This paper presents an optimization approach for tailoring the dynamic response of a complete exhaust system using finite element modeling. Before the optimization procedure is started, the FE-model is updated using modal test data. This preliminary step is required to ensure the validity of the initial FE-model. The actual optimization routine consists of two iteration loops: an inner and an outer loop. The inner iteration loop performs the optimization using a modal domain modification technique to predict the change of the dynamic response of the structure. In this way the structure can be optimized in a computational efficient way. However, the modal domain prediction is only accurate within a limited parameter range. Therefore, the outer iteration loop reevaluates the full finite element model once the parameter changes exceed the trust-region bounds of the modal domain prediction. The solution of the re-evaluation is then used as improved base for the modal domain prediction in the inner iteration loop. The suggested optimization approach is illustrated on a finite element model of an exhaust system of a passenger car. The exhaust system is connected to the car body using four isolators. The optimization is performed to keep the force transmitted by the exhaust system through the isolators to the car body below the design specifications, optimizing the stiffness of the decoupling elements. The goal is to ensure a good NVH (Noise Vibration Harshness) performance of the exhaust system.
Optimization of the dynamic response of a complete exhaust system
2009
8 Seiten, 5 Bilder, 4 Tabellen, 5 Quellen
Aufsatz (Konferenz)
Englisch
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