elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Passive Damping of Spacecraft Sandwich Panels

Romberg, Oliver and Tausche, Matthias and Pereira, Carlos and Panning, Lars (2007) Passive Damping of Spacecraft Sandwich Panels. In: 1st CEAS European Air and Space Conference 2007. 1st European Air and Space Conference, 2007-09-10 - 2007-09-13, Berlin, Germany. ISSN 0700-4083

Full text not available from this repository.

Abstract

The damping ratio of a structural system has large influence on the structural response and, thus, on the stress. If the damping factor increases the stress decreases drastically, which is necessary for the operation of future reusable launch vehicles as well as to relax dynamical requirements for conventional spacecraft. In the frame of the here described activities a system of passive friction damping elements has been designed which is placed between the face sheets of large spacecraft relevant composite sandwich panels. Presently, corresponding demonstrators are in manufacturing process. Dynamical and thermal test will be performed in near future. In parallel investigations regarding the mass saving potential as well as the life span extension due to increased damping are performed. The influence on the life span will be clarified by means of S-N-curves [MIL 5H], where the critical stress (crack) is depicted versus the load cycles (= life span in case of continuous vibrating structures). Depending upon the material as well as upon the structure there are empirical results showing a decreasing boundary stress with increasing number of load cycles. Instead of steel which shows a horizontal tangent of critical stress for load cycles composite materials have a steady decreasing S-N-curve. Thus, the life span of those materials are directly affected by the number of load cycles in combination with the vibration amplitude. The degree of life span extension depends strongly upon the material, the structure and the load cases and can be quantified for individual cases only. In any case the impact of long term application, wear and temperature impact have to be considered, too.

Document Type:Conference or Workshop Item (Paper)
Title:Passive Damping of Spacecraft Sandwich Panels
Authors:
AuthorsInstitution or Email of Authors
Romberg, OliverUNSPECIFIED
Tausche, MatthiasOHB-System AG
Pereira, CarlosRUAG AG
Panning, LarsUniversität Hannover
Date:13 September 2007
Journal or Publication Title:1st CEAS European Air and Space Conference 2007
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
DGLR, UNSPECIFIED
ISSN:0700-4083
Keywords:Spacecraft Structure, Dynamical Loads, Mechanical Damping, Passive Damping, Friction Damping
Event Title:1st European Air and Space Conference
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:2007-09-10 - 2007-09-13
Organizer:DGLR
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W - no assignement
DLR - Research theme (Project):W -- no assignement (old)
Location: Bremen
Institutes and Institutions:Institute of Space Systems > Systemanalyse Raumsegmente
Deposited By: Dr.-Ing. Oliver Romberg
Deposited On:27 Dec 2007
Last Modified:27 Apr 2009 14:19

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.