ISO INTERNATIONAL STANDARD 13373-2 Second edition 2016-01-15 Condition monitoring and diagnostics of machines Vibration condition monitoring Part 2: Processing, analysis and presentation of vibration data Surveillance et diagnostic d'état des machines - Surveillance des vibrations Partie 2: Traitement, analyse et présentation des données vibratoires Reference number IS0 13373-2:2016(E) SO International Organization for Standardization @ IS0 2016 STANDARDIZATION C15956617 ed without license from IHS IS013373-2:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org Intenatinair PrganizationforStandardization icensee-ZHEJIANG INSTOF STANDARDIZAoISQ06-All rights reserved Not for Resale, 2016/3/29 02:52:38 etworking permitted without license from IHS IS0 13373-2:2016(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope. 2 Normative references 3 Signal conditioning. 3.1 General. ..1 3.2 Analogue and digital systems. 3.2.1 General. 3 3.2.2 Digitizing techniques .4 3.3 Signal conditioners. 4 3.3.1 General ..4 3.3.2 Integration and differentiation 4 3.3.3 Root-mean-square vibration value .5 3.3.4 Dynamic range ..6 3.3.5 Calibration. .6 3.4 Filtering 4 Data processing and analysis ..7 4.1 General 1 4.2 Time domain analysis 4.2.1 Time wave forms ..8 4.2.2 Beating 4.2.3 Modulation .10 4.2.4 Envelope analysis .11 4.2.5 Monitoring of narrow-band frequency spectrum envelope .11 4.2.6 Shaft orbit .12 4.2.7 d.c. shaft position .12 4.2.8 Transient vibration .12 4.2.9 Impulse. ..13 4.2.10 Damping ..14 4.2.11 Time domain averaging .16 4.3 Frequency domain analysis. .17 4.3.1 General. ..17 4.3.2 Fourier transform ..17 4.3.3 Leakage and windowing .18 4.3.4 Frequency resolution.. .19 4.3.5 Record length .19 4.3.6 Amplitude modulation (sidebands) 19 4.3.7 Aliasing. 21 4.3.8 Synchronous sampling 22 4.3.9 Spectrum averaging. .23 4.3.10 Logarithmic plots (with dB references) 23 4.3.11 Zoomanalysis .24 4.3.12 Differentiation and integration 24 4.4 Display of results during operational changes 25 4.4.1 Amplitude and phase (Bode plot) 25 4.4.2 Polar diagram (Nyquist diagram) 26 4.4.3 Cascade (waterfall) diagram. 27 4.4.4 Campbell diagram. 29 4.5 Real-time analysis and real-time bandwidth 30 4.6 Order tracking (analogue and digital) 31 4.7 Octave and fractional-octave analysis .31 4.8 Cepstrumanalysis 31 iii ISee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vithout license from IHS Not for Resale, 2016/3/29 02:52:38