Digital twins for the underwater shake table array facility

Abstract

AbstractIn this study, the three‐dimensional six‐degree‐of‐freedom underwater shaking table array facility for seismic simulation, which is built in Tianjin University, China, is taken as the research object. A digital twin of the shaking table is constructed. First, the components of the underwater shaking table array are introduced. And the simplified mechanical property of different components is illustrated. By using the system identification algorithm based on the measured dynamic responses, the basic model parameters, including the dynamics of the servo‐valve, the horizontal and vertical effective mass, the effective stiffness and damping coefficient of the actuators, the accumulators, and the friction of each actuator in the system are identified. The suitability of various experimental data sets used to identify the digital twin's model parameters is described. The prediction of various shaking table testing instances, as well as the comparison of digital twin and real system performance, are then presented. The digital twins shaking table system's performance and accuracy are examined. The shaking table's performance for various reproduction signals is compared to the digital twins model, which validates the suggested model's feasibility. Finally, the digital twins model is adopted and tried to tune the facility offline meanwhile the shaking table facility is configured iteratively. These findings highlight the applicability of the digital twins technique, which is the next research direction.