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Proceedings 2018, 2(8), 378; https://doi.org/10.3390/ICEM18-05196

A Robust Test-Based Modal Model Identification Method for Challenging Industrial Cases

1
Vrije Universiteit Brussel (VUB). Pleinlaan 2, B-1050 Brussel, Belgium
2
Mechanical Design Department, Helwan University, Cairo 11782, Egypt
3
Siemens Industry Software, Interleuvenlaan 68, B-3001 Leuven, Belgium
Presented at the 18th International Conference on Experimental Mechanics, Brussels, Belgium, 1–5 July 2018.
*
Author to whom correspondence should be addressed.
Published: 4 May 2018
PDF [435 KB, uploaded 29 May 2018]

Abstract

Abstract: In this paper, the MLMM modal parameter estimation method (Maximum Likelihood estimation of a Modal Model) and its new variant will be introduced. The MLMM method tackles some of the remaining challenges in modal analysis (e.g., modal analysis of highly-damped cases where a large amount of excitation locations is needed such as the modal analysis of a trimmed car body). Another big advantage of the MLMM method is its capability to fully integrate, within the estimated modal model, some important physical constraints, which are required for the intended applications, e.g., realness of the mode shape and FRFs reciprocity. More classical modal parameter estimation methods have rarely the possibility to fully integrate these constraints and the obtained modal parameters are typically altered in a subsequent step to satisfy the desired constraints. It is obvious that this may lead to sub-optimal results. The MLMM method uses the Levenberg-Marquardt optimization scheme to directly fit the modal model to the measured FRFs. The applicability of MLMM to estimate an accurate constrained modal model will be demonstrated using two challenging industrial applications.
Keywords: modal analysis; modal parameter identification; modal model modal analysis; modal parameter identification; modal model
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Mahmoud, E.-K.; Bart, P.; Theo, G.; Patrick, G. A Robust Test-Based Modal Model Identification Method for Challenging Industrial Cases. Proceedings 2018, 2, 378.

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