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The mid and high frequency structural responses of launch vehicle structures during lift-off are dominated by the acoustic excitation over the exterior of the launch vehicle. This intense acoustic excitation in broad band frequencies is generated by the turbulent mixing of exhaust gases from the rocket engines with the ambient atmosphere. Therefore, the prediction of structural response due to acoustic excitation is important for the scientific community. The response of the crew module due to diffuse acoustic excitation during pad abort condition is studied and presented in this paper. Vibro-acoustic models were developed in VA One software using the structural dynamic model of crew escape system coupled with the crew module. Both Finite Element (FE) and Statistical Energy Analysis (SEA) models were developed for random response analysis. FE model is used for prediction in the 20 Hz to 500 Hz band and SEA model in the 500 Hz to 2000 Hz band. The vibration response at various locations on the crew module has been predicted. The effect of crew module fairing modes, varying acoustic excitation, damping spectrum etc. on the vibration response on crew module are discussed in this paper.
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