Effect of Actuator Delay on Uncertainty Quantification for Real-Time Hybrid Simulation

Abstract eng:
Analysis of uncertainties in numerical substructure is necessary to estimate the variance of structural response obtained from structural experiments through the hybrid simulation technique. In a real-time hybrid simulation, the servo-hydraulic actuators apply the desired responses to the experimental substructures in a real-time manner. It has been observed that actuator delay could be reduced but cannot be eliminated. In this study, the effect of actuator delay on uncertainty quantification is investigated for real-time hybrid simulation through polynomial chaos expansion. Responses of a singledegree-of-freedom system are projected on a series of orthogonal stochastic functions then represented using simple polynomials. The mean and variance from polynomial chaos expansion are compared between the cases with and without delay. Actuator delay in a real-time hybrid simulation is observed to result in increases of mean and variance for the structural responses. Sensitivity analysis also indicates actuator delay can affect the variance on uncertainty quantification in real-time hybrid simulation.

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