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Robustness of Modal Parameter Estimation Methods Applied to Lightweight Structures

  • Kristoffer A. Dickow
  • Poul Henning Kirkegaard
  • Lars V. Andersen
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

On-going research is concerned with the losses that occur at junctions in lightweight building structures. Recently the authors have investigated the underlying uncertainties related to both measurement, material and craftsmanship of timber junctions by means of repeated modal testing on a number of nominally identical test subjects. However, the literature on modal testing of timber structures is rather limited and the applicability and robustness of different curve fitting methods for modal analysis of such structures is not described in detail. The aim of this paper is to investigate the robustness of two parameter estimation methods built into the commercial modal testing software B&K Pulse Reflex Advanced Modal Analysis. The investigations are done by means of frequency response functions generated from a finite-element model and subjected to artificial noise before being analyzed with Pulse Reflex. The ability to handle closely spaced modes and broad frequency ranges is investigated for a numerical model of a lightweight junction under different signal-to-noise ratios. The selection of both excitation points and response points are discussed. It is found that both the Rational Fraction Polynomial-Z method and the Polyreference Time method are fairly robust and well suited for the structure being analyzed.

Keywords

Lightweight structure modal analysis parameter estimation robustness finite element 

Notes

Acknowledgements

The present research is part of the Interreg project “Silent Spaces”, funded by the European Union. The authors highly appreciate the financial support.

References

  1. 1.
    Dickow KA, Andersen LV, Kirkegaard PH (2012) An evaluation of test and physical uncertainty of measuring vibration in wooden junctions. In: Proceedings of ISMA2012/USD2012, Leuven, Belgium, September 2012Google Scholar
  2. 2.
    ABAQUS Analysis (2010) User’s manual version 6.10. Dassault Systmes Simulia Corp., ProvidenceGoogle Scholar
  3. 3.
    Allemang RJ (2003) The modal assurance criterion – twenty years of use and abuse. Sound Vib 37:14–23Google Scholar

Copyright information

© The Society for Experimental Mechanics, Inc. 2013

Authors and Affiliations

  • Kristoffer A. Dickow
    • 1
  • Poul Henning Kirkegaard
    • 1
  • Lars V. Andersen
    • 1
  1. 1.Department of Civil EngineeringAalborg UniversityAalborgDenmark

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