Wyniki wyszukiwania - BazTech

1

The use of digital hydraulic to the position control of hydraulic cylinder

Kucybała P., Sobczyk A.

Journal of KONES

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2016

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Vol. 23, No. 3

297--302

EN

The article presents the method of controlling the position of the hydraulic cylinder using hydraulic valves on/off with an appropriate strategy for digital control. Main elements of the hydraulic system under consideration include a group of electromagnetic hydraulic valves and hydraulic cylinder single acting. The control system was implemented in the environment of the real-time system based on MATLAB/Simulink. The digital control strategy is based on a fast enough on and off switching valves causing corresponding motion of the cylinder to the required position. This article presents the advantages and disadvantages of this type of control about the system with the proportional control system. The accuracy of this kind of control depends on the structure, properties of the valves or their static and dynamic characteristics. The results of analysis of the control system have the possibility of controlling the positioning hydraulic cylinder with a rather high accuracy, which can be used in place of proportional control systems. The use of digital control system allows, under certain conditions to obtain cost savings related to a reduction in energy consumption, to get a much better adaptation to variable control systems. This concept is an interesting alternative for the conventional control system and provides opportunities for application in systems, where conventional control is very expensive e.g. water hydraulics or to the clear systems where the use of hydraulic proportional technique is not necessarily, but depends on the user to the possibility of obtaining good quality control at a relatively low cost.

2

The control system for a manipulator with two degrees of freedom for water hydrostatic transmission drive

Kucybała P., Sobczyk A.

Journal of KONES

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2015

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Vol. 22, No. 3

125--132

EN

The article presents concepts of control of the manipulator with two degrees of freedom, which uses a water hydraulic power unit to drive the actuators. The proposed control system is based on the use of electromagnetically controlled “rosettes valve” and proportional flow control valve. The control system is implemented using a computer equipped with a module for the real-time operating system (XPC Target) working in connection with the environment Matlab/Simulink. Controlled variable of the drive system is the displacement of the individual hydraulic cylinder and after determining manipulator kinematics, any point of the object in operating space. The positioning error of individual manipulator elements will be determined during the test in terms of different control algorithms, using the PID controller and PWM signal. In addition, it analyses the impact of changes in the velocity of the piston rod for the boom mechanism and the arm mechanism. An important aspect of the presented hydrostatic drive system is the use of water as a medium that physical and chemical properties are different from commonly used hydraulic oil, and which is friendly to the environment and meet the high cleanliness requirements for the fluid used to transfer the hydrostatic energy. Therefore, the control system requires a different approach, tied with synchronous control valves ON/OFF and proportional control flow regulators to achieve high accuracy.

3

The wireless hydrostatic transmission control by the use of mobile technology

Kucybała P., Pobędza J., Sobczyk A.

Journal of KONES

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2014

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Vol. 21, No. 2

169--175

EN

The paper presents the concept of a new approach for remote control and monitoring of parameters of mobile or stationary machines in real time on the example of the hydrostatic transmission drive test stand. The proposed system control and monitoring is the mobile system which is closely related with the three applications written in a different programming languages, such as: java (Android) – mobile application runs on the tablet, C language – server application joins xPC Target with tablet, PHP – admin panel to manage mobile control platform. Controlling of the hydrostatic drive stand is implemented using an application installed on the tablet. This application is connected with computer’s real-time (xPC Target) module, generated in Matlab. The computer with xPC Target is equipped with a measuring-control card, to which the control signals are transmitted. This hardware-software component plays the connecting role between machine and operator of the mobile platform installed on the tablet. The application allows observe important parameters such as pressure, volumetric flow rate, temperature, velocity, torque in real-time, as well as, it enable, by use of special graphic slider on the tablet’s screen, to set control parameters such as: speed of electric motor, the opening and switching positions of the directional valve, as well as, setting the load by pressure relief valve. Based on this system research related to the verification of system operation were performed for different setting of the hydrostatic transmission drive speed controller, and selected results are presented in the paper.

4

Rozproszony system sterowania czasu rzeczywistego do serwonapędów płynowych

Dindorf R., Łaski P., Takoshoglu J., Woś P.

Czasopismo Techniczne. Mechanika

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2011

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R. 108, z. 4-M/1

43-48

PL

W artykule przedstawiono koncepcję rozproszonego systemu sterowania czasu rzeczywistego do serwonapędów płynowych. Zaproponowany rozproszony system sterowania składa się z dwóch komputerów: Target PC i Host PC. Komputer Target PC stanowi warstwę sterowania bezpośredniego i połączony jest z obiektem regulacji - serwonapędem płynowym. Komputer Host PC stanowi warstwę sterowania nadrzędnego oraz pełni rolę operatora w stosunku do sterowania bezpośredniego. Na podstawie rozproszonego systemu sterowania czasu rzeczywistego zaprojektowano regulator rozmyty do serwonapędu pneumatycznego oraz regulator adaptacyjny do serwonapędu hydraulicznego.

EN

The paper deals with distributed real-time control systems for fluid power servo-driver. The proposed distributed control systems consists of two computers Target PC and Host PC where the first computer directly controls the pneumatic servo-drive and is connected to controlled systems - fluid power driver while the second functions as the operator towards the direct control layer. On the basis of the distributed real-time control system the fuzzy logic controller for electro-pneumatic servo-drive and adaptive controller for electro-hydraulic servo-drive were designed.