A technique for the evaluation of strength of coupling between SEA subsystems
Abstract
One of the main requirements for the successful use of traditional Statistical Energy Analysis (SEA) is to have weakly coupled subsystems. In particular, the method of energy matrix inversion to determine loss factors can be subject to serious error if subsystems are strongly coupled. Unfortunately, there is neither a single definition of weak coupling nor a practical measure of the strength of coupling; but, recently, a very general definition of weak coupling, stemming from an exact derivation of the SEA fundamental equations, has been proposed by R.S. Langley. On the basis of this definition and the study of onedimensional and twodimensional coupled subsystems, a convenient way to measure the strength of coupling is described. It appears that, in the case of resonant coupling, when one subsystem is subject to impulsive excitation, the time delay in the rise of the kinetic energy in the indirectly excited subsystem can be used to define a good indicator of the strength of coupling for one and twodimensional systems.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 December 1994
 Bibcode:
 1994STIN...9524997J
 Keywords:

 Coupling;
 Dynamic Structural Analysis;
 Energy Methods;
 Kinetic Energy;
 Statistical Analysis;
 Structural Vibration;
 Time Lag;
 Beams (Supports);
 Coupled Modes;
 Excitation;
 Matrices (Mathematics);
 Plates (Structural Members);
 Rods;
 Springs (Elastic);
 Structural Mechanics