Mixed Sensitivity-Based Robust H? Control Method for Real-Time Hybrid Simulation

Real-time hybrid simulation (RTHS), dividing the emulated structure into numerical substructures (NS) and physical (PS), is a powerful technique to obtain responses then assess seismic performance of civil engineering structures. A transfer system, servo-hydraulic actuator or shaking table, used apply boundary conditions between two substructures. However, inherently complex system with nonlinearities may introduce time delays RTHS, which will decrease accuracy stability RTHS. Moreover, there are various uncertainties in An accurate robust control strategy necessary guarantee reliable results. Therefore, mixed sensitivity-based H? method was proposed for In control, dynamics robustness closed-loop realized by weighting functions. form function given considering requirement The influence functions on investigated. Numerical simulations actual RTHSs were carried out under symmetric asymmetric dynamic loads, namely sinusoidal earthquake excitation, respectively. Results indicated that RTHS feasible, it exhibits an excellent tracking robustness.