Study of the vibro-acoustic behaviour of composite sandwich structures by means of a novel test setup

摘要

In this paper an experimental-numerical approach is presented to tackle the vibro-acoustic characterizationof composite sandwich structures. A novel experimental setup allows for fast and comprehensiveunderstanding of the NVH behaviour of composite sandwich panels. This information can then be furtherexploited in numerical model updating and design tools for optimized solutions. Experimental modalanalysis and acoustic insertion loss tests are carried out in order to verify the structural and acousticnumerical models of a given sandwich panel. The symmetric motion coincidence frequency is used toretrieve the compression modulus of the core foam material. Later on a second design, derived from thefirst, is considered. The predicted improvements in NVH behaviour are experimentally verified with goodaccuracy. The vibro-acoustic test rig is shown to be a valuable support for the design of compositestructures when NVH performance is a key indicator attribute.