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Coupled eigenmodes extraction of a water-filled tank

Tank1

coupled eigen mode 5,

structural displacement & acoustic pressure field

The coupled eigen modes of a water filled tank are extracted using OOFELIE::VibroAcoustics package. In this case, even if we are not interested in acoustic field inside the cavity, we have to take it into account since it has a strong impact on the behaviour of the global system. In this example, the mesh mapping algorithm was used since the acoustic and structural mesh are incompatible.

In the table 1, the coupled eigen frequencies of the coupled system are extracted and compared to the structural eigen frequencies computed without taking into account the presence of the cavity. We can see that the cavity add some mass effect to the system and have to be added to the model in order to obtain the real behaviour.

Tank 2 - coupled eigen mode 5, structural displacement & acoustic pressure field
Coupled Uncoupled
0 Hz /
30.2 Hz 41.6 Hz
86.6 Hz 126.2 Hz
100.1 Hz 148.7 Hz
115,6 Hz 151 Hz
156.5 Hz 221.4 Hz
175.6 Hz 250 Hz
187.5 Hz 261.8 Hz
244.3 Hz 309.7 Hz
277.8 Hz 354 Hz

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