Vibro-acoustical sensitivities of stiffened aircraft structures due to attached mass-spring-dampers with uncertain parameters

Publikationstyp
Journal Article
Date Issued
2021-07
Sprache
English
Author(s)
Seidel, Johannes  
Lippert, Stephan  
Estorff, Otto von  
Institut
Modellierung und Berechnung M-16  
TORE-DOI
10.15480/882.3654
TORE-URI
http://hdl.handle.net/11420/9880
Journal
Aerospace  
Volume
8
Issue
7
Article Number
174
Citation
Aerospace 8 (7): 174 (2021-07)
Publisher DOI
10.3390/aerospace8070174
Scopus ID
2-s2.0-85109385824
Publisher
Multidisciplinary Digital Publishing Institute
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.
Subjects
parameter uncertainties
fuzzy arithmetic
sensitivities
non-structural masses
secondary structure
DDC Class
600: Technik
620: Ingenieurwissenschaften
Funding(s)
LUFO V-2 - Entwicklung eines effizienten Verfahrens zur Berücksichtigung dynamischer Masseverteilungen in vibro-aktustischen Berechnungsmodellen für Flugzeugkabinen (DYMAV)  
Funding Organisations
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).
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by/4.0/
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