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Author: Samuel Kärnell Publisher: Linköping University Electronic Press ISBN: 9179298303 Category : Languages : en Pages : 72
Book Description
More and more vehicles are being electrified. Mobile working machines and heavy trucks are not excluded, and these machines are often hydraulically intense. Electrification entails new requirements for the hydraulic system and its components, and these requirements must be taken into consideration. Hydraulic systems have looked similar for a long time, but now there is an opportunity to advance. Many things change when a diesel engine is replaced with an electric motor. For example, variable-speed control becomes more relevant, electric regeneration becomes possible, and the use of multiple prime movers becomes an attractive alternative. The noise from the hydraulic system will also be more noticeable when the diesel engine is gone. Furthermore, the introduction of batteries to the system makes the energy more valuable, since batteries are heavy and costly compared to a diesel tank. Therefore, it is commercially viable to invest in the hydraulic system. This thesis revolves around the heart of the hydraulic system, that also is the root of all evil. That is the pump. Traditionally, a pump has had either a fixed displacement or a continuously variable displacement. Here, the focus is on something in between, namely a pump with discrete displacement. The idea of discrete displacement is far from unique, but has not been investigated in detail in combination with variable speed before. In this thesis, a novel design for a quiet pump with discrete displacement is presented and analysed. The results show that discrete displacement is relevant from an energy perspective for machines working extensively at high pressure levels and with low flow rates, and that a few discrete values are enough to make a significant difference. However, for other cycles, the possible energy gains are very limited, but the discrete displacement can be a valuable feature if downsizing the electric machine is of interest.
Author: Samuel Kärnell Publisher: Linköping University Electronic Press ISBN: 9179298303 Category : Languages : en Pages : 72
Book Description
More and more vehicles are being electrified. Mobile working machines and heavy trucks are not excluded, and these machines are often hydraulically intense. Electrification entails new requirements for the hydraulic system and its components, and these requirements must be taken into consideration. Hydraulic systems have looked similar for a long time, but now there is an opportunity to advance. Many things change when a diesel engine is replaced with an electric motor. For example, variable-speed control becomes more relevant, electric regeneration becomes possible, and the use of multiple prime movers becomes an attractive alternative. The noise from the hydraulic system will also be more noticeable when the diesel engine is gone. Furthermore, the introduction of batteries to the system makes the energy more valuable, since batteries are heavy and costly compared to a diesel tank. Therefore, it is commercially viable to invest in the hydraulic system. This thesis revolves around the heart of the hydraulic system, that also is the root of all evil. That is the pump. Traditionally, a pump has had either a fixed displacement or a continuously variable displacement. Here, the focus is on something in between, namely a pump with discrete displacement. The idea of discrete displacement is far from unique, but has not been investigated in detail in combination with variable speed before. In this thesis, a novel design for a quiet pump with discrete displacement is presented and analysed. The results show that discrete displacement is relevant from an energy perspective for machines working extensively at high pressure levels and with low flow rates, and that a few discrete values are enough to make a significant difference. However, for other cycles, the possible energy gains are very limited, but the discrete displacement can be a valuable feature if downsizing the electric machine is of interest.
Author: A. Alavudeen Publisher: CHAROTARPUBLISHINGHOUSEP.LTD ISBN: 8185594759 Category : Languages : en Pages : 4
Book Description
This text-book provides an in-depth background in the field of Fluid Power, It covers Design, Analysis, Operation and Maintenance. The reader will find this book useful for a clear understanding of the subject and also to assist in the selection and troubleshooting of fluid power components and systems used in manufacturing operations, providing a systematic summary of the fundamentals of hydraulic power transmission. This book discusses the main characteristics of hydraulic drives and their most important types in a manner comprehensible even to newcomers of the subject. This book covers a broad range of topics in the field, including: physical properties of hydraulic fluids; energy and power in hydraulic systems; frictional losses in hydraulic pipelines; hydraulic pumps, cylinders, cushioning devices, motors, valves, circuit design, conductors and fittings; hydraulic system maintenance; pneumatic air preparation and its components; and electrical controls for fluid power systems. It provides everything you need to understand the fundamental operating principles as well as the latest maintenance, repair and reconditioning techniques for industrial oil hydraulic systems. Better understanding of the material is promoted by the sample solutions to various mathematical problems given in each chapter. A number of photographs and illustration have been attached to reflect current "Fluid Power system".
Author: Noah D. Manring Publisher: McGraw Hill Professional ISBN: 0071812210 Category : Technology & Engineering Languages : en Pages : 321
Book Description
A COMPLETE GUIDE TO FLUID POWER PUMPS AND MOTORS Written by an expert in the field of fluid power, this book provides proven methods for analyzing, designing, and controlling high-performance axial-piston swash-plate type machinery. Fluid Power Pumps and Motors: Analysis, Design, and Control offers a comprehensive mechanical analysis of hydrostatic machines and presents meticulous design guidelines for machine components. Detailed diagrams and useful formulas are included throughout. Using the results and techniques employed in this practical resource will reduce product delivery lead-time and costs to increase overall efficiency. COVERAGE INCLUDES: Fluid properties | Fluid mechanics | Mechanical analysis Piston pressure | Steady-state results | Machine efficiency Designing a cylinder block, valve plate, piston, slipper, swash plate, and shaft | Displacement controlled pumps Pressure controlled pumps
Author: James A. Sullivan Publisher: ISBN: Category : Science Languages : en Pages : 536
Book Description
"A practical text and reference for practitioners in the field as well as for candidates preparing for the Mechanics Technician and Specialist Certification examinations offered by the Fluid Power Society."--Preface.
Author: Dudley A. Pease Publisher: Prentice Hall ISBN: Category : Juvenile Nonfiction Languages : en Pages : 392
Book Description
Organized for both classroom and reference use, this text covers the many uses of liquids, hydraulics, and gases, pneumatics, as power transmission media in mechanical, electrical, and manufacturing engineering.
Author: Robert P. Kokernak Publisher: ISBN: Category : Fluid power technology Languages : en Pages : 456
Book Description
Ideal for use in industrial training seminars, this well-illustrated and exceptionally lucid guide to fluid power technology strikes just the right balance between theory and application, providing both conceptual and practical information needed by today's technicians and technologists to succeed in the field. Emphasizes the inherent simplicity of fluid power systems and their underlying principles of operation and develops each topic logically, with careful attention to fine details. First shows 'how' and 'why' fluid behaves in a particular manner; next, makes abstract concepts concrete by demonstrating how this behavior is evidenced in situations already familiar to readers, then; extends concepts to new conditions and applications. Offers an adaptable approach to mathematics, making readers at ease no matter what their skill level. Offers many useful learning tools, including safety sidebars, suggested activities (over 60% new to this edition) exercises and problems (30% new), and end-of-chapter questions (many new). Now adds a section on 'Using Computers' to its introductory chapter.
Author: Samuel Kärnell
Author: Samuel Kärnell
Author: A. Alavudeen
Author: Samuel Kärnell
Author: Noah D. Manring
Author: Anthony Esposito
Author: James A. Sullivan
Author: Charles S. Hedges
Author: Dudley A. Pease
Author: Robert P. Kokernak
Author: Russell W. Henke