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Development and numerical investigation of a new predictor-corrector algorithm for force-based hybrid simulation

Hybrid simulation is a versatile, powerful and economical method for modeling large and complex structural systems, combining numerical and experimental models. While the hybrid simulation technique has been used in seismic simulation, application to the other dynamic loads such as strong wind, hurricane and tsunami have been limited. One of the reasons is because displacement based formulation and control used in the conventional hybrid simulation are not always suitable. This study explores a force-based formulation in hybrid simulation. In particular, a new numerical integration method, called weighted Predictor-Corrector force-based algorithm is proposed herein. In the proposed algorithm, force is first predicted in an intermediate step, according to responses at the previous step. The predicted force is imposed to the experiment using force control, and the corresponding displacement is then measured and sent back to the numerical algorithm. Responses at the next step are calculated based on the measured displacement through a correction procedure. Thus, the proposed algorithm enables force-based formulation and allows for force control in hybrid simulation. A preliminary numerical simulation is performed to verify applicability of this proposed algorithm. The numerical simulation demonstrates that this algorithm provides stable and accurate results in force-based hybrid simulation. This paper presents details of the algorithm and the preliminary numerical results.

Author(s):

Bahareh Forouzan    
Clarkson University
United States

Narutoshi Nakata    
Clarkson University
United States