通常环境噪音水平.doc

《通常环境噪音水平.doc》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、相关噪音参考资料：所谓噪声;就是指那些人们主观上不需要或者不愿接受的声音。大量的调查表明，对于住宅室内噪声水平：白天对人的起居生活产生心理和生理影响的最低噪声级为40dB(A)，噪声达到60dB时，距离2m的交谈对话绝大多数人都感到吃力；夜间对睡眠产生影响的最低噪声级为30dB(A)，噪声达到50dB时，感到难以入睡的人数超过一半；对于住宅围护结构隔绝空气噪声的性能：理想的隔声量值应大于50dB，隔声量低至40dB时，能听到隔壁的大声讲话。对于楼板隔绝撞击噪声的性能：计权撞击声级低于65dB时，除敲打、蹦跳外，一般声音听不到，人们大体上认为还可以，计权撞击声级在75-85dB之间时，能听到

2、脚步声，拖桌椅、孩子跑跳感觉强烈，敲打声则更是难以忍受。CommonNoiseLevelsNOISELEVELSINOURENVIRONMENTFACTSHEETHowLoudisTooLoud?Expertsagreethatcontinuedexposuretonoiseabove85dBAovertime,willcausehearingloss.Toknowifasoundisloudenoughtodamageyourears,itisimportanttoknowboththeloudnesslevel(measuredindecibels,dBA)andthelengthof

3、exposuretothesound.Ingeneral,thelouderthenoise,thelesstimerequiredbeforehearinglosswilloccur.AccordingtotheNationalInstituteforOccupationalSafetyandHealth(1998),themaximumexposuretimeat85dBAis8hours.At110dBA,themaximumexposuretimeisoneminuteand29seconds.Ifyoumustbeexposedtonoise,itisrecommendedtha

4、tyoulimittheexposuretimeand/orwearhearingprotection.MeasureUpandTurnitDown:DecibelLevelsAroundUsThefollowingaredecibellevelsofcommonnoisesourcesaroundus.Thesearetypicallevels,however,actualnoiselevelsmayvarydependingontheparticularitem.Remembernoiselevelsabove85dBAwillharmhearingovertime.Noiseleve

5、lsabove140dBAcancausedamagetohearingafterjustoneexposure.NoiseLevelsofAverageSounds AreaDevicedBA  SoundsofQuietGrandCanyonatNight(noroads,birds,wind)10SoundsofQuietBreathing11SoundsofQuietQuietBasementw/oMechanicalEquipment20SoundsofQuietQuietRoom28-33SoundsofQuietTypicalLivingRoom40  Communicati

6、onWhisper30CommunicationNormalConversation55-65CommunicationNormalConversation60CommunicationShoutedConversation90CommunicationBabyCrying110  Home/OfficeComputer37-45Home/OfficeRefrigerator40-43Home/OfficeQuietOffice/Library40Home/OfficeForcedHotAirHeatingSystem42-52Home/OfficeRadioPlayinginBackgr

7、ound45-50Home/OfficeBackgroundMusic50Home/OfficeLargeOffice50Home/OfficeElectricToothbrush50-60Home/OfficeWashingMachine50-75Home/OfficeAirConditioner50-75Home/OfficeElectricShaver50-80Home/OfficeBathroomExhaustF