Speaker
Description
In recent years, simulation methods for two-way coupled acousticfluid–structure interaction (AFSI) have significantly advanced and areincreasingly applied to complex automotive configurations. Theseapproaches enable a detailed analysis of coupling mechanisms betweenflow, acoustics, and structural response, and allow identification ofdominant excitation pathways and their implications for modellingstrategies.In this contribution, three representative automotive applications areinvestigated: the vibration of an aluminium underbody panel in an SAEreference body, the vibration of a side window in a near-productionside-mirror/side-window configuration, and the vibration of a bonnetin a series-representative vehicle configuration. For all cases, goodagreement between simulation and experimental measurements isachieved, providing a reliable basis for further analysis.Across the investigated cases, both hydromechanical and acousticpressure fluctuations contribute to structural excitation; however,their relative importance varies significantly depending on theconfiguration. The role of two-way coupling is analysed for each case,highlighting when feedback effects between structure and fluid areessential for accurate prediction.Furthermore, it is shown that, within a two-way coupled simulationframework, particular attention must be paid to the structural modalmodel. In particular, experimentally validated modal models mayalready include ambient-air effects, which can lead to double-countingwhen used in fully coupled simulations—especially in the presence ofenclosed air volumes. The implications for modelling strategies inautomotive vibro-aeroacoustics are discussed.