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UDCHJHJT902004NormonAcousticalDesignandMeasurementofNoiseBarriers200407122004100111213143513620A()Lr22B()fe26C()2736ABC20041011111122GBJ00596GBJ4783GBJ7584GB309693GB378583GBT39471996GBT1462393GBT1517394GBT171811999HJT2.495331(Lp)soundpressurelevel1020(dB))(lg20opppL=dB(1)pPap020Pa32A(LpA,LA)A-weightedsound[pressure]levelA233A(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()3()39(NRC)noisereductioncoefficient25050010002000Hz05)(4120001000500250αααα+++=NRC(3)310(TL)soundtransmissionloss10)/lg(10tiEETL=4EiEt311(Rw)weightedsoundreductionindex1003150Hz1/31003150Hz1/3436m512dB41(1.a)4411Ld(1.b)1412TLTLTLLt••ABdSRaSRº•(c)φRS(b)5TLLd10dBLt0413(1.c)LrNRC42421Ld4211(3),52tanh2lg20dBNN+ππN0=∆dL,5dBN=0,2tan2lg205dBNNππ+0N-0.250dB,N0.2N)(2dBAN−+±=λmdmAmBm6N()=NcosLd2242121340,)1()1(4)1(3lg102≤=+−−cfttttgarctδπ1340,)1ln(2)1(3lg1022=−+−cfttttδπ(6)fHz=A+B-dmcm/s4213Ld(6)3Ld/3(a)8.5dB=∆dL792%6.6dBab3422LtLt)1010(1010/10/TLLdtdlgLL−∆−++∆=∆(7)423LrNRCA424LS8LS4.2.14.2.24.2.3425LG44251LG1.5m67.5m(2502000Hz)13(2002500Hz)AALG()13ALG425244DEFNEDDD·=(8)DNmDFmDE=55mLG2.5dBA,DE=150mLG5dBA543210153060120240DE/m∆LGdBA9maxGsrtdLlLLLIL),(∆∆−∆−∆−∆=(9)maxLSLGLG(9)(LS,LG)max43431A432(634000Hz)13(505000Hz)(B)44441441144124413()HJT2.495B104414()()()442443444Ld4441()(5)(6)∆Ldi2|4442()(10)Lbi∆Ldi11LarrlgLooi,)(102+Lbi=(10)rrlgLooi),(10+11Loiroir=∑=∆−niLLadibiL110/)('10lg10(11)4443LdabdLLL−=∆'(12)=∑=niLbbiL110/10lg104444AAiALd−=∆∑∑=+∆−=+niALLniALdidibiibiL110/)(110/)('1010lg10lg10(13)4445Afefe=500Hz(5)(6)ALd4446A544474.2.1.34454451TL-Ld10dBLt0TL2030dB4452TLLd10dB4.2.2(7)Lt125A44644614462Lr4463NRC0.544644.4.6.2ALr44654474471447220dB∆LddBA25201510500.0150.030.060.150.30.61.53.06.015.0δ/m1366448(9)449ILNRC4546551511(TL)AA•14635000Hz1/3804000Hz512(NRC)2502000Hz513(Rw)1003150Hz1/3RwR52521521152125225221GB37851GB/T171811151/3522210%12%5235231(1)(2)30m()()()5232(1)2m/s5m/s(2)10C16(3)(4)523310dB39dB13dB1dB34569321524524152425243()1752552515252D15m1.5m(7)D15m10(8)5.2.65.2.6.1(1)7(D15m)NN1.5mD188(D15m)(2)(3)3(4)(2)2dB101030302min10min20min30min,10dB,,1030dB,,30dB5.2.6.2(1)A)()(,,,,brarbrefarefLLLLIL−−−=16Lref.adBALref.bdBALr.adBALr.bdBA(2)AD10º19(16))()(,,,,brarbrefarefLLLLIL−−−=17Lref.bAdBALr.bAdBALref.aAdBALr.aAdBA5.2.75.2.7.1(1)(2)5.2.7.25.2.7.3(1)(2)(3)5.2.7.4(1)(2)5.2.7.5NRC5.2.7.6A1/35.2.8(1)(2)(3)A13(4)5.2.45.35.3.1GBJ4783GBJ47835.3.21012m2205.3.32502000Hz132002500Hz5.3.41)2)3)4)5)6)5.45.4.1GBJ75845.4.210m25.4.31003150Hz135.4.41)2)3)4)66.1.6.25.3(1)(2)()6.3()6.3.15.2ALeqA(16)TL216.3.2(),5.2.5.2,6.3.3()16.3.46.46.4.16.4.26.4.36.4.46.4.422A)∆LrLrA.11.A.2H=5mW=35mRDB=34m2.A.2S2.4mRRHNHN=9m3.A.2Si()HFHF=35m4.HRHHHRHNHRHN5.(13)52.4mHRHR=0Ld5HR=0Ld=12.5dBA,HR=1.5mLd=11.5dBA6.Lr6.1DBWA.1DBW(1)6.2LdHR=0Ld(12.5dBA)6.1A(2)6.3NRCNRC=0.05(3)6.4AANRCBB(4)6.56.9HR=1.5m6.6HR(1.5m)NRC(0.05)(5)C(6)6.7CBLr(7)6.8Lr(4.5dBA)HR(1.5m)6.9(HR=7.5m)H(5m)HR(A.1)NRCC6.10CBLr236.11Lr(6.5dBA)H6.12HR(1.5m)Ld(11.5dBA)Lr(4.5dBA)NR=Ld-Lr=7.0dBAHR=7.5m(=7.0dBA)NR=7.0-6.5=0.5dBA6.13NRC=0.8HR=1.5mLr=0.5dBAHR=7.5mLr=1.0dBA6.14HNHRHFNRCNRC/dBA0.053.00.102.50.301.50.601.00.800.51.000.024A.11.0NRC=0.05NRC=0.05NRC=0.3NRC=0.3NRC=0.6NRC=0.6NRC=0.8NRC=0.8NRC=1.0NRC=1.0NRC=0.05NRC=0.3NRC=0.6NRC=0.8NRC=1.00.0525A2HS=2.4m•HRHN=9mHF=35mH=5mDB=34mW=35mW/2HS=2.4mSRSI26B()feLdA1.0.0110m2.13ALANiALAN3.(6)|Ldi(2)4.ALAiALA5.Ld6.LdL|di∑=′∆−∆=∆71),()(71jjdjdfLLfδδ(B.1)fej=0.01,0.1,0.5,1,2.5,5,107f=315Hz,400Hz,500Hz,630Hz,800Hz,1000Hz,1250Hz27C()1GB/T3947-19962FHWARD7658NoiseBarrierDesignHandbook,1976.3.ImplementationPackage76-8,HighwayNoiseBarrierSelectionDesignandConstructionExperienciences,1976.4.VerkehrslrmLrmschutzwndeETV:LSW88,ZusmmenstellungeneinigerfrLrmschutzwndewichtigerNormenundBestimmungen,1988.5.ISO9613-2:1996,Acoustics-Methodofcalculationontheattenuationofsoundduringpropagationoutdoors.6.ISO10847:1997,Acoustics-In-situdeterminationofinsertionlossofoutdoornoisebarriersofalltypes.