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arXiv 1502.02894math-phmath.MP
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弹性波Camassa-Holm方程的推导

Derivation of the Camassa-Holm equations for elastic waves

H. A. Erbay, S. Erbay, A. Erkip

摘要:

在本文中,我们提供了一个正式的推导Camassa-Holm方程和分数Camassa-Holm方程的传播的小,但有限振幅的长波在非局部和非线性弹性介质。我们首先表明,运动方程的非局部和非线性弹性介质减少到改进的Boussinesq方程的核函数出现在积分型本构关系的特定选择。然后,我们推导出Camassa-Holm方程的改进Boussinesq方程使用的渐近展开有效的非线性和色散参数独立地趋于零。我们的方法主要遵循文献中广泛使用的标准技术来推导浅水波的Camassa-Holm方程。还考虑了核函数的傅里叶变换具有分数阶幂的情况,并利用渐近展开技术导出了分数阶Camassa-Holm方程。

英文摘要:

In this paper we provide a formal derivation of both the Camassa-Holm equation and the fractional Camassa-Holm equation for the propagation of small-but-finite amplitude long waves in a nonlocally and nonlinearly elastic medium. We first show that the equation of motion for the nonlocally and nonlinearly elastic medium reduces to the improved Boussinesq equation for a particular choice of the kernel function appearing in the integral-type constitutive relation. We then derive the Camassa-Holm equation from the improved Boussinesq equation using an asymptotic expansion valid as nonlinearity and dispersion parameters tend to zero independently. Our approach follows mainly the standard techniques used widely in the literature to derive the Camassa-Holm equation for shallow water waves. The case where the Fourier transform of the kernel function has fractional powers is also considered and the fractional Camassa-Holm equation is derived using the asymptotic expansion technique.

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