TURBULENCE-INDUCED PANEL VIBRATION
Abstract
Motivated by the problem of boundary-layer induced panel noise, a detailed study has been made of the transverse vibration of 11 x 11 inch steel panels flush-mounted in the wall of a turbulent flow duct. Panel thicknesses were .002 and .008 inch. Duct cross sections were 1 x 12 and 8 x 12 inches, and flow speeds were about 60 to 200 feet per second. The characteristics of the exciting pressure field at the wall and of the resultant vibration of the sample panels were investigated using statistical techniques. Relief charts of the experimental two-point space-time correlation of panel vibration versus longitudinal separation and time-delay showed pronounced oblique ridges and valleys discernable in a more random pattern. These are interpreted as running waves (with a speed equal to that of the pressure field convection) with an irregular pattern superposed. Such running waves were predicted by Ribner's idealized infinite-panel model of the flexural response. On the other hand, a superposition of stationary unsteady oscillations in the various modes of a finite panel forms the basis of the more realistic but more complex theories. To test the compatibility, Dyer's idealized theoretical model of the panel response was developed and programmed for a digital computer. (AKUTHOR)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1964
- Accession Number
- AD0448045
Entities
People
- M. Y. Elbaroudi
Organizations
- University of Toronto