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

Continuum Methods for Large Flexible Structures, Executive Summary Report, 11624/95/NL/JG(SC)

Netz, P. (2001) Continuum Methods for Large Flexible Structures, Executive Summary Report, 11624/95/NL/JG(SC). Project Report. 1, 47 S.

Full text not available from this repository.

Abstract

The subject of the project Continuum Methods for Large Flexible Structures is the improvement of the Dynamic Stiffness Method (DSM) for application to large flexible spacecraft, e.g. satellites with flexible appendages. The method is especially suitable for use in modal analysis. The DSM may also be helpful during pre-design of structures as a fast as well as highly accurate tool. With respect to numerical procedures non-linear effects as well as gyroscopic ones in case of spin-stabilised satellites have to be presented. Externally applied effects like gravity or thermal loading in space have not been considered.Within the DSM forces and moments acting on a structure are related by the dynamic stiffness matrix, often called impedance matrix, to the translational and rotational system degrees of freedom. It has been among others developed and used at ESA/ESTEC since the mid seventies. It was incorporated into a fast and easily applicable computer programmes (DISTEL, VAMP) containing an element library and algorithms of solution procedures. The state of development and application at ESA/ESTEC is illustrated by examples.The inherent capacity of extending the DSM to more complex spacecraft configurations, especially to rotating ones has been examined. Surveying the theoretical background of analytical dynamics the important methods in use are compared with the DSM to show its advantages in modal analysis. Consequently, the existing discrete and continuous elements developed for use within the DSM are presented and extended by flexible booms attached to spinning spacecraft. On the basis of the non-linearly pre-deformed, quasi-static equilibrium state the dynamic stiffness matrices to analyse small vibration about this state have been derived. The element library has also been extended by procedures to include measured relations to a stiffness matrix.Rules of assembling structures of several elements, procedures to determine the equilibrium state, to assess stability of a dynamic structural system, and the problem of transcendental eigenvalues and modes have been discussed by presenting the available solution methods.

Document Type:Monograph (Project Report)
Additional Information: LIDO-Berichtsjahr=2001,
Title:Continuum Methods for Large Flexible Structures, Executive Summary Report, 11624/95/NL/JG(SC)
Authors:
AuthorsInstitution or Email of Authors
Netz, P.UNSPECIFIED
Date:2001
Number of Pages:47
Series Name:11624/95/NL/JG(SC)
Institution:European Space Agency (ESA)
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignement
DLR - Program:no assignment
DLR - Research theme (Project):UNSPECIFIED
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Institut für Strukturmechanik
Deposited By: Sibylle Wolff
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 16:18

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.