• aircraft accessories
• aircraft engine
• Ansys script
• harmonic analysis
• Marco Ottolini
• Matlab script
• modal analysis
• structural damping
• transmissibility

The aim of this work is to create a mathematical model that enables the simulation
and investigation of the different dynamic behaviour of a substructure, when it is
attached to its assembly or placed on a shaker. This problem arises regularly when
components are tested for their reliability and can lead to significant over or under
testing, thereby introducing uncertainty into the test results. The present work
includes a review of the applied test procedures depending on the problem at hand
from high amplitude to fatigue failures. In a first step the two main configurations,
real - on the structure - and test - on the shaker - are modelled, and different kinds of
tests are simulated with a theoretical model in Matlab. Modal and harmonic analysis
are carried out for these models to allow the comparison between the configurations.
Afterwards a similar analysis is carried out with an FE code for more complex
models, where a part of an aircraft engine is consider with it’s generic accessories as
a substructures.