ◽  
Advanced Control ◽  
Sensor Signals ◽  
Uniqueness Of Nash Equilibrium

Specific to the NCSs where sensor signals can be processed centrally, a collaborative design scheme of dynamic game scheduling and advanced control theory was proposed in the present study. Firstly, by using the Jordan standard state space equation of the research object, the three elements of state noncooperative game were built, and the existence and uniqueness of Nash equilibrium solution were verified. In addition, the iterative equation of the scheduling matrix was derived by complying with the designed utility function. Secondly, refer to the number of restricted states the order of sliding mode was determined. And based on it, the corresponding sliding surface was designed. Subsequently, the quadratic optimization theory was adopted to regulate the control value following the implementation of the scheduling strategy to ensure that the control quality was further enhanced in the limited network service. Lastly, a TrueTime simulation example is established to verify the effectiveness of the proposed scheme.

scholarly journals Variable Structure Compensation PID Control of Asymmetrical Hydraulic Cylinder Trajectory Tracking

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Difei Liu ◽  
Zhiyong Tang ◽  
Zhongcai Pei
Keyword(s):  
Trajectory Tracking ◽  
Pid Control ◽  
Control Method ◽  
Sliding Mode ◽  
Variable Structure ◽  
Hydraulic Cylinder ◽  
Control Value ◽  
Equivalent Control ◽  
Asymmetrical Hydraulic Cylinder ◽  
The Stability

A novel variable structure compensation PID control, VSCPID in short, is proposed for trajectory tracking of asymmetrical hydraulic cylinder systems. This new control method improves the system robustness by adding a variable structure compensation term to the conventional PID control. The variable structure term is designed according to sliding mode control method and therefore could compensate the disturbance and uncertainty. Meanwhile, the proposed control method avoids the requirements for exact knowledge of the systems associated with equivalent control value in SMC that means the controller is simple and easy to design. The stability analysis of this approach is conducted with Lyapunov function, and the global stability condition applied to choose control parameters is provided. Simulation results show the VSCPID control can achieve good tracking performances and high robustness compared with the other control methods under the uncertainties and varying load conditions.

scholarly journals Active Fault-Tolerant/Active Passive Intrusion-Tolerant H ∞ Cooperative Control of Discrete NCS under the Background of Big Data

2021 ◽  
Vol 2021 ◽  
pp. 1-17
Author(s):  
Wang Jun ◽  
Meng Xiao-li
Keyword(s):  
Kalman Filter ◽  
Cooperative Control ◽  
Active Fault ◽  
Fault Tolerant ◽  
Sliding Mode ◽  
Discrete Event ◽  
Networked Control System ◽  
Adaptive Kalman Filter ◽  
Network Attack ◽  
Intrusion Tolerant

For the linear discrete networked control system (NCS) which may suffer DoS attack on both sides of the controller, when the actuator has time-varying failure, the intelligent sensor unit uses wireless sensors to collect data. According to the large amount of data collected, the active fault tolerance/active passive capacity of linear discrete NCS under the discrete event-triggered communication mechanism (DETCS) is studied. The problem of cooperative controller design is discussed. Firstly, a linear discrete NCS model integrating DETCS, actuator fault, and network attack is established. Then, based on the idea of integral sliding mode control, an active fault-tolerant/attack active passive intrusion-tolerant cooperative controller is designed, and the actuator attack side network attack and sensor side network attack are extended to the state to obtain a new state vector. Then, an adaptive Kalman filter estimator (AKF) estimates the fault and attack information and then adjusts the initial fault-tolerant/intrusion-tolerant cooperative controller in real time according to the estimated information obtained by the adaptive Kalman filter estimator; finally, the MATLAB simulation example is used to verify the improvement of system performance by the designed control law and the saving of network resources by the introduction of DETCS.

Modeling and Control of a Magnetostrictive Tool Servo System

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Witoon Panusittikorn ◽  
Paul I. Ro
Keyword(s):  
Sliding Mode ◽  
Magnetic Hysteresis ◽  
Mechanical Strain ◽  
Loop Control ◽  
Modeling And Control ◽  
Current Controller ◽  
Control Scheme ◽  
Highly Nonlinear ◽  
Advanced Control ◽  
And Control

A magnetostrictive actuator offers a long mechanical strain output in a broad bandwidth at a cost of a highly nonlinear magnetic hysteresis. Full utilization of this actuator in precision manufacturing requires a feedback loop as well as an advanced control scheme. A robust control scheme using sliding mode control with a variable switching gain was tailored to the nonlinear transducer. Nominal feedforward current controller that drives the magnetostriction was based on the inverse anhysteresis model. An additional switching gain based on the Lyapunov stability condition is implemented to restrain uncertainties. Compared to a traditional closed-loop control design, the proposed algorithm experimentally showed a greatly enhanced performance.

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