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雙模耦合KdV方程的多孤子解與精確解

2019-10-28 02:19:11趙倩白喜瑞
華東師范大學學報(自然科學版) 2019年4期

趙倩 白喜瑞

摘要:根據簡化的Hirota雙線性方法和Cole-Hopf變換,當一個新的雙模耦合KdV方程中的非線性參數與耗散參數取特殊值時,得到了該新的雙模耦合KdV方程的多孤子解.同時,當方程中的非線性參數與耗散參數取一般值時,通過不同的函數展開法,如tanh/coth法和Jacobi橢圓函數法,可得到這個方程的其他精確解.

關鍵詞:雙模耦合KdV方程; 簡化的Hirota方法; 多孤子解;周期解

中圖分類號:0178

文獻標志碼:A

DOI: 10.3969/j.issn.1000-5641.2019.04.005

0 引言

一般來說,大多數非線性方程都是關于時間t的一階導數的方程,它們描述了單一方向的波.例如,KdV方程,Burgers方程等,這些模型均是沿x軸正向傳播的.而關于時間t的二階導數方程Boussinesq方程,它是沿x軸正向和負向兩個方向傳播的.

4 結論

在本文中,我們構造了一個新的雙模耦合KdV方程,一方面,通過簡化的Hirota方法和Cole-Hopf變換,對于特殊的α、β值可得到該方程的孤子解,但對于一般的α、β值,孤子解是否存在,我們還不能確定.另一方面,通過不同的函數展開法,對于一般的α、β值,我們得到了該方程的其他精確解.

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