Correlation of Analytical and Experimental Hot Structure Vibration Results

Kehoe, Michael W. and Deaton, Vivian C. (1993) Correlation of Analytical and Experimental Hot Structure Vibration Results. Technical Report NASA TM-104269, Research Engineering, NASA Dryden Flight Research Center.

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Abstract

High surface temperatures and temperature gradients can affect the vibratory characteristics and stability of aircraft structures. Aircraft designers are relying more on finite-element model analysis methods to ensure sufficient vehicle structural dynamic stability throughout the desired flight envelope. Analysis codes that predict these thermal effects must be correlated and verified with experimental data. This paper presents experimental modal data for aluminum, titanium, and fiberglass plates heated at uniform, nonuniform, and transient heating conditions. These data are compared with vibration analysis results for the same heating conditions. The data show the effect of heat on each plate's modal characteristics, a comparison of predicted and measured plate vibration frequencies, the measured modal damping, and the effect of modeling material property changes and thermal stresses on the accuracy of the analytical results at nonuniform and transient heating conditions.

EPrint Type:	NASA Technical Memorandum
Keywords:	Hot structures, Modal analysis, Modal testing, Vibration analysis
Subjects:	(01 - 09) Aeronautics: (05) Aircraft Design, Testing And Performance (31 - 39) Engineering: (34) Fluid Mechanics and Thermodynamics (31 - 39) Engineering: (39) Structural Mechanics
ID Code:	263
Deposited On:	23 July 2004
Additional Information:	20 pages. Prepared as a conference paper for the SEM Structural Testing Technology at High Temperatures II Conference, Ojai, CA, Nov. 8–10, 1993.