1、 KSKSKSKS SKSKSKS KSKSKS SKSKS KSKS SKS KS 2004 1 28 KS I ISO 11820 KS I ISO 11820: 2004 I ISO 11820: 2003 ( ) ( ) ( ) : : 2004 1 28 04 0055 : : ( ) ( 02 509 7286) . 7 5 , . ICS 91.120.20 KS I ISO 11820: 2004Measurements on silencers in situ 1996 ISO 11820 Acoustics Measurements on silencers in situ
2、 , . 1. 1.1 . , . ( , , ) KS A ISO 7235 . Dis Dts . ( .) . “s” , “t” , “i” . , . 1.2 a) , , , , , (HVAC) , , , , , b) ( , , , ) c) on/off ( ) d) ( , , , ). . ( ) . 1.3 a) 63 4 kHz , 31.5 8 kHz 50 5 kHz 1/3 , 25 10 kHz 1/3 b) , , I ISO 11820: 2004 2 . 2. . . KS C 1502 KS C 1505 KS A ISO 3744 ISO 5221
3、 Acoustics Air distribution and air diffusion Rules to methods of measuring air flow rate in an air handling duct 3. . 3.1 D tps 12st pppLLD = (1) 1pL : (1/3 KS A 5113 , 20Pa) 2pL : (1/3 ) Dtps (9.13 ). pL . dBNLpjLNjp=1.01101log10 (2) Lpj: j N: 3.2 Dips Dips LpII LpI (3) LpI: (1/3 KS A 5113 ) LpII:
4、 , . Dtps Dips . 1/2 , I ISO 11820: 2004 3 . 3.3 Dts Dts LW2 LW1(4) LW1: , , . 10111dB)/log(10 KSSLLpW+= (5) (5. 9.1 ) S1: Lp1 S1: A 1/4 Sabine , S1 (6 ln 10) V/(cT1) (6) V: c: ( c 340 m/s) T1: S0 1 m2K1: (dB)( A ) 2WL : , . 2022dB)/log(102KSSLLpW+= (7) (5. 9.1 ) S2: 2pL S2: 1/4. Sabine , 2pL , . S0
5、 1 m2K2: (dB)( A ) S1 S2 , K1 K2 . 3 dB . 3.4 Dis , dB . Dis LWII LWI(8) LWI: (1/3 ) . I01II)/log(10 KdBSSLLpW+= (9) I ISO 11820: 2004 4 IpL : (1/3 ) . (5. 9.1 ) SI: IpL SI: A 1/4 . Sabine . SI (6 ln 10)/V(cTI) (10) TII: V c: 3.3 . S0 1 m2KI: (dB)( A ) LWII: (1/3 ) , 1pW , . II0IIIIIIdB)/log(10 KSSL
6、LpW+= (11) IIpL : (1/3 ) . (5. 9.1 ). SII: IIpL SII: A 1/4 . Sabine . SII (6 ln 10)/V(cTII) (12) TII: V c: 3.3 . S0 1 m2KII: (dB)( A ) SI SII , KI KII Dis . A . 3.5 pT Tup , Tdp TdTuTppp = (13) . 2 , I ISO 11820: 2004 5 . . 3.6 p S , pS pT . =2d2u2TS112 SSqppv (14) : (kg/m3) qv: (m3/sec) Su: (m2) Sd
7、: (m2) 4. 4.1 (3.1 ) 1 . 3 dB 1pL . . dB311 10 0 4.2 (3.2 ) 1 . 3 dB , Dips . . Dips LpII LpI LpI: (1/3 ) LpII: I ISO 11820: 2004 6 (1/3 ) KS A ISO 7235 3.12 , . 5. 1 . 16 4 . . . , , K . 1 No. 6 ISO 140 10 . 1 No.8 ISO 140 5 . , . , 1/3 . K , . . I ISO 11820: 2004 7 . . 1 : : : / / I ISO 11820: 200
8、4 8 6. 6.1 KS A ISO 3744 . KS C 1502 KS C 1505 1 . , (8.2.3 ) . . , B , . . . 15 KS A ISO 5136 Friedrich tube 6.2 , , ISO 5221 . . 10 Pa 10 . . 5 . 7. . . ( ) . . , . , , , , , . . . , . , . 8. 8.1 , . . . . I ISO 11820: 2004 9 , . 8.2 8.2.1 . 1 m . . . ( 2 a) ) . . . ( 8 ) . . . . . . . . ( 30 m/s)
9、 120 dB, 20Pa . 1. . 2 . 2. 2 . . 1 dB . 3. . 4. . I ISO 11820: 2004 10 a) b) c) . 2 8.2.2 , , . 3: 1 , . 3 . , 0.5 m . 1 m . , . , 0.5 m . 1 m . , 2 (b) (c) . . . . . 8.2.3 4 . a) b) c) d) . . B . 4 m . 1 dB . I ISO 11820: 2004 11 . . 1 m . , 2 (b) (c) . . . . . Sf . . 8.3 , , 8.3.1 (main airstream) , , . du . uu45.1Sd = (15) Su: dd . fdd1012 SSd = (16) Sd: Sf: . 8.3.2 pa . . pT pS . , 15 mm . 2 1 . 2 . 8.3.3 ( ) . ( ) . . 8.3.4 ( .). , . I ISO 11820: 2004 12 9. 9.1