声屏障声学设计和测量规范

UDCHJHJT902004NormonAcousticalDesignandMeasurementofNoiseBarriers11213143513620A()Lr22B()fe26C()2736ABC2004101111122GBJ00596GBJ4783GBJ7584GB309693GB378583GBT39471996GBT1462393GBT1517394GBT171811999HJT2.495331(Lp)soundpressurelevel1020(dB))(lg20opppL=dB(1)pPap020Pa32A(LpA,LA)A-weightedsound[pressure]levelA133A(LAeq,TLeq)equivalentA-weightedcontinuoussoundpressurelevelAA(dB)]1[lg10202,∫=TOATAeqdtppTLdB(2)LAeq,TdBT,pA(t)APap020PaAALpA(dB)]101[lg10)10/(,∫•=TOdtLTAeqpATL34[](Lpmax)maximumsound[pressure]level(F)(S)A1335backgroundnoise36noisebarriers()37(IL)insertionlossofnoisebarriersAILPAeq38()soundabsorptioncoefficient()2()39(NRC)noisereductioncoefficient25050010002000Hz05)(4120001000500250αααα+++=NRC(3)310(TL)soundtransmissionloss104)/lg(10tiEETL=EiEt311(Rw)weightedsoundreductionindex1003150Hz1/31003150Hz1/3436m512dB41(1.a)3411Ld(1.b)••SABdRaSRº•(b)SRφ(c)1412TLTLTLLt4TLLd10dBLt0413(1.c)LrNRC42421Ld4211(3),52tanh2lg20dBNN+ππ=∆dLN=0,5dB,2tan2lg205dBNNππ+N50dB,N0.2N)(2dBAN−+±=λmdmAmBm5N()=NcosLd2242121340,)1()1(4)1(3lg102≤=⎥⎥⎥⎥⎥⎦⎤⎢⎢⎢⎢⎢⎣⎡+−−cfttttgarctδπ1340,)1ln(2)1(3lg1022=⎥⎥⎦⎤⎢⎢⎣⎡−+−cfttttδπ(6)=∆dLHz=A+B-dmcm/s4213Ld(6)3Ld/3(a)8.5dB692%6.6dBab3422LtLt(7))1010(1010/10/TLLdtdlgLL−∆−++∆=∆423LrNRCA424LS7LS4.2.14.2.24.2.3425LG601202400153012345dBALG∆DE/m44251LG1.5m67.5m(2502000Hz)13(2002500Hz)AALG()13ALG425244DEFNEDDD·=(8)DNmDFmDE=55mLG2.5dBA,DE=150mLG5dBA8maxGsrtdLlLLLIL),(∆∆−∆−∆−∆=(9)maxLSLGLG(9)(LS,LG)max43431A432(634000Hz)13(505000Hz)(B)44441441144124413()HJT2.495B94414()()()442443444Ld4441()(5)(6)∆Ldi2|4442()(10)Lbi∆Ldi11LarrlgLooi,)(102+Lbi=(10)rrlgLooi),(10+10Loiroir⎥⎦⎤⎢⎣⎡=∑=∆−niLLadibiL110/)('10lg10(11)4443Ld(12)abdLLL−=∆'⎥⎦⎤⎢⎣⎡=∑=niLbbiL110/10lg104444AAiALd⎥⎦⎤⎢⎣⎡−⎥⎦⎤⎢⎣⎡=∆∑∑=+∆−=+niALLniALdidibiibiL110/)(110/)('1010lg10lg10(13)4445Afefe=500Hz(5)(6)ALd4446A544474.2.1.34454451TL-Ld10dBLt0TL2030dB4452TLLd10dB4.2.2(7)Lt115A446446162Lr4463NRC0.544644.4.6.2ALr44654720dB∆LddBA25201510500.0150.030.060.150.30.61.53.06.015.0δ/m44444714472126•6448446AA(9)49ILNRC54551511(TL)13635000Hz1/3804000Hz51512(NRC)2502000Hz3(Rw)1003150Hz1/3RwR52521521152125225221GB37851GB/T17181114(2))()1/3522210%12%5235231(1)30m()(5232(1)2m/s5m/s(2)10C1539dB13dB1dB(3)(4)523310dB3324569152452415243()5242165255252D15m51521.5m(7)D15m10(8)NN1.5mD17D10ºLIL)()(,,,,brarbrefarefLLL−−−=18)()(,,,,brarbrefarefLLLLIL−−−=192021∆2223A.11.0NRC=0.05NRC=0.05NRC=0.3NRC=0.3NRC=0.6NRC=0.6NRC=0.8NRC=0.8NRC=1.0NRC=1.00.05NRC=0.6NRC=0.3NRC=0.05NRC=1.0NRC=0.82425A2HS=2.4m•••SIW/2HS=2.4mSW=35mH=5mDB=34mRHRHN=9mHF=35m∑=′∆−∆=∆71),()(71jjdjdfLLfδδ262728