Keywords: vibroacoustic, finite element method, statistical energy analysis, hybrid method, mid frequency, transmission loss, sound transmission.

Today errors that are committed in predicting the internal noise level in a structure causes high costs to any industry. Being able to predict noise levels during the early design stages is of great value. As a result of its importance, different techniques have been used in this field, such as the finite element method, statistical energy analysis and hybrid methods. Significant differences exist between computation techniques regarding time consumption, need of detail, etc. making one method or another more appropriate depending on the specific frequency range of interest. In order to determine the accuracy of the methodologies for the whole system, different theories are applied at the same system. The results are compared with experimental values, making conclusions about differences and setting guidelines best suited for working at each situation.

Moreover, due to the potentials of statistical energy analysis for predicting mid-high frequency vibroacoustic system behaviour, a methodology to simplify complex systems is developed allowing them to be modelled statistically. The methodology is applied at a test floor piece from a railway vehicle and the results are compared with values obtained experimentally.

purchase the full-text of this paper (price £22)

go to the previous paper
go to the next paper
return to the table of contents
return to the book description
purchase this book (price £85 +P&P)