Making Sense of Large FEA NVH Databases using SEA Concepts

The paper presents an energetic post-processing methodology for large-scale vibro-acoustic finite element models. Starting from a dynamic and an acoustic modal basis produced by a finite element analysis (FEA), the methodology produces:

1. 1
   synthetic and pertinent energetic outputs;
2. 2
   optimal SEA partitions of the finite element mesh;
3. 3
   quality indicators of existing SEA partitions.

The methodology involves six different steps, some required, some optional:

1. 1
   automatic partitioning of the FEA model in patches;
2. 2
   calculation of distribution matrices;
3. 3
   definition of mechanical loads;
4. 4
   definition of damping characteristics;
5. 5
   modal-based vibro-acoustic response calculation;
6. 6
   energetic post-processing;
7. 7
   automatic partitioning in SEA subsystems;
8. 8
   verification of existing SEA partitions.

Each step will be presented in turn. The methodology will be illustrated by application of the successive steps to a Renault Laguna body and an Alstom two-storey TGV train section.