A Study Of The Stability Of A Hydraulic Actuator System
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A Study Of The Stability Of A Hydraulic Actuator System
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Author : Paul A. Stoelting
language : en
Publisher:
Release Date : 1999
A Study Of The Stability Of A Hydraulic Actuator System written by Paul A. Stoelting and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Actuators categories.
Hydraulic Actuator Force Control
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Author : Masoumeh Esfandiari
language : en
Publisher:
Release Date : 2016
Hydraulic Actuator Force Control written by Masoumeh Esfandiari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The Dynamics And Stability Of An Electro Hydraulic Actuator System
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Author : Craig Andrew Hennings
language : en
Publisher:
Release Date : 1994
The Dynamics And Stability Of An Electro Hydraulic Actuator System written by Craig Andrew Hennings and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Design Of A Hydraulic Actuator Test Stand For Non Linear Analysis Of Hydraulic Actuator Systems
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Author :
language : en
Publisher:
Release Date : 2001
Design Of A Hydraulic Actuator Test Stand For Non Linear Analysis Of Hydraulic Actuator Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Stability is imperative in the design of hydraulic systems. Servo-hydraulic systems are inherently non-linear creating various nuances when analyzing the stability of the system. Friction, port flow, saturation, impact loading, line dynamics, and boundary conditions are a few of the many non-linearities found in servo-hydraulic systems which are to be analyzed using advanced non-linear stability analysis techniques. Some effects of instabilities induced by non-linearities such as pressure oscillations, noise, etc., can be detrimental to the stability or operation of hydraulic systems especially when the design is near the envelope of stability. This thesis presents preliminary research on the various non-linearities found in hydraulic systems. A test stand has been developed to test the hydraulic cylinder system dynamics, with the inclusion of a mass-spring-damper system. An experimental modal analysis was performed on the hydraulic test stand to provide helpful information regarding the natural frequencies of the structure to insure that these frequencies do not lie near the natural frequencies of the hydraulic systems. Initial non-linear dynamic testing was completed on two hydraulic cylinders, consisting of finding the breakaway friction forces of the hydraulic cylinders.
Nonlinear Control Techniques For Electro Hydraulic Actuators In Robotics Engineering
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Author : Qing Guo
language : en
Publisher: CRC Press
Release Date : 2017-08-14
Nonlinear Control Techniques For Electro Hydraulic Actuators In Robotics Engineering written by Qing Guo and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-08-14 with Technology & Engineering categories.
Nonlinear Control Techniques for Electro-Hydraulic Actuators in Robotics Engineering meets the needs of those working in advanced electro-hydraulic controls for modern mechatronic and robotic systems. The non-linear EHS control methods covered are proving to be more effective than traditional controllers, such as PIDs. The control strategies given address parametric uncertainty, unknown external load disturbance, single-rod actuator characteristics, and control saturation. Theoretical and experimental validations are explained, and examples provided. Based on the authors' cutting-edge research, this work is an important resource for engineers, researchers, and students working in EHS.
Mobile Working Hydraulic System Dynamics
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Author : Mikael Axin
language : en
Publisher: Linköping University Electronic Press
Release Date : 2015-09-07
Mobile Working Hydraulic System Dynamics written by Mikael Axin and has been published by Linköping University Electronic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-09-07 with Hydraulic engineering categories.
This thesis deals with innovative working hydraulic systems for mobile machines. Flow control systems are studied as an alternative to load sensing. The fundamental difference is that the pump is controlled based on the operator’s command signals rather than feedback signals from the loads. This control approach enables higher energy efficiency and there is no load pressure feedback causing stability issues. Experimental results show a reduced pump pressure margin and energy saving potential for a wheel loader application. The damping contribution from the inlet and outlet orifice in directional valves is studied. Design rules are developed and verified by experiments. A novel system architecture is proposed where flow control, load sensing and open-centre are merged into a generalized system description. The proposed system is configurable and the operator can realize the characteristics of any of the standard systems without compromising energy efficiency. This can be done non-discretely on-the-fly. Experiments show that it is possible to avoid unnecessary energy losses while improving system response and increasing stability margins compared to load sensing. Static and dynamic differences between different control modes are also demonstrated experimentally.
Stability And Stabilization Of Linear Systems With Saturating Actuators
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Author : Sophie Tarbouriech
language : en
Publisher: Springer Science & Business Media
Release Date : 2011-08-13
Stability And Stabilization Of Linear Systems With Saturating Actuators written by Sophie Tarbouriech and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-08-13 with Technology & Engineering categories.
This monograph details basic concepts and tools fundamental for the analysis and synthesis of linear systems subject to actuator saturation and developments in recent research. The authors use a state-space approach and focus on stability analysis and the synthesis of stabilizing control laws in both local and global contexts. Different methods of modeling the saturation and behavior of the nonlinear closed-loop system are given special attention. Various kinds of Lyapunov functions are considered to present different stability conditions. Results arising from uncertain systems and treating performance in the presence of saturation are given. The text proposes methods and algorithms, based on the use of linear programming and linear matrix inequalities, for computing estimates of the basin of attraction and for designing control systems accounting for the control bounds and the possibility of saturation. They can be easily implemented with mathematical software packages.
Digital Hydraulic Actuator Study
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Author : INTERNATIONAL BUSINESS MACHINES CORP OWEGO NY.
language : en
Publisher:
Release Date : 1964
Digital Hydraulic Actuator Study written by INTERNATIONAL BUSINESS MACHINES CORP OWEGO NY. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with categories.
The progress is reported on the Digital Hydraulic Actuator (DHA) Study as related to a Polaris application. The purpose of the DHA Phase I Study is to establish and define the pertinent parameters which impact control system performance with Polaris as a study vehicle. If the DHA can be shown to provide suitable performance characteristics as a substitute for a continuous elec tro-hydraulic actuator servo there are some compelling reasons for considering it in many aerospace applications. These reasons include greater mechanical and electrical simplicity, elimination of D/A conversion in systems emitting digital steering commands, and performance of autopilot functions in the central data processor. Two basic study techniques have been employed; one for the purpose of establishing the stability margins as functions of sampling rate and the other for evaluating non-linear device effects in the time domain. In order to study stability margins as a function of sampling rate it has been necessary to generate a perturbed missile model at maximum q the most difficult control point. This is for the purpose of being conservative in DHA requirements evaluation in Polaris. (Author).
Hydraulic Control Systems
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Author : Noah D. Manring
language : en
Publisher: John Wiley & Sons
Release Date : 2019-09-24
Hydraulic Control Systems written by Noah D. Manring and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-09-24 with Technology & Engineering categories.
Provides key updates to a must-have text on hydraulic control systems This fully updated, second edition offers students and professionals a reliable and comprehensive guide to the hows and whys of today's hydraulic control system fundamentals. Complete with insightful industry examples, it features the latest coverage of modeling and control systems with a widely accepted approach to systems design. The book also offers all new information on: advanced control topics; auxiliary components (reservoirs, accumulators, coolers, filters); hybrid transmissions; multi-circuit systems; and digital hydraulics. Chapters in Hydraulic Control Systems, 2nd Edition cover; fluid properties; fluid mechanics; dynamic systems and control; hydraulic valves, pumps, and actuators; auxiliary components; and both valve and pump controlled hydraulic systems. The book presents illustrative case studies throughout that highlight important topics and demonstrate how equations can be implemented and used in the real world. It also features end-of-chapter exercises to help facilitate learning. It is a powerful tool for developing a solid understanding of hydraulic control systems that will serve all practicing engineers in the field. Provides a useful review of fluid mechanics and system dynamics Offers thorough analysis of transient fluid flow forces within valves Adds all new information on: advanced control topics; auxiliary components; hybrid transmissions; multi-circuit systems; and digital hydraulics Discusses flow ripple for both gear pumps and axial piston pumps Presents updated analysis of the pump control problems associated with swash plate type machines Showcases a successful methodology for hydraulic system design Features reduced-order models and PID controllers showing control objectives of position, velocity, and effort Hydraulic Control Systems, 2nd Edition is an important book for undergraduate and first-year graduate students taking courses in fluid power. It is also an excellent resource for practicing engineers in the field of fluid power.
Stability Analysis And Design Of Servo Hydraulic Systems
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Author : Amit Shukla
language : en
Publisher:
Release Date : 2002
Stability Analysis And Design Of Servo Hydraulic Systems written by Amit Shukla and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.
Design for robust stability is one of the most important issues in nonlinear systems theory. The validity of linear system design in a small neighborhood is not a sufficient criterion for systems that undergo parametric variations and have strong nonlinear characteristics. With rapid growth in the systems theory, the design of nonlinear systems using bifurcation theory-based procedures has been one of the key developments. Servo-hydraulic systems are one of the most commonly used actuation and control devices, due to their force to weight ratio. They also are highly nonlinear in nature and hence provide considerable difficulty in the design and analysis of these systems and their control algorithms. The goal of this dissertation is to tackle some of the issues of the nonlinear systems theory with applications to servo-hydraulic systems. The use of bifurcation theory for the design and analysis of a nonlinear system is illustrated, and a detailed investigation into the dynamics associated with the servo-hydraulic systems is done. Further, the model decomposition/reduction strategy for parametric study in the nonlinear system is suggested. The idea of control-induced bifurcation is introduced and explained in light of servo-hydraulic systems. The servo-hydraulic system nonlinearities are explained and their effects on the robust stability are highlighted. This numerical work is also complemented with the experimental results on the servo-hydraulic circuits. This general procedure for robust stability design and control design, under the influence of nonlinearities, presented in this work can be used for any nonlinear system. The limitations of bifurcation theory based tools are also highlighted.