1、ANSI/AGMA 6025-D98Revision of ANSI/AGMA 6025-C90Reaffirmed January 2010American National StandardSound for Enclosed Helical,Herringbone and Spiral BevelGear DrivesANSI/AGMA6025-D98iiSound for Enclosed Helical, Herringbone and Spiral Bevel Gear DrivesANSI/AGMA 6025-D98(Revision of ANSI/AGMA 6025-C90)
2、ApprovalofanAmericanNationalStandardrequiresverificationbyANSIthattherequire-ments for due process, consensus and other criteria for approval have been met by thestandards developer.Consensusisestablishedwhen,inthejudgmentoftheANSIBoardofStandardsReview,substantial agreement has been reached by dire
3、ctly and materially affected interests.Substantialagreementmeansmuchmorethanasimplemajority,butnotnecessarilyuna-nimity. Consensus requires that all views and objections be considered, and that aconcerted effort be made toward their resolution.TheuseofAmericanNationalStandardsiscompletelyvoluntary;t
4、heirexistencedoesnotin any respect preclude anyone, whether he has approved the standards or not, frommanufacturing, marketing, purchasing or using products, processes or procedures notconforming to the standards.The American National Standards Institute does not develop standards and will in nocirc
5、umstances give an interpretation of any American National Standard. Moreover, noperson shall have the right or authority to issue an interpretation ofan American NationalStandardinthenameoftheAmericanNationalStandardsInstitute. Requestsforinterpre-tation of this standard should be addressed to the A
6、merican Gear ManufacturersAssociation.CAUTION NOTICE: AGMA technical publications are subject to constant improvement,revision or withdrawal as dictated by experience. Any person who refers to any AGMAtechnicalpublicationshouldbesurethatthepublicationisthelatestavailablefromtheAs-sociation on the su
7、bject matter.Tablesorotherself-supportingsectionsmaybequotedorextracted. Creditlinesshouldread: Extracted from ANSI/AGMA 6025-D98, Sound for Enclosed Helical, Herringboneand Spiral Bevel Gear Drives, with the permission of the publisher, the American GearManufacturers Association, 1500 King Street,
8、Suite 201, Alexandria, Virginia 22314.Approved June 19, 1998ABSTRACTThe standard describes a recommended method of acceptance testing and reporting of the sound pressurelevels generated by a gear speed reducer or increaser when tested at the manufacturers facility. The resultsobtainedshouldrepresent
9、onlythesoundofthegearunit. Othersystemsinfluencedsuchastheprimemoverordrivenequipmentareminimized. Thepurchasershouldnotexpecttotranslatethemanufacturerstestresultsdirectlytothesysteminstallationbecauseofdifferencesinenvironment,mountingandsystemeffects. Anan-nex is included for use in those instanc
10、es where sound power levels are required by the purchaser.Published byAmerican Gear Manufacturers Association1500 King Street, Suite 201, Alexandria, Virginia 22314Copyright 1998 by American Gear Manufacturers AssociationAll rights reserved.No part of this publication may be reproduced in any form,
11、in an electronicretrieval system or otherwise, without prior written permission of the publisher.Printed in the United States of AmericaISBN: 1-55589-718-5AmericanNationalStandardANSI/AGMA 6025-D98AMERICAN NATIONAL STANDARDiiiContentsPageForeword iv.1 Scope 12 Normative references 1.3 Definitions 14
12、 Measuring instrumentation used 2.5 Test procedure 26 Sound measurement 3.7 Acceptance criteria 4.8 Typical sound levels 49 Measurement report 4Tables1 Distance between major vertical surface and microphone (for soundpressure measurements) 32 Corrections for ambient sound pressure levels 4.Figures1
13、Sound test microphone position 32 Typical maximum sound level vs. high speed mesh pitch line velocity 5.3 Typical high speed gear drive maximum sound pressure levels 5.4 Typical maximum sound level vs. catalog power rating 6AnnexesA Gear unit sound power determination 7.B Obtaining an average level
14、from different sound pressure levels on an energybasis 15C Determination of the environmental correction factor, K2, with the aid of areference sound source 17D Special contractual considerations 19Bibliography 21ANSI/AGMA 6025-D98 AMERICAN NATIONAL STANDARDivForewordThe foreword, footnotes and anne
15、xes, if any, in this document are provided forinformationalpurposesonlyandarenottobeconstruedasapartofANSI/AGMAStandard6025-D98, Sound for Enclosed Helical, Heringbone and Spiral Bevel Gear Drives.Concern with industrial noise created a need for acoustical standards covering all typesofgear products
16、. Noise measurement and control is dependent upon the individualcharacteristicsoftheprimemover,gearunitanddrivenmachineaswellastheircombinedeffects as a system in addition to the effects of the acoustic environment.The complexity makes most sound standards difficult to apply or interpret properly. T
17、heAGMA Acoustical Technology Committee developed this standard for the purpose ofprovidingimprovedcommunicationbetweenpurchaser,gearmanufactureranduserintheareas of sound instrumentation, sound measurements and test procedures.Becauseofthemanyvariationsofsystemresponseindifferentacousticenvironments
18、,thisstandard identifies certain areas where special test conditions might be necessary andshould be part of the contractual agreement between purchaser and gear manufacturer.The first draft of ANSI/AGMA 6025-C90 was prepared in January 1989 as a revision ofAGMA297.02. AGMA297.01wasfirstapprovedbyth
19、eAGMAmembershipinJulyof1973.The standard presented the A-weighted sound pressure level measurement proceduresforenclosedhelical,herringboneandspiralbevelgeardrives. WorkbeganonarevisionofAGMA 297.01 in 1979 to update the terminology and to add an appendix, a procedure forsound power measurements. AG
20、MA 297.02 was approved for printing and distribution in1983. This revision of AGMA 297.02 also incorporates AGMA 295.04 and AGMA 298.01,which were similar in content.ANSI/AGMA 6025-C90 was approved by the AGMA membership and the AmericanNational Standards Institute in 1990. This revision of the 1990
21、 standard is a modificationincorporating the procedures from ISO 8579-1:1993 as a normative annex, updating ofreferences and including additional information.Therearefourannexesinthisstandard. AnnexAisnormativeandisconsideredpartofthisstandardwhenspecified;AnnexesB,CandDareinformativeandarenotconsid
22、eredpartofthis standard.ANSI/AGMA 6025-D98 was approved by the AGMA membership in March 1998. It wasapproved as an American National Standard on June 19, 1998.Suggestionsforimprovementofthisstandardwillbewelcome. TheyshouldbesenttotheAmerican Gear Manufacturers Association, 1500 King Street, Suite 2
23、01, Alexandria,Virginia 22314.ANSI/AGMA 6025-D98AMERICAN NATIONAL STANDARDvPERSONNEL of the AGMA Acoustical Technology CommitteeChairman: D.D. Behlke Twin Disc, IncVice Chairman: R.A. Schunck The Falk CorporationACTIVE MEMBERSJ.B. Amendola MAAG Gear Company, LtdJ.V. Lisiecki The Falk CorporationJ. L
24、uz General Electric Company.J.L. Radovich Davis-StandardASSOCIATE MEMBERSE.J. Bodensieck Bodensieck EngineeringD.L. Borden Gear Research InstituteF. Choy University of Akron.D. Cressman Philadelphia Mixers Corporation.M.F. Dalton General Electric CompanyJ.M Franchuk WesTech Gear CorporationD.R. Hous
25、er Ohio State University.G. Kempf General Motors CorporationA.J. Lemanski Penn State UniversityL. Lloyd Lufkin Industries, IncW. Mark Penn State University.D.A. McCarroll The Gleason Works.W. Nageli MAAG Gear Company, Ltd.G. Nagorny Nagorny ANSI/AGMA 6011-H97, Practice for HighSpeed Helical and Herr
26、ingbone Gear Units; ANSI/AGMA 6019-B89, Standard for Gearmotors UsingSpur, Helical, Herringbone, Straight Bevel or SpiralBevelGears;andANSI/AGMA6021-G89,Standardfor Shaft Mounted and Screw Conveyor DrivesUsing Spur, Helical and Herringbone Gears.ANSI/AGMA 6025-D98 applies to only those gearunits whi
27、ch are lubricated in accordance withmanufacturers recommendations and tested in asystemofconnectedrotatingpartsfreefromseriouscritical speeds, torsional vibrations or overloads astested at the gear unit manufacturers facility.Where performance of actual shop tests todetermine sound level is required
28、, it shall be theresponsibility of the purchaser to so state in hisinquiry and order.NOTE: The gear unit is only part of the total acousticsystem which includes, in addition to the gear unit, theprime mover, driven equipment, gear unit mounting,foundation and acoustic environment. Each of thesemight
29、 affect the measured level of sound emitted fromthe gear unit. Unless otherwise agreed, the gearmanufacturers responsibility is to ensure that the levelof noise emitted from a gear unit under the test condi-tions in his factory is within contractually specified ornegotiated limits.Special contractua
30、l considerations are discussed inannex D.CAUTION: Compliance with this standard does notconstitute a warranty of the measured gear unit soundlevels under installed field service conditions.2 Normative referencesThe following standards contain provisions which,throughreferenceinthistext,constitutepro
31、visionsofthis American National Standard. At the time ofpublication, the editions indicated were valid. Allstandards are subject to revision, and parties toagreements based on this American NationalStandardareencouragedtoinvestigatethepossibil-ity of applying the most recent editions of thestandards
32、 indicated below.ANSI S1.1(1994), Acoustical terminologyANSI S1.4 (1983), Specification for sound levelmetersANSI S1.6 (1984), Preferred frequencies and bandnumbers for acoustical measurementsANSI S1.11 (1986), Octave, half-octave and third-octave band filter setsANSI S1.13 (1995), Methods for the m
33、easurementof sound pressure levelNOTE: These standards may be obtained from:American National Standards Institute11 West 42nd StreetNew York, NY 10036(212) 642-49003 DefinitionsThe following definitions are provided to identifyspecific terms and phrases used in this standard.ANSI/AGMA 6025-D98 AMERI
34、CAN NATIONAL STANDARD2A-weighted sound pressure level (dBA): Themeasurement obtained from a sound level meterhaving an A-weighting network conforming to ANSIS1.4, Specification for Sound Level Meters, whichfilters the frequency content of the sound pressuremeasurement to match the human ears sensiti
35、vity.acoustics: Science of sound.acoustic environment: Surroundings of a soundsource which determine the type of sound field(direct, reflected or combination of direct and re-flected sound) the source will create.ambient sound: All sound associated with a givenacoustic environment which is not gener
36、ated by thegear unit or associated equipment required for itsoperation.decibel (dB): Unit of measure for sound pressurelevel.isolation: Resistance to the transmission of soundby materials and structures.octave band analyzer: An instrument for themeasurement of sound pressure levels withinprescribedr
37、angesoffrequencyorfrequencybands,see ANSI S1.6.semi-reverberant acoustic environment: Thesurroundings of a sound source composed ofboundaries which are neither completely sound-absorbing nor completely sound-reflecting, whichcreate a sound field that is a combination of bothdirect and reflected soun
38、d.slowmeterresponse: Soundpressurelevelmetersettingthatincludesdampingtoreducefluctuations.sound: Aperiodicpressurevariationinamediumorthe resulting hearing sensation caused by thepressure variation.sound level: Weighted sound pressure levelobtained by the use of a weighting network (A, B orC) of a
39、sound level meter. In this standard soundlevel means the A-weighted sound pressure level(dBA).sound level meter: An instrument for measuringthe root mean square (rms) level of sound with anA-weighting network which alters the frequencyresponse in a prescribed manner.sound pressure, P: A dynamic vari
40、ation in atmo-spheric pressure. The pressure at a point in spaceminus the static pressure at that point.sound pressure level, Lp: The fundamentalmeasure of sound pressure. Defined as:Lp= 20logPPo,dB.(1)(normally stated as dB re 20 mPa)whereP is the rms value of sound pressure inPascals,Pa(1.0Pa=1.0N
41、/m2).Pois the measurement reference pressure inPascals, Pa, taken as 20 mPa for soundmeasurement in air.4 Measuring instrumentation used4.1 Sound level meterThesoundlevelistobemeasuredwitheitheraType1(precision)orType2(generalpurpose)soundlevelmeter per ANSI S1.4.4.2 Octave band meterOctave band sou
42、nd pressure levels are to bemeasured with an octave analyzer per ANSI S1.11.4.3 CalibrationSound level instrument acoustic calibration shouldbe checked before and after each test per ANSIS1.13.4.4 Meter settingSlowmeterresponseispreferredforsoundpressurelevel measurements per ANSI S1.13.5 Test proce
43、dureFor the purpose of sound pressure measurement inaccordance with this standard the followingconditions shall apply.5.1 EnvironmentThe acoustic environment for sound pressure test-ingshallbethemanufacturerstestlocationwhichistypically semi-reverberant. Since the purpose is todeterminethesoundpress
44、urelevelgeneratedbythegear unit, other equipment should be acousticallyisolated from the gear unit during the test.5.2 MountingThe gear unit should be mounted for testing in itsdesigned normal operating position. The testtransmission system (driver, gear unit and load)shouldpreferablybeconnectedbyme
45、ansofthefinalintended components, if available.5.3 Test conditions of the gear unitFor the purpose of sound measurement tests inaccordance with this standard, the followingconditions will apply:ANSI/AGMA 6025-D98AMERICAN NATIONAL STANDARD3- a gear unit intended for service at fixedconstant speed sha
46、ll be tested at that designspeed unless otherwise agreed upon betweengear manufacturer and purchaser;- the test speeds for a gear unit intended forservice over a range of operating speeds shallspan that range of operating speeds, unlessotherwise agreed upon between themanufacturer and the purchaser;
47、- gear units may be operated with or withoutload at the gear manufacturers discretion unlessspecifictestloads,agreeduponbetweenthegearmanufacturerandthepurchaser,arestatedinthepurchase contract;- thedirectionofrotationduringthetestshallbethe same as that intended in service. If the direc-tion of rot
48、ation is unknown, the test should be inboth directions.In individual cases, especially where unusuallyhighspeeds or powers are involved, alternate operatingconditions may be negotiated.6 Sound measurement6.1 Microphone locationThe microphone shall be located perpendicular toeach of the units major v
49、ertical surfaces, near theapproximate center but not less than 1.0 foot (0.3meter) above the test floor or plate (see figure 1).Themicrophonepositionwhichismosttypicalofthegear units maximum A-weighted sound level shallbe used for acceptance level measurements. Thedistance between the major vertical surface of thegear unit and the microphone, if not otherwisespecified, is to be as listed in table 1. A microphonedistance such as the employee normal workingdistanceshallbespecified,butshallnotbelessthanthree feet (1 meter).Table 1 - Distan
