Franken Vibroacoustic Method for Cylindrical Shells

The front end of a typical rocket vehicle contains avionics and a payload, enclosed by a cylindrical skin. Rocket vehicles are subjected to intense acoustic loading during liftoff. The external acoustic pressure causes the skin surfaces to vibrate. The skin sections are also excited by structural-borne vibration transmitted directly from the engine or motor. Nevertheless, the acoustic field is usually the dominant excitation source.

The references present an empirical method for calculating the vibration response of a cylindrical skin to an external acoustic pressure field. This method is based on data collected by Franken from studies of Jupiter and Titan 1 acoustic and radial skin vibration data collected during static firings.

The external acoustic pressure field may be due either to liftoff or to aerodynamic buffeting thereafter.

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References:

Vibration Response of a Cylindrical Skin to Acoustic Pressure via the Franken Method: Franken.pdf

Peter Franken, Methods of Space Vehicle Noise Prediction, WADC Technical Report 58-343, Volume II: Franken_acoustics.pdf

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The scripts for performing this calculation are given at:
Vibrationdata Signal Analysis Package

>> vibrationdata > Acoustics & Vibroacoustics > Vibroacoustics

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– Tom Irvine

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