SENSITIVITY OF THE PREDICTIVE STRUCTURAL MODELS UNDER STOCHASTIC AND CONVECTIVE EXCITATION

The quality of the predictive response of a structural domain, under a random and convective load, is here analyzed by discussing each step of the numerical procedure. The structural response, due to a wall pressure distribution, is derived in modal coordinates according to a finite element scheme. The modal basis can include the dry or wet (aeroelastic) structural mode shapes: in the present analysis only the in vacuum eigenvectors are used. For such a problem one of the most critical points is the transformation of the pressure distribution into discrete locations. In fact, this step depends on (i) the assumed TBL model, (ii) the integration scheme and (iii) the frequency range. These three points are the goals of the present work where the specific sensitivity to each of them is investigated. The transformation of the pressure distribution into discrete locations can be computationally expensive for the desired level of the required numerical approximation. The use of consistent formulation in the finite element scheme can be unfeasible. Moreover the approximations, in expressing the pressure field, can have a different influence on the structural responses according to the chosen TBL models. This is another key aspect of the present work.