6. Acoustic measurements in water
Model simulation of noise sources is difficult, especially if cavitation is involved. What's more, free-field simulation using anechoic walls located several wavelengths from the sources is impossible in a hydrodynamic tunnel. Ship noise must therefore be characterized at sea. It is necessary to obtain the noise spectrum, the acoustic pressure or intensity at a known distance, the directivity and to locate the source on the ship.
6.1 Spot measurements
These are measurements taken with one or more hydrophones, whose signals are analyzed independently.
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On-board measurements
The advantage of on-board measurements is that they eliminate uncertainties about the propagation medium, and in particular...
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