Retrofit-induced changes in the radiated noise and monopole source levels of container ships

Open Access Peer Reviewed Research Article 2023

Plos ONE

ZoBell, V.M., Gassmann, M., Kindberg, L.B., Wiggins, S.M., Hildebrand, J.A and Frasier, K.E.
Analysis of radiated nose and monopole source levels of large container ship after retrofit. The container shipping line Maersk underwent a radical retrofit to increase capacity by ~2000 twenty-foot equivalent units which increased the draft by ~1.5m. This resulted in higher radiated noise levels (~2dB) in mid-high frequency bands. accounting for Lloyd’s mirror effect, the monopole source levels were significantly lower (~5dB) in low frequency bands, especially at low speeds. This is thought to be due to the reduction in cavitation due to propeller and bow design .
Keywords: Acoustics, Engines, Noise reduction, Oceans, Reflection, Sea water, Ships, Sound pressure

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