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Smart Structures and Systems Volume 36, Number 1, July 2025 , pages 39-50 DOI: https://doi.org/10.12989/sss.2025.36.1.039 |
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Adaptive time-delay compensation method combined with sliding mode control: Theory and verification |
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Yunhai Zeng, Huimeng Zhou, Yucai Chen, Yu Guo, Ping Tan and Zhen Wang
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| Abstract | ||
| Delay compensation presents a key component to ensure an accurate and robust real-time hybrid test (RTHT). As RTHT continues to evolve, the scale and degrees of freedom of studied structures increase, requiring greater attention to the responses of higher-order modes. High-frequency components in structural responses at the boundaries of substructures must also be accurately imposed onto the specimen. Robust delay compensation for high-frequency signals loading in RTHT needs to be explored. This paper proposes an adaptive time delay compensation based discrete model strategy combined with sliding mode control method (ADM-SMC). In this method, combining with the robust sliding mode control (SMC), the least squares method is used to update the parameters of the discrete model of the SMC-loading system in real time, which provides a robust compensation method for the wide-band and high-frequency excitation loading. A delay compensation test and a RTHT were conducted to verify the feasibility of this method. The results indicate that the proposed method can compensate varying time delay precisely with robustness for different high-frequency excitation loading. | ||
| Key Words | ||
| adaptive delay compensation; high-frequency signal; real-time hybrid testing; sliding mode control | ||
| Address | ||
| (1) Yunhai Zeng, Yucai Chen, Ping Tan: School of Civil Engineering and Transportation, Guangzhou University, Guangzhou 510006, China; (2) Huimeng Zhou: Earthquake Engineering Research & Test Center, Guangzhou University, Guangzhou 510006, China; (3) Yu Guo, Zhen Wang: School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China. | ||