scholarly journals A Novel Compound Control Method for Hydraulically Driven Shearer Drum Lifting

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
Lei Si ◽  
Zhongbin Wang ◽  
Xinhua Liu ◽  
Lin Zhang
Keyword(s):  
Control Method ◽  
Rbf Neural Network ◽  
Response Speed ◽  
Hydraulic Cylinder ◽  
Control Approach ◽  
Tuning Parameters ◽  
Compound Control ◽  
Control Precision ◽  
Asymmetrical Hydraulic Cylinder ◽  
Fractional Order Pid

In order to adjust shearer drum swiftly and precisely to adapt to the changes of coal seam, a compound control approach based on cerebellar model articulation control and fractional order PID controller was proposed. As the movement precision and response speed of hydraulic system were determined mainly by the control precision of valve-controlled asymmetrical hydraulic cylinder, its working principle and characteristics were analyzed in this paper, with particular focusing on the asymmetry problem. Furthermore, RBF neural network was applied to obtaining reasonable tuning parameters and a control algorithm of proposed controller was designed. Finally, laboratory experiments were developed to verify the validity and effectiveness of proposed compound control method. The testing results, compared with those for other controllers, proved that the proposed compound control method can acquire high movement precision and respond speed in the system of hydraulically driven shearer drum lifting with different control conditions.

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.

Variable Universe Fuzzy PID Control for Minimally Invasive Operation Robotic Catheter System

2014 ◽  
Vol 618 ◽  
pp. 470-474
Author(s):  
Jing Bo Shi
Keyword(s):  
Minimally Invasive ◽  
Pid Control ◽  
Control Method ◽  
Response Speed ◽  
Fuzzy Pid ◽  
Fuzzy Pid Control ◽  
Fast Tracking ◽  
Variable Universe ◽  
Control Precision ◽  
Minimally Invasive Operation

Robotic catheter minimally invasive operation requires control system of quick response, strong anti-jamming and real-time tracking of target trajectory. The contradiction between fuzzy PID control precision and its response speed limits its application in master-slave minimally invasive operation. The paper adopted variable universe fuzzy PID method to improve fuzzy PID method’s control precision without reducing the speed of response. The simulation results show that variable universe fuzzy PID control method has fast tracking performance and strong robustness, and it has feasibility and practicability in robotic catheter minimally invasive operation.

scholarly journals A compliant control method for robust trot motion of hydraulic actuated quadruped robot

2018 ◽  
Vol 15 (6) ◽  
pp. 172988141881323 ◽  
Author(s):  
Teng Chen ◽  
Xuewen Rong ◽  
Yibin Li ◽  
Chao Ding ◽  
Hui Chai ◽  
...  
Keyword(s):  
Motion Control ◽  
Control Method ◽  
Middle Layer ◽  
Bottom Layer ◽  
Hydraulic Cylinder ◽  
Simulation Software ◽  
Lateral Impact ◽  
Software Environment ◽  
Control Approach ◽  
Active Compliance

A motion control approach is proposed for hydraulic actuated quadruped robots, aiming to achieve active compliance and robust motion control. The approach is designed with a structure of three layers. Servo valve-controlled asymmetric hydraulic cylinder model is established to obtain the relationship between the desired torque and the control current signal, which is the bottom layer. The middle layer is based on the virtual model of the leg for active compliance. The upper layer considers the torso posture and velocity into planning the foot trajectories based on the spring loaded inverted pendulum model. Trotting gait simulations are conducted based on the proposed framework in the simulation software environment Webots. The motion control approach has been implemented on a robot prototype SCalf-II (SDU calf), where experiments have been conducted including omnidirectional trotting gait, lateral impact recovery and climbing slopes. The experiments demonstrate that the proposed approach can effectively control the hydraulic actuated robots.

Study on the control method about improving piezoelectric actuated photoelectric precision tracking system

2020 ◽  
pp. 1-12
Author(s):  
Zongkai Liu ◽  
Yuming Liu ◽  
Yuheng Zhang
Keyword(s):  
Control Method ◽  
Sliding Mode ◽  
Rbf Neural Network ◽  
Tracking System ◽  
Large Angle ◽  
Response Speed ◽  
Field Of View ◽  
Small Range ◽  
Adaptive Backstepping ◽  
Precision Tracking

Fast steering mirrors (FSM) driven by Piezoelectric transducer (PZT) are widely used in various precision stable tracking systems. Aiming to counteract the hysteresis and non-linear interference in PZT, this work applies a radial basis function (RBF) neural network to approximate its nonlinearity. Adaptive backstepping sliding mode (ABSM) controller combinewith a sliding mode control method and backstepping control is designed. Combining the characteristics of PZT and voice coil motors (VCM), the FSM driven by VCM is designed as the power sub-system to ensure that the large-angle deflection of the FSM can match a wider field of view. The FSM driven by PZT is designed as a correction sub-system, which can adjust the system error within a small range. Finally, the power sub-system and the correction sub-system are combined into a two-level precision tracking system. The simulation results show that the maximum steady-state error of the system is about 15 μrad, and the root mean square error is about 10 μrad. Compared with the traditional PI controller, the error is reduced by about 75%, the response speed is up to 10 ms, and the output is smooth without some serious viberation.

Influence of Repetitive PI-P Control on Performance of Inverters Wireless Parallel System

2013 ◽  
Vol 325-326 ◽  
pp. 508-514
Author(s):  
Jin Cheng Wei ◽  
Ye Liu ◽  
Yan Miao ◽  
Qian Shi
Keyword(s):  
Control Method ◽  
Repetitive Control ◽  
Response Speed ◽  
Pi Control ◽  
Matlab Simulation ◽  
Nonlinear Load ◽  
Loop Control ◽  
Control Precision ◽  
Steady State Control ◽  
Close Loop Control

For wireless parallel inverters system, there is a high requirement of control precision: otherwise current-sharing effect would be very poor. Based on this characteristic of wireless paralleling technology, this paper represents the combination control method of repetitive control with PI-P voltage and current double close loop control (abbreviation as PI control) in this system. This control method, which combines with PI control, has relatively faster dynamic response speed, improves not only the capacity with nonlinear load and parallel circulation characteristics by characteristics of repetitive control, but also the steady state control accuracy of the system, meanwhile reduces the harmonic content. Its an outstanding composite control method. This paper proves the feasibility and superiority of this method by MATLAB simulation.

scholarly journals Application of Repetitive Control and ANFIS-PI Compound Control Strategy in APF

2021 ◽  
Vol 2121 (1) ◽  
pp. 012037
Author(s):  
Mengtao Zhang ◽  
Tao Sui
Keyword(s):  
Control Strategy ◽  
Control Method ◽  
Balance Control ◽  
Dynamic Performance ◽  
Repetitive Control ◽  
Response Speed ◽  
Fast Response ◽  
Application Process ◽  
Actual Application ◽  
Compound Control

Abstract In order to effectively solve a series of problems caused by harmonics in power system, an active power filter based on ANFIS-PI and repetitive control is designed. The traditional single control method cannot balance control accuracy and response speed, so a compound control strategy is adopted. Repetitive control can produce the same output as the harmonic current, so it can achieve zero steady-state error tracking compensation for each harmonic, but its dynamic performance is not good. As a traditional control method, the PI control method has a fast response speed, but in the actual application process, when the load changes suddenly, that is, when the system parameters change, its tracking effect is not ideal. Therefore, a composite control strategy of ANFIS-PI and repeated control is proposed. It has been proved that its compensation accuracy and dynamic response speed have been significantly improved.

PRESSURE PATTERN IMPROVEMENT OF PROPORTIONAL VALVE APPLICATION ON HOT PRESS MACHINE USING PID

2020 ◽  
Vol 1 (1) ◽  
pp. 44-48
Author(s):  
Widianto Stevanus ◽  
Hanny J Berchmans ◽  
Aulia A Iskandar
Keyword(s):  
Hydraulic Cylinder ◽  
Tuning Parameter ◽  
System Modelling ◽  
Hot Press ◽  
Proportional Valve ◽  
Tuning Parameters ◽  
Control Precision ◽  
Control Scheme ◽  
System Controller ◽  
The Mathematical Model

The purpose of this study is to develop a control scheme for the hydraulic proportionalsystem using PID function on Mitsubishi PLC Q series, which can rapidly control the pressurein a hydraulic cylinder with very short stroke. The mathematical model of the control system isestablished according to the principle of the electro-hydraulic system. Considering the mentionedcharacteristics, simulation of the system modelling will be established to know the systemresponse. In order to improve the control precision of the hydraulic hot-press system, theMitsubishi PID controller are designed by selecting appropriate tuning parameters. Their controlperformances are analysed in time domain respectively. The variation of PID controllerconfiguration will be conduct to know the better model for this system controller. The validityof the proposed control scheme is confirmed through the experiments to verify the rationality ofthe theoretical model. The results show that the Mitsubishi PID and the ideal PID give the sameresult for the tuning parameter resulted from simulation. And also the experiment give the betterstability in the 3 different pressure set value that conduct by author.

Adaptive Control for NC Position Table Base on Radical Basis Function Neural Network

2013 ◽  
Vol 404 ◽  
pp. 699-703 ◽  
Author(s):  
Jing Ma ◽  
Hong Yu Wu ◽  
Xiao Ming Ji ◽  
Yan Lei
Keyword(s):  
Neural Network ◽  
Control Method ◽  
Rbf Neural Network ◽  
System Optimization ◽  
Learning Ability ◽  
Control Precision ◽  
Learning Speed ◽  
Speed Up ◽  
Good Learning ◽  
Non Linear System

Dynamic optimization control algorithm is put forward for X-Y position table. Firstly, dynamics model of X-Y position table is established, then, RBF neural network with good learning ability is used to approach non-linear system. Optimization algorithm of network weights is designed to speed up the learning speed and the adjustment velocity. The control method is more effective to improve the control precision and has a good application value.

Fractional Order PID Control of Railway Rescue Crane Leveling System

2014 ◽  
Vol 620 ◽  
pp. 449-455
Author(s):  
Jun Peng Shao ◽  
Ling Zhang ◽  
Zhao Hui Jin ◽  
Xiao Dong Yang
Keyword(s):  
Fractional Order ◽  
Pid Control ◽  
Pid Controller ◽  
Control Method ◽  
Servo System ◽  
Response Speed ◽  
Simulation Software ◽  
Step Response ◽  
Fractional Order Pid ◽  
Fractional Order Pid Controller

Aiming at the overshoot problem of electro-hydraulic position servo system used in the process of railway rescue crane hydraulic automatic leveling, and based on its characteristics such as big output power, high control accuracy, quick response speed, et al, this paper established the linear mathematical model of railway rescue crane electro-hydraulic automatic leveling system, besides, the fractional order PID control method was proposed based on the oustaloup digital filter algorithm and the working principle of fractional order PID control method was given, and then the fractional order PID controller was designed. In order to verify the effectiveness of the proposed control strategy, the MATLAB/Simulink simulation software was used. The simulation results show that the fractional order PID controller improved the speed of electro-hydraulic servo system unit step response and the capacity of resisting disturbance compared to traditional integer order PID controller, besides it can ensure the response without overshoot at the same time, so it meets the requirements for rapidity and no overshoot of railway rescue crane hydraulic automatic leveling system very well.

ICMA: AN EFFICIENT INTEGRATED CONGESTION CONTROL APPROACH

2019 ◽  
Vol 14 ◽  
Author(s):  
Tayyab Khan ◽  
Karan Singh ◽  
Kamlesh C. Purohit
Keyword(s):  
Congestion Control ◽  
Packet Loss ◽  
Control Method ◽  
Multicast Communication ◽  
Bandwidth Utilization ◽  
File Transfer ◽  
Control Approach ◽  
Communication Technique ◽  
Control Scheme ◽  
Multiparty Video Conferencing

Background: With the growing popularity of various group communication applications such as file transfer, multimedia events, distance learning, email distribution, multiparty video conferencing and teleconferencing, multicasting seems to be a useful tool for efficient multipoint data distribution. An efficient communication technique depends on the various parameters like processing speed, buffer storage, and amount of data flow between the nodes. If data exceeds beyond the capacity of a link or node, then it introduces congestion in the network. A series of multicast congestion control algorithms have been developed, but due to the heterogeneous network environment, these approaches do not respond nor reduce congestion quickly whenever network behavior changes. Objective: Multicasting is a robust and efficient one-to-many (1: M) group transmission (communication) technique to reduced communication cost, bandwidth consumption, processing time and delays with similar reliability (dependability) as of regular unicast. This patent presents a novel and comprehensive congestion control method known as integrated multicast congestion control approach (ICMA) to reduce packet loss. Methods: The proposed mechanism is based on leave-join and flow control mechanism along with proportional integrated and derivate (PID) controller to reduce packet loss, depending on the congestion status. In the proposed approach, Proportional integrated and derivate controller computes expected incoming rate at each router and feedback this rate to upstream routers of the multicast network to stabilize their local buffer occupancy. Results: Simulation results on NS-2 exhibit the immense performance of the proposed approach in terms of delay, throughput, bandwidth utilization, and packet loss than other existing methods. Conclusion: The proposed congestion control scheme provides better bandwidth utilization and throughput than other existing approaches. Moreover, we have discussed existing congestion control schemes with their research gaps. In the future, we are planning to explore the fairness and quality of service issue in multicast communication.

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