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Experimental Mechanics
Published in: Experimental Mechanics 8/2017

06-07-2017

An Experimental Evaluation of Two Potential Improvements for 3D Laser Vibrometer Based Operational Modal Analysis

Authors: S. Marwitz, V. Zabel

Published in: Experimental Mechanics | Issue 8/2017

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Abstract

The use of scanning laser doppler vibrometers (SLDV) is common practice in the context with experimental modal analysis. In recent years, commercial 3D SLDV have been developed, where three laser heads simultaneously point to the same measuring point and an input reference signal is used to combine the results of consecutive records. If the input reference signal is replaced by an additional output reference signal, an operational modal analysis (OMA) can be performed. However, in this case the use of single-point measurements may lead to difficulties identifying certain vibrational modes. Two improvements to reduce these issues were developed in this study: the application of pre-estimation multi-setup merging methods and the use of multi-point measurements with post-estimation coordinate transformation. An enhancement for the application of OMA methods is shown in both cases. In this context there are different possibilities to obtain output reference signals: a) from additional accelerometers or vibrometers and b) from the scan heads of the 3D SLDV itself. Their suitability is investigated in terms of data acqusition, modal analysis and multi-setup merging. Additionally, the feasibility of a “no-reference” measurement is shown. The developed methods have been applied to experimental data using the stochastic subspace identification (cov/ref) and three multi-setup merging methods.
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Footnotes
1
Test series III was conducted originally but deemed redundant and thus not used in the scope of this study.
 
2
In [20] it is indicated that the MPC can be computed as the Modal Assurance Criterion (MAC) [21] of the modeshape {ϕ r,n } with its complex conjugate {ϕ r,n }T∗.
 
3
Rotating {ϕ r,n } in the complex plane by −MP(ϕ r,n ) yields the MPD as the (uncorrected sample) standard deviation σ({x}) of the phase angle of the rotated modeshape.
 
4
Box plots are a way to show the statistical properties of multiple datasets in a single plot. The box shows the upper and lower quartiles (interquartile range) and the line the median of the data. Whiskers showing the range and flier points showing all remaining statistical outliers may be drawn as well [23].
 
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Metadata
Title
An Experimental Evaluation of Two Potential Improvements for 3D Laser Vibrometer Based Operational Modal Analysis
Authors
S. Marwitz
V. Zabel
Publication date
06-07-2017
Publisher
Springer US
Published in
Experimental Mechanics / Issue 8/2017
Print ISSN: 0014-4851
Electronic ISSN: 1741-2765
DOI
https://doi.org/10.1007/s11340-017-0307-x

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