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

ABSTRACT

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.

KEYWORDS:

• Real-time hybrid simulation
• servo-hydraulic dynamics
• generalized likelihood uncertainty estimation
• uncertainty analysis
• actuator tracking

Acknowledgments

The opinions and conclusions presented in this paper are those of the authors and do not necessarily reflect the views of the sponsoring organizations.

Additional information

Funding

The study has been partially supported by the Ministry of Science and Technology of the People’s Republic of China under Grant No. [2018YFE0206100].