汽车变速器振动和噪声

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英文版 汽车变速器振动噪声 经典资料,适合变速器、齿轮结构的NVH性能开发做参考。
VEHICLE GEARBOX NOISE AND VIBRATION Automotive series Series editor Thomas Kurfess Vehicle gearbox noise and T uma January 2014 Vibration: Measurement, Signal Analysis, Signal Processing and Noise reduction measures Modelling, Simulation and Control of Tanelli, Corno and Savaresi March 2014 Two-Wheeled Vehicles Modeling and control of engines and Eriksson and nielsen February 2014 Drivelines Advanced Composite materials for Elmarakbi December 2013 Automotive Applications: Structural Integrity and Crashworthiness Guide to load Analysis for Durability ohannesson and speckert November 2013 in vehicle engineering VEHICLE GEARBOX NOISE ANDⅤ IBRATION MEASUREMENT, SIGNAL ANALYSIS SIGNAL PROCESSING AND NOISE REDUCTION MEASURES Jiri Tuma VSB Technical University of Ostrava, Czech Republic WILEY This edition first published 2014 o 2014, John Wiley Sons, Ltd Registered office John Wiley sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex, PO19 8SQ, United Kingdom For details of our global editorial offices, for customer services and for information about how to apply for permissiontoreusethecopyrightmaterialinthisbookpleaseseeourwebsiteatwww.wiley.com The right of the author to be identified as the author of this work has been asserted in accordance with the Copyright, Designs and Patents Act 1988 All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, except as permitted by the UK Copyright, Designs and Patents Act 1988, without the prior permission of the publisher Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may not be available in electronic books Designations used by companies to distinguish their products are often claimed as trademarks. All brand names and luct names used in this book are trade names service marks trademarks or registered trademarks of their espective owners. The publisher is not associated with any product or vendor mentioned in this book Limit of Liability/Disclaimer of Warranty: While the publisher and author have used their best efforts in preparing this book, they make no representations or warranties with respect to the accuracy or completeness of the contents of this book and specifically disclaim any implied warranties of merchantability or fitness for a particular purpose. It is sold on the understanding that the publisher is not engaged in rendering professional services and neither the publisher nor the author shall be liable for damages arising herefrom. If professional advice or other expert assistance is required, the services of a competent professional should be sought MATLAB is a trademark of The Math Works, Inc. and is used with permission The math Works does not warrant the accuracy of the text or exercises in this book. This books use or discussion of matlab software or related products does not constitute endorsement or sponsorship by The Math Works of a particular pedagogical approach or particular use of the MATLAB software Library of Congress Cataloging-in-Publication Data Tuma, Jiri (Engineer Vehicle gearbox noise and vibration / by Jiri tuma I online resource Includes bibliographical references and index Description based on print version record and CiP data provided by publisher; resource not viewed IsBN978-1-118-79761-7(ePub)-ISBN978-1-118-79762-4( Adobe pde) isbn978-1-118-35941-9(cloth) 1. Motor vehicles-Transmission devices-Noise. I. Title TL262 6292440288-dc23 2013051076 A catalogue record for this book is available from the British Library ISBN:978-1-118-359419 Set in 10/12pt Times by Aptara Inc, New Delhi, India 12014 To Magda, Lucie, Peter and eva To the memory of my parents and brother Contents Series preface reface X Acknowledgements 1.1 Description of the TATRA Truck Powertrain System 1.2 Test stand References Tools for Gearbox Noise and vibration Frequency analysis 7 I Theory of Digitisation of Analogue signals 7 2.1./ Types of signals 7 2.1.2 Normal Distribution 10 2.1.3 Mean Value and Standard Deviation(RMS)of a General signal 10 2. 4 Covariance 2.1.5 Mean value and Standard Deviation(RMS)of a Sinusoidal Signal 12 2.1.6 Digitali f signals 12 2.1.7 Signal-to-Noise ratio 14 2.1.8 Sampling as a Mapping 15 2.2 Nyquist-Shannon Sampling Theorem 16 2. 2.1 Antialiasing Filter 18 2. 2. 2 Sound and Vibration Measuring Chain 20 Signal Analysis Based on Fourier Transform 21 2.3./ Time and Frequency domain 2.3.2 Fourier Series for Periodic Functions 22 2.3.3 Fourier Transform of the Continuous-Time Functions 24 2.3.4 Short-Time Fourier Transform 26 2.3.5 Fourier Transform of the Discrete-Time functions 27 2.3.6 Inverse Fourier Transform of the Discrete-Time Functions 28 2.3.7 DFTof a Constant and a Cosine signal 30 2.3.8 Phasors as a Tool for Modelling Harmonic signals 32 2.3.9 Example of DFT Calculation 34 2.3.10 Time and Frequency scales 35 VII Contents 2.3.11 Spectral Unit of autospectrum 36 2.3.12 Cross-Spectrum 37 2.3.13 Calculation of the Inverse Discrete Fourier Transform 39 2.3.14 Fast Fourier Transform 39 2.3.15 Time window 2.3.16 Calculation of the Signal Power 43 2.3.17 Frequency Weighting 46 2.3. 18 Analysis of random Signals with the use of averaging in the Frequency domain 48 2. 4 Zoom fft 52 2.4.1 Real-Time zoom 53 2. 4.2 Non-Destructive zoom 54 2.5 Filtration in the Frequency domain 55 2.5.1 2.5.2 Integration and Calculation of Derivatives 2.6 Average Power of the signal References 60 Gearbox Frequency Spectrum 61 3.1 Source of gearbox Noise and vibration 3.2 Spectrum Signature 3.3 Low Harmonics of the Shaft Speed 66 3.4 Harmonics of the Fundamental Toothmeshing Frequency and their Sidebands 67 3.5 Subharmonic Components 70 3.5./ Hunting Tooth Frequency 70 3.5.2 Effect of the Oil Film Instability in Journal bearings 3.6 Ghost (or Strange) Components 3.7 Gear rattle 3.8 Periodicity in Signals Measured on a Planetary Gearbox Spectrum Components Originating from Faults in Rolling Element Bearings 76 3.9./ Calculations for Bearing defect Frequencies 76 3.9.2 Envelope frequency analysis 82 References 83 Harmonics and Sidebands 85 4.1 Harmonics 85 4. Sidebands 4.2.1 Amplitude modulation 4.2.2 Phase modulation 4.2.3 Mixed modulation 6 4.3 Analytic Signal 97 4.3./ Definition of Hilbert Transform 4.3.2 Calculation of Hilbert Transform of sampled signals 101 4.3.3 Demodulation of the Modulated harmonic signal 104 4.3.4 Unwrapping Phase 105

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