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Bramwell’s Helicopter Dynamics Bramwell’s Helicopter Dynamics Second edition A. R. S. Bramwell George Done David Balmford Oxford Auckland Boston Johannesburg Melbourne New Delhi Butterworth-Heinemann Linacre House, Jordan Hill, Oxford OX2 8DP 225 Wildwood Avenue, Woburn, MA 01801-2041 A division of Reed Educational and Professional Publishing Ltd A member of the Reed Elsevier plc group First published by Edward Arnold (Publishers) Ltd 1976 Second edition published by Butterworth-Heinemann 2001 © A. R. S. Bramwell, George Done and David Balmford 2001 All rights reserved. No part of this publication may be reproduced in any material form (including photocopying or storing in any medium by electronic means and whether or not transiently or incidentally to some other use of this publication) without the written permission of the copyright holder except in accordance with the provisions of the Copyright, Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London, England W1P OLP. Applications for the copyright holder’s written permission to reproduce any part of this publication should be addressed to the publishers British Library Cataloguing in Publication Data Bramwell, A.R.S. Bramwell’s helicopter dynamics. – 2nd ed. 1 Helicopters – Aerodynamics I Title II Done, George III Balmford, David IV Helicopter dynamics 629.1′33352 Library of Congress Cataloguing in Publication Data Bramwell, A.R.S. Bramwell’s helicopter dynamics / A.R.S. Bramwell, George Done, David Balmford. –2nd ed. p. cm. Rev. ed. of: Helicopter dynamics. c1976 Includes index ISBN 0 7506 5075 3 1 Helicopter–Dynamics 2 Helicopters–Aerodynamics I Done, George Taylor Sutton II Balmford, David III Bramwell, A.R.S. Helicopter dynamics IV Title TL716.B664 2001 629.133′352--dc21 00-049381 ISBN 0 7506 5075 3 Typeset at Replika Press Pvt Ltd, 100% EOU, Delhi 110 040, India Printed and bound in Great Britain by Bath Press, Avon. Contents Preface to the second edition vii Preface to the first edition ix Acknowledgements xi Notation xiii 1. Basic mechanics of rotor systems and helicopter flight 1 2. Rotor aerodynamics in axial flight 33 3. Rotor aerodynamics and dynamics in forward flight 77 4. Trim and performance in axial and forward flight 115 5. Flight dynamics and control 137 6. Rotor aerodynamics in forward flight 196 7. Structural dynamics of elastic blades 238 8. Rotor induced vibration 290 9. Aeroelastic and aeromechanical behaviour 319 Appendices 360 Index 371 Preface to the second edition At the time of publication of the first edition of the book in 1976, Bramwell’s Helicopter Dynamics was a unique addition to the fundamental knowledge of dynamics of rotorcraft due to its coverage in a single volume of subjects ranging from aerodynamics, through flight dynamics to vibrational dynamics and aeroelasticity. It proved to be popular, and the first edition sold out relatively quickly. Unfortunately, before the book could be revised with a view to producing a second edition, Bram (as he was known to his friends and colleagues) succumbed to a short illness and died. As well as leaving a sudden space in the helicopter world, his death left the publishers with their desire for further editions unfulfilled. Following an approach from the publishers, the present authors agreed, with considerable trepidation, to undertake the task of producing a second edition. Indeed, being asked was an honour, particularly so for one of us (GD), since we had been colleagues together at City University for a short period of two years. However, although it may be one thing to produce a book from one’s own lecture notes and published papers, it is entirely a different proposition to do the same when the original material is not your own, as we were to discover. It was necessary to try to understand why Bram’s book was so popular with the helicopter fraternity, in order that any revisions should not destroy any of the vital qualities in this regard. One of the characteristics that we felt endeared the book to its followers was the way explanations of what are complicated phenomena were established from fundamental laws and simple assumptions. Theoretical expressions were developed from the basic mathematics in a straightforward and measured style that was particular to Bram’s way of thinking and writing. We positively wished and endeavoured to retain his www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：Bramwell’s Helicopter Dynamics
