Real-time distributed hybrid testing: Coupling geographically distributed scientific equipment across the Internet to extend seismic testing capabilities

Mobin Ojaghi*, Martin S. Williams, Matt S. Dietz, Anthony Blakeborough, Ignacio Lamata Martínez

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

11 Citations (Scopus)

Abstract

Large-scale testing and qualification of structural systems and their components is crucial for the development of earthquake engineering knowledge and practice. However, laboratory capacity is often limited when attempting larger experiments due to the sheer size of the structures involved. To overcome traditional laboratory capacity limitations, we present a new earthquake engineering testing method: real-time distributed hybrid testing. Extending current approaches, the technique enables geographically distributed scientific equipment including controllers, dynamic actuators and sensors to be coupled across the Internet in real-time. As a result, hybrid structural emulations consisting of physical and numerical substructures need no longer be limited to a single laboratory. Larger experiments may distribute substructures across laboratories located in different cities whilst maintaining correct dynamic coupling, required to accurately capture physical rate effects. The various aspects of the distributed testing environment have been considered. In particular, to ensure accurate control across an environment not designed for real-time testing, new higher level control protocols are introduced acting over an optimised communication system. New large time-step prediction algorithms are used, capable of overcoming both local actuation and distributed system delays. An overview of the architecture and algorithms developed is presented together with results demonstrating a number of current capabilities.

Original languageEnglish
Pages (from-to)1023-1043
Number of pages21
JournalEarthquake Engineering and Structural Dynamics
Volume43
Issue number7
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Distributed
  • Dynamic
  • Hybrid testing
  • Internet
  • Prediction
  • Real time

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