1、March 2017 English price group 15No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 21.120.40; 29.160.10!%c,$“2640901w
2、ww.din.deDIN ISO 21940-11Mechanical vibration Rotor balancing Part 11: Procedures and tolerances for rotors with rigid behaviour (ISO 2194011:2016),English translation of DIN ISO 21940-11:2017-03Mechanische Schwingungen Auswuchten von Rotoren Teil 11: Verfahren und Toleranzen fr Rotoren mit starrem
3、Verhalten (ISO 2194011:2016),Englische bersetzung von DIN ISO 21940-11:2017-03Vibrations mcaniques quilibrage des rotors Partie 11: Modes opratoires et tolrances pour rotors comportement rigide (ISO 2194011:2016),Traduction anglaise de DIN ISO 21940-11:2017-03SupersedesDIN ISO 19401:200404 andDIN IS
4、O 19401 Corrigendum 1:200504www.beuth.deDocument comprises 34 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.03.17 Introduction 71 Scope . 82 Normative references 83 Terms and definitions . 84 Pertinent aspects of balancing .
5、84.1 General . 84.2 Representation of the unbalance 84.3 Unbalance effects 94.4 Reference planes for unbalance tolerances 94.5 Correction planes . 114.5.1 General. 114.5.2 Rotors which need one correction plane only . 114.5.3 Rotors which need two correction planes 114.5.4 Rotors with more than two
6、correction planes 114.6 Permissible residual unbalance 125 Similarity considerations . 125.1 General 125.2 Permissible residual unbalance and rotor mass . 125.3 Permissible residual specific unbalance and service speed . 136 Specification of unbalance tolerances . 136.1 General 136.2 Derivation of t
7、he unbalance tolerances 136.3 Balance quality grade G 146.3.1 Classification 146.3.2 Special designs 146.3.3 Permissible residual unbalance .176.4 Experimental evaluation . 176.5 Unbalance tolerances based on bearing forces or vibrations 176.5.1 Bearing forces 176.5.2 Vibrations 186.6 Methods based
8、on established experience 187 Allocation of permissible residual unbalance to tolerance planes .187.1 Single plane . 187.2 Two planes . 187.2.1 General. 187.2.2 Limitations for inboard rotors 197.2.3 Limitations for outboard rotors . 198 Allocation of unbalance tolerances to correction planes 208.1
9、General 208.2 Single plane . 218.3 Two planes . 21Contents PageNational foreword 4 National Annex (informative) Bibliography 6 .A comma is used as the decimal marker.DIN ISO 21940-11:2017-03 2 10.4 Verification of the permissible residual unbalance 2210.4.1 General. 2210.4.2 Unbalance readings withi
10、n tolerance .2310.4.3 Unbalance readings out of tolerance .2310.4.4 Region of uncertainly 23Annex A (informative) Example of the specification of permissible residual unbalance based on balance quality grade G and allocation to the tolerance planes.24Annex B (informative) Specification of unbalance
11、tolerances based on bearing force limits .28Annex C (informative) Specification of unbalance tolerances based on established experience 30Annex D (informative) Rules for allocating unbalance tolerances from tolerance planes to correction planes 31Bibliography .349 Assembled rotors 219.1 General 219.
12、2 Balanced as a unit 219.3 Balanced on component level . 2110 Accounting for errors in the verification of permissible residual unbalances .2210.1 General 2210.2 Unbalance tolerance 2210.3 Combined error of unbalance measurements 22DIN ISO 21940-11:2017-03 3 National foreword The text of ISO 21940-1
13、1:2016 has been prepared by 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” (Secretariat: DIN, Germany), under German leadership of
14、this project. The responsible German body involved in its preparation was DIN-Normenausschuss Akustik, Lrmminderung und Schwingungstechnik im DIN und VDI (DIN and VDI Standards Committee Acoustics, Noise Control and Vibration Engineering), Working Committee NA 001-03-06 AA (NALS/VDI C 6) Auswuchten
15、und Auswuchtmaschinen. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. DIN shall not be held responsible for identifying any or all such patent rights. The DIN Standards corresponding to the International Standards referred to in
16、this document are as follows: ISO 19499 DIN ISO 19499 Standards series ISO 21940 Standards series DIN ISO 21940 The German Standards are given in National Annex NA. ISO 21940 consists of the following parts, under the general title Mechanical vibration Rotor balancing: Part 1: Introduction 1*) Part
17、2: Vocabulary 2*) Part 11: Procedures and tolerances for rotors with rigid behaviour 3*) Part 12: Procedures and tolerances for rotors with flexible behaviour 4*) Part 13: Criteria and safeguards for the in-situ balancing of medium and large rotors 5*) Part 14: Procedures for assessing balance error
18、s 6*)1*)Revision of ISO 19499:2007, Mechanical vibration Balancing Guidance on the use and application of balancing standards (in preparation) 2*)Revision of ISO 1925:2001, Mechanical vibration Balancing Vocabulary 3*) Revision of ISO 1940-1:2003 + Cor.1:2005, Mechanical vibration Balance quality re
19、quirements for rotors in a constant (rigid) state Part 1: Specification and verification of balance tolerances 4*)Revision of ISO 11342:1998 + Cor.1:2000, Mechanical vibration Methods and criteria for the mechanical balancing of flexible rotors 5*) Revision of ISO 20806:2009, Mechanical vibration Cr
20、iteria and safeguards for the in-situ balancing of medium and large rotors 6*) Revision of ISO 1940-2:1997, Mechanical vibration Balance quality requirements of rigid rotors Part 2: Balance errors DIN ISO 21940-11:2017-03 4 Part 21: Description and evaluation of balancing machines 7*) Part 23: Enclo
21、sures and other protective measures for the measuring station of balancing machines 8*) Part 31: Susceptibility and sensitivity of machines to unbalance 9*) Part 32: Shaft and fitment key convention 10*)Amendments This standard differs from DIN ISO 1940-1:2004-04 and DIN ISO 1940-1 Corrigendum 1:200
22、5-04 as follows: a) the Corrigendum has been integrated and the standard has been editorially revised, with the explanatory information regarding the application of the total permissible residual unbalance in the processes of balancing a rotor and verifying of its residual unbalance being given grea
23、ter emphasis; b) the specification of terms and definitions has been deleted; c) information specifying unbalance tolerances based on vibration limits has been deleted; d) according to international practice, symbols and indices have been taken over and have not been replaced by German abbreviations
24、 in the German translation. Previous editions DIN EN ISO 1940-1: 1993-12, 2004-04 DIN ISO 1940-1 Corrigendum 1: 2005-04 7*) Revision of ISO 2953:1999, Mechanical vibration Balancing machines Description and evaluation 8*) Revision of ISO 7475:2002, Mechanical vibration Balancing machines Enclosures
25、and other protective measures for the measuring station 9*) Revision of ISO 10814:1996, Mechanical vibration Susceptibility and sensitivity of machines to unbalance 10*) Revision of ISO 8821:1989, Mechanical vibration Balancing Shaft and fitment key convention DIN ISO 21940-11:2017-03 5 National Ann
26、ex NA (informative) Bibliography DIN ISO 19499, Mechanical vibration Balancing Guidance on the use and application of balancing standards DIN ISO 21940-2, Mechanical vibration Rotor balancing Part 2: Terms and definitions 11*)DIN ISO 21940-12, Mechanical vibration Rotor balancing Part 12: Procedures
27、 and tolerances for rotors with flexible behaviour DIN ISO 21940-12 Supplement 1, Mechanical vibration Rotor balancing Part 12: Procedures and tolerances for rotors with flexible behaviour Supplement 1: Procedure for balancing at multiple rotational speeds DIN ISO 21940-13, Mechanical vibration Roto
28、r balancing Part 13: Criteria and safeguards for the in-situ balancing of medium and large rotors DIN ISO 21940-14, Mechanical vibration Rotor balancing Part 14: Procedures for assessing balance errors DIN ISO 21940-21, Mechanical vibration Rotor balancing Part 21: Description and evaluation of bala
29、ncing machines DIN ISO 21940-23, Mechanical vibration Rotor balancing Part 23: Enclosures and other protective measures for the measuring station of balancing machines DIN ISO 21940-32, Mechanical vibration Rotor balancing Part 32: Shaft and fitment key convention 11*) At present at draft stage. DIN
30、 ISO 21940-11:2017-03 6 IntroductionRotor balancing is a procedure by which the mass distribution of a rotor (or part or module) is checked and, if necessary, adjusted to ensure the unbalance tolerance is met. This document covers the balancing of rotors with rigid behaviour. A rotor is said to be r
31、igid when the flexure of the rotor caused by its unbalance distribution can be neglected with respect to the agreed unbalance tolerance at any speed up to the maximum service speed. For these rotors, the resultant unbalance, and often moment unbalance, are of interest, which when combined are expres
32、sed as a dynamic unbalance of the rotor.The balancing machines available today enable residual unbalances to be reduced to very low limits. Therefore, it is necessary to specify an unbalance quality requirement for a balancing task, as in most cases it would not be cost-effective to reduce the unbal
33、ance to the limits of the balancing machine.In addition to specifying an unbalance tolerance, it is necessary to consider the errors introduced by the balancing process. This document takes into account the influence of these errors to distinguish clearly between the specified permissible residual u
34、nbalance and the reduced residual unbalance values to be achieved during the balancing process.Mechanical vibration Rotor balancing Part 11: Procedures and tolerances for rotors with rigid behaviourDIN ISO 21940-11:2017-03 7 1 ScopeThis document establishes procedures and unbalance tolerances for ba
35、lancing rotors with rigid behaviour. It specifiesa) the magnitude of the permissible residual unbalance,b) the necessary number of correction planes,c) the allocation of the permissible residual unbalance to the tolerance planes, andd) how to account for errors in the balancing process.NOTE In ISO 2
36、1940-14, the assessment of balancing errors is considered in detail. Fundamentals of rotor balancing are contained in ISO 19499 which gives an introduction to balancing.This document does not cover the balancing of rotors with flexible behaviour. Procedures and tolerances for rotors with flexible be
37、haviour are dealt with in ISO 21940-12.2 Normative referencesThere are no normative references in this document.3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 21940-2 apply.ISO and IEC maintain terminological databases for use in standardization at t
38、he following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp4 Pertinent aspects of balancing4.1 GeneralRotor balancing is a procedure by which the mass distribution of a rotor is examined and, if necessary, adjust
39、ed to ensure that the residual unbalance or vibration in service is within specified limits. It should be noted that the vibration in service can originate from sources other than unbalance.Rotor unbalance can be caused by design, material, manufacturing and assembly. Every rotor has an individual u
40、nbalance distribution along its length, even in series production.4.2 Representation of the unbalanceFor a rotor with rigid behaviour, different vectorial quantities can be used to represent the same unbalance as shown in Figure 1.DIN ISO 21940-11:2017-03 8 Figure 1 a) to c) shows different represen
41、tations in terms of resultant unbalance and resultant couple unbalance, whereas Figure 1 d) to f) shows different representations in terms of a dynamic unbalance in two planes.NOTE 1 The resultant unbalance vector can be located in any radial plane (without changing magnitude and angle), but the ass
42、ociated resultant couple unbalance is dependent on the location of the resultant unbalance vector.NOTE 2 The centre of unbalance is that location on the shaft axis for the resultant unbalance, where the resultant couple unbalance is a minimum.If single-plane balancing is sufficient (see 4.5.2) or wh
43、en considerations are made in terms of resultant unbalance and resultant couple unbalance (see 4.5.4), the representation in Figure 1 a) to c) is preferable.In the case of typical two-plane considerations, the representation in Figure 1 d) to f) is advantageous.4.3 Unbalance effectsResultant unbalan
44、ce and resultant moment unbalance (the latter can also be expressed as resultant couple unbalance) have different effects on forces on the bearings and on the vibration of the machine. In practice, therefore, both unbalances are often considered separately. Even if the unbalance is stated as a dynam
45、ic unbalance in two planes, it should be noted that in most cases there is a difference in effects if the unbalances predominantly form either a resultant unbalance or a resultant moment unbalance.4.4 Reference planes for unbalance tolerancesIt is recommended to use reference planes to state the unb
46、alance tolerances. For these planes, only the magnitude of each residual unbalance needs to stay within the respective balance tolerance whatever the angular position may be.The aim of balancing is usually to reduce vibrations and forces transmitted through the bearings to the environment. For the p
47、urposes of this document, the reference planes for unbalance tolerances are taken to be the bearing planes. However, this use of bearing planes does not always apply.NOTE For a component without a shaft (e.g. a disc shaped element), but where the final bearing positions are known (or can be estimated), these planes can be used.DIN ISO 21940-11:2017-03 9 Unbalances in g
