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- W749394038 abstract "The results of a modal transient analysis of the engine/aircraft system are presented. The response of the JT9D to analytically simulated vertical gusts and landings was predicted using a NASTRAN finite element mathematical model of the JT9D/747 propulsion system. The NASTRAN finite element model of the propulsion system included engine structural models of the fan, low/high pressure compressors, diffuser/turbine cases, and high/low pressure rotors, as well as nacelle models of the inlet cowl, tailcone, and wing pylon. The analysis conducted predicts that an insignificant level of JT9D-7 performance deterioration would occur due to a typical vertical gust encounter or a typical revenue service landing. Analysis of a high sink rate landing with a heavy fuel load indicates the possibility of local wear, however, the lack of an accurate dynamic rotor/seal interference model precludes an accurate quantitative evaluation of performance change for this once-per-airframe-life event." @default.
- W749394038 created "2016-06-24" @default.
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- W749394038 date "1979-08-21" @default.
- W749394038 modified "2023-09-25" @default.
- W749394038 title "Effect of time dependent flight loads on JT9D-7 performance deterioration" @default.
- W749394038 hasPublicationYear "1979" @default.
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