Hydraulic Control of Speed and Position of a Pneumatic Actuator

2015 ◽  
Vol 772 ◽  
pp. 334-338
Author(s):  
Mihai Avram ◽  
Constantin Bucşan ◽  
Despina Duminică ◽  
Dana Rizescu ◽  
Daniel Besnea
Keyword(s):  
Mathematical Model ◽  
Numerical Simulations ◽  
Hydraulic System ◽  
Experimental Results ◽  
Pneumatic Actuator ◽  
Hydraulic Control ◽  
Hydraulic Circuit

The paper presents an original pneumo-hydraulic system that controls the speed and the position of the actuated load by using a hydraulic circuit containing a hydraulic proportional throttle. A mathematical model of the solution is developed and numerical simulations are performed. The experimental results obtained on the built model confirm the theoretical ones.

Optimization Design for MA5300 Injection Molding Machine’s Clamping Unit’s Hydraulic System

2013 ◽  
Vol 321-324 ◽  
pp. 1770-1774
Author(s):  
Jing Wang ◽  
Zheng Cai Wang ◽  
Li Ying Xue ◽  
Li Zhu Liu
Keyword(s):  
Injection Molding ◽  
Hydraulic System ◽  
Optimization Design ◽  
Response Speed ◽  
Control Circuit ◽  
Hydraulic Control ◽  
Hydraulic Circuit ◽  
Magnetic Exchange ◽  
Oil Source

Focusing on PET perform molding features, working principles of MA5300 Injection Molding Machine’s clamping unit’s hydraulic system has been analyzed in this paper. Based on previous hydraulic system, magnetic exchange valve has been added on the demoulding hydraulic circuit, demolding speed has been fastened; energy accumulator has been added on the control circuit so as to stabilize controlled oil-source, improve time of opening and clamping mould and response speed. In addition, common one-way valve in core oil circuit is replaced with hydraulic control one-way valve, in order to realize pressure maintaining function; hydraulic insurance structure is changed into inner circulation, and two-way cartridge valve is used as security valve, so as to realize faster response, and largely improved equipment security. Through adopting common hydraulic components, under the premise of limited increasing cost, the injection molding cycle for PET perform product has been reduced, and enterprise’s productivity has been improved.

Simulation Research on the Influence of Oil Damping to the Effect of Assimilating Impulsion Based on Accumulator

2011 ◽  
Vol 228-229 ◽  
pp. 332-339
Author(s):  
Qing Nie ◽  
Hong Nie ◽  
Ming Zhang
Keyword(s):  
Dynamic Model ◽  
Hydraulic System ◽  
General Function ◽  
Hydraulic Control ◽  
Hydraulic Circuit ◽  
Simulation Research ◽  
Throttle Valve ◽  
Simulation Results ◽  
Different Diameters ◽  
Sudden Load

The general function library and hydraulic control library of EASY5 software were used to establish the dynamic model of hydraulic system of a sudden load, which could assimilate impulsion based on accumulator. The system was simulated with different diameters of the oil supply hole of accumulator. The simulation results were compared and analyzed to research the influence of oil damping to the effect of assimilating impulsion based on accumulator. From the simulation results, a hydraulic circuit consists of a throttle valve controlled by pressure and an accumulator was put forward to improve the capacity of accumulator to assimilate impulsion by changing the oil damping of accumulator through throttle valve, which had certain of meaning in project.

Analysis of a Three-Phase Pulsating Flow Hydraulic System

1978 ◽  
Vol 5 (1) ◽  
pp. 24-30
Author(s):  
Y.M. EI-Ibiary ◽  
P.R. Ukrainetz ◽  
P.N. Nikiforuk
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Low Pressure ◽  
Area Ratio ◽  
Pulsating Flow ◽  
Experimental Results ◽  
Hydraulic Control ◽  
Three Phase ◽  
Hydraulic Control System

An analysis is presented of a three-phase pulsating flow hydraulic control system. Such a system consists of five basic components – an alternator, transformers, rectifiers, a compensator and high and low pressure accumulators. In carrying out this analysis, it is assumed that there is no leakage, the fluid is incompressible, the transformer area ratio is unity and the transformers and check valves of the rectifier unit are symmetric. Some typical simulation and experimental results are included.

scholarly journals Mathematical modeling and experiment for hydraulic ejecting system of ceramic brick press

2021 ◽  
Vol 2079 (1) ◽  
pp. 012026
Author(s):  
HongBo Zheng ◽  
MingJun Li ◽  
QingQing Bian
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Theoretical Basis ◽  
Hydraulic System ◽  
Experimental Results ◽  
Ceramic Brick ◽  
Working Principle ◽  
The Mathematical Model

Abstract Taking the ejecting system of hydraulic system of 7200t ceramic brick press as the research object, the basic constitution and working principle of the hydraulic ejecting system are described, and its mathematical model is established and calculated. In order to verify the accuracy of the mathematical model, the experiment was carried out, and the experimental results were compared with the calculated according to the mathematical model. The two results were basically consistent, indicating that the mathematical model is accurate, and providing a theoretical basis for further research on the ceramic brick press.

scholarly journals ALGORITHM OF CONTROLLING AN ADAPTIVE HYDRAULIC CIRCUIT FOR MOBILE MACHINES

2021 ◽  
Vol 13 (3) ◽  
pp. 79-86
Author(s):  
Leonid Kozlov ◽  
◽  
Yurii Buriennikov ◽  
Oana Rusu ◽  
Volodymyr Pyliavets ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Hydraulic System ◽  
Hydraulic Systems ◽  
Hydraulic Circuit ◽  
Nonlinear Mathematical Model ◽  
Rosenbrock Method ◽  
Soil Hardness ◽  
Loose Soil ◽  
Feed Value ◽  
The Mathematical Model

Hydraulic systems based on adjustable pumps, proportional electrohydraulic equipment and controllers are used in mobile machines. The authors propose a new scheme of the hydraulic system for mobile machines, which provides the auger drilling operation. A number of studies have shown that a certain ratio should be maintained between the frequency of auger rotation and its feed during operation, where the productivity of soil disruption should not exceed the productivity of transporting loose soil from the drilling zone. Ensuring the required ratio between the speed of the auger rotation and its feed is implemented by a controller that works according to a certain algorithm. A nonlinear mathematical model of the hydraulic system was developed to create the algorithm for controller operation and setting. The equations of the mathematical model are solved in the MATLAB-Simulink environment by the Rosenbrock method. As a result of solving the equations for the mathematical model, the dependences of variables describing the state of the hydraulic system on time are obtained. The values of the controller settings are determined at which the hydraulic system works steadily, the error of flow rate stabilization, the time for pressure adjustment and readjustment does not exceed the allowable values. The algorithm for controlling the auger feed value is formed. This algorithm provides the necessary ratio between the auger feed and speed, as well as reducing the feed rate in the case of soil hardness increases. This creates the conditions for uninterrupted pit drilling at full depth and protection of the hydraulic system from overload.

scholarly journals Simulation of parallel capacitance influence on the hydraulic system dynamics

2019 ◽  
Vol 213 ◽  
pp. 02016
Author(s):  
Dýrr Filip ◽  
Hružík Lumír ◽  
Bureček Adam ◽  
Brzezina Petr
Keyword(s):  
Mathematical Model ◽  
System Dynamics ◽  
Mathematical Simulation ◽  
Experimental Measurement ◽  
Hydraulic System ◽  
Stationary Flow ◽  
Pressure Response ◽  
Hydraulic Circuit

This paper covers with experimental measurement and mathematical simulation of parallel capacitance influence on pressure response for non-stationary flow. The hydraulic circuit for measuring required quantities, which are necessary to determine of parallel capacitance influence on the hydraulic system dynamics. A part of hydraulic system is a long pipe, in which the parallel capacitance created by hydraulic hose is connected. A non-stationary flow is caused by fast closing of the seat valve, which is situated at the end of long pipe. Mathematical model is realized and verified in Matlab SimScape Fluids software for this hydraulic system.

scholarly journals Volterra–Lyapunov Stability Analysis of the Solutions of Babesiosis Disease Model

Symmetry ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1272
Author(s):  
Fengsheng Chien ◽  
Stanford Shateyi
Keyword(s):  
Mathematical Model ◽  
Stability Analysis ◽  
Global Stability ◽  
Numerical Simulations ◽  
Lyapunov Stability ◽  
Disease Model ◽  
Transmission Dynamics ◽  
Global Stability Analysis ◽  
Lyapunov Stability Analysis ◽  
Disease Free

This paper studies the global stability analysis of a mathematical model on Babesiosis transmission dynamics on bovines and ticks populations as proposed by Dang et al. First, the global stability analysis of disease-free equilibrium (DFE) is presented. Furthermore, using the properties of Volterra–Lyapunov matrices, we show that it is possible to prove the global stability of the endemic equilibrium. The property of symmetry in the structure of Volterra–Lyapunov matrices plays an important role in achieving this goal. Furthermore, numerical simulations are used to verify the result presented.

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