Hydraulic Position Control System With Variable Speed Pump

2009 ◽  
Author(s):  
Hakan C¸alıs¸kan ◽  
Tuna Balkan ◽  
Bu¨lent E. Platin
Keyword(s):  
Position Control ◽  
Time Windows ◽  
Open Loop ◽  
Step Response ◽  
Feedback Signal ◽  
Test Results ◽  
Variable Speed ◽  
Set Up ◽  
The Mathematical Model ◽  
Position Control System

In this study, a valveless energy saving hydraulic position control servo system controlled by two pumps is investigated. In this system, two variable speed pumps driven by servomotors regulate the flow rate through a differential cylinder according to the needs of the system, thus eliminating the valve losses. The mathematical model of the system is developed in MATLAB Simulink environment. A Kalman filter is applied to reduce the noise in the position feedback signal. In the test set up developed, open loop and closed loop frequency response and step response tests are conducted by using MATLAB Real Time Windows Target (RTWT) module, and test results are compared with the model outputs.

Simulation on Electro-Hydraulic Proportional Position Control System under Pressure Boundary Conditions

2011 ◽  
Vol 186 ◽  
pp. 21-25
Author(s):  
Jin Yu ◽  
Yuan Li ◽  
Xiao Kang Xu
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Boundary Conditions ◽  
Position Control ◽  
Step Response ◽  
Quick Response ◽  
Bode Diagram ◽  
The Mathematical Model ◽  
Pressure Boundary Conditions ◽  
Position Control System

Nowadays, the hydraulic straightening presses play an important role in straightening mandrels. For different mandrels, straightening forces and reductions differ. So the proportional position control system under pressure boundary conditions is required. The mathematical model of the system is deduced, and simulation of the system is carried out by MATLAB. The curves of step response and Bode diagram show that the system is steady and quick-response. The error caused by load is analyzed, which meets the straightening requirements and validates its design. The work in this paper can provide a high guidance for presses of similar kinds.

scholarly journals Reduced Order Model of Position Control System

2011 ◽  
pp. 113-115
Author(s):  
Yogesh V. Hote ◽  
A. N. Jha ◽  
J. R. P. Gupta
Keyword(s):  
Control System ◽  
Position Control ◽  
Open Loop ◽  
Simple Approach ◽  
Reduced Order Model ◽  
Order Model ◽  
Reduced Order ◽  
Reduced Order Modelling ◽  
Position Control System

In this paper, simple approach is proposed to determine reduced order model of a unstable open-loop position control system. This approach is based on Krishnamurthy’s approach on Routh criterion on reduced order modelling. The results are simulated in Matlab environment.

A Digital Compensator Design for Electrohydraulic Single-Rod Cylinder Position Control Systems

1990 ◽  
Vol 112 (3) ◽  
pp. 403-409 ◽  
Author(s):  
J. Watton
Keyword(s):  
Control Systems ◽  
Closed Loop ◽  
Position Control ◽  
Open Loop ◽  
Closed Loop System ◽  
Forward Algorithm ◽  
Loop Transfer Function ◽  
Compensator Design ◽  
Feedback Algorithm ◽  
Position Control System

A digital compensator using a forward algorithm, F(z−1), and a feedback algorithm, H(z−1), is developed for an electrohydraulic position control system incorporating an underlapped servovalve and a single-rod cylinder. The main problems encountered with designing such a closed-loop system are discussed, and it is shown how the filter coefficients may be easily determined for a particular class of open-loop transfer function. An excellent comparison between theory and experiment is obtained and it is deduced that one coefficient only need be changed in the forward algorithm for such gain-change dominant systems.

Design and Modelling of a Novel Servovalve Actuated by a Piezoelectric Ring Bender

2015 ◽  
Author(s):  
L. Johan Persson ◽  
Andrew R. Plummer ◽  
Christopher R. Bowen ◽  
Ian Brooks
Keyword(s):  
Mathematical Model ◽  
Closed Loop ◽  
Position Control ◽  
Open Loop ◽  
Closed Loop Control ◽  
Hydraulic Fluid ◽  
Loop Control ◽  
Frequency Responses ◽  
Spool Valve ◽  
The Mathematical Model

This paper describes the design, simulation and testing of a piezoelectric spool valve. An actuator has been connected to the valve and tested under closed loop control. A mathematical model of the valve was produced and a prototype of the valve was tested. The mathematical model is validated against the experimental data. Step and frequency responses for both the valve and actuator are presented. It was found that displacement of the hydraulic fluid by the ring bender had an impact on the valve performance. To reduce the effect of the piezoelectric hysteresis, closed loop spool position control was evaluated. A noticeable difference can be observed between open loop and closed loop performance.

A Servo-Pneumatic Positioning System Driven by Fast Switching On/Off Valves

2011 ◽  
Author(s):  
Cristiano Cardoso Locateli ◽  
Victor Juliano De Negri ◽  
Edson Roberto De Pieri
Keyword(s):  
Pulse Width Modulation ◽  
Test Bench ◽  
Position Control ◽  
Flow Equation ◽  
Experimental Results ◽  
Pneumatic System ◽  
System Control ◽  
Fast Switching ◽  
The Mathematical Model ◽  
Position Control System

This paper discusses the theoretical and experimental results of a position control system using a pneumatic actuator driven by fast switching on/off valves. To begin with, there is a brief introduction about servo-pneumatic systems driven by fast switching valves. Subsequently, the mathematical model of the servo-pneumatic system is discussed involving directional fast switching on/off valves and the flow control valves, modeled according to the mass flow equation based on ISO 6358 and the actuator modeled by Newton’s second law and the continuity equation. The system control is performed through the pulse width modulation (PWM) technique used with a proportional-integrative-derivative (PID) controller. The system performance is analyzed in relation to its application for power control of wind turbines. The simulations of the servo-pneumatic system were carried out by Matlab/Simulink with the experimental results obtained through a test bench.

Electro-Hydraulic Servo Road Simulation System Based on Fuzzy Control

2013 ◽  
Vol 681 ◽  
pp. 214-218
Author(s):  
Da Zhi Huang ◽  
Qing Gui Zhou ◽  
Yuan Liang Zhang ◽  
Jin Song Chen
Keyword(s):  
Fuzzy Control ◽  
Fuzzy Model ◽  
Hydraulic Cylinder ◽  
Displacement Transducer ◽  
Test System ◽  
Simulation System ◽  
Step Response ◽  
Test Results ◽  
Hydraulic Servo ◽  
The Mathematical Model

The indoor road simulation test system test cycle is short, good reproducibility of the test results, confidentiality, etc., more and more attention in the vehicle industry. Analyzed by electro-hydraulic servo system of road simulation servo amplifier, electro-hydraulic servo valve, hydraulic cylinder and countertops and displacement transducer, The mathematical model of the system is established. The fuzzy model that comply with control law is designed. By unit step response simulation experiments, it is to be verified that the fuzzy control electro-hydraulic servo road simulation system is able to work better. It is a new attempt in roads simulation control strategy.

High Precision Rotary Table Used on Milling Machining Centres

2013 ◽  
Vol 371 ◽  
pp. 121-125 ◽  
Author(s):  
Lucian Adrian Mihaila ◽  
Gheorghe Stan ◽  
Claudiu Obreja ◽  
Marius Pascu
Keyword(s):  
High Precision ◽  
Closed Loop ◽  
Position Control ◽  
Rotation Axis ◽  
Rotary Table ◽  
Variable Speed ◽  
Quality Indices ◽  
Positioning Accuracy ◽  
Nominal Size ◽  
Set Up

The latest milling machining centres have in their structure a rotary table which is used for machining up to 5 faces of an workpiece using only one set-up. In order to meet the requirements of an workpiece, that are more and more precise, it is recommended to increase the positioning accuracy of the machine tool table and also the number of indexing points. In this paper we present a new rotary, palletizing table which is provided with 360000 indexing positions and at every 4x90° the indexing precision is ±1``. This solution can be integrated in the structure of milling machining centres which adopt pallets with the nominal size from 400x400 mm to 800x800 mm. The table rotation axis is closed-loop controlled and is actuated by a servomotor with variable speed. The presence of speed and position control in the table`s structure assures the obtaining of high quality indices superior to classic feed systems. The kinematic feed chain has in its structure a duplex worm gear which guarantees the transmission without mechanical clearances. Also the table is provided with a high precision pallet positioning and clamp/unclamp mechanism which attains a position repeatability of ±2``. The advantages of the presented solution find themselves in the general characteristics of the machining centre, providing it with new performances in increasing the precision of the machined workpiece.

Position Control System of a Trunk in an Upward Airflow

2014 ◽  
Vol 657 ◽  
pp. 699-703
Author(s):  
Petru Gabriel Puiu ◽  
Daniel Drilea ◽  
Dragoş Iulian Nedelcu ◽  
Dragoș Andrioaia
Keyword(s):  
Mathematical Model ◽  
Control System ◽  
Physical Model ◽  
Position Control ◽  
Flow Simulations ◽  
Paper Work ◽  
Solid Works ◽  
The Mathematical Model ◽  
Position Control System ◽  
Made In

This paper work presents some aspects of modeling the behavior an object in an upward airflow with possible applications in pneumatic elevators. In the premises known from the literature, was formulated the physical model of corp behavior at air flow varying. In the first stage of the work, was completed in Solid Works the physical model and the functioning simulation in Flow Simulations. The imput data was provided in solving the mathematical model in Matcad 13. To achieve the control system was chose an open sources software solution with SCADA interface made in Pro wiew.

scholarly journals Position control of ball and beam system using robust h∞ loop shaping controller

2020 ◽  
Vol 19 (1) ◽  
pp. 91
Author(s):  
Shahad Sami Ali
Keyword(s):  
Pid Controller ◽  
Position Control ◽  
Open Loop ◽  
Step Response ◽  
Constant Input ◽  
Performance Requirement ◽  
Rolling Ball ◽  
System A ◽  
Matlab Program ◽  
Loop Shaping

<p>Laboratory Ball and Beam prototype (B&amp;B) is a system designed to implement the controlling of space application studies such as aircraft flight and land. In this paper, to control the position of the rolling ball on the beam, MATLAB program will be used to design and implement PID and robust H<sub>∞ </sub>Loop Shaping controllers. The open loop response of the system is unstable, because the ball continuously rolling on the beam when a constant input applied. To stabilize the system, a PID controller used first to achieve the desired position. Then, robust H<sub>∞ </sub>Loop Shaping controller was used to achieve performance requirement for system with uncertainties. Results for the step response shows that robust H<sub>∞ </sub>Loop Shaping controller response have no over shoot, faster about 80 times when compared to step response of PID controller, it's more effective and had better performance compared to other controllers in the control of B&amp;B system.</p>

Sign in / Sign up

Export Citation Format

Share Document