1、 ISO 11820:1996Acoustics Measurements on silencers in situ(MOD) , ()INTERSTATE COUNCIL FOR STANDARDIZATION, METROLOGY AND CERTIFICATION(ISC)313242006( 11820:1996)12006/443, - 1.092 . - 1.297 . , . , , -, 1 - - , - 42 3 , (- 29 24 2006 .). : ( 3166) 00497 ( 3166) 00497 AZBYKZKGMDRUTJUA - 4 11820:1996
2、 . (ISO 11820:1996Acoustics Measurements on silencers in situ, MOD). , - , . 11820:1996 5 28 2006 . 272- 313242006 ( 11820:1996) 1 2007 .6 ( ) - . , . , 2007 -, II 3132420061 12 23 24 54.1 54.2 55 .56 66.1 .66.2 , 77 .78 78.1 .78.2 .88.3 , 109 109.1 109.2 1310 1410.1 .1410.2 .1410.3 1410.4 1410.5 .1
3、511 .15 () 16 () - 17 18III 313242006 - 11820:1996. 1 , - . ( ) 3 ( 1.1) 8.1 ( 1.3). 5221, 61672-1 . 3744, 6.1, - 17187. 9.2 . 11820. , .IV 313242006 Noise. Determination of performances of silencers in situ tests 200704011 1.1 - . , - . , , - 1 - ( , , ). :- Dis;- Dts. - .1.2 :) , , , (, -), - (, ,
4、 , , , , - , , , .);b) (, , - ); - , - .c) c ( -), -, ;d) (, , , ). . , (, ), , ( ).1 313242006( 11820:1996) 2 : 1716882 1/3-. - ( 61260:1995 . , NEQ) 1718781 . ( 61672-1:2002 . . 1. , NEQ) - , 1 , , . (), (-) . , , , , .3 :3.1 Dtps,(transmission soundpressure level difference): -.1 Dtps 9.1.3.2 Dtp
5、s Dtps= LLpp21c45 , (1) Lp1 (1/3-) - ( ) - , ;Lp 2 (1/3-) - ( ), . Lp, , LNpLjNpjc61c230c232c231c231c246c248c247c247c61c22910110011lg ,(2) Lpj j- , ;N .3.2 , Dips,(insertion sound pressure leveldifference): , , .1 Dips Dtps , - . - , , .2 Dips Dips= LpII LpI, (3) LpI (1/3-) , - -, ;LpII (1/3-) , , .
6、2 3132420063.3 Dts,(transmission loss): .Dts Dts= LW2LW1, (4) LW1 (1/3-) , - , , .LW1 LW1= Lp1+ 10lg (S1/S0)+K1, (5) (. 5 9.1):S1 , Lp1, A -, . S1 S1= (6 In10)V/(cT1), (6) V , 3;c , / ( = 340 /);T1 , ;S0=12;K1 (. ), ;LW2 (1/3-) , .LW2 LW2= Lp 2+ 10lg(S2/S0)+K2, (7) (. 5 9.1):S2 , - Lp 2, - , Lp2 , -
7、 , 2;S0=12;K2 , - (. ). S1 S2 , - K1 K2 c177 3 .3.4 Dis,(insertion loss): - . Dis Dis= LWII LWI, (8) LWI (1/3-) , , LWI= LpI+ 10lg(SI/S0)+KI, (9) LpI , (1/3-) , . (. 5 9.1);SI , 2, LpI A - , . SI SI= (6 ln10)V/(cTI), (10) TI , , V c 3.3 (6);S0=12;3 313242006KI (. ), ;LWII ( 1 ) 1/3- , .LWII LWII= LpII+ 10lg(SII/S0)+KII, (11) LpII ( 20 ) 1/3- - , , , ;SII (c. 5 9.1) , LpII, - ,
