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Publisher DOI: 10.3390/aerospace8070174
Title: Vibro-acoustical sensitivities of stiffened aircraft structures due to attached mass-spring-dampers with uncertain parameters
Language: English
Authors: Seidel, Johannes 
Lippert, Stephan 
Estorff, Otto von 
Keywords: parameter uncertainties;fuzzy arithmetic;sensitivities;non-structural masses;secondary structure
Issue Date: Jul-2021
Publisher: Multidisciplinary Digital Publishing Institute
Source: Aerospace 8 (7): 174 (2021-07)
Journal: Aerospace 
Abstract (english): 
The slightest manufacturing tolerances and variances of material properties can indeed have a significant impact on structural modes. An unintentional shift of eigenfrequencies towards dominant excitation frequencies may lead to increased vibration amplitudes of the structure resulting in radiated noise, e.g., reducing passenger comfort inside an aircraft’s cabin. This paper focuses on so-called non-structural masses of an aircraft, also known as the secondary structure that are attached to the primary structure via clips, brackets, and shock mounts and constitute a significant part of the overall mass of an aircraft’s structure. Using the example of a simplified fuselage panel, the vibro-acoustical consequences of parameter uncertainties in linking elements are studied. Here, the fuzzy arithmetic provides a suitable framework to describe uncertainties, create combination matrices, and evaluate the simulation results regarding target quantities and the impact of each parameter on the overall system response. To assess the vibrations of the fuzzy structure and by taking into account the excitation spectra of engine noise, modal and frequency response analyses are conducted.
DOI: 10.15480/882.3654
ISSN: 2226-4310
Institute: Modellierung und Berechnung M-16 
Document Type: Article
Project: LUFO V-2 - Entwicklung eines effizienten Verfahrens zur Berücksichtigung dynamischer Masseverteilungen in vibro-aktustischen Berechnungsmodellen für Flugzeugkabinen (DYMAV) 
Funded by: Bundesministerium für Wirtschaft und Energie - BMWi 
More Funding information: This work was made possible by the aviation research program LUFO V-2 FLIGHTLAB. The authors gratefully acknowledge the project funding by the Federal Ministry for Economic Affairs and Energy due to an act of the German Parliament (project funding number 20K1511F).
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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