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双模耦合KdV方程的多孤子解与精确解

来源:用户上传      作者:赵倩 白喜瑞

  摘要:根據简化的Hirota双线性方法和Cole-Hopf变换,当一个新的双模耦合KdV方程中的非线性参数与耗散参数取特殊值时,得到了该新的双模耦合KdV方程的多孤子解.同时,当方程中的非线性参数与耗散参数取一般值时,通过不同的函数展开法,如tanh/coth法和Jacobi椭圆函数法,可得到这个方程的其他精确解.
  关键词:双模耦合KdV方程; 简化的Hirota方法; 多孤子解;周期解
  中图分类号:0178
  文献标志码:A
  DOI: 10.3969/j.issn.1000-5641.2019.04.005
  0 引言
  一般来说,大多数非线性方程都是关于时间t的一阶导数的方程,它们描述了单一方向的波.例如,KdV方程,Burgers方程等,这些模型均是沿x轴正向传播的.而关于时间t的二阶导数方程Boussinesq方程,它是沿x轴正向和负向两个方向传播的.
  4 结论
  在本文中,我们构造了一个新的双模耦合KdV方程,一方面,通过简化的Hirota方法和Cole-Hopf变换,对于特殊的α、β值可得到该方程的孤子解,但对于一般的α、β值,孤子解是否存在,我们还不能确定.另一方面,通过不同的函数展开法,对于一般的α、β值,我们得到了该方程的其他精确解.
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