Boundary Layer Pressure Fluctuations and Structural Response

The free vibrations and random response to jet noise of an integrally stiffened five bay panel have been studied both theoretically and experimentally. A finite element approach was used to represent the panel for both parts of the study, and the predictions were verified by measurements on a model panel integrally machined from solid Aluminum stock. The comparison between predicted and measured vibration modes and frequencies revealed good correlation of frequencies while the correlation of mode shapes was only fair, especially for higher modes. The predicted modes and frequencies were used in a modal analysis of the panel's response to jet noise with a consistent finite element method being introduced to calculate the required cross spectral modal force terms. Quantitative agreement between predicted and measured rms stresses and displacements was realized, whereas only qualitative agreement was obtained for the associated spectra. Nomenclature ai,bi,ci = finite-element dimensions, Fig. 9 c 0 = speed of sound ei,{E] = polynomial coefficients, Eq. (9) = jth mode shape {F(£,-n)} = column vector of polynomial terms, Eq. (7) Hjfa) = complex admittance for jth mode IjkM = modal force cross spectral matrix, Eq. (4) rrij = generalized mass for jth mode Po = root mean square pressure { PO}, { PI }, {Pz} = consistent finite-element load vectors [Q(co)] = cross spectral matrix for generalized coordinates, Eq. (17) R(x,y,r) = noise correlation function, Eq. (2) w = panel and finite-element displacement Wrms = root mean square displacement {W} = column vector of generalized displacements for finite element, Eq. (8) fy = damping ratio for jth mode Downloaded by UNIVERSITY OF CALIFORNIA -DAVIS on February 3, 2015 | http://arc.aiaa.org |

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Boundary Layer Pressure Fluctuations and Structural Response

Cited by 8 publications

References 2 publications

Hypersonic Fluid–Structure Interactions Due to Intermittent Turbulent Spots on a Slender Cone

Hypersonic Fluid–Structure Interactions Due to Intermittent Turbulent Spots on a Slender Cone

Response of Jointed Structures in Shock-Induced Flow: Surface Pressure and Structural Measurements with Finite Element Modeling

Jet Noise Excitation of an Integrally Stiffened Panel

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