A Wronskian method for elastic waves propagating along a tube

Author:

Chapman C. J.1ORCID,Sorokin S. V.2

Affiliation:

1. Department of Mathematics, University of Keele, Staffordshire ST5 5BG, UK

2. Faculty of Engineering and Science, Aalborg University, Fibigerstraede 16, 9220 Aalborg, Denmark

Abstract

A technique involving the higher Wronskians of a differential equation is presented for analysing the dispersion relation in a class of wave propagation problems. The technique shows that the complicated transcendental-function expressions which occur in series expansions of the dispersion function can, remarkably, be simplified to low-order polynomials exactly, with explicit coefficients which we determine. Hence simple but high-order expansions exist which apply beyond the frequency and wavenumber range of widely used approximations based on kinematic hypotheses. The new expansions are hypothesis-free, in that they are derived rigorously from the governing equations, without approximation. Full details are presented for axisymmetric elastic waves propagating along a tube, for which stretching and bending waves are coupled. New approximate dispersion relations are obtained, and their high accuracy confirmed by comparison with the results of numerical computations. The weak coupling limit is given particular attention, and shown to have a wide range of validity, extending well into the range of strong coupling.

Funder

Engineering and Physical Sciences Research Council

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

Reference24 articles.

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1. Reconfigurable Elastic Metamaterials: Engineering Dispersion with Beyond Nearest Neighbors;Physical Review Applied;2023-04-21

2. A Poisson scaling approach to backward wave propagation in a tube;Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences;2022-07-18

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