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Structural Engineering and Mechanics Volume 63, Number 2, July25 2017 , pages 181-193 DOI: https://doi.org/10.12989/sem.2017.63.2.181 |
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Parameters identification of fractional models of viscoelastic dampers and fluids |
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Roman Lewandowski, Mieczyslaw Slowik and Maciej Przychodzki
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| Abstract | ||
| An identification method for determination of the parameters of the rheological models of dampers made of viscoelastic material is presented. The models have two, three or four parameters and the model equations of motion contain derivatives of the fractional order. The results of dynamical experiments are approximated using the trigonometric function in the first part of the procedure while the model parameters are determined as the solution to an appropriately defined optimization problem. The particle swarm optimization method is used to solve the optimization problem. The validity and effectiveness of the suggested identification method have been tested using artificial data and a set of real experimental data describing the dynamic behavior of damper and a fluid frequently used in dampers. The influence of a range of excitation frequencies used in experiments on results of identification is also discussed. | ||
| Key Words | ||
| viscoelastic dampers and fluids, fractional rheological models, identification of parameter | ||
| Address | ||
| Roman Lewandowski and Maciej Przychodzki : Institute of Structural Engineering, Poznan University of Technology, ul. Piotrowo 5, 60-965 Poznan, Poland Mieczyslaw Slowik : Institute of Civil Engineering, Poznan University of Technology, ul. Piotrowo 5, 60-965 Poznan, Poland | ||