1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS ISO 10767-2:1999 ICS 2
2、3.100.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Hydraulic fluid power Determination of pressure ripple levels generated in systems and components Part 2: Simplified method for pumpsThis British Standard, having been prepared under the direction of the Engineering Sect
3、or Committee, was published under the authority of the Standards Committee and comes into effect on 15 November 1999 BSI 11-1999 ISBN 0 580 35385 0 BS ISO 10767-2:1999 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard reproduces verbatim ISO 10767-2:1
4、999 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee MCE/18, Fluid power systems and components, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committ
5、ee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-referen
6、ces The British Standards which implement international publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A Britis
7、h Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front
8、cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 20, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.A Referencenumbe r ISO107672:1999 (E) INTERNATIONAL STANDARD ISO 107672 Firstedition
9、 19991001 HydraulicfluidpowerDeterminationof pressureripplelevelsgeneratedinsystems andcomponents Part2: Simplifiedmethodforpumps TransmissionshydrauliquesDterminationdesniveauxdonde depressionengendrsdanslescircuitsetcomposants Partie2:MthodesimplifiepourlespompesISO107672:1999(E) ii Contents 1Scop
10、 e1 2Normativereference s1 3Termsanddefinition s.1 4Symbolsandunit s.2 5Instrumentatio n3 6Generalprovision s3 7Determinationofgeometricparametersandspeedofsoundinthetestflui d3 8Validfrequencyandpressurerang e4 9Testcircui t4 10Testprocedur e.6 11Datapresentation. 6 12Identificationstatement (Refer
11、encetothispartofISO10767 )7 AnnexA (normative) Testreportform s8 AnnexB (informative) Tutorialexplanationofthebasisforthetestproceduregiveninthispartof ISO10767formeasuringpumppressurerippl e10 Bibliography20 ISO107672:1999(E) iii Foreword ISO (the InternationalOrganizationforStandardization)isaworl
12、dwidefederationofnationalstandardsbodies(ISO memberbodies).TheworkofpreparingInternationalStandardsisnormallycarriedoutthroughISOtechnical committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhas therighttoberepresentedonthatcommittee.Internationalorganizations,g
13、overnmentalandnongovernmental,in liaisonwithISO,alsotakepartinthework.ISOcollaboratescloselywiththeInternationalElectrotechnical Commission(IEC)onallmattersofelectrotechnicalstandardization. InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part3. DraftInternational
14、Standardsadoptedbythetechnicalcommitteesarecirculatedtoth ememberbodiesforvoting. PublicationasanInternationalStandardrequiresapprovalbyatleast75%ofthememberbodiescastingavote. InternationalStandardISO107672waspreparedbyTechnicalCommitteeISO/TC131,Fluidpowersystems, SubcommitteeSC8, Producttesting.
15、ISO 10767 consists ofthefollowingparts,underthegeneraltitle HydraulicfluidpowerDeterminationofpressure ripplelevelsgeneratedinsystemsandcomponents : Part1:Precisionmethodforpumps Part2:Simplifiedmethodforpumps Part3:Methodformotors AnnexAformsanormativepartofthispartofISO10767.AnnexesBandCareforinfo
16、rmationonly.ISO107672:1999(E) iv Introduction Inhydraulicfluidpowersystems,poweristransmittedandcontrolledthroughaliquidunde rpressurewithinan enclosedcircuit.Hydraulicpumpsaredeviceswhichconvertrotarymechanicalpowerintofluidpower.Pumpflow hasalarge,steadycomponentandasmaller,cyclicalcomponentsuperi
17、mposeduponit.I tisthissmaller,cyclical componentofthepumpflowthatreactswiththefluidsystemofthepumpanditscircuit,thatresultsinpressure rippleorfluidbornenoise.Thisfluidbornenoisecanbetransmittedthroughtheliquidunderpressuretoother attachedcomponentsandstructures,andcanresultinunwantednoiseandvibratio
18、ns. While the flow ripple is the cause of the pressureripple,itismoredifficulttomeasure.Thereforepressureripplewill beusedinthisproceduretocharacterizethefluidbornenoisegenerationpotentialofhydraulic fluidpowerpumps. Pressurerippleisafunctionofthepumpdesignandthecircuitinwhichitismeasured.Itisimport
19、ant,therefore, thatthetestcircuitbecontrolledsoastoprovideuniformresultswhencomparin gthefluidbornenoisegeneration potential of different types of pumps. PressurerippledeterminedinaccordancewiththispartofISO10767maybe differenttothatmeasuredinfluidpowersystemsbecauseofthehighimpedanceofthetestline.I
20、NTERNATIONALSTANDARD ISO107672:1999(E) 1 HydraulicfluidpowerDeterminationofpressureripplelevels generatedinsystemsandcomponents Part2: Simplifiedmethodforpumps 1Scope ThispartofISO 10767specifiesaprocedureformeasuringthefluidpressureripplecharacteristicsofhydraulicfluid powerpumpswithamaximumerrorof
21、+1dBto -3B. ISO 10767 1 can be used if pressure ripplemeasurementsatlowerpressurelevels,lowerfrequencies,oratgreater accuracylevelsisrequired.Thisprocedurecoversafrequencyandpressurerangethathasbeenfoundtoexcite manycircuitstoemitairbornenoisethatmostconcernsdesignersofhydraulicflui dpowersystems.It
22、allowsthe pressurerippledatatobepublishedwithminimalcalculationsandprocessingofthemeasureddata.Thispartof ISO 10767promotesquieterfluidpowersystemsbyestablishingauniformprocedureformeasuringandreporting thefluidpressureripplecharacteristicsofhydraulicfluidpowerpumps.Annex Bcontainsatutorialexplanati
23、onof thetechnicalbasisforthistestprocedure. 2Normativereferences The following normativedocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsof thispartofISO 10767.Fordatedreferences,subsequentamendmentsto , or revisions of, any of these publications donotapply.However,part
24、iestoagreementsbasedonthispartofISO 10767areencouragedtoinvestigatethe possibilityofapplyingthemostrecenteditionsofthenormativedocumentsindicatedbelow.For undated references,thelatesteditionofthenormativedocumentreferredtoapplies.MembersofISOandIE Cmaintain registersofcurrentlyvalidInternationalStan
25、dards. ISO1000:1992, SIunitsandrecommendationsfortheuseoftheirmultiplesandofcertain otherunits. ISO12191:1991,Fluidpowersystemsandcomponents Graphicsymbolsandcircuitdiagrams Part 1: Graphicsymbols. ISO5598:1985, FluidpowersystemsandcomponentsVocabulary. ISO91101:1990, HydraulicfluidpowerMeasurementt
26、echniquesPart1:Generalmeasurementprinciples. ISO107671:1996, HydraulicfluidpowerDeterminationofpressureripplelevelsgeneratedinsystemsand componentsPart1:Precisionmethodforpumps. 3Termsanddefinitions ForthepurposesofthispartofISO 10767,thefluidpower termsanddefinitionsgiveninISO 5598,theacoustical te
27、rmsanddefinitionsgiveninISO107671andthefollowingapply.ISO107672:1999(E) 2 3.1 pumpoutletportpassagelength L S averagelengthfromthevolumeexchangecavitiesofthepumptotheentranceo f the test line in normal operation at thetestconditionsspecified 3.2 pumpoutletportpassagediameter D S average diameter of
28、thedischargecavityfromthevolumeexchangecavitiesofthepumptotheentranceofthetest lineinnormaloperationatthetestconditionsspecified 4Symbolsandunits 4.1 ForthepurposesofthispartofISO10767,thesymbolsgiveninTable1apply. Table1Symbols Symbol Quantity B bulkmodulusofelasticityofthetestfluid c 0 referencesp
29、eedofsoundintestfluidnotcorrectedfortestlineelasticity D L insidediameteroftestline D O,min minimumlineterminationorificediameter D O,max maximumlineterminationorificediameter D S pumpoutletportpassagediameter E modulusofelasticityoftestlinematerial f 1 fundamentalpumpingfrequency f max maximumfrequ
30、encylimitoftestprocedure K orificefl owc oefficient, K= D 4 O 2 q ppD (1) L L testlinelength L S pumpoutletportpassagelength Z numberofpumpingchambersperrevolution n harmonicnumber n=1,2,3,. N pumpshaftspeed P n amplitudeof nthharmonicofpressureripple(i.e.ofpeaktopeak) p RMS therootmeansquare(RMS)av
31、erageofthepressurerippleharmonicsfrom f 1 to f max p max maximumpumpoutlettestpressure p min minimumpumpoutlettestpressure D p orificepressuredrop q averagepumpflowrate r massdensityoftestfluid t wallthicknessoftestline V S pumpoutletpassagevolume ISO107672:1999(E) 3 4.2 UnitsusedinthispartofISO1076
32、7areinaccordancewithISO1000. 4.3 GraphicsymbolsusedinthispartofISO10767areinaccordancewithISO12191unlessotherwisestated. 5Instrumentation 5.1 Theinstrumentsusedtomeasureflow,pressure,drivespeed , and oil temperature shall be in accordance with therecommendationsinISO91101. 5.2 Pressuretransducersfor
33、measuringpressurerippleshallbepiezoelectric typetransducerscapableof accuratemeasurementsfromthepumpdriveshaftfrequencyupt o10kHzminimuminaccordancewith ISO91101. 5.3 Theharmoniccontentofthepressurerippleshallbeestablishedasafunctio noffrequency.Thismaybe achievedusingaFastFourierTransform(FFT)narro
34、wbandspectrumanalyzer.Theanalysisshallproduce accuratemeasurementsfromdriveshaftfrequencyupto10kHzminimuminaccordancewithISO91101. 6Generalprovisions 6.1 Controltheaveragepressure,driveshaftspeed,andfluidtemperaturetoaclass Baccuracylevelin accordancewithISO91101. 6.2 Usethetestfluidforwhichpressure
35、rippledataisdesired.Makesurethatthetestfluidisacceptableforuse withthetestpump. 6.3 Useextracarewheninstallingpumpinletlinestomaintaintheinletpressurewithinthemanufacturersrated conditionsandtopreventairfromleakingintothecircuit. 6.4 “Runin“thepumpinaccordancewiththemanufacturersrecommendationsprior
36、torunningtests. 6.5 Runthepumptopurgeairfromalllinesandcircuitcomponentspriortorunnin gtests.Alltestconditionsshall bestabilizedwithinthelimitsspecifiedin6.1. 6.6 Use extra care toensurethattheoperatingpressureofthetestlines,components,andthetestpumpdoesnot exceedthemanufacturersratings.Donotinstall
37、anyadditionalcomponents tothetestcircuitbecausethiscan affecttheaccuracyofthemeasurements. WARNING Linepressureisdeterminedbypumpflowandtheorificesizeselectedforthetestcircuit. Incorrectorificesizecanresultinextremelinepressure.Takethenecessarysafet y precautions to protect bothtestequipmentandperso
38、nnelfromextremelinepressure. 7Determinationofgeometricparametersandspeedofsoundinthetestfluid 7.1 Valuesfor D S and L S canbeobtainedinanyoneofthefollowingways: a) usingthediameterofthepumpoutle tportasanapproximationofD S andcalculating L S fromtitration measurementsofthepumpoutletportvolume V S us
39、ingthefollowingequation: S S 4 L D V p S 2 (2) NOTE V S includesallfittingsuptotheentranceofthetestline. b) fromthemanufacturerofthetestpump;ISO107672:1999(E) 4 c) byestimationfromtheresultsofatestprocedurethatmeasurestheinternalimpedanceofthetestpump(e.g. ISO107671). 7.2 Valuesforthespeedofsoundint
40、hetest fluidc 0 andthetestfluidmassdensity rcanbeobtainedfromthe manufacturerofthefluid.Thespeedofsoundinthetestfluidcanbecorrectedfortheelasticityofthetest line using thefollowingequation: c= c + D + t E 1 1( ) 0 L 2 r t (3) 7.3 Ifavalueforthespeedofsoundinthetestfluid c 0 isnotavailablefromthemanu
41、facturerofthefluiditmaybe estimatedusingthefollowingequation: cB 0 = /r (4) 8Validfrequencyandpressurerange 8.1 Thefundamentalpumpingfrequencyis f 1 .Itisthelowestfrequencyofthepumppressurerippl ethatcanbe measuredwiththistestprocedure. f ZN 1 = 60 (5) where Nisexpressedinrotationsperminuteinorderto
42、give f 1 inhertz. 8.2 Theminimumpumpoutletpressurethatcanbemeasuredwiththistestprocedureis p min . min S 2 tan 2 p q = c f L c r p p D S 2 1 (6) 8.3 Thehighestfrequencythatcanbemeasuredwiththistestprocedur e is 2,5 kHz or f max ,whicheveristhelower limit.Thefollowingequationisusedtocalculate f max :
43、 max S 1 2 f = c L f - (7) 8.4 p max is defined as the maximum pumpoutletpressurewherepressurerippledataisdesired. p max shallbeless thanthemaximumpumpoutletpressureallowedbythepumpmanufacturerandshal l comply with the requirements of6.6. 8.5 Acceptablepressureripplemeasurementscanbeobtainedwiththis testprocedureatpumpoutletpressures from p min to p max andoverafrequencyrangefrom f 1 to f max or
