Study on Sandwich steel Application in Automotive BIW for NVH Improvements

In Worldwide Automotive market the migration of customers towards cars having fuel efficient ,compact designs is well established & accepted as an engineering challenge by global automotive OEM.OEMs globally continuously trying to meet customer expectations in vehicle performance criterion. Despite moving towards compact, fuel efficient designs, customers are unwilling to lose many of the vehicle attributes. In which NVH performance is major contributing factor which decides the vehicle performance from customer point of view. Hence, the designer has to ensure that the advantages of a significant weight saving is achieved with proper vibro-acoustics performance. This Paper considers some of the research part of using multilayer damping material in automotive BIW for controlling structure born noise. The study deals with the design, design considerations for sandwich Panels. Design CAE validation, and physical testing along with design optimization of a composite sandwich panel. NVH performance is evaluated using a dedicated experimental setup for the vibro-acoustic characterization of sandwich panels. The predicted improvements in NVH behavior of vehicle are considered for further implementation in BIW design.