Acoustical Radiation from Periodically Stiffened Membrane Excited by Turbulent Boundary Layer.
Interim rept. Feb 73-Aug 74,
MASSACHUSETTS INST OF TECH CAMBRIDGE ACOUSTICS AND VIBRATION LAB
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Characteristics of periodically stiffened membrane are studied by using a string model loaded with equally-spaced mass and rotary inertia. The acoustical radiation by periodically stiffened membrane excited by a turbulent boundary layer is estimated using a modal analysis on an individual bay of membrane between stiffeners. Two theoretical predictions of radiated sound power are made using statistical energy methods. One is based upon measured wall pressure data, the other upon measured vibratory response of the membrane. Both agree well with direct measurements of radiated sound power.