Building a suited reduced modal basis for updating 3D acoustic models with the constitutive law error method

✍ Scribed by V. Decouvreur; A. Deraemaeker; P. Ladevèze; Ph. Bouillard

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 508 KB
• Volume: 196
• Category: Article
• ISSN: 0045-7825
• DOI: 10.1016/j.cma.2007.03.006

✦ Synopsis

We have recently reported the possibility of developing an updating technique for acoustic finite element models based on the constitutive law error proposed by P. Ladeve `ze and co-workers in structural dynamics. Like with every updating technique, we are confronted with and interested in reducing the computational time. The main idea of this paper consists in building a reduced modal basis made of two contributions: static modes complete a truncated modal basis corresponding to the frequency range of computation. The static modes are associated to the system excitation (for instance a normal velocity boundary condition), but also to the system damping and to the reference measurements.

Updating acoustic models using the reduced modal basis shows a significant CPU-time saving with respect to the full non reduced system with an acceptable accuracy.