Geodesic
A problem on longitudinal vibration of a bar with elastic fixing
Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, Tome 20 (2016) no. 2, pp. 249-258.

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In this paper, we study longitudinal vibration in a thick short bar fixed by point forces and springs. For mathematical model we consider a boundary value problem with dynamical boundary conditions for a forth order partial differential equation. The choice of this model depends on a necessity to take into account the result of a transverse strain. It was shown by Rayleigh that neglect of a transverse strain leads to an error. This is confirmed by modern nonlocal theory of vibration. We prove existence of orthogonal with load eigenfunctions and derive representation of them. Established properties of eigenfunctions make possible using the separation of variables method and finding a unique solution of the problem.
Keywords: dynamic boundary conditions, longitudinal vibration, loaded orthogonality, Rayleigh's model. 
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A. B. Beylin. A problem on longitudinal vibration of a bar with elastic fixing. Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, Tome 20 (2016) no. 2, pp. 249-258. http://geodesic.mathdoc.fr/item/VSGTU_2016_20_2_a3/

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