A two-stage online iteration time-delay compensation method for real time hybrid testing: simulation and test verification

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (17) : 31-38.

LI Ning1,2,3, ZHOU Chen1, ZHOU Zihao1, LI Zhongxian1,2,3

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Abstract

Real-time hybrid testing (RTHT) is one of important methods for evaluating structural aseismic performance. Published study results show that time delay of a hydraulic servo system generates a negative damping effect in RTHT to cause incorrect test results; time delay in tests is a time-varying parameter, it can’t be measured in advance; it is of great importance to compensate time delay for the RTHT control system. Here, firstly, the principle of two-stage time-delay compensation was introduced. Then, time-delay of a system was divided into no-load time-delay and load variable one, and the control method based on two-stage time-delay compensation was proposed. The real-time calculation method for system time-delay was designed. Finally, numerical simulation and RTHT for rigid components were conducted, respectively. Results showed that the proposed time delay compensation method has features of high accuracy and good robustness.

Key words

real-time hybrid testing / hydraulic servo system / time delay compensation / online iteration / accuracy

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LI Ning1,2,3, ZHOU Chen1, ZHOU Zihao1, LI Zhongxian1,2,3. A two-stage online iteration time-delay compensation method for real time hybrid testing: simulation and test verification[J]. Journal of Vibration and Shock, 2020, 39(17): 31-38

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