This study summarized the achievement in real-time numerical simulation for RTHS. Two theoretically feasible solving methods respectively based on parallel-computing and surrogate model were discussed.

In this paper, long-short-term memory (LSTM) is applied to the coupling vibration study of the train-bridge system, and an RTHS framework for semi-active vibration damping device-train-suspension bridge coupling is established to illustrate the test logic and feasibility, and a dynamic response solution method of numerical substructure based on LSTM is proposed. Then, the feasibility of the network models in RTHS was analyzed, and the predicted performance of the trained network models was evaluated by time course comparison, regression analysis, and normalized error distribution. Finally, the LSTM was applied to a train-bridge RTHS, verify its accuracy and real-time performance, and the results show that the proposed method can effectively improve the accuracy and efficiency of solving the numerical substructure.

An effective sampling method is proposed and evaluated in this study by integrating cross validation-Voronoi (CV-V) and entropy (EP) strategies. Computational simulations of hybrid tests of two different nonlinear systems are further conducted using the proposed method for uncertainty quantification. The proposed method is demonstrated to provide great potential for uncertainty quantification through hybrid simulation.

Due to limited equipment resources of structural laboratories, the complex boundary conditions of the experimental substructure were often not completely realized in hybrid simulations. This paper proposed a method to deal with the incomplete boundary conditions in hybrid simulations by correcting the restoring force of the experimental substructure with an auxiliary numerical model.

In this study, taking the 5 MW Braceless floating offshore wind turbine as the research object, a conceptual design of a real-time hybrid model test system for Braceless offshore wind turbines is proposed. Six sets of working conditions are set for simulation to study the motion and force performances of the hybrid system. The performance requirements of the Braceless structure for the loading device in the real-time hybrid test are quantified.