指數(shù)型非粘滯阻尼模型參數(shù)識別的理論與試驗(yàn)研究
[Abstract]:Vibration problems are common in the fields of machinery, civil engineering and aviation. We not only care about the vibration itself, but also try to reduce the vibration by damping energy dissipation. Up to now, a lot of achievements have been made in the research of damping, but the research on the physical mechanism of damping is still quite backward. One of the most important reasons is that damping can not be described by a very exact physical quantity compared with mass and stiffness. Recently developed exponential non-viscous damping model is considered to be a more general damping model which fully considers the delay effect of damping force and is valuable for further study. In this paper, the damping matrix decomposition method is extended to the exponential non-viscous damping model to identify the damping coefficient matrix of the model, and the most effective BFGS (Broyden-Fletcher-Goldfarb-Shanno) method in the quasi-Newton method is used as the theoretical basis. A new iterative calculation method of relaxation factor is proposed. Finally, the validity of the new damping coefficient matrix identification method and relaxation factor iterative algorithm is verified by a shaking table test of a single-span and two-story steel frame with viscoelastic dampers. The main contents are as follows: considering the incompleteness of extracting modal parameters from actual field data, a new method of identifying damping coefficient matrix for exponential non-viscous damping model is developed on the basis of damping matrix decomposition method. This method can consider the element distribution of the exponential damping coefficient matrix and can accurately identify the damping coefficient matrix of the system by using the finite low-order measured modes. Considering that the research on relaxation factor of exponential non-viscous damping model at home and abroad is not sufficient for exponential proportional damping model, a new relaxation factor iteration algorithm is proposed by using BFGS method in quasi-Newton method. Finally, a shaking table test of a single-span and two-story steel frame model with a similar ratio of 1:4 and visco-elastic dampers is carried out, and the non-viscous parameters of the integral steel frame model are calculated and determined. The damping coefficient matrix and relaxation factor of the frame are identified by the damping coefficient matrix decomposition method and relaxation factor iterative algorithm proposed in this paper. The feasibility and correctness of the proposed identification method in practical application are further investigated.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TB535
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