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The Application of Advanced Panel Methods to Propeller/Hull Interaction
ANALYTICAL METHODS INC REDMOND WA
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Propeller-hull interaction arises in two related but distinct ways. Unsteady forces and moments developed by the propeller operating in the spatially nonuniform hull wake and transmitted to the hull through the propeller shafting are known as bearing forces. Periodic pressure forces induced on the hull due to the hydrodynamic action of unsteady propeller velocity and pressure field are termed surface forces. The increase of shaft output power and restrictive profile of current single-screw designs give rise to vibration and noise problems. In the past, propeller-induced ship hull vibration has been handled primarily as in-service engineering modifications. Recently, however, many articles have appeared on the topic of ship vibration and noise arising from pressure excitation 1, 2. A fund of theoretical knowledge on the various hydrodynamic aspects of the interaction problem has emerged from the collective works of groups of investigators such as Breslin et al. 3, Cox et al. 4, Kaplan 5, Noordzij 6, Huse 7 and others. In spite of these advances in the understanding of the flow, there is no satisfactory answer to the question of whether some particular wake, together with a given propeller configuration, will cause vibration problems at a given speed.
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