STRUCTURE-BORNE TRANSMISSIBILITY EVALUATION THROUGH MODELING AND ANALYSIS OF AIRCRAFT VIBRATION DAMPERS doi: 10.5028/jatm.2011.03021611
Keywords:Vibration damper, Fuselage structures, Vibroacoustic, Dynamic stiffness, SEA.
AbstractIn the aircraft industry a great practical relevance is given to the
extensive use of vibration dampers between fuselage and interior panels.
The proper representation of these isolators in computer models is of vital
importance for the accurate evaluation of the vibration transmission paths for
interior noise prediction. In general, simplifi ed models are not able to predict
the component performance at mid and high frequencies, since they do not
take into account the natural frequencies of the damper. Experimental tests
are carried out to evaluate the dynamic stiffness and the identifi cation of the
material properties for a damper available in the market. Different approaches
for its modeling are analyzed via FEA, resulting in distinct dynamic responses
as function of frequency. The dynamic behavior, when the damper natural modes
are considered jointly with the high modal density of the plate that represents
the fuselage, required the averaging of results in the high frequency range. At
this aim, the statistical energy analysis is then used to turn the comparison
between models easier by considering the averaged energy parameters. From
simulations, it is possible to conclude how the damper natural modes infl uence
the dynamic response of aircraft interior panels for high frequencies.
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