PROPULSION MACHINERY SYSTEM NOISE PREDICTION MODEL

OVER THE LAST 15 YEARS DETAILED METHODS HAVE BEEN DEVELOPED TO PREDICT THE TORSIONAL AND LATERAL VIBRATION OF PROPULSION GEAR TRAINS USING LUMPED PARAMETER, DISTRIBUTED MASS-ELASTIC PARAMETER AND STATISTICAL ENERGY ANALYSIS TECHNIQUES. BY IMPROVING THE DETAIL USED FOR THE PROPELLER, SHAFTING AND SOUND ISOLATION COUPLINGS ON THE OUTPUT AND TURBINE ROTOR, SHAFTING AND COUPLING MODELLING, ON THE INPUT OF THE CURRENT MODELS, THEY CAN READILY BE EXPANDED TO PROVIDE BOTH THE SOLICITED TORIONAL MODEL AND ALSO A CASING VIBRATION PREDICTION MODEL, VALID OVER A WIDE FREQUENCY RANGE. THIS MODEL WILL BE DOCUMENTED AND EXPLAIN THE ANALYTICAL MODELS USED TO REPRESENT THE PHYSICAL COMPONENTS OF THE SYSTEM IN TERMS FAMILIAR TO NAVAL ENGINEERS.