A hybrid approach to predict the vibration transmission in ship structures using a waveguide method and statistical energy analysis

Abstract

Prediction of vibration transmission in ship structures is important, to design maritime vessels with greater power and reduced weight, without increasing noise levels. As the frequency increases, and hence the number of modes increases, it is more practical to consider average responses and their distribution over the structure, using a technique such as Statistical Energy Analysis (SEA). Numerical results from an exact, analytical waveguide model are compared with those of conventional SEA models. These results include both response predictions and the SEA parameters. The theoretical estimation of the SEA parameters, namely the coupling loss factors, form the basis for the hybrid approach between the waveguide method and SEA technique. Results are presented for plate structures in an L, T and X-shaped configuration, and a complex built-up structure.