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Multi-DoF Interface Synchronization of Real-Time-Hybrid-Tests Using a Recursive-Least-Squares Adaption Law: A Numerical Evaluation

Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

Cyber Physical Testing or Real Time Hybrid Testing is a Hardware-In-The-Loop approach allowing for tests of structural components of complex machines with realistic boundary conditions by coupling virtual components. The need to actuate the physical interface makes the tests on structural systems challenging. In order to deal with stability and accuracy issues, we propose the use of an Adaptive Feed-Forward Cancellation approach with a Recursive Least Squares (RLS) adaption law for interface synchronization of harmonically excited systems. The interface forces are generated from multiple harmonic components of the excitation force. A RLS adaption law sets the amplitudes and phases of the harmonic interface force components and minimizes the interface gap. One major practical advantage of using a RLS adaption law is that only one forgetting factor has to be chosen compared to other adaption algorithms with various tuning parameters. As a consequence, it is possible to test systems with multiple interface DoF. In order to illustrate the performance and robustness of the proposed testing algorithm, the contribution includes a numerical investigation on a lumped mass system.

Keywords

  • Hybrid testing
  • Hardware-in-the-loop
  • Real-time substructuring
  • Interface synchronization
  • Recursive least squares

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Bartl, A., Mayet, J., Mahdiabadi, M.K., Rixen, D.J. (2016). Multi-DoF Interface Synchronization of Real-Time-Hybrid-Tests Using a Recursive-Least-Squares Adaption Law: A Numerical Evaluation. In: Allen, M., Mayes, R., Rixen, D. (eds) Dynamics of Coupled Structures, Volume 4. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-29763-7_2

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  • DOI: https://doi.org/10.1007/978-3-319-29763-7_2

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