Sound Performance Simulation Of Typical Structure In Ship

The Statistical Energy Analysis (SEA) is used to study the sound performance of typical structure in ship.First, by reading a great number of references, a detailed summary is made in this paper for the history of SEA, complex structure's vibroacoustic prediction and the self noise analysis of the sonar cavity induced by the turbulent boundary layer.Second, the sound emulation software AutoSEA2 which is used to analyze the sound radiation of a ship excited by machinery is introduced. The emphasis and the difficulty are on the calculation of equivalent force and the equivalent transform of T beam. Area mobility is introduced to calculate the equivalent force induced by the machinery. Sound radiation of the ship excited by this equivalent force is then calculated. Calculated results are compared and coincide with test results. The credibility of SEA is proved.Third, a sonar cavity's self-noise computing model is created using SEA method. On the basis of former research, a new circular cylinder model is used to model sonar dome. During the SEA model creating, emphases are put on the calculation of input power from the turbulent boundary layer which is inhomogeneous to the sonar dome and SEA parameters. By virtue of the fluid dynamics software Fluent, the location where the turbulent boundary layer begins to separate and the pressure coefficient can be known. This section can be referred as a further discussion on this problem.