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SUMMARYThis paper presents a study of the use of servo-hydraulic systems in the implementation of real-time large-scale structural testing methods in force control such as e ective force testing (EFT) and in displacement control such as real-time pseudodynamic testing (RPsD). Mathematical models for both types of control systems are presented and used to investigate the in uences of servo-systems on the overall system performance. Parameters investigated include the overall system dynamics, nonlinearities of servo-systems, actuator damping, system mass including piston mass, and system response delay. Results of both numerical simulations and experiments showed that many of the in uences of the servo-hydraulic system that signiÿcantly a ect the real-time dynamic tests can be properly compensated through control schemes identiÿed in this paper.

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