Alessandro Santilli
Acoustic Structural Interactions in Rotor Cavities of an Aeronautical Engine.
Rel. Teresa Maria Berruti, Antonio Giuseppe D'Ettole. Politecnico di Torino, Master of science program in Mechanical Engineering, 2024
Abstract
This Master’s Thesis work is developed in collaboration with GE Avio Aero and its goal is to analyze possible solutions to assess the vibroacoustic phenomena within the aeronautical engine cavities. These cavities, mainly contoured by turbine disks, are complex environments where coupling between acoustic waves and structural vibrations can significantly threaten the integrity of the mechanical components. The acoustic waves are basically dynamic pressure fluctuations that can grow in time if excited at the acoustic natural frequency of the cavity and that can couple with the structural vibration modes, potentially leading to excessive vibrations and, consequently, High Cycle Fatigue (HCF) phenomena.
In these domains, where some portion of air is taken from the compressor to contribute to the cooling purpose of the mechanical components, different sources of pressure excitation can coexist, usually not clearly distinguishable and predictable
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