Selection of Operating Modes of a Multi-Functional Hydraulic Device

2005 ◽  
Author(s):  
Amir Shenouda ◽  
Wayne J. Book
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Hydraulic System ◽  
Force Feedback ◽  
New Technology ◽  
Hydraulic Cylinder ◽  
Hydraulic Control ◽  
Operating Modes ◽  
Machine Productivity ◽  
Spool Valve

The field of earth moving equipment is experiencing a transformation due to the introduction of more electronic control capability and advanced control concepts. Conventional hydraulic control systems are controlled by proportional directional spool valve. The construction of the spool valve is such that a given position of the spool determines the flow in and the flow out restriction sizes. Thus, metering in and metering out are dependent or coupled. A certain restriction size on the inlet corresponds to a certain restriction size on the outlet. Therefore, we have one degree of freedom. It can provide for good motion control but it cannot achieve energy saving potential at the same time. In this paper, the concept of ‘independent meter in / meter out’ will be emphasized. Decoupling of meter in from meter out provides for more controllability and potential for energy saving in overrunning load cases when compared with a conventional spool valve controlled hydraulic system. A four-valve configuration controlling a hydraulic cylinder will be stressed. The four-valve configuration can operate in several modes because each of the four valves is controlled separately from the others. Five of these metering modes will be pointed out; two conventional modes and three regenerative modes. An industry system supplier has introduced a novel distributed independent metering in/meter out hydraulic system with actuator force feedback. This control system is going to presented in brief. The distributed, actuator mounted implementation of this system maximizes the efficiency of the regeneration flow by minimizing the line losses associated with the recirculating fluid This control system can be used to control a multi-functional hydraulic device, e.g. excavators, tractor loader backhoes, etc... An experiment was done where a typical dig cycle was performed by a tractor loader backhoe equipped with this new technology. The data recorded from this experiment is used to perform an off-line optimization of metering modes selection for each function during the cycle. this off-line optimization can be used to maximize machine productivity or machine efficiency or a weighted combination of both. A general objective function will be presented and results will be given for maximizing machine productivity. Finally conclusions and future work suggestions are presented.

Study Control System Based on Creep Test in High Density Baler

2010 ◽  
Vol 139-141 ◽  
pp. 1624-1627
Author(s):  
Wei Lee ◽  
Chun Guang Wang
Keyword(s):  
Control System ◽  
Data Acquisition ◽  
Creep Test ◽  
Hydraulic System ◽  
Electrical Contact ◽  
Hydraulic Cylinder ◽  
High Density ◽  
Hydraulic Control ◽  
Creep Tests ◽  
Relief Valve

Hydraulic transmission system controls hydraulic cylinder forward and backward movement freely, in order to achieve high density hydraulic baler work circulation. Creep test required hydraulic system to output constant stress, and study creep tests can not be completed when used succeeding the electrical contact style in the past time. The system used programmable logic controller (PLC) to instead of succeeding the electrical contact style and realized freely forward and backward movement of hydraulic cylinder, electro-hydraulic proportional relief valve can adjust hydraulic system and make it stepless pressure regulation and then degree of automation and reliability in hydraulic control system to be improved. This paper introduces aspects: including the selection, hardware configuration and program of PLC, meanwhile, giving specific realization method. Through the control system to study creep test in hydraulic baler, adopting the National Instrument (NI) company's multi-channel data acquisition card, which type is USB-6251,applying Labview8.2 to write data acquisition program on my own, the versatility and flexibility of system was verified, which was able to complete creep test successfully.

Paper 6: Hydraulic Control of Valves in Tankers

1965 ◽  
Vol 180 (12) ◽  
pp. 121-131
Author(s):  
Victor Pomper
Keyword(s):  
Control System ◽  
Remote Control ◽  
Hydraulic Cylinder ◽  
Free Flow ◽  
Centralized Control ◽  
Hydraulic Control ◽  
Level Indicator ◽  
Control Valves ◽  
Directional Control ◽  
Oil Tanker

The 47 800-ton vessel Altair of the Compagnie Navale des Pétroles (C.N.P.) was the first oil-tanker to be equipped with a hydraulic remote-control system of cargo valves. The vessel was delivered at the beginning of May 1959. The opening and closing operations of the valves were controlled from a central panel which was fitted with manually operated directional control valves. The panel was located in the cargo valves' remote-control room which also housed the indispensable remote-controlled level-indicator board. Since then the application of hydraulic remote-controlled valves has become widespread and has taken one of two forms : that of a centralized control system or that of directional control valves located on the deck. Remote-controlled valves are either gate valves operated by a hydraulic cylinder, or butterfly valves operated by a hydraulic rotary actuator. The application of remote-control also allowed the setting up of the ‘free-flow’ system which uses hydraulically operated bulkhead valves. The first ‘free-flow’ oil-tanker was the Sirius of the C.N.P.; it was delivered in 1961. At present it appears that there exists an ever-increasing trend towards automation in the loading and unloading of tanker cargoes. This is accomplished by electrically operated directional control valves, which are connected with electrically programmed systems or with electronic servo-controls.

Modeling and Simulation Research of Hydraulic Cylinder Speed Control System Based on High-Speed On-Off Valve

2012 ◽  
Vol 590 ◽  
pp. 161-164
Author(s):  
Qin He Gao ◽  
Wen Liang Guan ◽  
Hai Zhou Song ◽  
Zhi Yong Yang
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
High Speed ◽  
Speed Control ◽  
Hydraulic Cylinder ◽  
Simulation Research ◽  
Parallel Application ◽  
Proposed Model ◽  
Speed Control System ◽  
Small Flow

Application of high-speed on-off valve in the hydraulic cylinder speed control system was researched in this paper. Series and parallel application schemes between high-speed on-off valve and hydraulic cylinder are proposed. Model of high-speed on-off valve and hydraulic circuit were established to carry out simulation. The speed and acceleration curve of hydraulic cylinder were achieved by the means of simulation with Simulink. The simulation curves show that, two application schemes can both control the speed of hydraulic cylinder effectively. Series application scheme can be only applied to small flow hydraulic system; parallel application scheme has wider application.

The Kinematic and Dynamic Analysis of Hydraulic Control System Based on the Lagrangian Force Method

2018 ◽  
Vol 15 (05) ◽  
pp. 1850041
Author(s):  
Thi-Na Ta ◽  
Cao-Sang Tran ◽  
Yunn-Lin Hwang
Keyword(s):  
Control System ◽  
Dynamic Analysis ◽  
Hydraulic System ◽  
Lagrange Equation ◽  
Control Parameters ◽  
Hydraulic Control ◽  
Hydraulic Systems ◽  
Dynamical Parameters ◽  
Characteristic Effect ◽  
Hydraulic Control System

In this paper, the hydraulic control system design and dynamic analysis are considered in superior calculation efficiency based on Lagrangian method and fundamental laws for getting control algorithms to investigate about hydraulic system how to control hydraulic system and take hydraulic controller to the optimization. The systems built in dynamical parameters are associated hydraulic control system achieved with control parameters. And then, an interface is achieved. The relations between control parameters are obtained. The numerical tools are going to determine all kinematic parameters of bodies such as displacement, velocities, accelerations as well as reaction forces are responded. The AMESim and RecurDyn are used such Computer Aided Engineering (CAE) techniques to solve the numerical examples in this paper. Those examples will imply that the equation of motion based on Euler–Lagrange equation and characteristic effect of force is executable. Through results, we could achieve control improvement at different hydraulic systems.

Research and Development of the Hydraulic Cylinder Control System on FIX

2011 ◽  
Vol 339 ◽  
pp. 167-170
Author(s):  
Chun Mei Wang ◽  
Hong Li ◽  
Shi Qiang Zhou ◽  
Chun Hua Xie
Keyword(s):  
Control System ◽  
Research And Development ◽  
Data Processing ◽  
Hydraulic System ◽  
Hydraulic Cylinder ◽  
Industrial Control ◽  
Speed And Accuracy

In this article, making use of FIX industrial control soft, introduce the test principle signal data processing and property analyzing of the hydraulic cylinder by the help of the computer.It has greatly enhanced the speed and accuracy of detection for hydraulic components and hydraulic system, and also given a promise to assure the design and maintenance successfully.

Design and Analysis of the Low-Speed Hydraulic Control System of 3.15MN Forging Press

2013 ◽  
Vol 690-693 ◽  
pp. 2210-2217
Author(s):  
Yi Bo Li ◽  
Ming Hui Huang ◽  
Qing Pan ◽  
Min Chen
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Hydraulic Press ◽  
System Structure ◽  
Hydraulic Control ◽  
Low Speed ◽  
Hydraulic Theory ◽  
Forging Press ◽  
The Mathematical Model ◽  
Hydraulic Control System

A low speed hydraulic control system applying to 3.15MN forging press isdesigned for isothermal forging processes. Based on the hydraulic theory andthe system structure, both the mathematical model and the simulation model ofthe hydraulic press are established with its features discussed. PID controlmethod is adopted and genetic algorithm is used to automatically tune theparameters of the controller to deal with nonlinearity and time-variant of thecontrolled plant. Co-simulation of the control system and hydraulic system isestablished to verify the feasibility of the design. It is proved by anisothermal forging of a turbine disc that the system has good performances andcan achieve an ultra speed control in the end.

Design and Analysis of Hydraulic Control System for Pipe Storage and Handling System

2011 ◽  
Vol 480-481 ◽  
pp. 1240-1245
Author(s):  
Yu Wang ◽  
Bao Lin Liu ◽  
Yuan Biao Hu
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Hydraulic Pressure ◽  
Hydraulic Control ◽  
Round Trip ◽  
Handling System ◽  
Piston Speed ◽  
Valve Operation ◽  
Hydraulic Control System ◽  
Pipe Joint

This paper research the hydraulic control system of pipe storage and handling system. The pipe storage and handling system (PSHS) is the key parts on rig to handle the drilling pipe and it can improve the efficiency during the drilling works. The hydraulic system of pipe storage and handling system have designed according to automatic round-trip operation in drilling engineering. The mathematical modeling of hydraulic components in PSHS have established and analyzed. The simulation model of hydraulic system of PSHS is also built and simulated to analysis the characteristics of reversal valve operation, Hydraulic pressure adjusting operation, piston speed control and state of accumulator based on the AMESim. The results prove that the operations of pipe storage and handle such as pipe storage, pipe clamping, pipe lifting, pipe transfer and pipe joint can be accomplished drive by hydraulic system. Meanwhile, AMESim have great views to research the geosciences equipment.

Simulation Experiment of Roll Bending Machine in Valveless Servo System

2012 ◽  
Vol 619 ◽  
pp. 410-414 ◽  
Author(s):  
Yang Cao ◽  
Xiao Yan Tian ◽  
Guo Qing Wu ◽  
Qiao Mei Li ◽  
Yan Hua Wu
Keyword(s):  
Hydraulic System ◽  
High Efficiency ◽  
Simulation Experiment ◽  
Control Strategies ◽  
New Technology ◽  
Servo System ◽  
Research Direction ◽  
Hydraulic Control ◽  
Main Research ◽  
Roll Bending

Valveless servo system is a new technology which is widely used in recent years. Compared to the traditional hydraulic system, valveless servo system has a lot of advantages such as high efficiency, less pollution and saving energy, which will be the main research direction of the hydraulic control in the future. Roll bending machine is a large industrial machine, but the efficiency of existing hydraulic system of roll bending machine is low and the cost of maintenance management is high. Applying valveless system on roll bending machine can overcome these defects. This paper made a study of the control strategies which were about valveless servo system on roll bending machine. And software MATLAB was used to do simulation experiment on valveless servo system. This paper summarized the steady-state error and dynamic characteristics according to output signals in different input signals.

Design of Hydraulic Cylinder Speed Control System Base on High-Speed on-Off Valve

2012 ◽  
Vol 220-223 ◽  
pp. 1661-1664
Author(s):  
Qin He Gao ◽  
Wen Liang Guan ◽  
Hai Zhou Song ◽  
Zhi Yong Yang
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
High Speed ◽  
Speed Control ◽  
Hydraulic Cylinder ◽  
Pulse Control ◽  
Parallel Application ◽  
Speed Control System ◽  
Small Flow ◽  
The Impact

In order to study the Application of high-speed on-off valve in the hydraulic cylinder speed control system, series and parallel application schemes between high-speed on-off valve and hydraulic cylinder are proposed to control the speed of hydraulic cylinder. The duty cycle of pulse control signal was changed according to the displacement of hydraulic cylinder to control the speed of hydraulic cylinder and weak the impact. The simulation curve compared with the experimental results show that, two application schemes can both control the speed of hydraulic cylinder effectively. Series application scheme can be only applied to small flow hydraulic system; parallel application scheme has wider application.

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