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???????????????
????-??????????
1. ?????????
GB/T9396-1996 ?????????????
GB/T9397-1996 ????????????????
GB9400-88 ?????????????
GB7313-87 ?????????????????????
GB12058-89 ?????????2. ?????????
???? Znom
????? Qts
???? Vas
???? Fo
?????? Psin
?????? Pnom
?????? Pmax
?????? Fo-Fh
????? SPL
3. ????????????
3.1 ?????
?????????????????????????????????GB9400-88?????????????
3.2 ??
??????????????????????????????????????????????????????????????????????????????????????
3.3 ??
?????????????????????????
????????
32*18*6,35*18*6,40*19*8,45*22*8,50*22*8,55*25*8,60*25*8,60*32*8,
65*32*10,70*32*10,80*40*15,90*40*15,100*45*18,100*60*20,110*60*20120*60*20,130*60*20,140*62*20,145*75*20,156*80*20,180*95*20,
220*110*20
?????
SJ/T10410-93 ?????????
3.4 ??
??????????????????(??????)????????????????????????????
?????????
13.3 14.3 14.7 15.4 16.3 18.4 19.4 20.4 25.5 25.9 30.5 35.5 38.6 44.5 49.5 50.5 65.5 75.5 80.0 100.0 127.0
3.5 ?????????
?????????????????????????????????????????????????????????????????????
3.5.1 ?????
???????????????2 mm (?????????????)????????????? 1 mm????????????????? 3 mm ????????????? 2 mm ????????????????? 0.5 mm ???
3.5.2 ?????
??????????????? 2 mm ????????????????? 0.5 mm ?????????????????????????? 0.5 mm ???
3.5.3 ?????
????????????????????????????????????????????
3.5.4 ?????
????????????????? 0.2~0.9 mm ?????????????
3.5.5 ?????
???????????????? 0.1~0.4 mm ?????????????
3.5.6 ???T?
??????????T????? 0.3~0.6 mm ???????????
3.5.7 ?????
??????(????????)???????????(?????) 0.3~0.6 mm ?????????????????????????????????????????
3.5.8 ?????
?????????????????????? 0.5~2 mm ??????????? 2~5 mm ???????????????????????????????????????
4. ?????????????
4.1 ??
4.1.1 ??????????
???????????????
??????????????
????:????????????????????????????,???????????T/S???????????.
????????:??
??????????
??? ??????
1.1 ?????
1.2 ????????
1.3 ??,?????
1.4 ???????
??? ??????
2.1 ???????
2.2 ???????
2.3 ??
2.4 ????,?????
2.5 ???????
2.6 ????
2.7 ????
??? ??????????
3.1 ??????
3.2 ???????
3.3 ????????
3.4 ????????
3.5 ???
3.6 ????
3.7 ????
3.8 ????
??? ??????????
4.1 ????,??(??,??,???,??,??,???,???,??,?
?,?,???)
4.2 Thiele?Small?????????
4.3 ?????????????
4.4 ????
4.5 ????
4.6 BL??,????
4.7 ????Q???
4.8 ???? Vas ???---P67
4.9 ?????????
4.10 ????????T/S????
4.11 ??PC????????,??,clio, Sound check,Klippel, LMS.
??? ??,????????
5.1 ?????
5.2 ??????????
5.3????????
5.4 ??????
5.5 ??????????
5.6?????????
??? ???????
1.1?????
1.1.1???????
???????????????????????????????????????????????????????
?????y = A sin ?
A????? ?m?
???? (???)?
?x-y ??????x?????y????????????????????????????????????2?=360???/2 = 90?????x??????y?????????????????????????????
y = A sin(?t)
? ???? ? = 2?/T
T ????????????????
? t = T, ?t = 2?; ? t = T/2, ?t = ?, ? t = T/4, ?t = ?/2 ?? ?t??????T ????1/T = f, ??????????(1?)??????
??? x??????y?????????????????????????????
y = A sin(?x)
? ???? ? = 2?/?
? ????????????????x ??????
?????? y = A sin(?t) ?????????t = 0 ????? 0??????????????? y = A sin(?t + ?)?? ???????????????????T, ??????f , ????????? f=1/T,
???? C =?/T =?f
? = C / f
?? 1Hz ?? ???344m
10Hz ?????34.4m
100 Hz ?? ???3.44m
1000Hz ?? ???0.344m
1.1.2 ?????
(???????)
??:???????????
??:???????????
???????
????????,??????,????,??????????,?????,??????????????????????????: P =P0 sin(?t + ? )
P0??????????????????
1.2 ????????
1.2.1 ??Sound Pressure
?????????????????(??)?????
P = P0 sin(?t + ? )
P0????? ???????Pa (N / m2)
??????1.0325*105 Pa? 1000 hPa?
????????,??????RMS??Root-Mean-Square?????. ??????
??????,??????RMS??Root-Mean-Square?????. ??
????
?????? P0?? ? Prms = 0.707 P0, ? ?2/2 P0
? Prms = 0.707 P0, ? ?2/2 P0
??????????????,????????.?????????????20 ?Pa (????1000Hz?)
???????????20 ?Pa (????1000Hz?)
????????????2*10-2 Pa
??????????2*10-2 Pa
???????????2Pa
?????????2Pa
> 20Pa?,?????
????20?Pa???????????(1000 Hz),500 Hz?,???,?????1000 Hz?,??????,???????3.5K Hz
1.2.2 ??f
????????????,???Hz,
??????????20Hz - 20kHz
< 20Hz???
> 20000Hz???
1.2.3 ??
?????????????????????????????? ??: ?? > ?? > ??
????,??c = 331.6 + 0.6t (m/s), ??t??????
??15??,c?340 m/s??.
???????????????????????????0.1Pa, ???????? p/(?
1.2.4 ??
????????,???????????????
C, f, ?????:
C=?*f
??????????(????????),??,????????,???????.
1000Hz?? 0.34 m
100Hz?? 3.4 m
10Hz?? 34m
1Hz??340 m
????????????????.???????,?????????,??????,???????.??????????,????,??????????????.??????,?????.?????? > > ??,???????,?????????.
0 C0 ) ?2.5*10-4 m/s . ????30 C0?415 N.S/m,
???????????????
??????????????
????:????????????????????????????,???????????T/S???????????.
????????:??
??????????
??? ??????
1.1 ?????
1.2 ????????
1.3 ??,?????
1.4 ???????
??? ??????
2.1 ???????
2.2 ???????
2.3 ??
2.4 ????,?????
2.5 ???????
2.6 ????
2.7 ????
??? ??????????
3.1 ??????
3.2 ???????
3.3 ????????
3.4 ????????
3.5 ???
3.6 ????
3.7 ????
3.8 ????
??? ??????????
4.1 ????,??(??,??,???,??,??,???,???,??,?
?,?,???)
4.2 Thiele?Small?????????
4.3 ?????????????
4.4 ????
4.5 ????
4.6 BL??,????
4.7 ????Q???
4.8 ???? Vas ???
4.9 ?????????
4.10 ????????T/S????
4.11 ??PC????????,??,clio, Sound check,Klippel, LMS.
??? ??,????????
5.1 ?????
5.2 ??????????
5.3????????
5.4 ??????
5.5 ??????????
5.6?????????
??? ???????
1.1?????
1.1.1???????
???????????????????????????????????????????????????????
?????y = A sin ?
A????? ?m?
???? (???)?
?x-y ??????x?????y????????????????????????????????????2?=360???/2 = 90?????x??????y?????????????????????????????
y = A sin(?t)
? ???? ? = 2?/T
T ????????????????
? t = T, ?t = 2?; ? t = T/2, ?t = ?, ? t = T/4, ?t = ?/2 ?? ?t??????T ????1/T = f, ??????????(1?)?????? ??? x??????y?????????????????????????????
y = A sin(?x)
? ???? ? = 2?/?
? ????????????????x ??????
?????? y = A sin(?t) ?????????t = 0 ????? 0??????????????? y = A sin(?t + ?)?? ???????????????????T, ??????f , ????????? f=1/T,
???? C =?/T =?f
? = C / f
?? 1Hz ?? ???344m
10Hz ?????34.4m
100 Hz ?? ???3.44m
1000Hz ?? ???0.344m
1.1.2 ?????
(???????)
??:???????????
??:???????????
???????
????????,??????,????,??????????,?????,??????????????????????????: P =P0 sin(?t + ? )
P0??????????????????
1.2 ????????
1.2.1 ??Sound Pressure
?????????????????(??)?????
P = P0 sin(?t + ? )
P0????? ???????Pa (N / m2)
??????1.0325*105 Pa? 1000 hPa?
????????,??????RMS??Root-Mean-Square?????. ??????
??????,??????RMS??Root-Mean-Square?????. ??
????
?????? P0?? ? Prms = 0.707 P0, ? ?2/2 P0
? Prms = 0.707 P0, ? ?2/2 P0
??????????????,????????.?????????????20 ?Pa (????1000Hz?)
???????????20 ?Pa (????1000Hz?)
????????????2*10-2 Pa
??????????2*10-2 Pa
???????????2Pa
?????????2Pa
> 20Pa?,?????
????20?Pa???????????(1000 Hz),500 Hz?,???,?????1000 Hz?,??????,???????3.5K Hz
1.2.2 ??f
????????????,???Hz,
??????????20Hz - 20kHz
< 20Hz???
> 20000Hz???
1.2.3 ??
?????????????????????????????? ??: ?? > ?? > ??
????,??c = 331.6 + 0.6t (m/s), ??t??????
??15??,c?340 m/s??.
???????????????????????????0.1Pa, ???????? p/(?
1.2.4 ??
????????,???????????????
C, f, ?????:
C=?*f
0 C0 ) ?2.5*10-4 m/s . ????30 C0?415 N.S/m,
?????????????????
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发表于 2019-9-13 23:46:11