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For the ships, the propulsion system is almost always the main underwater radiated noise source. Thereby, a particular care must be exercised in the design and manufacturing of any propulsion system. That is all the more true for the podded propulsion systems (PODS) because of very important acoustic risks due to the submerged situation of most of the components (in particular for the electric motor). Different acoustic measurements of existing PODS (commercial PODS) have pointed out important levels due to the electric motor which is directly linked to the housing.
DCN PROPULSION has designed a silent POD (for naval applications) for which the electric motor (with permanent magnets so less noisy) is elastic mounted to the housing. A vibroacoustic simulation has been entrusted to DGA/DCE/CTSN to predict radiated noise according to the motor vibrations levels. The use of two different numerical methods (Finite Element method for low frequencies and SEA (Statistical Energy Analysis) method for high frequencies) allows to cover a large frequency range. The reliability of these design and simulation is ensured by various works (studies and trials) carried out for the stealthiness of submarines designed and built by DCN. This paper presents the main results of these simulations in term of radiated acoustic pressure. |
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