Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
499658 | Computer Methods in Applied Mechanics and Engineering | 2007 | 9 Pages |
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. Ladevèze 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.