Parameter determination and response analysis of viscoelastic material |
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Authors: | Yajuan Guo Guang Meng Hongguang Li |
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Institution: | (1) State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai, 200240, China |
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Abstract: | The parameter determination of viscoelastic material is a multi-variable, multi-aim nonlinear optimization problem, which
made the optimization process very complicated. In this paper a hybrid optimal algorithm was proposed to determine the viscoelastic
parameters in the constitutive relation according to the experimentally obtained mechanical properties. This algorithm merges
the Broydon–Fletcher–Goldfarb–Shanno search into a genetic algorithm framework as a basic operator in order to enhance the
local search capability. The proposed hybrid algorithm not only can reduce the iterative times greatly but can abolish the
limitation of initial parameter values. Nonlinear material characteristic curve-fitting was carried out using the proposed
algorithm and other existing approaches. And the comparison results show this algorithm is accurate and effective. The numerical
simulation and experimental study of viscoelastic cantilever beam also indicates that the finite element formulation and the
calculative viscoelastic model parameters are reliable. The proposed optimization method can be extended to further complex
parameter estimation researches. |
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Keywords: | Hybrid GA-BFGS algorithm Viscoelastic material Parameter determination Finite element method |
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