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2019 | Book

Electro-Hydraulic Actuation Systems

Design, Testing, Identification and Validation

Authors: J. Jaidev Vyas, Dr. Balamurugan Gopalsamy, Harshavardhan Joshi

Publisher: Springer Singapore

Book Series : SpringerBriefs in Applied Sciences and Technology

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About this book

The book serves as a unique integrated platform, which not only describes the design methodology of electro-hydraulic actuation systems but also provides insights into the design of the servo valve, which is the most important component in the system. It presents a step-by-step design process, comparative tables, illustrative figures, and detailed explanations. The book focuses on the design and testing of electro-hydraulic actuation systems, which are increasingly being used in motion control applications, particularly in those where precision actuation at high operational rates is of prime importance. It describes in detail the design philosophy of such high-performance systems, presenting a system used as a physical test setup together with experimental results to corroborate the calculations. Of particular interest are the electro-hydraulic servo valves that form the heart of these actuations. These valves are complex and not much data is available in open literature due to OEM propriety issues. In this context, the book discusses the elaborate mathematical models that have been derived and an approach to validate the mathematical models with test results. Presenting the complex methodology in simple language, it will prove to be a valuable resource for students, researchers, and professional engineers alike.

Table of Contents

Frontmatter
Chapter 1. Introduction
Abstract
It is well-known fact that most of the smaller aircraft can be manually controlled since the loads on the flight control surfaces are less and well within the handling capability of pilot. However, to reduce the pilot’s workload, hydraulic boosters are used in such aircraft with lower operating pressures. Redundancy of hydraulic system is not an essential consideration in such applications since the aircraft can be fully controlled by the pilot in the event of hydraulic power failures. However, many modern-day aircraft with large take-off weights and propelled by jet engines result in control loads which go beyond pilot’s handling capability and positively calls for a powered flight control system. Further, this powered flight control system gets more complicated due to the interfacing of automatic flight control system (AFCS). Factors like reliability and high response characteristics with high operating load holding features required for the flight control operation have inadvertently resulted in the use of hydraulic systems in modern-day aircraft. These systems are used in conjunction with electrical interfaces like electrically operated direction control valves and sensors for precision actuation of the flight control surface. Hence, the system in whole is referred to as electro-hydraulic actuation systems.
J. Jaidev Vyas, Balamurugan Gopalsamy, Harshavardhan Joshi
Chapter 2. Mathematical Modeling of Flapper Nozzle Valve
Abstract
In this section, mathematical models for the flapper nozzle type servo valve are presented. These models are derived from the fundamental governing equations and are important in the context of understanding the dynamics of the system and realizing a virtual prototype for simulations. The various dynamic phenomenon involved in the system are represented using ordinary differential equations. These differential equations are solved using Laplace Transform technique to build single input single output system models in time domain. The transfer function model thus presented represents the spool stage and the flapper stage respectively and provides a good tool to understand system behaviour under various operating frequencies and input command of various amplitudes and patterns.
J. Jaidev Vyas, Balamurugan Gopalsamy, Harshavardhan Joshi
Chapter 3. Servo Valve Characteristic Curves
Abstract
Typically, a servo valve is characterized by a series of curves which provide behavioural information of the servo valve under varying operating conditions. These curves are typically used in identifying the valve centre type, null bias, response to inputs of varying amplitudes at varying frequency and phase difference between system input and output at different operating frequencies.
J. Jaidev Vyas, Balamurugan Gopalsamy, Harshavardhan Joshi
Chapter 4. System Identification
Abstract
System identification is a process of developing mathematical models for the dynamic system of interest, which can be used for the modelling and simulation, prediction, control design, error detection, etc. The process involves the various experimental procedures carried out for variable input signals, followed by the identification of mathematical model that best fits the system of interest. The accuracy of the selected mathematical model is then validated using System Identification Toolbox/MATLAB. The model with the best fit can be used for the further analysis of the system.
J. Jaidev Vyas, Balamurugan Gopalsamy, Harshavardhan Joshi
Chapter 5. Results and Discussion
Abstract
It is noted from the literature that though the servo valve system nonlinear is often and satisfactorily modelled as a linear system.
J. Jaidev Vyas, Balamurugan Gopalsamy, Harshavardhan Joshi
Chapter 6. Conclusion
Abstract
This brief highlights the importance and the necessity of carrying out system identification in the context of electro-hydraulic actuation system for flight control applications.
J. Jaidev Vyas, Balamurugan Gopalsamy, Harshavardhan Joshi
Metadata
Title
Electro-Hydraulic Actuation Systems
Authors
J. Jaidev Vyas
Dr. Balamurugan Gopalsamy
Harshavardhan Joshi
Copyright Year
2019
Publisher
Springer Singapore
Electronic ISBN
978-981-13-2547-2
Print ISBN
978-981-13-2546-5
DOI
https://doi.org/10.1007/978-981-13-2547-2

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