An improved methodology for the virtual point transformation of measured frequency response functions in Dynamic Substructuring

Maarten V. Van Der Seijs, Daniël D. Van Den Bosch, Daniel J. Rixen, Dennis De Klerk

Research output: Contribution to conferencePaperpeer-review

76 Scopus citations

Abstract

Dynamic Substructuring methods play a significant role in the analysis of todays complex systems. Crucial in Dynamic Substructuring is the correct definition of the interfaces of the subsystems and the connectivity between them. Although this is straightforward practice for numerical finite element models, the experimental equivalent remains challenging. One of the issues is the coupling of the rotations at the interface points that cannot be measured directly. This work presents a further extension of the virtual point transformation that is based on the Equivalent Multi-Point Connection (EMPC) method and Interface Deformation Mode (IDM) filtering. The Dynamics Substructuring equations are derived for the weakened interface problem. Different ways to minimise the residuals caused by the IDM filtering will be introduced, resulting in a controllable weighting of measured Frequency Response Functions (FRFs). Also some practical issues are discussed related to the measurement preparation and post-processing. Special attention is given to sensor and impact positioning. New coherencelike indicators are introduced to quantify the consistency of the transformation procedures: sensor consistency, impact consistency and reciprocity.

Original languageEnglish
Pages4334-4347
Number of pages14
StatePublished - 2013
Event4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2013 - Kos Island, Greece
Duration: 12 Jun 201314 Jun 2013

Conference

Conference4th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering, COMPDYN 2013
Country/TerritoryGreece
CityKos Island
Period12/06/1314/06/13

Keywords

  • Experimental substructuring
  • Frequency based substructuring
  • NVH
  • Virtual point transformation

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