Noise, Vibration and Harshness (NVH) is a critical consideration in the design of automotive and aerospace vehicles for comfort, and fatigue of components arising from interior structural and acoustic pressure fluctuations due to external structural or acoustic loading. In the low to mid frequency range, the starting point for computational NVH investigation is the displacement/pressure based unsymmetric, coupled Eulerian Finite Element/Finite Element formulation. One of the major bottlenecks in such computational NVH investigation(s) is that the finite element model obtained along this way is of a very high dimension and therefore, the solution for the coupled dynamic response of a single design becomes computationally expensive - even with modern hardware. In this work, we show that the approach based on model reduction via the Arnoldi processes allows us significantly to speed up harmonic simulation necessary for low frequency, interior acoustic, fully coupled NVH problems. We demonstrate this effect for a strongly coupled NVH benchmark. The computational results indicate that the required coupled states (displacements and pressures) from a direct harmonic simulation could be obtained for time comparable with that for just a few frequencies. Finally, we demonstrate how the approach based on moment matching leads to efficient fully coupled structural-acoustic optimization.
Efficient simulation for strongly coupled Noise-Vibration-Harshness (NVH)
2008
13 Seiten, 12 Bilder, 1 Tabelle, 6 Quellen
Conference paper
English
Efficient Simulation for Strongly Coupled Noise-Vibration-Harshness (NVH)
British Library Conference Proceedings | 2008
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