On the assessment of passive devices for structural control via real-time dynamic substructuring

Julian Mauricio Londoño Monsalve, G Serino, DJ Wagg, SA Neild, AJ Crewe

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)

Abstract

In this work, the applicability of a dynamic testing technique known as real-time dynamic substructuring (RTDS) for the assessment of passive vibration suppression systems in seismic protection of buildings is analysed. RTDS is an efficient method for the assessment of dynamic and rate-dependent behaviour of systems subjected to dynamic excitation at real scale and in real scenarios. The actuators used in RTDS test introduce additional undesirable dynamics into the system, which are often not fully compensated for in the actuator controller—these dynamics are commonly approximated as a feedback delay. To guarantee the validity and accuracy of an RTDS simulation, a stability analysis of the substructured system that includes the feedback delay should be carried out. In this paper, we present explicit analyses that provide a dynamic characterization of the delay-induced phenomena in RTDS simulations when considering passive vibration suppression systems with strong nonlinearities. We present a complete set of closed-form expressions to describe the main phenomena because of delay in terms of dynamic stability in an RTDS simulation. Through an experimental study, we confirm the existence of self-sustained oscillations caused by very small delay in the feedback loop. This lead the system to instability in the form of high-frequency oscillations.
Translated title of the contributionOn the assessment of passive devices for structural control via real-time dynamic substructuring
Original languageEnglish
Pages (from-to)701-722
Number of pages22
JournalStructural Control and Health Monitoring
Volume19
Issue number8
DOIs
Publication statusPublished - Dec 2012

Bibliographical note

Publisher: John Wiley & Sons, Ltd

Keywords

  • delayed systems
  • piecewise smooth dynamical systems
  • substructuring testing
  • DELAY COMPENSATION
  • SHAKING TABLE
  • ACTUATOR
  • SYSTEM
  • STABILITY
  • TESTS

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