PREDICTION OF FLOW-INDUCED STRUCTURAL VIBRATION AND SOUND RADIATION USING ENERGY FLOW ANALYSIS

✍ Scribed by F. Han; R.J. Bernhard; L.G. Mongeau

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 320 KB
• Volume: 227
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1998.3013

✦ Synopsis

The energy ¯ow analysis method was used to predict the structural vibration response and the radiated sound power of a plate excited by wall pressure ¯uctuations under turbulent boundary layers, and separated±reattached ¯ows. This method allows the spatially averaged energy density response to be calculated for non-uniform, distributed excitations while taking hydrodynamic ¯ow/structural coupling eects into consideration. The power input was calculated using well known analytical models for the plate mechanical impedance and empirical models for the surface pressure cross-power spectral density and/or wave number±frequency spectral density. The Smol'yakov± Tkachenko model was used to estimate the ¯uctuating pressure ®eld underneath turbulent boundary layer ¯ows. The Corcos model was used to estimate the wall pressure ®eld under non-uniform, separated±reattached ¯ows. Experiments were performed in order to evaluate the energy ¯ow model. A clamped plate installed in a quiet, low-speed wind tunnel was used. The wall pressure ¯uctuations, the plate vibration response, and the acoustic pressure radiated from the plate were measured. The energy ¯ow analysis method was found to provide reasonably accurate predictions of the frequency-averaged transverse velocity response of the plate at high frequencies. The acoustic pressure radiated on the quiescent side of the plate was also predicted with comparable accuracy.