Force correction iterative hybrid test method considering physical loading time delay
WANG Tao1, HAO Jiedun1, MENG Liyan1, ZHENG Huan1, GONG Yuefeng1, WANG Zhen2, XU Guoshan3
1.School of Civil Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China;
2.School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, China;
3.School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China
Abstract:In order to improve the convergence efficiency of the traditional iterative hybrid test (IHT) , a force corrected iterative hybrid tests method considering physical loading time delay (PLTD-FCIHT) is proposed. In this method, the two parts of the numerical substructure (NS) and the experimental substructure (ES) are exchanged for the whole time history data, including the inner loop control of calculation and loading in the time history and the iterative convergence control of the outer loop in the time history. In the inner loop of the time history, the force correction strategy is used to correct the ES reaction force in the numerical integration of the equation of motion. At the same time, the third-order polynomial extrapolation method is used to compensate the time delay of the physical loading displacement command. Combined with the fixed-point iteration in the time history outer loop, an outer loop iterative convergence controller is established to reduce the displacement response error between two adjacent rounds. Taking the three-layer frames viscous damper shock absorption structure as an example, the force correction strategy is verified by numerical simulation, and the influence of the loading time delay on the iterative convergence is further analyzed. The results show that the force correction strategy can effectively improve the iterative convergence efficiency, and the higher the ES reaction force correction accuracy is, the higher the convergence efficiency is; the physical loading delay has a significant impact on the iterative convergence, and the delay compensation can effectively improve the iterative convergence.
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