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Konstantinos G. Kyprianidis Module Development 3.4.2 Code modifications The code is based on work carried out by Pascovici et al. [144–147] on the prediction of engine/aircraft direct operating costs based on information from [98, 148]. Risk analysis capabilities were added in HESTIA by Colmenares [149], while Vigna Suria [150] worked on turbine blade and disc stress, creep and fatigue analysis. For the needs of NEWAC TERA2020, the author had to perform a partial reconstruction of HESTIA. Major code modifications include: • Overhaul of the entire code including defragmentation. • Complexity reduction step with respect to I/O operations. • Replacement of simplistic iterative algorithms in the stress calculations with methods from the LISIS library. • Calculation of direct operating cost breakdown in various formats i.e. per year, per flight, per block hour. • Update of the materials database and blade lifing assumptions to consider year 2020 entry into service engine designs. As a result of these modifications, the code’s computational speed and robust- ness has improved significantly, while numerical noise issues have essentially been eliminated; the latter formed an important bottleneck in the integration of HES- TIA within VITAL TERA2020 partially hindering the tool’s optimisation capa- bilities. Furthermore, lifing assumptions, and consequently time between over- haul calculations, are now more representative of year 2020 entry into service level of technology. 65PDF Image | Multi-disciplinary conceptual design of future jet engine systems
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