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An experimental approach to improve controllability in test rigs using passive components

Anders T Johansson (Institutionen för tillämpad mekanik, Dynamik) ; Thomas Abrahamsson (Institutionen för tillämpad mekanik, Dynamik)
Proceedings, International Conference on Noise and Vibration Engineering, ISMA2012; International Conference on Uncertainty in Structural Dynamics, USD2012. Editors : P. Sas, D. Moens, S. Jonckheere. KU Leuven (Belgium), 17 - 19 September 2012 p. 2367-2381. (2012)
[Konferensbidrag, refereegranskat]

The first step in successful vibration testing is to calculate input signals such that the test rig accurately replicates the reference signal. The Time Waveform Replication (TWR) method, or augmentations of it, is often used to this end. TWR and similar methods most often result in a test output which closely replicates, or tracks, the reference signal; however, if there are eigenmodes of the test specimen in the desired frequency range of the test which are uncontrollable, it can be shown that the output error cannot be removed beyond the uncontrollable state’s contribution to the reference trajectory. For those specific cases, a method to improve tracking by the use of passive control components designed using a validated finite element (FE) model of the test specimen has been previously proposed by the authors. In this article we propose instead an experimental approach, based on state-space substructure synthesis, to passive control components design for improved tracking in controllability-lacking test rigs.

Nyckelord: Dynamic testing, TWR, Substructure synthesis, controllability



Denna post skapades 2012-10-05. Senast ändrad 2015-07-02.
CPL Pubid: 164405

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik

Ämnesområden

Teknisk mekanik

Chalmers infrastruktur

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