Estudo do acoplamento acústico-estrutural de uma estrutura do tipo casca cilíndrica uniforme

Abstract

In the last years it has been increasing the researchers' interest, contemplated by the great number of publications, dedicated to the active control of noise, in structures as aeronautics and vehicular. In that sense the study of the interaction between structures and acoustic fields is of fundamental importance in the understanding and the application of the technique of active control. This work presents a study of the coupling between structures and acoustic fields, applied in a structure of uniform cylindrical shell type. The ANSYS is used to obtaining the natural frequencies and the acoustic and structural modes. It is shown that the structural and acoustic modes act in different frequencies, that the number of modes of structural vibration is larger than the number of acoustic modes and that the natural frequencies of a structure don't increase with the increase of the modal indexes.