Abstract
In 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.
Highlights
In the aircraft manufacturing, interior panels are fastened to the fuselage structure by means of mountings designed to permit the easy disassembly in the case of maintenance
Isolators or dampers are of great practical relevance by their extensive use between fuselage and interior panels for minimizing the structure-borne vibration
Their proper representation in computer models helps the engineer on obtaining the accurate evaluation for vibration transmission paths between fuselage and interior panel, and the interior noise prediction
Summary
Interior panels are fastened to the fuselage structure by means of mountings designed to permit the easy disassembly in the case of maintenance. A classical method represents the set damperstructure as a mass-spring-damper system and it is useful at low frequency predictions (Nashif et al, 1985) This representation does not include some real system features, such as material nonlinearity and the component dynamic behavior. The structure-borne transmissibility to interior panels and the consequent noise radiation are considered as significant until 10 kHz. when dealing with the high-frequency range, FEA brings concerns such as the large model size and dynamic properties with some uncertainty. When dealing with the high-frequency range, FEA brings concerns such as the large model size and dynamic properties with some uncertainty As alternative to these issues, the traditional method of statistical energy analysis (SEA) (Lyon and DeJong, 1995), is considered. A comparison of results for both analyses is commented for the entire frequency range
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