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- W2020808519 abstract "The effects of erosion and thermal degradation on the Space Shuttle Redesigned Solid Rocket Motor (RSRM) nozzle's structural dynamic characteristics were analytically evaluated. Also considered was stiffening of the structure due to internal pressurization. A detailed NASTRAN finite element model of the nozzle was developed and used to evaluate the influence of these effects at several discrete times during motor burn. Methods were developed for treating erosion and thermal degradation, and a procedure was developed to account for internal pressure stiffening using differential stiffness matrix techniques. Results were verified using static firing test accelerometer data. Fast Fourier Transform and Maximum Entropy Method techniques were applied to the data to generate waterfall plots which track modal frequencies with burn time. Results indicate that the lower frequency nozzle 'vectoring' modes are only slightly affected by erosion, thermal effects and internal pressurization. The higher frequency shell modes of the nozzle are, however, significantly reduced." @default.
- W2020808519 created "2016-06-24" @default.
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- W2020808519 date "1991-06-24" @default.
- W2020808519 modified "2023-09-25" @default.
- W2020808519 title "Space Shuttle Redesigned Solid Rocket Motor nozzle natural frequencyvariations with burn time" @default.
- W2020808519 doi "https://doi.org/10.2514/6.1991-2301" @default.
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