EN ISO 13753-2008 en Mechanical vibration and shock - Hand-arm vibration - Method for measuring the vibration transmissibility of resilient materials when loaded by the hand-arm sy.pdf

1、BS EN ISO13753:2008ICS 13.160NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDMechanical vibrationand shock Hand-arm vibration Method for measuringthe vibrationtransmissibility ofresilient materialswhen loaded by thehand-arm system (ISO13753:1998)This British Sta

2、ndardwas published underthe authority of theStandards Policy andStrategy Committee on 30November 2008 BSI 2008ISBN 978 0 580 61854 3Amendments/corrigenda issued since publicationDate CommentsBS EN ISO 13753:2008National forewordThis British Standard is the UK implementation of EN ISO 13753:2008.It i

3、s identical to ISO 13753:1998. It supersedes BS EN ISO 13753:1999which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee GME/21/6, Human exposure to mechanical vibration andshock.A list of organizations represented on this committee can be obtained onrequest to

4、 its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 13753June 200

5、8ICS 13.160 Supersedes EN ISO 13753:1998 English VersionMechanical vibration and shock - Hand-arm vibration - Methodfor measuring the vibration transmissibility of resilient materialswhen loaded by the hand-arm system (ISO 13753:1998)Vibrations et chocs mcaniques - Vibrations main-bras -Mthode pour

6、mesurer le facteur de transmission desvibrations par les matriaux rsilients chargs par lesystme main-bras (ISO 13753:1998)Mechanische Schwingungen und Ste - Hand-Arm-Schwingungen - Verfahren zur Messung derSchwingungsbertragung elastischer Materialien unterBelastung durch das Hand-Arm-System (ISO 13

7、753:1998)This European Standard was approved by CEN on 25 May 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical

8、references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN membe

9、r into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latv

10、ia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels

11、2008 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 13753:2008: EBS EN ISO 13753:2008EN ISO 13753:2008 (E) 3 Foreword The text of ISO 13753:1998 has been prepared by Technical Committee ISO/TC 108 “Mechanical vibration and shock

12、” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 13753:2008 by Technical Committee CEN/TC 231 “Mechanical vibration and shock” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by pu

13、blication of an identical text or by endorsement, at the latest by December 2008, and conflicting national standards shall be withdrawn at the latest by December 2008. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CEN

14、ELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 13753:1998. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EC Dir

15、ective(s). For relationship with EC Directive(s), see informative Annexes ZA and ZB, which are integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Be

16、lgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement noti

17、ce The text of ISO 13753:1998 has been approved by CEN as a EN ISO 13753:2008 without any modification. BS EN ISO 13753:2008EN ISO 13753:2008 (E) 4 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC, amended by Directive 98/79/E

18、C This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Directive 98/37/EC on machinery, amended by 98/79/EC. Once this standard is cited

19、in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard confers, within the limits of the scope of this standard, a presumption of conformity with the

20、 Essential Requirement 1.5.9 of that Directive and associated EFTA regulations. WARNING Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard. BS EN ISO 13753:2008EN ISO 13753:2008 (E) 5 Annex ZB (informative) Relationship between th

21、is European Standard and the Essential Requirements of EU Directive 2006/42/EC This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Direc

22、tive 2006/42/EC on machinery. Once this standard is cited in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard confers, within the limits of the sc

23、ope of this standard, a presumption of conformity with the Essential Requirement 1.5.9 of that Directive and associated EFTA regulations. WARNING Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard. BS EN ISO 13753:2008ISO ISO 1375

24、3:1998(E)iiiIntroductionThis International Standard was developed in response to the growingdemand to protect people from the risks of vibration damage caused byexposure to hand-transmitted vibration.Various standards refer to measurement and assessment of risk tovibration exposure and to methods of

25、 type testing specific tools andprocesses.Resilient materials are used to cover handles and make gloves. It is hopedthat both of these will reduce the magnitude of the vibration exposure. ThisInternational Standard describes a method of measuring the vibrationattenuation of a sample of the material

26、in the form of a flat sheet or layer.In some cases the material may be of two or more layers forming a sheet.It is a laboratory measurement and offers a reproducible and reliableprocedure.This International Standard assumes that the material behaves in a linearway and that it has negligible mass com

27、pared with the mass loading. (Acorrection could be made for the material mass if required.) The methoddetermines the impedance of the material when loaded by a massproviding a compression force equivalent to that found when the material isgripped by the hand. This is done by measuring the transfer f

28、unction of themass-loaded material at all the required frequencies. The vibrationtransmission when loaded by the hand is computed using standard valuesof hand-arm impedance and the measured values of the materialimpedance. The impedances used in this International Standard are for thepalm of the han

29、d when gripping a circular handle. The resultingtransmissibility may not be applicable to the fingers. The impedance for thezhdirection of the hand-arm system where the material is undercompression is used. The mathematical basis of the method is contained inannex B.If the results of this measuremen

30、t procedure show transmissibilities greaterthan 0,6 at all frequencies up to 500 Hz, then the material would probablynot provide greater attenuation in the practical situation in the samefrequency range. In the practical situation, the transmissibility as a functionof frequency should be appropriate

31、 to the frequency spectrum of thesource.BS EN ISO 13753:2008BS EN ISO 13753:2008INTERNATIONAL STANDARD ISO ISO 13753:1998(E)1Mechanical vibration and shock Hand-arm vibration Methodfor measuring the vibration transmissibility of resilient materialswhen loaded by the hand-arm system1 ScopeThis Intern

32、ational Standard specifies a procedure to determine the vibration transmissibility of a resilient materialwhen loaded by the hand-arm system.The method is applicable to all materials which behave in a linear way. It is expected that this is realized in mostelastic foam and rubber materials and, prov

33、isionally, in woven cloths. The method can be applied to mixed systems,e.g. a cloth material attached to a foam or rubber base.It is expected that the results of this laboratory test will be used in screening materials used for vibration attenuationon the handles of tools and for gloves. This will e

34、nable rank ordering of materials for gloves, but will not necessarilypredict the transmissibility of the gloves fabricated from these materials (for this purpose, see ISO 10819).2 Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisi

35、ons of thisInternational Standard. At the time of publication, the editions indicated were valid. All standards are subject torevision, and parties to agreements based on this International Standard are encouraged to investigate thepossibility of applying the most recent editions of the standards in

36、dicated below. Members of IEC and ISO maintainregisters of currently valid International Standards.ISO 2041:1990, Vibration and shock Vocabulary.ISO 5349:1986, Mechanical vibration Guidelines for the measurement and the assessment of human exposureto hand-transmitted vibration.ISO 5805:1997, Mechani

37、cal vibration and shock Human exposure Vocabulary.ISO 10068:1), Mechanical vibration and shock Free, mechanical impedance of the human hand-arm system atthe driving point.3 DefinitionsFor the purposes of this International Standard, the definitions given in ISO 2041, ISO 5349 and ISO 5805 apply.NOTE

38、 For hand-transmitted vibration, see ISO 5805. For transmissibility, see ISO 2041._1) To be published.BS EN ISO 13753:2008ISO 13753:1998(E)ISO24 SymbolsThe following symbols are used:a1acceleration measured on the shakera2acceleration measured on the mass m loading the materialreal subscript used to

39、 denote the real part of a complex quantityimag subscript used to denote the imaginary part of a complex quantity denotes modulus of a complex quantitym mass loading the resilient materialT transmissibilityZMimpedance of the resilient materialZHimpedance of the hand-arm system. This value is obtaine

40、d from ISO 10068 (see annex A).w angular frequencyj denotes the square root of minus oneAi(jw) or in short Ai: Fourier transform of ai.EXAMPLE:()()AA1realjjww2denotes the real part of the complex ratio A1(jw) and A2(jw).5 PrincipleThe method uses a vibration excitation system (shaker) on which the r

41、esilient material is placed with the loadingmass m on the top. Accelerometers measure the vibration on the shaker, a1, and the vibration of the mass m, a2.The shaker may be driven by a wide-band random signal or a sinusoidal signal.6 Measuring equipment6.1 General requirementsA frequency analyser (p

42、referably twin-channel), two transducers and two channels of measuring equipment arerequired.The measuring setup is shown in figure 1.6.2 Acceleration transducers and preamplifiersThe transducers (accelerometers) and preamplifiers chosen shall be suitable for the frequency range 5 Hz to1 000 Hz. An

43、overload indication shall be provided.6.3 Transducer mountingThe two transducers shall be rigidly mounted to flat surfaces on the shaker and the loading mass m. The mountingmay be achieved using a screw, glue or beeswax. The mounting shall be such that the transfer function betweenthe two transducer

44、s is unity up to at least 1 000 Hz without the material sample.BS EN ISO 13753:2008ISOISO 13753:1998(E)3Key1 Mass m2 Resilient material3 ShakerFigure 1 Measurement setup7 Test sample and mass mThe sample shall be flat and of constant thickness, containing a circular area of at least 45 mm radius. Th

45、e sampleshould not spread over the edge of the shaker table. A circular cylinder of metal (e.g. steel), with radius 45 mm andmass 2,5 kg shall be used to load the resilient material.8 Measurement procedure8.1 Measure simultaneously the accelerations a1and a2, measured on the shaker and on top of the

46、 mass m.8.2 The shaker may be excited using a wide-band random signal. The power spectral density should be constantwithin 10 % between 10 Hz and 500 Hz with a magnitude of at least 2,5 10-2(m/s2)2/Hz.8.3 Alternatively, the shaker may be excited by sinusoidal signals. The excitation magnitude a1shou

47、ld be at least1 m/s2.NOTE The coherence function of the two signals should be measured at each frequency and should be greater than 0,95,although it may fall lower than this value at the resonance frequency.8.4 Measurement of the ratio A1/A2shall be performed (in terms of both modulus and phase or i

48、n terms of real andimaginary parts) at each frequency. This ratio is a complex function.8.5 For the purpose of the test report, measurement of transmissibility should be made at the one-third-octaveband centre frequencies between 50 Hz and 500 Hz. It is recommended to measure at lower frequencies, d

49、own to10 Hz, if possible.9 Evaluation of resultsFirst determine the material impedance ZMand use this value with the hand-arm impedance ZHto determine thetransmissibility.BS EN ISO 13753:2008ISO 13753:1998(E)ISO49.1 Determination of material impedance ZMThe material impedance is calculated using equation (1):ZmAAMj=w121. . . (1)9.2 Determination of the transmissibility TThe transfer function A2/A1when the material is loaded by the hand-arm system is the required vibrationtransmissibility.