Improvement of body panel FE models through vibration and 3D-shape image measuring methods

摘要

In this paper, we propose a strategy for improving structural finite elements (FE) models using vibration and 3D-shape optical measuring methods in order to enhance the prediction of body interior noise at low frequencies. First, we present a 3D-shape validation technique based on triangulation and structured light projection. After the digitization of the actual shape, the geometric data can be compared with the CAD model and give rise to a modification of the geometry of the FE mesh if necessary. Then, we present a method dedicated to vibration mode shape measurement by combining accelerometric and Pulsed Laser ESPI (Electronic Speckle Pattern Interferometry) measurements. The main advantage of this method is to provide a whole field information allowing to increase the spatial resolution and ensuring more accuracy of the validation data. The capability of these techniques is finally illustrated through an application conducted on a tailgate window.