MIL-J-21708G (NOTICE 1)
作者:标准资料网 时间:2024-05-24 22:15:37 浏览:9256
来源:标准资料网
MIL-J-21708G (NOTICE 1), MILITARY SPECIFICATION: JACKET, COLD WEATHER (01 JUL 1987)., MIL-J-21708G, dated 1 July 1987, is hereby canceled without replacement.
【英文标准名称】:Acoustics-Determinationofsoundpowerlevelsandsoundenergylevelsofnoisesourcesusingsoundpressure-Engineeringmethodsforanessentiallyfreefieldoverareflectingplane
【原文标准名称】:声学.使用声音压力测定噪音源声功率级与声能级.采用反射面上的自由声波场的工程测量法
【标准号】:ISO3744-2010
【标准状态】:现行
【国别】:国际
【发布日期】:2010-10-01
【实施或试行日期】:2010-10-01
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC43
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:Absorption;Acousticmeasurement;Acoustictesting;Acoustics;Calibration;Definitions;Determination;Earprotectors;Envelopingsurfacemethods;Environment;Ergonomics;Externalnoise;Fixings;Installations;Mathematicalcalculations;Measurement;Measurementduration;Measuringinstruments;Measuringsurfaces;Measuringtechniques;Methods;Methodsofcalculation;Microphones;Noise;Noise(environmental);Noisemeasurements;Noisesources;Operation;Precision;Reflective;Rooms;Sound;Soundabsorption;Soundfields;Soundlevel;Soundlevels;Soundpower;Soundpressure;Soundsources;Specification(approval);Standarddeviation;Testequipment;Testing;Testingconditions
【摘要】:ThisInternationalStandardspecifiesmethodsfordeterminingthesoundpowerlevelorsoundenergylevelofanoisesourcefromsoundpressurelevelsmeasuredonasurfaceenvelopingthenoisesource(machineryorequipment)inanenvironmentthatapproximatestoanacousticfreefieldnearoneormorereflectingplanes.Thesoundpowerlevel(or,inthecaseofnoiseburstsortransientnoiseemission,thesoundenergylevel)producedbythenoisesource,infrequencybandsorwithA-weightingapplied,iscalculatedusingthosemeasurements.NOTEDifferentlyshapedmeasurementsurfacescanyielddifferingestimatesofthesoundpowerlevelofagivennoisesourceandanappropriatelydraftednoisetestcode(seeISO12001)givesdetailedinformationontheselectionofthesurface.
【中国标准分类号】:Z32
【国际标准分类号】:17_140_01
【页数】:86P.;A4
【正文语种】:英语
【英文标准名称】:StandardSpecificationforDesignationoftheBalancePointLocationforArcheryArrows
【原文标准名称】:弓箭平衡点定位的名称与符号标准规范
【标准号】:ASTMF1435-2004
【标准状态】:现行
【国别】:
【发布日期】:2004
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:F08.16
【标准类型】:(Specification)
【标准水平】:()
【中文主题词】:体育器材;射箭术;插件;重心;箭头
【英文主题词】:ATAarrowlength;balancepoint;frontofcenter;insert;nockslot
【摘要】:1.1Thisspecificationcoversthemethodofdetermininganddesignatingthelocationofthebalancepointofanarrowassemblyforusewithanarcherybow.1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.
【中国标准分类号】:Y56
【国际标准分类号】:
【页数】:2P.;A4
【正文语种】:
