elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

Noise Reduktion in the Design of Structural Members made of Layered Polymer Composites Utilizing Finite-Damping-Elements

Schrader, E. und Hanselka, H. (1997) Noise Reduktion in the Design of Structural Members made of Layered Polymer Composites Utilizing Finite-Damping-Elements. In: Materials, Functionality & Design, Vol 4. NETHERLANDS SOCIETY FOR MATERIALS SCIENCE. 5th European Conference on Advanced Materials and Processes and Applications (Euromat 97), Maastricht, NL, 21-23. April 1997.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

The dynamic behaviour of structures depends on stiffness, mass, geometry and damping. Due to the high difference in damping ratios of fibre and viscoelastic resin, the damping ratio of composites varies with the mode of vibration. For a unidirectional reinforced specimen, the damping for a torsional mode is much higher than for a bending mode in the fibre direction. There are well-known methods available in the literature to determine the modal damping ratios of composites. They are based either on energy balancing or on complex modulus. Using classical laminate theory, one needs three independent input-values in addition to the elastic properties to describe the damping behaviour of a unidirectional reinforced layer. A first order shear deformation theory for transversally isotropic material requires one additional damping ratio corresponding to the interlaminar shear stresses in (2-3)-direction. Based on the Whitney-Pagano laminate theory, an energy-based method has been developed to determine all four damping-ratios from Finite-Element calculations and measurement results. In that way a full set of damping-ratios is determined. Using these values as input, a Finite-Element tool to optimize the modal damping behaviour of complex shell structures made of multilayer laminate has been developed.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=1999, monograph_id=4/511,
Titel:Noise Reduktion in the Design of Structural Members made of Layered Polymer Composites Utilizing Finite-Damping-Elements
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Schrader, E.NICHT SPEZIFIZIERT
Hanselka, H.NICHT SPEZIFIZIERT
Datum:1997
Erschienen in:Materials, Functionality & Design
Band:Vol 4
Verlag:NETHERLANDS SOCIETY FOR MATERIALS SCIENCE
Status:veröffentlicht
Veranstaltungstitel:5th European Conference on Advanced Materials and Processes and Applications (Euromat 97), Maastricht, NL, 21-23. April 1997
Veranstalter :Euromat
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:keine Zuordnung
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L TG - Querschnittstechnologien
DLR - Teilgebiet (Projekt, Vorhaben):NICHT SPEZIFIZIERT
Standort: Braunschweig
Institute & Einrichtungen:Institut für Faserverbundleichtbau und Adaptronik > Institut für Strukturmechanik
Hinterlegt von: Sibylle Wolff
Hinterlegt am:16 Sep 2005
Letzte Änderung:14 Jan 2010 15:34

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.