Control Aspects of Complex Hydromechanical Transmissions

Control Aspects of Complex Hydromechanical Transmissions
Author: L. Viktor Larsson
Publsiher: Linköping University Electronic Press
Total Pages: 55
Release: 2017-08-17
Genre: Electronic Book
ISBN: 9789176854839

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This thesis deals with control aspects of complex hydromechanical transmissions. The overall purpose is to increase the knowledge of important aspects to consider during the development of hydromechanical transmissions to ensure transmission functionality. These include ways of evaluating control strategies in early design stages as well as dynamic properties and control aspects of displacement controllers, which are key components in these systems. Fuel prices and environmental concerns are factors that drive research on propulsion in heavy construction machinery. Hydromechanical transmissions are strong competitors to conventional torque-converter transmissions used in this application today. They offer high efficiency and wide speed/torque conversion ranges, and may easily be converted to hybrids that allow further fuel savings through energy recuperation. One challenge with hydromechanical transmissions is that they offer many different configurations, which in turn makes it important to enable evaluation of control aspects in early design stages. In this thesis, hardware-in-the-loop simulations, which blend hardware tests and standard software-based simulations, are considered to be a suitable method. A multiple-mode transmission applied to a mid-sized construction machine is modelled and evaluated in offline simulations as well as in hardware-in-the-loopsimulations. Hydromechanical transmissions rely on efficient variable pumps/motors with fast, accurate displacement controllers. This thesis studies the dynamic behaviour of the displacement controller in swash-plate axial-piston pumps/motors. A novel control approach in which the displacement is measured with an external sensor is proposed. Performance and limitations of the approach are tested in simulations and in experiments. The experiments showed a significantly improved performance with a controller that is slightly more advanced than a standard proportional controller. The implementation of the controller allows simple tuning and good predictability of the displacement response.

Hydrostatic and Hydrodynamic Transmissions

Hydrostatic and Hydrodynamic Transmissions
Author: C. M. Edghill
Publsiher: Unknown
Total Pages: 42
Release: 1977
Genre: Technology & Engineering
ISBN: STANFORD:36105001802300

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Power Engineering and Information Technologies in Technical Objects Control

Power Engineering and Information Technologies in Technical Objects Control
Author: Genadiy Pivnyak,Olexandr Beshta,Mykhaylo Alekseyev
Publsiher: CRC Press
Total Pages: 280
Release: 2017-02-03
Genre: Technology & Engineering
ISBN: 9781351771122

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Improved knowledge in the field of technical objects operation and control helps manufacturers to decrease energy consumption and keep construction costs low. Moreover, it helps dealing effectively with environmental problems and switching to renewable forms of energy on the path of sustainable development of the society. The methods and technologies presented in this book will allow to improve the effectiveness of technical objects control and helps achieving safe, economical, high-quality usage of power engineering and information technologies. The book presents recent advances in power engineering, electric drives, transport systems, power electronics, cybersecurity and others. Vital issues of innovative small vehicles with using hydrogen fuel as well as boring rigs and underwater hydraulic transport pipelines are considered. The book offers a fresh look at energy-saving and energy efficiency in industry, new ideas in information technologies, paying much attention to interdisciplinary specification of the results obtained.

Hydrostatic Transmissions and Actuators

Hydrostatic Transmissions and Actuators
Author: Gustavo Costa,Nariman Sepehri
Publsiher: John Wiley & Sons
Total Pages: 405
Release: 2015-09-28
Genre: Technology & Engineering
ISBN: 9781118818794

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Hydrostatic Transmissions and Actuators takes a pedagogical approach and begins with an overview of the subject, providing basic definitions and introducing fundamental concepts. Hydrostatic transmissions and hydrostatic actuators are then examined in more detail with coverage of pumps and motors, hydrostatic solutions to single-rod actuators, energy management and efficiency and dynamic response. Consideration is also given to current and emerging applications of hydrostatic transmissions and actuators in automobiles, mobile equipment, wind turbines, wave energy harvesting and airplanes. End of chapter exercises and real world industrial examples are included throughout and a companion website hosting a solution manual is also available. Hydrostatic Transmissions and Actuators is an up to date and comprehensive textbook suitable for courses on fluid power systems and technology, and mechatronics systems design.

EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization

EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization
Author: H.C. Rodrigues,J. Herskovits,C.M. Mota Soares,A.L. Araújo,J.M. Guedes,J.O. Folgado,F. Moleiro,J. F. A. Madeira
Publsiher: Springer
Total Pages: 1475
Release: 2018-09-13
Genre: Technology & Engineering
ISBN: 9783319977737

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The papers in this volume focus on the following topics: design optimization and inverse problems, numerical optimization techniques,efficient analysis and reanalysis techniques, sensitivity analysis and industrial applications. The conference EngOpt brings together engineers, applied mathematicians and computer scientists working on research, development and practical application of optimization methods in all engineering disciplines and applied sciences.

Fluid Power Transmission And Control

Fluid Power Transmission And Control
Author: A. Alavudeen,Khalid Hussain Syed And N. Shanmugam
Publsiher: CHAROTARPUBLISHINGHOUSEP.LTD
Total Pages: 4
Release: 2007
Genre: Electronic Book
ISBN: 9788185594750

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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".

Heavy Duty Wheeled Vehicles

Heavy Duty Wheeled Vehicles
Author: Boris Nikolaevich Belousov,Sergey D Popov
Publsiher: SAE International
Total Pages: 579
Release: 2014-01-27
Genre: Technology & Engineering
ISBN: 9780768077230

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Heavy-duty wheeled vehicles (HDWVs) are all-wheel-drive vehicles that carry 25 tons or more and have three or more axles. They transport heavy, bulky cargo such as raw minerals, timber, construction materials, pre-fabricated modules, weapons, combat vehicles, and more. HDWVs are used in a variety of industries (mining, logging, construction, energy) and are critical to a country’s economy and defense. These vehicles have unique development requirements due to their high loads, huge dimensions, and specific operating conditions. Hauling efficiencies can be improved by increasing vehicle load capacity; however capacities are influenced by legislation, road limits, and design. Designing HDWVs differs from other multi-purpose all-wheel-drive vehicles. The chassis must be custom-designed to suit the customer’s particular purpose. The number of axles is another variable, as well as which ones are driving and which are driven. Tires are also customizable. Translated by SAE from Russian, this book narrates the history of HDWVs and presents the theory and calculations required to design them. It summarizes results of the authors’ academic research and experience and presents innovative technical solutions used for electric and hydrostatic transmissions, steering systems, and active safety of these vehicles. The book consists of three parts. Part one covers HDWV design history and general design methods, including basic vehicle design, and evaluating HDWV use conditions. Part one also covers general operation requirements and consumer needs, and a brief analysis of structural components of existing HDWVs and prototypes. Part two outlines information needs for designing HDWVs. Part three reviews basic theory and calculation of innovative technical solutions, as well as special requirements for component parts. This comprehensive title provides the following information about HDWVs: • History of design and manufacture. • Manufacturers’ summary design data. • Background data on sample vehicles. • Component calculation examples. • Overview of motion theory, which is useful in design and placement of bulky cargo.

Dynamic Analysis and Control System Design of Automatic Transmissions

Dynamic Analysis and Control System Design of Automatic Transmissions
Author: Joel M Maguire,Huei Peng,Shushan Bai
Publsiher: SAE International
Total Pages: 218
Release: 2013-02-12
Genre: Technology & Engineering
ISBN: 9780768079326

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While the basic working principle and the mechanical construction of automatic transmissions has not changed significantly, increased requirements for performance, fuel economy, and drivability, as well as the increasing number of gears has made it more challenging to design the systems that control modern automatic transmissions. New types of transmissions—continuously variable transmissions (CVT), dual clutch transmissions (DCT), and hybrid powertrains—have presented added challenges. Gear shifting in today’s automatic transmissions is a dynamic process that involves synchronized torque transfer from one clutch to another, smooth engine speed change, engine torque management, and minimization of output torque disturbance. Dynamic analysis helps to understand gear shifting mechanics and supports creation of the best design for gear shift control systems in passenger cars, trucks, buses, and commercial vehicles. Based on the authors’ graduate-level teaching material, this well-illustrated book relays how the fundamental principles of hydraulics and control systems are applied to today’s automatic transmissions. It opens with coverage of basic automatic transmission mechanics and then details dynamics and controls associated with modern automatic transmissions. Topics covered include: gear shifting mechanics and controls, dynamic models of planetary automatic transmissions, design of hydraulic control systems, learning algorithms for achieving consistent shift quality, torque converter clutch controls, centrifugal pendulum vibration absorbers, friction launch controls, shift scheduling and integrated powertrain controls, continuously variable transmission ratio controls, dual-clutch transmission controls, and more. The book includes many equations and clearly explained examples. Sample Simulink models of various transmission mechanical, hydraulic and control subsystems are also provided. Chapter Two, which covers planetary gear automatic transmissions, includes homework questions, making it ideal for classroom use. In addition to students, new engineers will find the book helpful because it provides the basics of transmission dynamics and control. More experienced engineers will appreciate the theoretical discussions that will help elevate the reader’s knowledge. Although many automatic transmission-related books have been published, most focus on mechanical construction, operation principles, and control hardware. None tie the dynamic analysis, control system design, and analytic investigation of the mechanical, hydraulic, and electronic controls as does this book.