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- W4317583897 abstract "The National Aeronautics and Space Administration (NASA) has a significant maintenance challenge with aging wind tunnel infrastructure across the agency. Wind tunnel fan blades, such as the ones in the National Transonic Facility at NASA Langley Research Center, have been subjected to damage from impact and possibly from fatigue. Accurate numerical models of these fan blades are necessary to recertify the current fan blades, and to support design and certification of replacement fan blades. In this paper, a detailed finite element model of these fan blades with the capability of representing damage is presented. An eigenvalue analysis of the fan blade was performed to estimate the natural frequencies, which are compared to legacy test data obtained in 1992. Additional numerical studies of the effect of delamination damage on the natural frequencies of the fan blade were conducted and compared to the 1992 test data. Delamination damage was simulated in the numerical model by separation of composite layers representing the airfoil from the spar box. Differences in the natural frequencies between the baseline model and models with simulated damage were used to evaluate the influence of damage on fan blade performance. The predicted natural frequencies and mode shapes showed good correlation to the experimental results obtained from legacy test data." @default.
- W4317583897 created "2023-01-21" @default.
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- W4317583897 date "2023-01-19" @default.
- W4317583897 modified "2023-10-18" @default.
- W4317583897 title "Modal Test and Analysis Correlation of Wind Tunnel Blades for the National Transonic Facility" @default.
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- W4317583897 doi "https://doi.org/10.2514/6.2023-1321" @default.
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