1、Mechanical vibration Rotor balancingPart 2: VocabularyBS ISO 219402:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Mechanical vibration Rotor balancing Part 2: VocabularyVibrations mcaniques quilibrage des rotors Partie 2: VocabulaireINTERNATIONAL STAND
2、ARDISO21940-2First edition2017-05Reference numberISO 21940-2:2017(E)National forewordThis British Standard is the UK implementation of ISO 219402:2017. It supersedes BS ISO 1925:2001, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee GME/21/5, Mechanical
3、 vibration, shock and condition monitoring Vibration of machines.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct applicatio
4、n. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 89642 2ICS 01.040.21; 21.120.40Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy
5、 Committee on 30 June 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 219402:2017 ISO 2017Mechanical vibration Rotor balancing Part 2: VocabularyVibrations mcaniques quilibrage des rotors Partie 2: VocabulaireINTERNATIONAL STANDARDISO21940-2First edition20
6、17-05Reference numberISO 21940-2:2017(E)BS ISO 219402:2017ISO 21940-2:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
7、or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8
8、 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 219402:2017ISO 21940-2:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part o
9、f this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body
10、in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO 21940-2:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 13.1 Mechanics 13.2 Rotor s
11、ystems . 33.3 Unbalance 53.4 Balancing 73.5 Balancing machines 9Annex A (informative) Illustrated terminology for balancing machines .12Bibliography .21Alphabetical index .21 ISO 2017 All rights reserved iiiContents PageBS ISO 219402:2017ISO 21940-2:2017(E)ForewordISO (the International Organization
12、 for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has
13、the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The pro
14、cedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editor
15、ial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rig
16、hts identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an e
17、xplanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .
18、org/ iso/ foreword .html.The committee responsible for this document is Technical Committee ISO/TC 108, Mechanical vibration, shock and condition monitoring, Subcommittee SC 2, Measurement and evaluation of mechanical vibration and shock as applied to machines, vehicles and structures.This first edi
19、tion of ISO 219402 cancels and replaces ISO 1925:2001, which has been technically revised. All terms and definitions formerly contained in different balancing standards have been reviewed and compiled in this document.A list of all parts in the ISO 21940 series can be found on the ISO website.iv ISO
20、 2017 All rights reservedBS ISO 219402:2017ISO 21940-2:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical commi
21、ttees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the I
22、nternational Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
23、different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. I
24、SO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this d
25、ocument is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade
26、 Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.The committee responsible for this document is Technical Committee ISO/TC 108, Mechanical vibration, shock and condition monitoring, Subcommittee SC 2, Measurement and ev
27、aluation of mechanical vibration and shock as applied to machines, vehicles and structures.This first edition of ISO 219402 cancels and replaces ISO 1925:2001, which has been technically revised. All terms and definitions formerly contained in different balancing standards have been reviewed and com
28、piled in this document.A list of all parts in the ISO 21940 series can be found on the ISO website.iv ISO 2017 All rights reserved INTERNATIONAL STANDARD ISO 21940-2:2017(E)Mechanical vibration Rotor balancing Part 2: Vocabulary1 ScopeThis document defines terms on balancing. It complements ISO 2041
29、, which is a general vocabulary on mechanical vibration and shock.2 Normative referencesThere are no normative references in this document.3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for use in stan
30、dardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp NOTE An illustrated terminology for balancing machines is provided in Annex A.3.1 Mechanics3.1.1principal axis of inertia
31、one of three mutually perpendicular axes intersecting each other at a given point about which the products of inertia of a solid body are zeroNote 1 to entry: In balancing (3.4.1), the term principal axis of inertia is used to designate the central principal axis of inertia (of the three such axes)
32、most nearly coincident with the shaft axis (3.2.7) of the rotor.SOURCE: ISO 2041:2009, 1.34, modified converted to singular and the notes to entry have been changed.3.1.2speedangular velocity of a rotorNote 1 to entry: Speed is measured in revolutions per unit time or in angle (in radians) per unit
33、time.Note 2 to entry: The quantities most frequently used for specifying speed aren rotational speed measured in revolutions per minute;f rotational frequency measured in revolutions per second; angular velocity measured in radians per second. ISO 2017 All rights reserved 1BS ISO 219402:2017ISO 2194
34、0-2:2017(E)3.1.3resonance speedDEPRECATED: critical speedDEPRECATED: resonant speedcharacteristic speed at which resonances of a system are excitedNote 1 to entry: In the context of balancing (3.4.1), a resonance speed is related only to the once-per-revolution component of vibration.SOURCE: ISO 204
35、1:2009, 2.85, modified the notes to entry have been changed.3.1.4rigid-body-mode resonance speedresonance speed (3.1.3) of a rotor at which flexure of the rotor can be neglected3.1.5flexural resonance speedresonance speed (3.1.3) of a rotor at which flexure of the rotor cannot be neglected3.1.6servi
36、ce speedangular velocity at which a rotor operates in its final installation or environment3.1.7balancing speedangular velocity at which rotor balancing (3.4.1) is performed3.1.8axis of rotationinstantaneous line about which a body rotates3.1.9rigid body modemode shape of a rotor corresponding to a
37、rigid-body-mode resonance speed (3.1.4) for a given support system3.1.10flexural modemode shape of a rotor corresponding to a flexural resonance speed (3.1.5) for a given support system3.1.11shape function of the nth flexural moden(z)mathematical expression for the deflection shape of the rotor in t
38、he corresponding flexural mode (3.1.10) normalized so that the maximum deflection is unityNote 1 to entry: Frequently, it is assumed that the modes are mutually orthogonal and the system is axially symmetric. This is not applicable in all cases.3.1.12modal amplification factorMnratio of the magnitud
39、e of the modal vibration displacement vector to the magnitude of the modal eccentricity for the nth flexural mode (3.1.10)Note 1 to entry: Modal amplification factor is a non-dimensional quantity. It is expressed for the nth mode asMnnnnn=+()()()22222142 ISO 2017 All rights reservedBS ISO 219402:201
40、7ISO 21940-2:2017(E)3.1.3resonance speedDEPRECATED: critical speedDEPRECATED: resonant speedcharacteristic speed at which resonances of a system are excitedNote 1 to entry: In the context of balancing (3.4.1), a resonance speed is related only to the once-per-revolution component of vibration.SOURCE
41、: ISO 2041:2009, 2.85, modified the notes to entry have been changed.3.1.4rigid-body-mode resonance speedresonance speed (3.1.3) of a rotor at which flexure of the rotor can be neglected3.1.5flexural resonance speedresonance speed (3.1.3) of a rotor at which flexure of the rotor cannot be neglected3
42、.1.6service speedangular velocity at which a rotor operates in its final installation or environment3.1.7balancing speedangular velocity at which rotor balancing (3.4.1) is performed3.1.8axis of rotationinstantaneous line about which a body rotates3.1.9rigid body modemode shape of a rotor correspond
43、ing to a rigid-body-mode resonance speed (3.1.4) for a given support system3.1.10flexural modemode shape of a rotor corresponding to a flexural resonance speed (3.1.5) for a given support system3.1.11shape function of the nth flexural moden(z)mathematical expression for the deflection shape of the r
44、otor in the corresponding flexural mode (3.1.10) normalized so that the maximum deflection is unityNote 1 to entry: Frequently, it is assumed that the modes are mutually orthogonal and the system is axially symmetric. This is not applicable in all cases.3.1.12modal amplification factorMnratio of the
45、 magnitude of the modal vibration displacement vector to the magnitude of the modal eccentricity for the nth flexural mode (3.1.10)Note 1 to entry: Modal amplification factor is a non-dimensional quantity. It is expressed for the nth mode asMnnnnn=+()()()22222142 ISO 2017 All rights reserved ISO 219
46、40-2:2017(E)where is the angular velocity expressed in radians per second;nis the undamped natural angular frequency expressed in radians per second;nis the modal damping ratio (3.1.13).Note 2 to entry: The modal amplification factor at the flexural resonance speed (3.1.5) is called “modal sensitivi
47、ty”.3.1.13modal damping rationmeasure of the damping effect on the nth flexural mode (3.1.10)3.2 Rotor systems3.2.1rigid behaviourrotor where the flexure caused by its unbalance (3.3.1) distribution can be neglected with respect to the agreed unbalance tolerance (3.4.12) at any speed up to the maxim
48、um service speed (3.1.6)Note 1 to entry: A rotor that behaves as rigid under one set of conditions e.g. service speed (3.1.6), initial unbalance (3.3.10) and unbalance tolerances (3.4.12) may not behave as rigid under another set of conditions.3.2.2flexible behaviourrotor where the flexure caused by
49、 its unbalance (3.3.1) distribution cannot be neglected with respect to the agreed unbalance tolerance (3.4.12) at any speed up to the maximum service speed (3.1.6)Note 1 to entry: Flexible behaviour includes shaft-elastic behaviour (3.2.3), settling behaviour (i.e. unbalance indication irreversibly changes after the first run-up) and component-elastic behaviour (i.e. unbalance indication reversibly changes with speed due to displacement of rotor components oth
