Mechanical system finite element model refinement using experimental modal analysis

S. M. Nikolaev, I. A. Kiselev, S. A. Voronov

Research output: Contribution to conferencePaperpeer-review

3 Citations (Scopus)

Abstract

In this paper we developed a computational-experimental method of dynamic system parameter identification using modal analysis. The work can be divided into three stages: modal testing, modal parameter estimation and modeling with the received parameters, adjustment of the calculated FE (Finite Element) model based on the modal model. We developed software package for constructing of a mathematical model with the parameters obtained by modal testing in the programming environment Matlab. On the first stage of estimation we evaluate the global parameters (damping, eigenfrequency), on the second - local parameters (eigenvector components). These parameters are chosen independently for each mode shape by the method of least squares in the nonlinear formulation. We used well-known algorithm of topology optimization for correction of FE model. Developed algorithm differs from others in the following aspects. There are changes in the properties of the material in each FE, so that convergence criterion has been satisfied instead of deleting or adding FE. This paper focuses on the technique for the computing model adjustment. The brief procedure for carrying out modal tests and modal parameters assessment is shown below.

Original languageEnglish
Pages1-9
Number of pages9
Publication statusPublished - 2013
Externally publishedYes
Event5th International Operational Modal Analysis Conference, IOMAC 2013 - Guimaraes, Portugal
Duration: 13 May 201315 May 2013

Conference

Conference5th International Operational Modal Analysis Conference, IOMAC 2013
Country/TerritoryPortugal
CityGuimaraes
Period13/05/1315/05/13

Keywords

  • Estimation
  • FEM refinement
  • Modal

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