Research on Control Method of Complex Time-Varying System

2013 ◽  
Vol 760-762 ◽  
pp. 1278-1281
Author(s):  
Hong Bin Tian
Keyword(s):  
Control Method ◽  
Control Algorithms ◽  
System Control ◽  
Time Varying ◽  
Control Methods ◽  
Complex Time ◽  
Common Time ◽  
The Common ◽  
And Performance ◽  
Development Tendency

Because the charged objects have the factors of complexity, interference uncertainty and nonlinear, the time-varying system control method gains increasingly attentions. First, this paper carries the researches on the time-varying system classification and builds the control model of the time-varying system. Then the paper discusses the common time varying system control method and analyzes the state-of-art and performance of the control algorithms. Finally, it investigates the development tendency of the complex time-varying system control methods.

Robust control of two-link manipulator with disturbance torque and time-varying mass loads

2020 ◽  
Vol 42 (9) ◽  
pp. 1667-1674 ◽  
Author(s):  
Zhan Li ◽  
Deqing Huang
Keyword(s):  
Control Method ◽  
Control Algorithms ◽  
Time Varying ◽  
External Disturbances ◽  
Joint Torques ◽  
Control Approach ◽  
And Performance ◽  
And Control ◽  
Mass Loads ◽  
Varying Mass

Robot manipulators play important roles in helping people do repetitive dull jobs marvelously, with taking advantage of redundancy and flexibility. Two-link manipulators are one kind of basic manipulators and are applied in industrial and medical fields. In many application scenarios, external disturbances and time-varying mass loads may appear to have negative vibration effects on motion control for manipulators, and control algorithms that can eliminate such effects are urgently required. This paper proposes a novel control approach for accurate control of two-link manipulator with disturbance joint torques and time-variant mass loads. The proposed control algorithm can make the joint angle error to sustain in a limited bound under disturbances. Meanwhile, the proposed control method is able to make the two joints of the manipulator globally converge to zero if disturbances disappear. Simulation results show the efficiency of the proposed control approach for control of the two-link manipulator with disturbance torques and time-varying mass loads, and performance comparisons with other conventional control methods demonstrate its superiority.

ADAPTIVE CONTROL OF CHAOTIC n-SCROLL CHUA'S CIRCUIT

2006 ◽  
Vol 16 (04) ◽  
pp. 1089-1096 ◽  
Author(s):  
YAN-LI ZOU ◽  
JIE ZHU ◽  
GUANRONG CHEN
Keyword(s):  
Adaptive Control ◽  
Control Method ◽  
Control Methods ◽  
Chua’S Circuit ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Chua's Circuit ◽  
Low Pass ◽  
Attraction Basins ◽  
And Performance

In this paper, stabilization of fixed points of n-scroll Chua's circuit is investigated. Two adaptive control methods are proposed. One is based on an unstable low pass filter; the other is based on a stable and an unstable low pass filter. The simulation results verify the effectiveness of the two proposed control methods and performance comparisons show that the second control method is superior to the first one with regard to control speed and attraction basins.

Adaptive fault-tolerant attitude control for reentry vehicle involving actuator saturation

2018 ◽  
Vol 233 (11) ◽  
pp. 3968-3982
Author(s):  
Ming-Zhou Gao ◽  
Jian-Yong Yao
Keyword(s):  
Attitude Control ◽  
Control Method ◽  
Actuator Saturation ◽  
Fault Tolerant ◽  
Time Varying ◽  
Actuator Fault ◽  
Control Methods ◽  
Attitude Control System ◽  
Reentry Vehicle ◽  
Unknown Disturbances

Many control methods are used in attitude control of reentry vehicle, such as optimal control and classical control methods. However, those control laws may not work effectively if the attitude system is confronted with actuator faults and saturation. This paper proposes an adaptive fault tolerant attitude control method for the reentry vehicle's attitude control system, by combining the radial basis function network technology with adaptive fault tolerant control method. We simultaneously considered actuator fault, actuator saturation, time varying unknown disturbances and uncertainties when designing the control method. First, we set up the reentry attitude dynamic model concerning actuator fault; second, a finite-time H∞ adaptive fault-tolerant attitude controller is introduced to deal with the actuator fault, saturation, unknown disturbances and uncertainties of the reentry vehicle system; we proved the stability of our proposed adaptive attitude fault-tolerant controller through the Lyapunov function and the linear matrix inequality method. Finally, the effectiveness of such adaptive fault-tolerant control method has been identified by numerous simulation results. The simulation results show that our proposed method can not only effectively deal with actuator fault in the attitude control system, but also has very good robustness for actuator saturation, time varying unknown disturbances and uncertainties.

Experiment Design of the Defrosting Control Method of the Variable Refrigerant Flow Air Source Heat Pump

2011 ◽  
Vol 374-377 ◽  
pp. 162-165
Author(s):  
Xing Han ◽  
Jian Bo Chen
Keyword(s):  
Influencing Factors ◽  
Heat Pump ◽  
Control Method ◽  
Experiment Design ◽  
Control Methods ◽  
Air Source Heat Pump ◽  
The Common ◽  
The Impact

This paper first analyze the common air source heat pump defrosting control methods and their problems. Then, the impact of variable refrigerant flow technique on the air source heat pump frosting and defrosting is analyzed. Through experiment design, the influencing factors on inverter air source heat pump defrosting control methods will be studied.

scholarly journals Finite-Time Reentry Attitude Control Using Time-Varying Sliding Mode and Disturbance Observer

2015 ◽  
Vol 2015 ◽  
pp. 1-19 ◽  
Author(s):  
Xuzhong Wu ◽  
Shengjing Tang ◽  
Jie Guo ◽  
Yao Zhang
Keyword(s):  
Sliding Mode Control ◽  
Finite Time ◽  
Attitude Control ◽  
Disturbance Observer ◽  
Control Method ◽  
Sliding Mode ◽  
Time Varying ◽  
Control Methods ◽  
Mode Control ◽  
Attitude Controller

This paper presents the finite-time attitude control problem for reentry vehicle with redundant actuators in consideration of planet uncertainties and external disturbances. Firstly, feedback linearization technique is used to cancel the nonlinearities of equations of motion to construct a basic mode for attitude controller. Secondly, two kinds of time-varying sliding mode control methods with disturbance observer are integrated with the basic mode in order to enhance the control performance and system robustness. One method is designed based on boundary layer technique and the other is a novel second-order sliding model control method. The finite-time stability analyses of both resultant closed-loop systems are carried out. Furthermore, after attitude controller produces the torque commands, an optimization control allocation approach is introduced to allocate them into aerodynamic surface deflections and on-off reaction control system thrusts. Finally, the numerical simulation results demonstrate that both of the time-varying sliding mode control methods are robust to uncertainties and disturbances without chattering phenomenon. Moreover, the proposed second-order sliding mode control method possesses better control accuracy.

scholarly journals Open-Switch Fault Diagnosis Algorithm and Tolerant Control Method of the Three-Phase Three-Level NPC Active Rectifier

Energies ◽  
2019 ◽  
Vol 12 (13) ◽  
pp. 2495 ◽  
Author(s):  
Jun-Hyung Jung ◽  
Hyun-Keun Ku ◽  
Yung-Deug Son ◽  
Jang-Mok Kim
Keyword(s):  
Fault Diagnosis ◽  
Pulse Width Modulation ◽  
Control Method ◽  
Fault Tolerant ◽  
Control Methods ◽  
Active Rectifier ◽  
Three Phase ◽  
Open Switch ◽  
Diagnosis Method ◽  
And Performance

This paper proposes a fault diagnosis and tolerant control methods for an open-switch fault caused in a three-phase three-level neutral-point-clamped (NPC) pulse-width modulation (PWM) active rectifier. The open-switch fault in the three-level NPC active rectifier causes a distortion in the input phase current and a ripple in the DC-link capacitor voltage. Therefore, proper fault diagnosis and tolerant control methods are required to prevent additional failures and performance degradation in the rectifier system. This paper conducted a detailed analysis of the effect of the single open-switch fault on the NPC PWM active rectifier and proposed a fault diagnosis method utilizing the DC link voltage and the phase angle of the input grid voltage. Furthermore, this paper proposes a fault-tolerant control method to reduce the effect of the open-switch fault by compensating a distorted reference voltage. The effectiveness of the proposed fault diagnosis and tolerant control methods are verified through experimental results.

Control Methods of Active Power Filter

2011 ◽  
Vol 317-319 ◽  
pp. 2342-2345
Author(s):  
You Jie Ma ◽  
Jian Zhao ◽  
Xue Song Zhou
Keyword(s):  
Control Method ◽  
Great Influence ◽  
Active Power Filter ◽  
Active Power ◽  
System Control ◽  
Control Methods ◽  
Single Cycle ◽  
Power System Control ◽  
Advantages And Disadvantages ◽  
Power Filter

Active power filter (APF) is an important device to compensate harmonic and reactive current in power system control method adopted has a great influence on its performance. The paper introduces several control methods used by APF, including the deadbeat control, single-cycle control, space vector control and so on. After comparing and analyzing their individual advantages and disadvantages, some improvements for APF performance are proposed.

Optimized Pulse Modulation: A Novel Idea of a Digital Control Method for On/Off Valves

2011 ◽  
Author(s):  
Ingo Schepers ◽  
Daniel Weiler ◽  
Juergen Weber
Keyword(s):  
Digital Control ◽  
Closed Loop ◽  
Control Method ◽  
Closed Loop Control ◽  
The Novel ◽  
Control Methods ◽  
Pulse Control ◽  
Pulse Modulation ◽  
Loop Control ◽  
The Common

This article describes how on/off valves can be used in the closed loop control. After studying different industrial hydraulic applications typical requirements will be compiled. From these requirements a basic on/off valve architecture will be derived. In this article the number of parallel connected on/off valves per control edge is limited to one valve. So the typical digital hydraulics with a high number of parallel connected valves is not considered. The on/off valves could not be controlled like normal directional valves. To control on/off valves digital control methods are common to use. The digital control methods are not optimized for the hydraulic on/off valves, because the origins of the digital control methods will be found in the electrical engineering. The novel idea for the digital control methods is the optimized pulse control which eliminates the disadvantages of the common digital control methods. How the optimized pulse control works is described in this article.

Vehicle lane keeping system based on TSK fuzzy extension control

2019 ◽  
Vol 234 (2-3) ◽  
pp. 762-773
Author(s):  
Hongbo Wang ◽  
Wei Cui ◽  
Zhi Xia ◽  
Wuhua Jiang
Keyword(s):  
Fuzzy Control ◽  
Control Strategy ◽  
Control Algorithm ◽  
Control Method ◽  
Driving Safety ◽  
Control Algorithms ◽  
System Control ◽  
Control Effect ◽  
Lane Keeping ◽  
Takagi Sugeno

In the traditional lane keeping system, a single control algorithm is used for global-region control, which often results in poor control effect in some control areas. In view of this problem, a control method combining the extension control and Takagi-Sugeno-Kang fuzzy control is proposed for lane keeping system control. The extension control strategy based on the idea of control with area division divides different control regions according to the states of the system, and adopts different control algorithms in different control areas to address the limitation of a single control algorithm. For the randomness and inaccuracy of artificial experience in control domain division, a method for control domain division based on the density distribution of characteristic plane is proposed in this article. In order to further improve and explore the performance of extension control, Takagi-Sugeno-Kang extension controller is designed with Takagi-Sugeno-Kang fuzzy control theory, and the extension control performance is improved when switching among different control algorithms. The proposed control strategy is simulated and tested on the CarSim/Simulink joint simulation platform and the CarSim/LabVIEW hardware-in-loop test bench, respectively. The results show that the proposed control strategy can effectively keep the vehicle near the center line of the lane, and both the lane keeping control accuracy and vehicle stability are improved, which guarantees driving safety and comfort.

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