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Servo-hydraulic actuators are often used in real-time hybrid simulation to impose desired displacements to specimens and to maintain the boundary compatibility between substructures. Previous studies often consider the servo-hydraulic system as deterministic while experimental results indicate otherwise due to different sources of uncertainties. This study utilizes the generalized likelihood uncertainty estimation method to explore the uncertainties in servo-hydraulic dynamics. Probabilistic distribution and statistical moments are derived for parameters of a linearized servo-hydraulic model based on experimental results. The analysis results are further applied to demonstrate the effects of servo-hydraulic uncertainties on actuator tracking and compared with the corresponding deterministic model.

Probabilistic Analysis of a Linearized Servo-Hydraulic Model for Real-Time Structural Testing