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Noise from ships in ports Possibilities for noise reduction

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Figure

Table 2 The guiding limits for low frequency noise and infra-sound, in dB re.20µPa,
Figure 2 Measured A-weighted sound pressure level, dB(A) re. 20 µPa, narrow-band  frequency spectrum 0 – 100 Hz, at approximately 5 meters distance from a Wärtsilä  W6L32 3000kW / 720 rpm engine exhaust stack outlet
Figure 3 Measured A-weighted sound pressure level, dB(A) re. 20 µPa, in 1/3-octave  bands, at approximately 5 meters distance from a Wärtsilä W6L32 3000kW / 720 rpm  engine exhaust stack outlet
Figure 4 The relation between Dead Weight Tonnage and Sound Power Level  established in [12]
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