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Underwater Radiated Noise (URN) emanating from surface and underwater marine platforms has become a significant concern for all the Nations in view of the global requirement to minimise the increasing adverse impact on marine mammals and fishes and maintain ecological balance in the ‘Silent’ ocean environment. Ambient noise level in the sea in 10 to 300 Hz frequency band has increased by 20 to 30 dB due to shipping (Wittekind, 2009). Noise from marine platforms is a persistent and pervasive pollutant and furthermore, due to its spatial and temporal variability, it represents a particular challenge for marine conservation, management and planning (McWhinnie et al., 2017). Marine propeller (in non-cavitating and cavitating regime) is a potential contributor to the ships noise and a lot of scientific research has been undertaken and considerable progress has been achieved in estimating the hydro-acoustic performance of marine propellers. Non-cavitating propeller noise is of significant importance in case of merchant ships operating at speeds less than cavitation inception speed and deeply submerged underwater marine platforms and torpedoes. A considerable amount of understanding and maturity has been attained towards the analysis and estimation of marine propeller cavitation noise and a considerable progress has also been made in the field of non-cavitating noise. In light of this, the scope of this review paper is to critically examine the traditional and advanced methods used for estimating the hydro-acoustic performance of marine propellers, particularly in the non-cavitating regime, over the past many years.
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