Table 4 Sound pressure levels for outfield noise at characteristic frequencies.

From: Noise spectrum characteristics of marine pump units induced by different excitation sources

Excitation sources

Frequency/Hz

BPF (295)

2BPF (590)

3BPF (885)

Lp

Fluid excitation/dB

51.3

26.6

38.0

139.2

Surface dipole/dB

41.0

22.1

36.0

136.3

Rotating dipole/dB

51.6

26.3

23.1

137.3

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