Helicopter Test and Evaluation

Helicopter Test and Evaluation

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English
388 Pages

Description

Although a number of texts on helicopter aerodynamics have been written, few have explained how the various theories concerning rotorborne flight underpin practical flight test and evaluation. This book combines theoretical information on aerodynamics, stability, control and performance with details of evaluation methodologies and practical guidance on the conduct of helicopter flight tests.

For each topic the relevant theory is explained briefly and followed by details of the practical aspects of testing a conventional helicopter. These include:

* safety considerations

* planning the tests

* the most efficient way to conduct individual flights

Where possible typical test results are presented and discussed.

The book draws on the authors' extensive experience in flight test and flight test training and will appeal not only to professionals working in the area of rotorcraft test and evaluation, but also to helicopter pilots, rotorcraft designers and manufacturers and final year undergraduates of aeronautical engineering

Subjects

Informations

Published by
Published 12 February 2009
Reads 2
EAN13 9781405172547
License: All rights reserved
Language English

Legal information: rental price per page €. This information is given for information only in accordance with current legislation.

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Contents
Chapter 1
Chapter 2
Chapter 3
Preface
Abbreviations
Notation
The Flight Test Process 1.1 Introduction 1.2 Flight test planning 1.3 Conducting the trial 1.4 Post-trials actions
Performance Theory 2.1 Introduction 2.2 Axial flight: momentum theory 2.3 Axial flight: blade element theory 2.4 Non-dimensional coecients 2.5 Axial flight: improved theoretical estimates 2.6 Axial flight: vertical descents and the vortex-ring state 2.7 Horizontal flight: momentum theory 2.8 Horizontal flight: blade element theory 2.9 Horizontal flight: improved theoretical estimates 2.10 Tail rotor power 2.11 Powered descents 2.12 Autorotation 2.13 Autorotative performance 2.14 Flare characteristics and engine-olandings 2.15 The avoid curve
Performance Testing 3.1 Introduction 3.2 Non-dimensional parameters 3.3 Performance test planning 3.4 Level flight performance testing 3.5 Vertical performance testing 3.6 Climb performance testing 3.7 Determination of performance limited parameters
vii
x
xiii
1 1 1 5 6
8 8 8 11 14 16 20 22 26 29 34 36 44 51 54 60
65 65 65 68 71 87 106 115
v
vi
Contents
Chapter 4
Chapter 5
Chapter 6
Stability and Control Theory 4.1 Introduction 4.2 Aero-derivatives for rotorcraft 4.3 Equations of motion for a rigid airframe 4.4 Equations of flapping motion 4.5 Flap dynamics 4.6 Rotor contributions to static and dynamic stability 4.7 Longitudinal static stability 4.8 Manoeuvre stability 4.9 Longitudinal dynamic stability and control response 4.10 Lateral/directional static stability 4.11 Lateral/directional dynamic stability and control response
Stability and Control Testing 5.1 Assessing flight control mechanical characteristics 5.2 Assessing static stability 5.3 Manoeuvre stability testing 5.4 Documenting dynamic stability characteristics 5.5 Time domain methods for control response testing 5.6 Frequency domain methods for control response assessment 5.7 Mission task methods
Helicopter Systems 6.1 Introduction 6.2 Air data systems 6.3 Engine control and rotor governing systems 6.4 Flight control systems 6.5 Automatic flight control systems
Chapter 7Systems Testing 7.1 Methodology 7.2 Cockpits 7.3 Pressure error measurement 7.4 Engine and rotor governing 7.5 Eect of AFCS on handling qualities testing 7.6 Failure testing
References
Index
119 119 120 125 128 132 146 150 152 153 163 167
179 179 185 194 198 202 211 220
231 231 231 239 261 264
295 295 298 310 319 329 338
357
361