Page 129 - 《应用声学》2022年第5期

第 41 卷 第 5 期 钟丽琴等： 水下流激孔腔噪声前馈有源控制实验研究 805

-50 -50
ANC-OFF -60 ANC-OFF
Ҫဋ៨ࠛए/(dBSHz -1 ) -70 Ҫဋ៨ࠛए/(dBSHz -1 ) -70
ANC-ON(Theory1)
ANC-ON(rf-P3)
-60
ANC-ON(Theory2)
ANC-ON(rf-P2)
-80
-80
-90
-90
-100 -100
10 1 10 2 10 1 10 2
ᮠဋ/Hz ᮠဋ/Hz
(a) ԠᏦηՂѬѿ˞P3֗P2ᄊေ᝷ᬌ٪ (b) P1ܫࠄᰎᬌ٪
-40 ANC-OFF -40 ANC-OFF
Ҫဋ៨ࠛए/(dBSHz -1 ) -60 ANC-ON(rf-P2) Ҫဋ៨ࠛए/(dBSHz -1 ) -100 ANC-ON(rf-P2)
ANC-ON(rf-P3)
ANC-ON(rf-P3)
-60
-80

-80

-100 -120
-140
10 1 10 2 10 1 10 2
ᮠဋ/Hz ᮠဋ/Hz
(c) P2ܫࠄᰎᬌ٪ (d) P3ܫࠄᰎᬌ٪
图 4 工况 S1 下参考信号分别在 P2 和 P3 时的理论和实验降噪情况
Fig. 4 Theoretical and experimental noise attenuation when the reference signal is at P2 and P3 under
working condition S1

-50 -40 ANC-OFF
Ҫဋ៨ࠛए/(dBSHz -1 ) -70 Ҫဋ៨ࠛए/(dBSHz -1 ) -60 ANC-ON(rf-P2)
ANC-ON(rf-P3)
-60

-80
ANC-OFF
-90
ANC-ON(Theory1) -80
ANC-ON(Theory2)
-100 -100
10 1 10 2 10 1 10 2
ᮠဋ/Hz ᮠဋ/Hz
(a) ԠᏦηՂѬѿښP2֗P3ᄊေ᝷ᬌ٪ (b) P1ܫࠄᰎᬌ٪
-40 ANC-OFF -40 ANC-OFF
Ҫဋ៨ࠛए/(dBSHz -1 ) -60 ANC-ON(rf-P2) Ҫဋ៨ࠛए/(dBSHz -1 ) -60 ANC-ON(rf-P2)
ANC-ON(rf-P3)
ANC-ON(rf-P3)

-80
-80

-100 -100
-120
10 1 10 2 10 1 10 2
ᮠဋ/Hz ᮠဋ/Hz
(c) P2ܫࠄᰎᬌ٪ (d) P3ܫࠄᰎᬌ٪
图 5 工况 S2 下参考信号分别在 P2 和 P3 时的理论和实验降噪情况
Fig. 5 Theoretical and experimental noise attenuation when the reference signal is at P2 and P3 under
working condition S2