最新Noise Monitoring & Your Hearing Conservation Program[噪声监测与听力保护计划](68)教学讲义PPT课件.ppt

《最新Noise Monitoring & Your Hearing Conservation Program[噪声监测与听力保护计划](68)教学讲义PPT课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、NoiseMonitoring&YourHearingConservationProgram[噪声监测与听力保护计划](68)Introduction30CFRPart62isthenewMSHANoiseStandard.Thefollowingpresentationprovidescurrentinformationonthisregulation,andisbasedonmaterialthatwaspresentedtoMichiganmineoperatorsinhands-onnoisesamplingworkshopsin2001.Nospec

2、ificclaimsaremadeconcerningtheaccuracyoftheinformationpresentedhere.PrintedMaterialsNeededforthisPresentation.PrintedMaterialsTherearehardcopyforms,tablesandexamplesthatgowiththispresentation.Makesuretheyareavailable.PleasenotethattheMSHANoisestandarddoesnotdictatetheformatofforms.T

3、heformspresentedherearesuitableforrecordingpurposes,butyoumaydesignyourown.ThePrintedMaterialswe'veprovidedhavebeennumberedintheorderthattheyarepresented.Formnumbersareintheupperright-handcorneroftheform.Someformsconsistofmorethanonepage.NoiseBasicsThetwofactorsthatdeterminehowhazar

4、dousnoiseisare:Intensity(Loudness)measuredindBATimeofExposuremeasuredinHoursandMinutesThelouderthenoise,themorehazardousitis.Also,thelongertheexposuretime,themorehazardousthenoiseis.A“NoiseDose”combinesbothloudnessandtimeandisaconvenientwayofdescribingtherelativehazardofthenoise.Noi

5、seBasicsLoudnessismeasuredusingalogarithmicscale.Thismeansthata10decibelincreasedoesnotsimplyadd10tothepreviouslevel.Itmultipliesthepreviouslevelby10.ThresholdofHearing0dBAQuietRoom45dBAConversation55dBA=45dBAx10Car(50mphat50ft)65dBA=45dBAx100EndLoader(InGoodCab)75dBA=45dBAx1,000Hau

6、lTruck(InGoodCab)85dBA=45dBAx10,000Crusher95dBA=45dBAx100,000OldDozer(NoCab)105dBA=45dBAx1,000,000AirTrackDrill(NoControls)115dBA=45dBAx10,000,000115dBAhas10milliontimesmoresoundenergythan45dBAandiscapableofcausing10milliontimesmoredamagetohearing.NoiseBasicsAllowableNoiseexposureis

7、basedonNoiseDose.NoiseDoseisexpressedasapercentageoftheallowablelimit.Howhighitgoesdependsonbothnoiseintensityandtimeofexposuretonoise.Louder(MoredBA)=MoreNoiseDoseLonger(MoreTime)=MoreNoiseDoseAbsoluteQuiet=0%NoiseDose.85dBAfor8Hrs=50%NoiseDose.90dBAfor8hrs=100%NoiseDose.95dBAfor8H

8、rs=200%NoiseDose.95