【英文标准名称】:Acoustics-Determinationofsoundpowerlevelsofnoisesourcesusingsoundpressure-Engineeringmethodsforsmall,movablesourcesinreverberantfields-Part2:Methodsforspecialreverberationtestrooms(ISO3743-2:1994);EnglishversionofDINEN
【原文标准名称】:声学.声压法测定噪声源声功率级.混响声场中小型可移动声源的工程检测法.第2部分:专用混响试验室法(ISO3743-2:1994),ENISO3的德文版本
【标准号】:DINENISO3743-2-2009
【标准状态】:现行
【国别】:德国
【发布日期】:2009-11
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Absorption;Acousticmeasurement;Acoustictesting;Acoustictestingrooms;Acoustics;Closedtestrooms;Definitions;Determination;Directmethod;Environment;Externalnoise;Handling;Information;Insulations;Mathematicalcalculations;Measurement;Measuringincertainity;Measuringinstruments;Measuringtechniques;Methods;Microphones;Noise(environmental);Noisemeasurements;Noisesources;Portable;Powerlevels;Precision;Pressuremeasurement(fluids);Reverberationrooms;Reverberationtime;Sound;Soundabsorption;Soundlevel;Soundpressure;Soundradiation;Soundsources;Soundspectra;Springs(water);Testing
【摘要】:1.1GeneralThispartofISO3743specifiesarelativelysimpleen-gineeringmethodfordeterminingthesoundpowerlevelsofsmall,movablenoisesources.Themeasurementsarecarriedoutwhenthesourceisin-stalledinaspeciallydesignedroomhavingaspecifiedreverberationtimeoverthefrequencyrangeofinterest.TheA-weightedsoundpowerlevelofthesourceundertestisdeterminedfromasingleA-weightedsoundpressurelevelmeasurementateachmicrophoneposition,ratherthanfromasummationofoctave-bandlevels.Thisdirectmethodeliminatestheneedforareferencesoundsource,butrequirestheuseofaspecialreverberationtestroom.Thedi-rectmethodisbasedonthepremisethatthesoundpressurelevel,averagedinspaceandtimeinthetestroom,canbeusedtodeterminethesoundpowerlevelemittedbythesource.Thepropertiesofthespecialreverberationtestroomarechosensothattheroom'sinfluenceonthesoundpoweroutputoftheequipmentundertestissmall.Thenumberofmicro-phonepositionsandsourcelocationsrequiredinthetestroomarespecified.GuidelinesforthedesignofspecialreverberationroomsaregiveninannexB.inadditiontothedirectmethod,acomparisonmethodisalsodescribed(see8.3).However,sincetherequirementsonthetestroomforthecomparisonmethodofISO3743-1areconsiderablylessrestric-tive,itisrecommendedthatthecomparisonmethodofISO3743-1beusedifaspecialreverberationtestroomisnotavailable.NOTE1PrecisionmethodsforthedeterminationofthesoundpowerlevelsofsmallnoisesourcesarespecifiedinISO3741andISO3745.1.2TypesofnoiseThemethodsspecifiedinthispartofISO3743aresuitableformeasurementsofalltypesofnoisewithinaspecifiedfrequencyrange,exceptimpulsivenoiseconsistingofisolatedburstsofsoundenergy.NOTES2AclassificationofdifferenttypesofnoiseisgiveninISO12001.3Forsourcesofimpulsivenoiseconsistingofshort-durationnoisebursts,thefree-fieldmethodsspecifiedinISO3744andISO3745shouldbeused.
【中国标准分类号】:Z32
【国际标准分类号】:17_140_01
【页数】:32P.;A4
【正文语种】:英语


Product Code:SAE AMS2770
Title:Heat Treatment of Wrought Aluminum Alloy Parts
Issuing Committee:Ams D Nonferrous Alloys Committee
Scope:This specification specifies the engineering requirements for heat treatment, by part fabricators (users) or their vendors or subcontractors. It also covers heat treatment by warehouses or distributors converting raw material from one temper to another temper. It covers the following aluminum alloys: 1100, 2004, 2014, 2017, 2024, 2048, 2117, 2124, 2219, 3003, 5052, 6013, 6061, 6063, 6066, 6951,7049, 7050, 7075, 7149, 7178, 7475.This specification may be used for heat treatment of parts made from other alloys provided that temperature, temperature uniformity tolerances, times, and quenchants are specified or approved by the cognizant engineering organization.