Abstract
The acoustic radiation from line-forced, finite-length, fluid-loaded flat plates with attached stiffeners has been formulated. The stiffeners may be of arbitrary size and location, but were assumed to generate transverse inertial reaction forces only. The solution for the plate response due to harmonic excitation was obtained using an expansion of the in-vacuo plate modes. The resulting acoustic radiation was obtained by numerically evaluating Rayleigh’s integral. Calculated sound pressure levels were obtained in both the far field and the near field above the plate at several frequencies. Individual modal contributions to the radiated sound were also calculated. It was found that the presence of the ribs could produce local reductions in the near-field sound level by as much as 20 dB. Explanations for this behavior were found in the presence of beats between various structural modes.
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