Evaluation of procedure-induced conflicts in the prediction of structural intensity in vibroacoustics

The structural intensity vector describes the propagation and transmission of structure-borne sound energy inside of a vibrating structure. For arbitrarily curved structures, the part of the structural intensity depending on the extensional waves has been shown to be a potentially useful indicator. Although the prediction of the structural intensity in numerical simulations is well known, the prediction of the structural intensity based on measured data is still challenging. In recent years, two novel approaches have been developed to predict the structural intensity in arbitrarily curved structure based on measured vibration data. First, a finite element based approach is considered. Second, a mesh-free approach is proposed which uses polynomial regression. Both approaches are promising for solving the challenging measurement task but have not yet been compared. Consequently, this paper deals on the evaluation of the procedure-induced conflicts. For this purpose, data of one specific source is used to predict the structural intensity using the finite element based approach and the mesh-free local polynomial approach. The full vector field of the structural intensity which includes the part of the extensional as well as the part of the flexural waves is predicted. Finally, the procedure-induced conflicts of the two approaches are examined.