On the estimation of DLF of highly damped structures
* Presenting author
The damping loss factor (DLF) of a structure represents numerically its power dissipation capacity under a given excitation field, and it is an important input parameter for numerical models based on Statistical Energy Analysis (SEA). Different experimental approaches are described in the literature to obtain the DLF from complex structures. Nevertheless, the application of such methods to estimate the DLF of highly damped structures, for example fuselage panels with viscoelastic materials, may be questionable, With its focus on the DLF computation for highly damped structures, this paper intends to present a broad overview through a numerical-experimental approach on three of the main methods presented in literature: the Power Input Method (PIM), the Periodic Structures Theory and a more recent approach known as Inhomogeneous Wave Correlation (IWC). Numerical and experimental results are discussed, presenting the nuances for each of the implementations, as well as their main advantages and limitations under the given context.