GOST 30457 3-2006 Acoustics Determination of sound power levels of noise sources using sound intensity Part 3 Precision method for measurement by scanning《声学 利用声音强度测定噪声源功率级 第3部分 扫描.pdf

1、 3 (ISO 9614-3:2002, MOD) , ()INTERSTATE COUNCIL FOR STANDARDIZATION, METROLOGY AND CERTIFICATION(ISC)30457.32006( 9614-3:2002)92006/229, - 1.092 . - 1.297 . -, . , , 1 - - ( ) - , 42 3 , (- 30 7 2006 .) : ( 3166) 00497 ( 3166) 00497 AMKZKGMDRUTJUA - - 4 9614-3:2002 . - . 3. (ISO 9614-3:2002Acoustic

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4、f noise sources using sound intensity.Part 3. Precision method for measurement by scanning1 1.1 , , , () , . - , . - . , - . - 1/3- . , , , ( ).- . , . , - , . . - , . , - .1.2 , - , , (. 5.2.2, 5.3 5.4). , , , .1 30457.32006( 9614-3:2002) 200710012 : 1716882 . ( 61260:1995 . - ,NEQ) 1718781 . ( 616

5、72-1:2002 . . 1. ,NEQ) - , 1 , , . (), (-) . , , , , .3 :3.1 Lp,(sound pressure level): . 20 .3.2 c114I (t), /2(instantaneous sound intensity): , . , -c114I (t)=p(t)c114u(t), (1) p(t) , ;c114u(t) , /;t , .3.3 c114I ,/2(sound intensity): - .1 c114I = lim ( )TTTtdtc174c165c24210c114I , (2) T , ;2 :I c

6、114I .,- , ;|I | c114I .3.4 In,/2(normal sound intensity): - , - c114n. In=c114c114In, (3)c114n , , - .3.5 LIn,(normal sound intensitylevel): |In|.2 30457.320061 LIn= 10lg|IIn0c230c232c231c231c246c248c247c247, (4) I0 (I0=1012/2).2In, (-) , , c100pI0(. 3.10).3.6 3.6.1 Pi(partial sound power): - i.1 P

7、i= IniSi, (5) Ini , - i , ;Si i- .2 Ini LIn, i- Ini= I01010LIn/.(6)3 LIn, , i- - , Ini Ini=I01010LIn/.(7)3.6.2 P,(sound power): , - . P = PiiNc229,(8) N .3.6.3 LW, (sound power level): , , .1 LW= 10lg|PP0,(9) P0 (= 1012).2P , (-) .3.6.4 LW0,(normalized sound powerlevel): (c810= 23 , B0= 101325 ).1 LW0= LW 15lgB1013252961527315c215c43c233c235c234c249c251c250, c81, (10) c81 , ;B , .2 . .3 30457.320063.7 3.7.1 (measurement surface): , , , . , , - , .3.7.2 (partial surface): , , - (. 1).3.7.3 (segment): , - (. 2). .3.8 (extraneous intensity): ,