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- W3184982326 abstract "Currently, the best methods for determining the performance of a parachute are full scale testing and coupled computational fluid dynamics-computational structural dynamics simulations (CFD-CSD). The easier option of the two is the CFD-CSD simulations, but there is currently no way to validate their ability to simulate parachutes, as there is a lack of detailed experimental data for parachute fabric. In order to provide such data, an experimental campaign has begun at the United States Air Force Academy to determine the optimal conditions at which to collect validation data. These experiments tested a piece of F111 nylon at a variety of flow speeds and angles of attack to determine a condition where the fabric regularly vibrates and a condition where the fabric is mostly static. The results indicate that the fabric will vibrate at higher flow speeds for all angles of attack and lower angles of attack at lower flow speeds. At lower speeds the vibrations are more regular whereas at higher speeds the fabric motion is more chaotic. Experiments to determine the influence of boundary conditions found that, when the leading edge of the fabric was unconstrained there were significantly higher amplitude vibrations at lower angles of attack. The same experiments indicated that the fabric does not vibrate significantly at angles close to stall, which is likely due to the non-linear stress-strain relationship for this fabric resulting in smaller changes in strain at higher stresses. The optimal condition for gathering data on predictable fabric motion was found to be at an angle of attack of 2 degrees at a low freestream velocity (<15 m/s), and the best condition for a static validation test was determined to be an angle of attack between 10 degrees and 20 degrees also at a low freestream velocity." @default.
- W3184982326 created "2021-08-02" @default.
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- W3184982326 date "2021-07-28" @default.
- W3184982326 modified "2023-09-27" @default.
- W3184982326 title "Unsteady fabric vibration and the resulting wake velocity oscillations" @default.
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- W3184982326 doi "https://doi.org/10.2514/6.2021-2492" @default.
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