Structural power-flow analysis using a mobility approach of an L-shaped plate

Abstract

In the analysis of the vibration response and structure-borne vibration transmission between elements of a complex structure, statistical-energy analysis (SEA) or finite-element analysis (FEA) are generally used. However, an alternative method is to use vibrational power-flow techniques that can be especially useful in the midfrequencies between the optimum frequency regimes for FEA and SEA. Mobility power-flow analysis has, in general, been used for one-dimensional beamlike coupled structures or for point-coupled structures. In this paper, the power-flow technique is extended to two-dimensional platelike coupled structures joined along a common edge. Because of the inherent advantages in using this power-flow approach, frequency or spatial averaging is not required, and thus the resonant modal response of the coupled structure is determined. The mobility power-flow results are compared to results obtained using FEA and SEA. The agreement with FEA results is good at low frequencies. However, the power-flow technique has an improved computational efficiency as the frequency increases. Compared to the SEA results, the power-flow results show a closer representation of the actual modal response of the coupled structure.