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Using Mode Shape Expansion Techniques for Pretest Analysis and Correlation

Gloth, G. (2000) Using Mode Shape Expansion Techniques for Pretest Analysis and Correlation. In: Proceedings, pp. 1237-1243. XVIII International Modal Analysis Conference (IMAC), San Antonio/Texas, USA, 7-10 February 2000.

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Abstract

When comparing analytical data from a FE model with experimental data from a modal survey test, the number of degrees-of-freedom in the analytical model is usually by far greater than the number of measured degrees-of-freedom. To overcome this problem, a reduction of the FE model is often considered to be the most reliable way. However, in some cases it is inevitable to expand mode shapes, for example in the presence of rotational degees-of freedom in the dynamic model. A situation which is frequently encountered in aircraft simulation. The paper evaluates the benefits of several mode shape expansion techniques like the SEREP method, a purely geometric interpolation scheme and a generalized static expansion method. This is done not only in view of correlation purposes after the test, but also for pretest analysis. Some of the methods can be used to assess the quality of the accelerometer plan and, thus, to optimize the set of measurement locations. Using two examples, a simple beam model and an aircraft model, it is shown that the generalized static expansion technique provides a good trade-off between accuracy, simplicity and robustness with respect to noise in the measured data and errors in the FE model. It also provides an excellent measure for the quality of the pick-up plan.

Item URL in elib:https://elib.dlr.de/14530/
Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2005,
Title:Using Mode Shape Expansion Techniques for Pretest Analysis and Correlation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gloth, G.UNSPECIFIEDUNSPECIFIED
Date:2000
Journal or Publication Title:Proceedings
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1237-1243
Status:Published
Keywords:Generalised Static Expansion, Finite Element Model, Experimental Modal Analysis
Event Title:XVIII International Modal Analysis Conference (IMAC), San Antonio/Texas, USA, 7-10 February 2000
Organizer:Society for Experimental Mechanics Inc.
HGF - Research field:other
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:no assignment
DLR - Program:no assignment
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 21:58

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