Hybrid simulation is a technique for testing mechanical systems with nonlinear parts that are difficult to model numerically. In hybrid simulation these parts are tested in an experiment while the rest of the system is simulated numerically. As the data between simulation and experiment must be interchanged in real time, RTFEM stands for Real-Time Finite Element Method. If the mechanical system has got a relatively large number of degrees of freedom, real-time computations may be difficult or even impossible to perform in real-time, even with modern hardware. Therefore the order of the model must be reduced. Authors propose using metamodeling techniques for that purpose. Metamodel is a simplified model of a model - a mathematical relation representing dependence between input and output. In hybrid simulation it is used to imitate the behavior of the linear subsystem on the boundary with the nonlinear subsystem.
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