Evaluation of SEA Loss Factors Using Structural Intensity Measurement

This paper presents an estimation method for loss factors in Statistical Energy Analysis (SEA). SEA technique is applied to estimate the structure borne sound transmission in the middle and high frequency range, and the accuracy of SEA depends on the evaluation of factors required in SEA. Some evaluation methods for the factors have been proposed, but they require the complex analysis or the large amount of time for measurement and much knowbows. In this presented method, the power flow among subsystems in SEA is directly measured by the structural illtensity measurement, it needs no knowhows and a small scale of measurement. It is applied to make SEA models of some structures numerically and experimentally. As a result, it is confirmed that this proposed method gives the factors with high presicion for analysis.