Considerations for the development of real-time dynamic testing using servo-hydraulic actuation

摘要

This 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 effective 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 influences 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 influences of the servo-hydraulic system that significantly affect the real-time dynamic tests can be properly compensated through control schemes identified in this paper.