Methodology for determining the damping loss factor of damped aeronautical structures
TRL7
A preencher
Joinville
Innovative Concepts and Scenarios ICS
One of the main sources of cabin noise in an aircraft comes from the turbulent boundary layer that excites the fuselage. From the vibration of the fuselage, vibroacoustic energy is transmitted to the interior of the aircraft via air and structural means. An efficient way to reduce the energy that reaches the interior of the cabin is to increase the damping of the fuselage, causing a large part of the energy to be dissipated at the beginning of the propagation path. Viscoelastic materials are usually used to maximize fuselage damping. This solution is also applied, in some cases, to the interior panels of executive aircraft, where cabin comfort requirements are tighter. The correct characterization and modeling of viscoelastic materials, applied to the structure, is of fundamental importance for the correct selection and application of these materials, maximizing their performance and reducing the weight necessary to obtain the expected results. Previous efforts to characterize these structures resulted in routines that were computationally expensive and inefficient in situations where materials with non-typical characteristics were used. This project aims to develop a reliable methodology, with low computational cost and viable application for various types of damping solutions, for the characterization of viscoelastic materials and the application of these properties in determining the damping loss factor of structures. aeronautical areas where these materials are applied
Request Contact