Modelling the Performance Characteristics of a Hydraulic Load Control Valve PDF Download
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Author: Steven Thomas Weber
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Steven Thomas Weber
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Nicolae Vasiliu
Publisher: CRC Press
ISBN: 1351645161
Category : Science
Languages : en
Pages : 761
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Book Description
This book illustrates numerical simulation of fluid power systems by LMS Amesim Platform covering hydrostatic transmissions, electro hydraulic servo valves, hydraulic servomechanisms for aerospace engineering, speed governors for power machines, fuel injection systems, and automotive servo systems It includes hydrostatic transmissions, automotive fuel injection, hydropower speed units governor, aerospace servo systems along with case studies of specified companies Aids in predicting and optimizing the static and dynamic performances related to the systems under study
Author: Jerry Boza
Publisher:
ISBN:
Category : Automatic control
Languages : en
Pages : 113
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Book Description
Electro-hydraulic pressure-control valves are used in many applications, such as manufacturing equipment, agricultural machinery, and aircrafts to name a few. They are often used to actuate hydraulic clutches, such as those found in power shift transmissions. A traditional pressure-control valve with open-loop control algorithm is typically used in clutch applications. This scheme often results in inconsistent or undesirable system behavior due to the nature of open-loop control as well as the nonlinear system dynamics and uncertainties. In this research two new electro-hydraulic pressure-control valves were designed in order to decouple the valve and control port (hydraulic) dynamics. This was achieved by removing the regulated pressure balancing force utilized in traditional pressure-control valves. Different closed-loop controllers were designed and tested in parallel in order to achieve the desired steady-state and dynamic regulated pressure response. A nonlinear dynamic model was developed for each valve then used to compare the performance characteristics of the valves. Linear analysis was performed and various control techniques were studied from classical PID control to modern optimal control. The model was also used to predict performance of the closed-loop controllers prior to experimental testing and to validate experimentally tuned controllers afterwards. Prototype valves were fabricated in order to validate the model and to test the controller designs experimentally. Different valve and controller combinations were compared to a traditional pressure-control valve utilizing open-loop control through typical industry performance tests. This study found that a valve with a traditional pressure-control pilot and a main stage spool with no pressure balancing force, along with a gain scheduled PID controller, outperformed the traditional valve in all areas tested. This approach is also feasible within the existing infrastructure of most applications where the benchmark traditional valve is currently used.
Author: Awni Alshakhshir
Publisher: LAP Lambert Academic Publishing
ISBN: 9783843383776
Category :
Languages : en
Pages : 276
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Book Description
The work presented in this book describes the specific steps undertaken to design and test two spool type control valves that will be part of Amsted Rail s innovative vertical hydraulic damper system. The design challenge lies in the requirement that these spool valves must maintain a linear relation between pressure drop, flow rate, and position, during the extension and retraction cycles of the hydraulic damper. To this end, a series of laboratory experiments were conducted on spools having different land geometries in order to acquire the optimum apertures that will produce the desired performance based on simulation data provided by Amsted Rail. The effect of the working fluid temperature on the performance of the two designed spool valves was also investigated. Experimental testing was successful in identifying two spool valves that meet the provided design criteria within 2% for AW46 hydraulic oil working fluid at a temperature of 25°C (77°F).
Author: Vernon D. Gebben
Publisher:
ISBN:
Category : Hydraulic control
Languages : en
Pages : 40
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Book Description
Author: Mohieddine Jelali
Publisher: Springer Science & Business Media
ISBN: 1447100999
Category : Technology & Engineering
Languages : en
Pages : 380
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Book Description
This up-to-date book details the basic concepts of many recent developments of nonlinear identification and nonlinear control, and their application to hydraulic servo-systems. It is very application-oriented and provides the reader with detailed working procedures and hints for implementation routines and software tools.
Author: K. Warren Frizell
Publisher:
ISBN:
Category : Cavitation
Languages : en
Pages : 28
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Book Description
Author: J. Watton
Publisher: Cambridge University Press
ISBN: 0521762502
Category : Science
Languages : en
Pages : 509
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Book Description
This is an undergraduate text/reference for applications in which large forces with fast response times are achieved using hydraulic control.
Author: Edwin Bernard Gentry
Publisher:
ISBN:
Category : Faucets
Languages : en
Pages : 232
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Book Description
Author: Matthew Muller
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages :
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Book Description
This research explores valve design, dynamic modeling, and techniques to achieve flow control for a forced-feedback metering poppet valve system. In particular, nonlinear and linear models of a forced feedback configuration are developed and tuned through the use of root locus techniques. Typical steady state conditions as well as extreme high and low pressure drops are simulated in attempts to uncover instabilities and other possible undesirable performance characteristics of the valve. It is shown that by using a variable inlet orifice to the control volume as opposed to a constant orifice, desired system bandwidth and stability can be achieved. Open loop valve designs are then simulated with several electronic control schemes which incorporate feedback of load pressure and in some cases valve flow. An observer design is investigated as a means of providing flow feedback without additional sensor costs. Electronic flow control schemes are compared to standard mechanical pressure compensation and finally a robust analysis is provided for a chosen electronic control scheme.
