Design and Simulation of Fuzzy Control System in DSCC Processing of Cu Single Crystal

2010 ◽  
Vol 154-155 ◽  
pp. 545-552
Author(s):  
Hua Ping Xu ◽  
Yong Ming Bian ◽  
Xie Min Mao
Keyword(s):  
Fuzzy Control ◽  
Closed Loop ◽  
Control Process ◽  
Control Object ◽  
Control Device ◽  
Control Mode ◽  
Closed Loop Control ◽  
Random Disturbance ◽  
Directional Growth ◽  
Loop Control

Directional solidification continuous casting (DSCC) processing is steady directional growth process of Cu crystal. It was influenced by seven parameters, and very easy to be broken for some disturbance. Therefore, random crystals grew. In this paper, location of liquid-solid interface Z was set as control object. And correction disturbance closed-loop control was set as general control planning in DSCC processing. Then fuzzy control was selected as control mode. And control algorithm was designed. The closed-loop control process in DSCC processing was simulated. The simulation results showed that control object could return to safe rang even existing random disturbance. And the control process had good stability. Designed fuzzy control device could satisfy DSCC process requirement.

Research on Error Compensation by Semi-Closed Loop Control for a 3-UPS Parallel Machine Tool

2012 ◽  
Vol 461 ◽  
pp. 272-276
Author(s):  
Jian Ye Guo ◽  
Jia Shun Shi ◽  
Liang Zhao
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Closed Loop ◽  
Parallel Machine ◽  
Control Mode ◽  
Closed Loop Control ◽  
Kinematics Analysis ◽  
Compensation Strategy ◽  
Loop Control ◽  
Parallel Machine Tool

This paper took a 3-UPS Parallel Machine Tool (PMT) as the object of research; it mainly introduced the process of establishing the compensation strategy for this PMT. Firstly the kinematics equations on driving chain and constraint chain was established on the basis of kinematics analysis. Then according to the structural characteristics and the results of kinematics analysis, the error compensation strategy of feedback correction type with the semi-closed loop control mode was used in the error compensation for this PMT by the method of installing respectively the encoders on the each joint of parallelogram mechanism, namely the compensation way of “parallel driving and series feedback” was adopted. Finally this paper has also deduced the theoretical model of error compensation. The research results in this paper provided a theoretical basis for realizing error compensation of this PMT, and had important practical significance for improving machining precision of PMT

Dual-mode regenerative braking control strategy of electric vehicle based on active disturbance rejection control

2021 ◽  
pp. 095440702098564
Author(s):  
Dongsheng Sun ◽  
Junzhi Zhang ◽  
Chengkun He ◽  
Jinheng Han
Keyword(s):  
Control Strategy ◽  
Closed Loop ◽  
Ride Comfort ◽  
Control Mode ◽  
Regenerative Braking ◽  
Closed Loop Control ◽  
Loop Control ◽  
Braking System ◽  
Charging Current ◽  
Braking Control

The traditional regenerative braking control strategy usually uses the torque control mode and does not perform closed-loop control on the charging current, when the vehicle needs to be charged with a small current, the regenerative braking system cannot work effectively. The dual-mode regenerative braking control strategy proposed in this paper unifies the closed-loop control of regenerative current and the closed-loop control of regenerative torque. Especially when the battery is in a state of high charge or the temperature of the battery is too high or too low, this strategy can ensure charging safety, regeneration efficiency, and ride comfort. In the current closed-loop control mode, this proposal uses the ADRC controller to dynamically adjust the motor torque to achieve the purpose of accurately controlling the regenerative current. This method does not need to change the original vector control frame of the motor, which is convenient for engineering applications. The designed regenerative control strategy is verified through typical braking simulation. Bench tests are carried out and the results validate the feasibility and effectiveness of the designed strategy. Based on the realization of the safety of charging and the vehicle ride comfort, the proposed regenerative braking control strategy can achieve higher regeneration efficiency under the dynamical limitation of battery charging current, which further expands the operating range of the regenerative braking system.

Analysis on EPS Machitrical Dual Closed-Loop Control System

2012 ◽  
Vol 241-244 ◽  
pp. 1071-1075
Author(s):  
Wan Ying Wei ◽  
Jin Ying Chen ◽  
Gang Xie
Keyword(s):  
Control System ◽  
Fuzzy Control ◽  
Pid Control ◽  
Closed Loop ◽  
Steering System ◽  
Closed Loop Control ◽  
Loop Control ◽  
Closed Loop Control System ◽  
Loop Control System ◽  
The Difference

The electric power steering system (EPS) is a combination of mechanical and electrical control system. EPS’control strategy used commonly has two kinds: current PID control and fuzzy control .The current PID control based on the difference between target current and feedback current is a curren closed-loop control system and the fuzzy control is a mechanical closed-loop control system based on the difference between forces of the upper part and the lower part of the steering shaft . Taking the margin of the mechanical and electrical closed-loop control system, this paper, a torque feedback loop for the outer ring, a current feedback loop as the inner loop, designed a dual-loop control system, the output of the fuzzy control determined a target current, and then proceed to current PID control, fast-track the target torque. The simulation shows the dual closed-loop fuzzy PID control is superior to two commonly used control strategies so that electric power steering system has a better tracking ability and stability.

scholarly journals The Voltage Stabilizing Control Strategy of Off-Grid Microgrid Cluster Bus Based on Adaptive Genetic Fuzzy Double Closed-Loop Control

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Yu Zhang ◽  
Hongwan Yang ◽  
Peng Wang
Keyword(s):  
Energy Storage ◽  
Fuzzy Control ◽  
Dynamic Response ◽  
Real Time ◽  
Closed Loop ◽  
Scale Factor ◽  
Pi Control ◽  
Closed Loop Control ◽  
Control Parameters ◽  
Loop Control

In the off-grid microgrid cluster, the energy storage device is mainly charged and discharged to maintain the stability of the bus voltage and the system power balance. Generally, the voltage and current double closed-loop control and fuzzy control are adopted for the energy storage converter. The traditional double closed-loop control parameters and the scale factor and quantization factor in fuzzy control cannot be adjusted in real time during system operation, resulting in slower dynamic response and weak anti-interference ability of the system. In response to the above problems, this paper proposes an adaptive genetic fuzzy double closed-loop control, which can adjust the PI control parameters in real time by adjusting the quantization factor and the scale factor to optimize the control effect. The simulation platform is built in MATLAB/Simulink and the simulation results show that the adaptive genetic fuzzy double closed-loop control combines the advantages of fuzzy and PI control. Under different working conditions, the system has not only a fast dynamic response, small overshoot, and strong anti-interference ability but also good robustness.

scholarly journals Beyond Neural Coding? Lessons from Perceptual Control Theory

2019 ◽  
Vol 42 ◽  
Author(s):  
Xerxes D. Arsiwalla ◽  
Ruben Moreno Bote ◽  
Paul Verschure
Keyword(s):  
Twentieth Century ◽  
Control Theory ◽  
Neural Coding ◽  
Closed Loop ◽  
Control Process ◽  
Lessons Learned ◽  
Closed Loop Control ◽  
Loop Control ◽  
Perceptual Control Theory ◽  
Perceptual Control

Abstract Pointing to similarities between challenges encountered in today's neural coding and twentieth-century behaviorism, we draw attention to lessons learned from resolving the latter. In particular, Perceptual Control Theory posits behavior as a closed-loop control process with immediate and teleological causes. With two examples, we illustrate how these ideas may also address challenges facing current neural coding paradigms.

A Complete Decoupling PI Control of UPQC in α-β Coordinate System

2014 ◽  
Vol 1070-1072 ◽  
pp. 1228-1233
Author(s):  
Zhi Qun Luo ◽  
Wei We Han ◽  
Jian Ru Wan ◽  
Shao Lun Huang
Keyword(s):  
Coordinate System ◽  
Closed Loop ◽  
Control Method ◽  
Control Process ◽  
Control Unit ◽  
Pi Control ◽  
Closed Loop Control ◽  
Two Phase ◽  
Current Compensation ◽  
Loop Control

Aiming at the existing strong coupling problem of UPQC model in synchronous rotating coordinate system, in order to realize the control process easily and accomplish the complete decoupling, two-phase coordinate system α-β was introduced to the complete decoupling PI control of voltage and current compensation unit. According to the corresponding mathematical model, the topology map of voltage and current compensation unit was gained. Direct single closed-loop control method was used, meantime, parameter was set and the structure chart of PI control unit was designed. Finally, the effectiveness and feasibility of the control method is proved by Matlab/Smulink simulation and hardware experiment.

Aircraft Engine Control Mode Analysis

1985 ◽  
Vol 107 (4) ◽  
pp. 838-844 ◽  
Author(s):  
H. Brown ◽  
J. A. Elgin
Keyword(s):  
Closed Loop ◽  
Aircraft Engine ◽  
Control Mode ◽  
Mode Analysis ◽  
Closed Loop Control ◽  
Variational Models ◽  
Loop Control ◽  
Study Results ◽  
Safety Parameters ◽  
And Performance

This paper describes the control mode analysis procedure that is used to establish closed-loop control requirements for advanced aircraft propulsion systems. The procedure utilizes anticipated variations in engine component performance, engine deterioration, and control tolerances in a statistical analysis to establish corresponding variations in engine output performance and safety parameters. Potential closed-loop control configurations are evaluated by this process, compared, and the best configuration selected for implementation into control law and schedule designs. A byproduct of the analysis is the establishment of engine design and performance margins. The paper will describe typical engine variational models used in this process, the General Electric COMET program designed to automate the analysis, and typical mode study results based on a current augmented turbofan engine.

The Error Compensation Strategy of 3-TPT Parallel Machine Tool Based on Semi-Closed Loop Control

2011 ◽  
Vol 321 ◽  
pp. 176-179
Author(s):  
Jian Ye Guo ◽  
Zhong Qi Sheng ◽  
Liang Zhao
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Closed Loop ◽  
Parallel Machine ◽  
Control Mode ◽  
Closed Loop Control ◽  
Kinematics Analysis ◽  
Compensation Strategy ◽  
Loop Control ◽  
Parallel Machine Tool

This paper took a kind of 3-TPT Parallel Machine Tool (PMT) as the object of research; it mainly introduced the process of establishing the compensation strategy for this PMT. Firstly the kinematics equation of this PMT was established on the basis of kinematics analysis, the results showed that the kinematics equation of this PMT have characteristics that are simple calculation, explicit expression and unique solution. Then according to the structural characteristics and the results of kinematics analysis, the error compensation strategy of feedback correction type with the semi-closed loop control mode was used in the error compensation for this PMT by the method of assembling the gratings on the driving rods, namely the compensation way of “parallel driving and parallel feedback” was adopted. The research results in this paper provided a theoretical basis for realizing error compensation of this PMT, and had important practical significance for improving machining precision of PMT.

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