Investigation of the Effects on the Engine Drive Shaft to Increased Electrical Power in Aircraft Applications

Paper #:
  • 2017-01-2033

  • 2017-09-19
In order to study the effects on the drive shaft connecting the generator and gearbox, a detailed model of the shaft with multiple degrees of freedom was developed. An accessory gearbox model was also included in order to simulate a more realistic load on the engine. The engine is modeled using NASA’s T-MATS (Toolbox for the Modeling and Analysis of Thermodynamic Systems) software. The dynamic Dual Spool High Bypass engine, model JT9D, was used for this study. A synchronous generator is connected to the high-pressure and low-pressure spool (one generator per spool). The overall system model is composed by the engine, the shaft, the gearbox, the generator, and the electric loads. The shaft is modeled through a direct connection between the generator and the engine. Lastly, the gearbox contains multiple different loads extracting power from the engine as well as the power losses associated with gears through friction and other means. A detailed analysis will be conducted and results will be presented. Results from the analysis will be verified against previously published shaft data on the impacts of pulsating loads. The analysis will be extended to include the gearbox dynamics. Acknowledgment
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