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8 documents found.
Basics of Hydraulic Systems
ISBN: 978-1-4200-7098-9,
Q. Zhang,
CRC Press,
ed. ,
2009,
view abstract
This work draws the link between service knowledge and the advanced theory of fluid power. Providing the fundamental knowledge on how a typical hydraulic system generates, delivers, and deploys fluid power, "Basics of Hydraulic Systems" highlights the key configuration features of the components that are needed to support their functionality in a system, such as operating principles, structural features, functionalities, and applications of core composing elements. It also shows how those components work together to perform the designated power transmission task. It moves from a system to instructional components approach.By presenting the ins and outs of hydraulic systems in an easy-to-follow way, this example-filled textbook provides students, engineers, and technical managers an effective nuts-and-bolts reference for studying the fundamentals of fluid power transmission technology. Rather than bogging readers down with extensive mathematical equations, this resource uses a visual, expressive approach with many graphic illustrations. It also includes examples and problems within each chapter and a solutions manual for qualifying course adoptions.
The text includes a section devoted to hydraulic energy storage and regeneration elements, since both play an important role in many hybrid power transmission systems, such as diesel-hydraulic hybrid vehicles. As a hydraulics expert and holder of seven US patents, the author's experience gives readers a practical view of the field that they can then immediately apply.
Cavitation
ISBN: 9781860941986,
F. Ronald Young,
Imperial College Press,
ed. ,
2000, März 2000
view abstract
This is the first book for decades to provide an up-to-date and comprehensive treatment of CAVITATION - the formation of bubbles (or cavities) in a liquid.
An introductory chapter, providing an historical background and various important definitions, is followed by a chapter on the theory and analysis of bubble dynamics. Two major chapters, on acoustic cavitation and hydrodynamic cavitation, offer a complete treatment of the work that has taken place in these two important strands of cavitation, and provide a wealth of information on the important applications of cavitation in engineering and science.
Sonoluminescence is introduced in Chapter 5, and sonochemistry is discussed in Chapter 6. Chapter 7 covers the numerous methods of bubble spectrum analysis and includes a survey of recent techniques and machines currently available.
Chapter 8 contains a wide variety of examples of cavitation, from civil engineering and mechanical engineering, physics, chemistry and medicine.
Fundamentals of Fluid Power Control
ISBN: 978-0-521-76250-2,
J. Watton,
Cambridge University Press,
ed. ,
2009,
view abstract
This exciting new reference text is concerned with fluid power control. It is an ideal reference for the practising engineer and a textbook for advanced courses in fluid power control. In applications in which large forces and/or torques are required, often with a fast response time, oil-hydraulic control systems are essential. They excel in environmentally difficult applications because the drive part can be designed with no electrical components and they almost always have a more competitive power/weight ratio compared to electrically actuated systems. Fluid power systems have the capability to control several parameters, such as pressure, speed, position, and so on, to a high degree of accuracy at high power levels. In practice there are many exciting challenges facing the fluid power engineer, who now must preferably have a broad skill set.
Contents: 1. Introduction, applications and basic concepts; 2. An introduction to fluid properties; 3. Steady state characteristics of circuit components; 4. Steady state performance of drive systems; 5. System dynamics; 6. Control systems; 7. Some case studies.
Hydraulic Control Systems - System Design and Analysis
J. S. Stecki and A. Garbacik,
Fluid Power Net Publications,
ed. ,
2000,
Numerical and Experimental Analysis of the Hydraulic Circuit for the Rear Hitch Control in Agricultural Tractors
ISBN: 9783940565921,
Apprimus Verlag,
ed. Casoli P., Vacca A., Anthony A., Berta G.L.,
2010, August 2006
view abstract
This paper describes the mathematical modeling of a tractor rear hitch control valve (HCV). The HCV operates in two modes namely lifting and lowering. The lifting circuit incorporates a pressure compensated flow control valve, while the lowering circuit is gravity assisted. The HCV incorporates a load-sensing system; load-sensing systems and pressure compensated valves are classified as feedback systems. The objective of this study is to develop a complete mathematical model of the HCV. This would help to better understand its functionality and to quantify the energy losses across its components. This paper presents the first results of the study.
Proceedings of the 4th FPNI-PhD Symposium, Sarasota, June 13-17, 2006
Fluid Power Net International,
ed. M. Ivantysynova,
2006, Juni 2006
Proceedings of the 4th FPNI-PhD Symposium, Sarasota, June 13-17, 2006
Fluid Power Net International,
ed. M. Ivantysynova,
2006, Juni 2006
Two Basic Concepts of Hydraulic Switching Converters
ISBN: ISBN 978-952-15-2037-2,
Tampere University of Technology, Finland,
ed. M. Linjama and A. Laamanen,
2008, Oktober 2008
view abstract
Hydraulic switching control attempts to transfer concepts from modern electrical drive control to hydraulics. Both, electrical and hydraulic switching systems can achieve higher efficiency than resistance control. In this paper, the hydraulic pendants of the electrical Buck-Converter and Cuk-Converter are introduced. Basically, the hydraulic switching converters consist of switching elements (fast valves), inductances and capacities. The active valves are typically switching at a certain frequency in PWM-mode. The Buck-Converter is a traditional step down converter, so the pressure at the load is always lower than the supply pressure. The concept of the Cuk-Converter even allows to boost the load pressure up to a higher level than the available supply pressure. But it is much more difficult to realize the hydraulic switching converters than their electrical pendants. The wave propagation in the fluid, the impossibility to realize a pure inductivity and the nonlinearities of the hydraulic elements are major difficulties. This paper gives an idea of the basic converter concepts and the difficulties concerning the realization of such drives. Further the results of simulations and measurements are presented.
