Electro-hydraulic Proportional Control Research Articles

The Development of a High-Speed Segment Erecting System for Shield Tunneling Machine

The present study is focused on developing an effective high-speed segment erecting system, which is specific for modern shield tunneling machine. The big steady-state error and large impact force caused by high motion speed and large inertia load are main restrictions for the conventional segment erector to realize high-speed segment erecting. To overcome the bottleneck, a new hydraulic system that is based on electrohydraulic proportional control technology is designed, the actuator speed of which is adjustable and controllable. The kinematic and dynamic models are established to determine the displacement of each actuator and calculate joint force, respectively. A combined motion law is then selected to reduce joint force during acceleration and deceleration stages. Furthermore, a superior control strategy that is able to precisely and smoothly control the segment erector at high speed is chosen by comparing the experimental performances of four different control strategies. Experiments are carried out on a segment erector test rig. The experimental results show exceptional performances of the speed and position compound control system in terms of accuracy and impact force. The maximum rotation speed of the new system can be increased to more than three times of that of the present erecting system. In addition, high steady-state accuracy can be achieved with the new system while its impact force is just about one-third of the position control system.

Research on Electro-Hydraulic Proportional Self-Tuning Fuzzy-PID Control System Based on MATLAB

The bogie separated equipment for straddle type monorail vehicle was researched, and the mathematics model of proportional hydraulic valve cylinder lifting system was set up and simulated. Based on the PID controller theory and the principle of fuzzy control, the fuzzy self-turning fuzzy-PID controller was designed. According to the fuzzy logic tool box and simulink of MATLAB, the simulation study was carried out. The results indicate that, the self-tuning fuzzy-PID controller can satisfy the requirements of the control system well.

Control Algorithm Analysis of Rig's Electro-Hydraulic Proportional Control System

The electro-hydraulic proportional control system of the rig rotary mechanism was designed, and the work principle and system structure were introduced. On the bases of analyzing the characteristics of PID control algorithm and Fuzzy control algorithm, the design and research were carried. Simulation experiments show that the Fuzzy - PID algorithm effectively improves the control performance of the control system, and has a good environmental adaptability.

Hydraulic System Research of the Pumping Unit Based on Electro-Hydraulic Proportional Control Technology

Trapezoidal curve is selected as the hydraulic pumping unit load running speed curve. Designed a new hydraulic system of hydraulic pumping unit according to the electro hydraulic proportional control technology and then expounded its working principle, in which the electro-hydraulic proportional directional throttle valve have been used. The system is feasible on the theory by analyzing its mathematical model. It would meet the requirement of hydraulic pumping unit and realize the advantages of it via controlling the input current signal of the amplifier.

Electrode Feeding Speed Control and Experiment Research of ESR Furnace Based on S Style Control Curve

The electrode feeding mechanism and the feeding speed control system of the electroslag remelting furnace are studied. The electrode feeding mechanism is designed based on the electro-hydraulic proportional control technique, and the mechanism’s three-dimensional model is established. The electrode feeding mechanism’s electro-hydraulic proportional control system is simulated. The basic feeding speed model and the error-correction feeding speed model are established; and the S style speed control curve of the electrode feeding system is designed. Experiments were carried out; the system control curves and the experimental production dissection results were obtained. It was found that, the electrode feeding system and the feeding speed control system studied in this paper met the craft procedure and technique requirements of large electroslag remelting furnace, and the method’s validity was verified.

Research on the Adaptive Cutting Method of Roadheader

The load on the cutting boom of roadheader changes violently because of the changes of rocks hardness. The power of cutter motor is related to the hardness of rock and propulsive force. The propulsive force is determined by the moving speed of cutting boom. The hydraulic control system of arcing cylinders is an electro-hydraulic proportional control system. The adaptive control model is build by Simulink. A PID control is used and the power of cutter motor is keep at a constant state by adjusting the speed of arcing cylinders.

The Electro-Hydraulic Proportional Technology-Based Experimental Research into Gradually Pressurization System on Cotton Lap of Roll Machine

This paper discussed two types of traditional pressurization system on cotton lap of roll machine—mechanical and pneumatic, analysed their working principle, put forward a new design concept, with compact structure, based on the electro-hydraulic proportional control technology and tested with experiments. The results showed its effective function to control pressure stably.

Electro-Hydraulic Proportional Flow Valve Control Complex Variable Pump and Research its Property for Injection Machine Hydraulic System

In hydraulic system of injection machine, electro-hydraulic proportional flow valve is used to change complex variable pump output flow and power in order to adapt to load change and energy saving.In this paper ,it introduces the working principle of electro-hydraulic proportional flow valve and how control the complex variable pump. Mathematical modeling of proportional flow valve is built and simulations based on Matlabsimulink software is done. It analyses dynamic characteristics of complex variable pump in different electricity. The results are helpful in improving the pump efficiency and response,and they provide theoretical basis for energy saving.

The Research of Electro-Hydraulic Proportional Control on Copper Anode Lifting Platform

This paper introduces the structure and working principle of the designed copper anode lifting platform. According to the actual working conditions and the structure of the lifting device, hydraulic system of electro-hydraulic proportional synchronous lifting device is designed and its working principle is analyzed. This paper takes the electro-hydraulic synchronization system as a research subject, whose mathematic model is established. To solve the synchronization accuracy of the hydraulic cylinder movement in the lifting process, a model reference adaptive controller is designed which is based on hyperstability theory. Both system simulation models of traditional PID control and adaptive control are established respectively in the software of Matlab/Simulink. Through the simulation result we can learn that adaptive control is batter than the PID control. Two hydraulic cylinders synchronization error is less than 0.02mm.

Design and Study on the Automatic Extrusion Device for Curved Chassis of Vibratory Feeder

Vibratory feeder is a device which is used to arrange small workpieces in neat rows and convey them from one place to another by vibratory feeding. It has been playing a key role in automation production. According to manufacturing equipments for the chassis of vibratory bowl feeder, this paper makes studies mainly in the followings: (1) introduces the principle of the vibratory feeder briefly, (2) the mechanical structure of the automatic extrusion device for curved chassis of vibratory feeder is designed, including frame, moulds and guiding mechanism, (3) static analysis, mould stress analysis are done by using the finite software ANSYS, (4) based on the electro-hydraulic proportional control technology, a hydraulic system is designed, (5) a control system based on STC89C52RC MCU(Micro Control Unit) is given. The problems of automatic extrusion for the curved chassis of vibratory feeder are successfully solved through the theoretical and experimental studies, which achieves the expected design goals and fills in a gap in this field in China, which brings great economic and social potential benefits and has wide application prospect.

Modeling and Simulation of Emulsion Pump Station Pressure Control System Based on Electro-Hydraulic Proportional Relief Valve

The emulsion pump station is the power source of the hydraulic support and the hydraulic props of fully-mechanized mining face. Providing work medium such as high pressure and big flow for the system used liquid such as hydraulic support are its responsibility. This paper put forward a system can control the pressure of the emulsion pump station based on electro-hydraulic proportional relief valve. After applying the electro-hydraulic proportional relief valve technique, this system reconstructed the pipeline of pump station. In order to realize the control of pressure, this system used the PID controller in PLC technique to perform logical operations and finally controlled the unload action of overflow valve. This paper give a detailed design of the system, and then build a mathematical model based on the electro-hydraulic proportional pressure control system hardware and analysis the results of control using simulation software.

Design of Hydraulic System of Sway Machine Based on Electro-Hydraulic Proportional Control Technology

According to the problems of hydraulic system of sway machine, such as commissioning and maintenance are inconvenient, impact of change direction is big, system speed is slow, production efficiency is low, etc. It used electro-hydraulic proportional control valve to improve design in hydraulic system of sway machine. Application of electro-hydraulic proportional control valve has realized automatic adjustment of the hydraulic motor speed; it is effective to solve variable speed movement of sway machine frame and no impact of changing direction smooth. Commissioning and maintenance of sway machine are more convenient, and it improves performance of sway machine.

Design and Analysis on the Dynamic System of an Oil-Well Pump Lifting Test System

In order to meet the demand of the oil-well pump lifting test, designed a set of dynamic system, which can do long stroke reciprocating motion rapidly. On the use of composite liquid cylinder can effectively solve the problem of the load force is not the average when the cylinder moves reciprocally. The maximum lifting force of dynamic system is 120kN; maximum speed is 0.8m/s, reached the design index. At the same time, this set of dynamic system combined electro-hydraulic proportional control method and the oil production, provides a new exploring space.

Fuzzy-PID Control in Electro-Hydraulic Proportional Valve Control System of Snow-Melting Agent Spreading Truck

According to the characteristic of the snow-melting agent spreading truck that the spreading measurement is maintaining unchanged when it's in the operation process. We designed the rotate speed system controlled by the method of electro-hydraulic proportional control. With the nonlinearity and time-varying of the controlled system, we applied the method of Fuzzy-PID control to conduct the study of electro-hydraulic proportional speed system. By the simulation of MATLAB/SIMULINK, the results shows the dynamic property of the system gets obviously improved with using the Fuzzy-PID controller and verifies the effectiveness and practical applicability of this design.

Design on Electro-hydraulic Proportional Controller

As the connection of micro-electronics and powerful engineering equipment, Electro-Hydraulic proportional controller has been important part of integration of mechanics and electrics. It’s the core of Electro-Hydraulic proportional controller system and has a tremendous impact on it. The prevalence of domestic proportional controller poor reliability, short life and other issues, therefore, this paper developed a new type of electro-hydraulic proportion controller with a graphics user interface based on Qt. After experiment, it shows the controller has some advantages as follows, low power consumption, high repeatability precision and low temperature drift. And the graphics user interface is friendly with stable performance

GUI Design for Electro-Hydraulic Proportional Controller Based on Qt

In order to meet the requirements of electro-hydraulic proportional controller interface in embedded system, a GUI design method based on Qt Embedded is developed in this paper. Furthermore, the vital techniques, including installation, design, are analyzed in detail. This GUI system is employed in the embedded electro-hydraulic proportional controller. It shows the graphical user interface is friendly with stable performance.

Modeling and Simulation of Electro-Hydraulic Proportional Position Control System with the Flexible Hose

A method which utilizes the power bond graph to establish the flexible hose model is described in this work. By using this method, the paper establishes mathematical modeling for the location of electro-hydraulic proportional control system with the flexible hose. And then, this article completes dynamic simulation by MATLAB and analyses the results of simulation. The effect of the flexible hose parameters on dynamics characteristics of the hydraulic system is also studied.

Analysis of Electro-hydraulic Proportional Speed Control System on Conveyer

In this paper, electro-hydraulic proportional control technology is used in speed control by a lead cathode walking-beam conveyer in order to ensure the accuracy of conveyor speed control. In simulation analysis, PID correction based on MATLAB software is used for the electro-hydraulic proportional control system. According to the results of simulation, PID correction is used to correct the system. And, trial and error are used to get suitable PID parameters. Simulation results show that: when there are small changes in load inertia, the system should have better indicators in time domain and frequency domain. It can deduce the requirements of lead cathode walking-beam conveyer speed control.

Test System of the Static and Dynamic Performance of the Proportional Solenoid

Proportional solenoid is the key component in electro-hydraulic proportional control systems. The static and dynamic performance of the proportional solenoid directly affects the control accuracy, response speed and reliability of the whole system. To test the static and dynamic performance of the proportional solenoid accurately, reliably as well as conveniently, an automatic test system with the combination of the sensor and control technology is developed in this paper. The entire system consists of mechanical structure which could position the proportional solenoid and adjust the displacement, the control and measurement part whose main function is to control the motion of the stepper motor ,set the drive current of the solenoid through the proportional amplifier and collect data. The experimental apparatus allows rapid switch between static test and dynamic test through two vertically-positioned pins and other accessories, which makes this test system different from the others. The experimental results demonstrate the feasibility and the rationality of the design.

Application of Direct Actuated Digital Servo Valve in Electrohydraulic Static Loading System

Structure static testing is an important means to study the static characteristic of complex engineering structure. Electrohydraulic stactic loading system is the singnificant equipment of the testing. With its function of transfering low-power electrical singal to large-power hydraulic output quickly and precisely, the servo valve plays a key role in an electrohydraulic servo control system and dominates to a large extent the performance of the whole control system. Conventional electrohydraulic servo or proportional control is subject to the nonlinearites of their electro-mechanical interface, such as hysteresis, saturation and finite resolution. In this paper, a direct actuated digital servo valve was applied in electrohydraulic static loading system. It can be driven directly by computer needn’t D/A and has the advantages of simple structure, high tolerance to contamination and high reliability. Practical load-experiment results show that the static loading system with a direct actuated digital servo valve can work steadily and reliably and possess high accuracy and fast response.