Virtual Force Control Method for Real-Time Hybrid Simulation with Implicit Integration Algorithms

The hybrid simulation combines the physical test of critical part of a structure and the numerical calculation of the remainder. For hybrid simulation of systems with many degrees of freedom, an integration method with unconditional stability is highly desirable. Potential candidates are unconditionally stable implicit algorithms. However, as well as undesirable hysteretic loops which may be caused by oscillatory loading, iteration process with implicit methods could pose extra difficulties of iteration convergence for the high speed of testing execution in real-time simulation. To avoid these problems, this paper proposes a new method, named virtual force control method (VFCM), aiming to cancel the iteration process by the use of feedback control. The basic idea is to transfer the nonlinear implicit equilibrium into the form that can be interpreted as a force control problem. The word “virtual” here is used to distinguish from the conventional force control of actuator, because the actuator is still controlled in displacement mode with the VFCM. The dynamics of the actuator is simplified by a second order transfer function, based on which the controller design of the new method is presented. The numerical and experimental studies show that the testing results with proposed method agree well with the precise solution.

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    National Science Foundation

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    Huixian Earthquake Engineering Foundation

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    Harbin 150080,   China 

    Chinese Association of Earthquake Engineering

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    Harbin Heilongjiang 150080,   China 

    Multidisciplinary Center for Earthquake Engineering Research

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  • Authors:
    • Wu, Bin
    • Wang, Qianying
    • Ou, Jinping
  • Conference:
  • Publication Date: 2007-6-8

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Edition: Technical Report
  • Features: Figures; References;
  • Pagination: 8p
  • Monograph Title: Proceedings of the PRC-US Earthquake Engineering Forum for Young Researchers
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01343241
  • Record Type: Publication
  • Files: TRIS, USDOT
  • Created Date: Jun 21 2011 1:52PM