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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

        趙倩 白喜瑞

        摘要:根據(jù)簡(jiǎn)化的Hirota雙線性方法和Cole-Hopf變換,當(dāng)一個(gè)新的雙模耦合KdV方程中的非線性參數(shù)與耗散參數(shù)取特殊值時(shí),得到了該新的雙模耦合KdV方程的多孤子解.同時(shí),當(dāng)方程中的非線性參數(shù)與耗散參數(shù)取一般值時(shí),通過不同的函數(shù)展開法,如tanh/coth法和Jacobi橢圓函數(shù)法,可得到這個(gè)方程的其他精確解.

        關(guān)鍵詞:雙模耦合KdV方程; 簡(jiǎn)化的Hirota方法; 多孤子解;周期解

        中圖分類號(hào):0178

        文獻(xiàn)標(biāo)志碼:A

        DOI: 10.3969/j.issn.1000-5641.2019.04.005

        0 引言

        一般來說,大多數(shù)非線性方程都是關(guān)于時(shí)間t的一階導(dǎo)數(shù)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(guān)于時(shí)間t的二階導(dǎo)數(shù)方程Boussinesq方程,它是沿x軸正向和負(fù)向兩個(gè)方向傳播的.

        4 結(jié)論

        在本文中,我們構(gòu)造了一個(gè)新的雙模耦合KdV方程,一方面,通過簡(jiǎn)化的Hirota方法和Cole-Hopf變換,對(duì)于特殊的α、β值可得到該方程的孤子解,但對(duì)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(shù)展開法,對(duì)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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