Real-Time Error Correction in Fast Pseudodynamic Testing: a Numerical Study

Abstract eng:
Undershooting error is a common error in fast pseudodynamic (PSD) tests as a result of inherent actuator lag. This type of systematic error introduces energy into a system, which if not monitored or controlled, can result in test instability and causes the response to grow exponentially. This leads to premature termination of a test and unreliable result. By considering the systematic error as negative damping in a structure, this paper proposes an intuitive error-correction scheme to compensate for the error. The key to this scheme is the introduction of a variable amount of viscous damping at every integration time step during the pseudodynamic test. The amount of time-varying viscous damping is derived by equating the magnitude of the energy error with that dissipated by the introduced damping at every integration time step. The accuracy and simplicity of the proposed error-correction scheme is demonstrated through numerical simulations of a linear-elastic SDOF structure and a two DOF structure subjected to sinusoidal ground motions.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket