Determination of coupling loss factors for two beams using fem

Coupling loss factors (CLF) are most important for computing sound and vibration using SEA. CLF and internal loss factors (ILF) constitute a matrix of energy balance equations. CLF can be defined analytically, experimentally or using computational modeling. The latter way is most universal but less developed at present. Determination of CLF for two beams at right angle using FEM is presented in this paper. It is shown that CLF which are derived from numerical simulating are differ from analytical values. But numerical CLF in energy balance equations for structure of four beams provide better results than analytical CLF.