SEA PARAMETER ESTIMATION BASED ON A MODAL APPROACH

摘要

This paper concerns the higher frequency vibrations of complex built-up structures, in particular, the problems involved in predicting the Statistical Energy Analysis (SEA) coupling loss factors by the conventional SEA theory. A modal approach is used to quantify the coupling strength between two coupled subsystems through an arbitrary interface. In the weak coupling region, the analytical expressions for describing the inter-modal coupling relations between the two sets of subsystem modes can be greatly simplified. Combining with the conventional SEA procedure, the SEA coupling loss factors and other SEA parameters can then be predicted in a simpler but more systematic way. A rod-rod coupling example is presented to illustrate the validity of the approach.