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Initial Results from Experimental Dynamic Load Simulation by means of Modal Force Vectors.

Breitbach, E. and Sinapius, M. (1991) Initial Results from Experimental Dynamic Load Simulation by means of Modal Force Vectors. In: DGLR-Bericht 91-06, 91-090, pp. 288-294. Int. Forum on Aeroelasticity and Structural Dynamics 1991 Combined with a One-Day Workshop on Smart Material Systems and Structures, June 3-6, 1991, Eurogress Center, Aachen..

Full text not available from this repository.

Abstract

Increase of size and recent advances in lightweight design of space systems have led to the requirement of new approaches to structural dynamic testing techniques. The paper gives a brief survey of different qualification methods based on single-axis and multi-axis testing. A new concept called the modal force combination (MFC) method is proposed, in which the base excitation of a spacecraft due to various load events can be simulated by a set of forces acting directly in specially selected structural points. The forces compensate for the d'Alembert's inertia forces arising due to the transient multi-axial base accelration. The forcesare specially conditioned by a series expansion of so-called modal force distribution so that they produce the same deformations and accelerations in the structure as would occur by base excitation. Two versions of the MFC concept are presented in the paper. The first uses arbitrary orthogonal force vectors in the vicinity of the resonance frequencies, and the second is based on transfer functions.Initial experimental results are presented, taken from an applicationof the technique on a three-dimensional test structure. The results of experimental dynamic load simulation by means of modal force vectors are compared with measurements from base excitation performed on DLR's multi-axis vibration simulator MAVIS 2. In conclusion, the presented MFC versions are discussed.

Item URL in elib:https://elib.dlr.de/39444/
Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1991, pages=8,
Title:Initial Results from Experimental Dynamic Load Simulation by means of Modal Force Vectors.
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Breitbach, E.UNSPECIFIEDUNSPECIFIED
Sinapius, M.UNSPECIFIEDUNSPECIFIED
Date:1991
Journal or Publication Title:DGLR-Bericht 91-06
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:91-090
Page Range:pp. 288-294
Status:Published
Keywords:Dynamic qualification, multi-axis transient test, flight load similation, modal force combination.
Event Title:Int. Forum on Aeroelasticity and Structural Dynamics 1991 Combined with a One-Day Workshop on Smart Material Systems and Structures, June 3-6, 1991, Eurogress Center, Aachen.
HGF - Research field:UNSPECIFIED
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:no assignment
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 10:43

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