|
I=PV | (1) |
I=PP/PV=P2/400 | (2) |
|
(3) |
SPL=10lgP2/400+120=20lgP/( 2×10-5)(dB) | (4) |
I | P | SPL | I | P | SPL |
---|---|---|---|---|---|
10-12 | 2×10-5 | 0 | 10-5 | 6.33×10-2 | 70 |
10-11 | 6.33×10-5 | 10 | 10-4 | 2×10-1 | 80 |
10-10 | 2×10-4 | 20 | 10-3 | 6.33×10-1 | 90 |
10-9 | 6.33×10-2 | 30 | 10-2 | 2 | 100 |
10-8 | 2×10-3 | 40 | 10-1 | 6.33 | 110 |
10-7 | 6.33×10-3 | 50 | 1 | 20 | 120 |
10-6 | 2×10-2 | 60 |
|
(5) |
I=10(SPLa/10-12) | (6) |
SSPLab=SPLa+10lg(1+10t/10) | (7) |
t | D | t | D |
---|---|---|---|
0 | 3 | 11 | 11.3 |
1 | 3.5 | 12 | 12.3 |
2 | 4.1 | 13 | 13.2 |
3 | 4.8 | 14 | 14.2 |
4 | 5.5 | 15 | 15.1 |
5 | 6.2 | 16 | 16.1 |
6 | 7 | 17 | 17.1 |
7 | 7.8 | 18 | 18.1 |
8 | 8.6 | 19 | 19.1 |
9 | 9.5 | 20 | 20 |
10 | 10.4 |
测点位置 | 噪声(dB) | |
---|---|---|
反转速 1000 转/分 |
正转速 800 转/分 | |
1 | 83.2 | 80 |
4 | 70 | 70 |
6 | 60 | 60 |
7 | 58 | 58 |
9 | 70 | 70 |
12 | 67 | 67 |
2 | 83.2 | 83 |
4 | 63 | 65 |
8 | 54 | 60 |
10 | 57 | 58 |
11 | 67 | 65 |
3 | 65 | 67 |