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Free vibrations of non-uniform beams on a non-uniform Winkler foundation using the Laguerre collocation method

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Abstract

Natural frequencies and free vibration are important characteristics of beams with non-uniform cross section. Hence, the solution for free vibrations of non-uniform beams is presented using a Laguerre collocation method. The elastically restrained beam model is based on the Euler–Bernoulli theory. Also, the non-uniform beam is rested on a non-uniform foundation (Winkler type). The Laguerre collocation method is introduced for solving the differential equation. This approach reduces the governing differential equation to a system of algebraic equations, and finally, the problem is greatly simplified. Properties of Laguerre polynomials and the operational matrix of derivation are first presented. Eventually, the proposed method is applied for solving the governing differential equation subject to initial conditions, and the results are compared with other results from the literature.

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Author information

Authors and Affiliations

  1. Department of Civil Engineering, Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

    Amin Ghannadiasl

  2. Department of Mathematics, University of Mohaghegh Ardabili, Ardabil, Iran

    Ali Zamiri & Abdollah Borhanifar

Authors
  1. Amin Ghannadiasl
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  2. Ali Zamiri
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  3. Abdollah Borhanifar
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Correspondence to Amin Ghannadiasl.

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Technical Editor: José Roberto de França Arruda.

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Ghannadiasl, A., Zamiri, A. & Borhanifar, A. Free vibrations of non-uniform beams on a non-uniform Winkler foundation using the Laguerre collocation method. J Braz. Soc. Mech. Sci. Eng. 42, 242 (2020). https://doi.org/10.1007/s40430-020-02332-3

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