Adaptive time series compensator for delay compensation of servo-hydraulic actuator systems for real-time hybrid simulation

2013 ◽  
Vol 42 (11) ◽  
pp. 1697-1715 ◽  
Author(s):  
Yunbyeong Chae ◽  
Karim Kazemibidokhti ◽  
James M. Ricles
Keyword(s):  
Time Series ◽  
Real Time ◽  
Hybrid Simulation ◽  
Hydraulic Actuator ◽  
Delay Compensation ◽  
Adaptive Time

Real-time force control for servo-hydraulic actuator systems using adaptive time series compensator and compliance springs

2017 ◽  
Vol 47 (4) ◽  
pp. 854-871 ◽  
Author(s):  
Yunbyeong Chae ◽  
Ramin Rabiee ◽  
Abdullah Dursun ◽  
Chul-Young Kim
Keyword(s):  
Time Series ◽  
Real Time ◽  
Force Control ◽  
Hydraulic Actuator ◽  
Adaptive Time

Parametric identification of a servo-hydraulic actuator for real-time hybrid simulation

2014 ◽  
Vol 48 (1-2) ◽  
pp. 260-273 ◽  
Author(s):  
Yili Qian ◽  
Ge Ou ◽  
Amin Maghareh ◽  
Shirley J. Dyke
Keyword(s):  
Real Time ◽  
Hybrid Simulation ◽  
Parametric Identification ◽  
Hydraulic Actuator

scholarly journals Kalman Filter-Based Adaptive Delay Compensation for Benchmark Problem in Real-Time Hybrid Simulation

2020 ◽  
Vol 10 (20) ◽  
pp. 7101
Author(s):  
Xizhan Ning ◽  
Zhen Wang ◽  
Bin Wu
Keyword(s):  
Kalman Filter ◽  
Time Delay ◽  
Real Time ◽  
Control Plant ◽  
Hybrid Simulation ◽  
Time Varying ◽  
Transfer System ◽  
Benchmark Problem ◽  
Delay Compensation ◽  
Comparison Results

Real-time hybrid simulation (RTHS) is a versatile, effective, and promising experimental method used to evaluate the structural performance under dynamic loads. In RTHS, the emulated structure is divided into a numerically simulated substructure (NS) and a physically tested substructure (PS), and a transfer system is used to ensure the force equilibrium and deformation compatibility between the substructures. Owing to the inherent dynamics of the PS and transfer system (referred to as a control plant in this study), there is a time-delay between the displacement command and measurement. This causes de-synchronization between the boundary of the PS and NS, and affects the stability and accuracy of the RTHS. In this study, a Kalman filter-based adaptive delay compensation (KF-ADC) method is proposed to address this issue. In this novel method, the control plant is represented by a discrete-time model, whose coefficients are time-varying and are estimated online by the KF using the displacement commands and measurements. Based on this time-varying model, the delay compensator is constructed employing the desired displacements. The KF performance is investigated theoretically and numerically. To assess the performance of the proposed strategy, a series of virtual RTHSs are performed on the Benchmark problem in RTHS, which was based on an actual experimental system. Meanwhile, several promising delay-compensation strategies are employed for comparison. Results reveal that the proposed time-delay compensation method effectively enhances the accuracy, stability, and robustness of RTHS.

scholarly journals Mixed Sensitivity-Based Robust H∞ Control Method for Real-Time Hybrid Simulation

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 840
Author(s):  
Xizhan Ning
Keyword(s):  
Real Time ◽  
Control Method ◽  
Weighting Function ◽  
Hybrid Simulation ◽  
Shaking Table ◽  
Transfer System ◽  
Hydraulic Actuator ◽  
Earthquake Excitation ◽  
Engineering Structures ◽  
Weighting Functions

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

Experimental Evaluation of an Adaptive Actuator Control Scheme for Real-Time Tests of Large-Scale Magneto-Rheological Damper Under Variable Current Inputs

2009 ◽  
Author(s):  
Cheng Chen ◽  
James M. Ricles
Keyword(s):  
Real Time ◽  
Hybrid Simulation ◽  
Mr Damper ◽  
Structural Systems ◽  
Adaptive Compensation ◽  
Hydraulic Actuator ◽  
Control Laws ◽  
Mr Dampers ◽  
Magneto Rheological ◽  
Actuator Control

A Magneto-Rheological (MR) fluid damper is a semi-active device for vibration control of engineering structures subjected to dynamic loading. The characteristics of MR dampers vary under different current inputs to achieve optimized vibration control of structural systems. Experimental evaluation of MR dampers under different control laws is necessary before the device can be accepted by the practical design community. Real-time hybrid simulation provides an economical and efficient dynamic testing technique by accounting for the damper rate-dependency and the damper-structure interaction. A successful real-time hybrid simulation requires accurate actuator control to achieve reliable experiment results. A servo-hydraulic actuator usually introduces a time delay due to servo-hydraulic dynamics. The variable current inputs induced by semi-active control laws would pose additional challenges for actuator control by introducing variable delay in a real-time hybrid simulation. In this paper an adaptive compensation technique is experimentally evaluated for real-time hybrid simulation involving an MR damper under variable current inputs. Predefined band-limited white noise is used as the displacement command for the servo-hydraulic actuator and current command for the MR damper. The adaptive compensation scheme is demonstrated to achieve accurate actuator control and therefore shows great potential for real-time hybrid simulation of structural systems with semi-active energy dissipation devices.

Testing Platform and Delay Compensation Methods for Distributed Real-Time Hybrid Simulation

2020 ◽  
Vol 44 (6) ◽  
pp. 787-805
Author(s):  
H. L. Sadraddin ◽  
M. Cinar ◽  
X. Shao ◽  
M. Ahmed
Keyword(s):  
Real Time ◽  
Hybrid Simulation ◽  
Delay Compensation ◽  
Testing Platform ◽  
Compensation Methods
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