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The Experimental Investigation of Dynamic Load Simulation by means of Modal Force Vectors.

Sinapius, M. and Brunner, O. (1) and Mendoza, M. (1) (1993) The Experimental Investigation of Dynamic Load Simulation by means of Modal Force Vectors. 2nd International Symposium "Environmental Testing for Space Programmes", October 12 - 15, 1993, Noordwijk, The Netherlands.

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Abstract

The increase of dimensions and recent advances in lightweight design of space systems have led to the requirement of new structural dynamic qualification techniques. Dynamic qualification means experimental simulation of the structural dynamic environment in order to check the dynamic behaviour of spacecraft. Presently, structural dynamic qualification of space systems is accomplished by means of single-axis electrodynamic shaker systems. For the last ten years multi-axis hydraulic shaker systems have also been under investigation to supplement and possibly replace the current single-axis testing philosophy. Both methods apply base acceleration at the interface between the satellite and launcher. Thus, they require high forces in order to accelerate the total mass of the teststructure. An alternative test philosophy was proposed and investigated in a study founded by ESA. The new concept called the Modal Force Combination (MFC) technique replaces the base acceleration by having a set of forces acting directly in a selected number of structural points. The forces compensate for the d'Alembert's inertia forces, which arise due to the transient multi-axial base acceleration. The transient forcing functions are calculated by means of modal deformations and related modal force distributions in order to get the same structural responses of the structure as would occur by base acceleration. The direct substitution of distributed forces by means of a set of single forcesyielding the same responses is generally impossible. This would require too many exciters. However, the MFC method offers two possibilites to perform a simulation. The first version is based on the demand for the equality of the input energy expressed by means of the modes of vibration. The second version starts with the demand for the equality of the structural responses in the pointsof

Item URL in elib:https://elib.dlr.de/39574/
Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1993, pages=6,
Title:The Experimental Investigation of Dynamic Load Simulation by means of Modal Force Vectors.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Sinapius, M.UNSPECIFIEDUNSPECIFIED
Brunner, O. (1)UNSPECIFIEDUNSPECIFIED
Mendoza, M. (1)UNSPECIFIEDUNSPECIFIED
Date:1993
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Dynamic qualification, Flight load simulation, multi-axis transient test, modal force combination.
Event Title:2nd International Symposium "Environmental Testing for Space Programmes", October 12 - 15, 1993, Noordwijk, The Netherlands
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:UNSPECIFIED
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: DLR-Beauftragter, elib
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 10:47

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