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arXiv 1701.05979math.NAcs.NA
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一种用于物理中非线性边值问题的小波积分置信法

A wavelet integral collocation method for nonlinear boundary value problems in Physics

Key Laboratory of Mechanics on Disaster and Environment in Western China, the Ministry of Education, College of Civil Engineering and Mechanics, Lanzhou University(西部灾害与环境力学教育部重点实验室,兰州大学土木工程与力学学院)

Lei Zhang, Jizeng Wang, Xiaojing Liu, Youhe Zhou

AI总结:

本文提出了一种高阶小波积分置信法,用于解决物理中的非线性边值问题,通过改进的Coiflet近似和边界扩展技术,证明了方法的收敛阶为N,且在多个物理非线性微分方程中表现出更高的精度和效率。

摘要:

本文开发了一种高阶小波积分置信法(WICM),用于解决物理中的通用非线性边值问题。该方法基于Coiflet对区间有界函数的多重积分近似,结合精确且可调节的边界扩展技术。证明了当采用具有N-1个消失矩的Coiflet时,该近似的收敛阶为N,其中N可以是任意正偶整数。在应用传统置信法之前,原微分方程被转换为其等价形式,通过将未知函数的导数表示为新函数,并建立低阶和高阶导数之间的关系。对于线性情况,误差分析证明所提出的WICM的阶为N,相关矩阵的条件数几乎与置信点数量无关。广泛物理非线性微分方程的数值示例表明,所提出的WICM的精度甚至大于N,并且最有趣的是,这种精度与要解决的微分方程的阶数无关。与现有数值方法的比较进一步证明了该方法的准确性和效率。

英文摘要:

A high order wavelet integral collocation method (WICM) is developed for general nonlinear boundary value problems in physics. This method is established based on Coiflet approximation of multiple integrals of interval bounded functions combined with an accurate and adjustable boundary extension technique. The convergence order of this approximation has been proven to be N as long as the Coiflet with N-1 vanishing moment is adopted, which can be any positive even integers. Before the conventional collocation method is applied to the general problems, the original differential equation is changed into its equivalent form by denoting derivatives of the unknown function as new functions and constructing relations between the low and high order derivatives. For the linear cases, error analysis has proven that the proposed WICM is order N, and condition numbers of relevant matrices are almost independent of the number of collocation points. Numerical examples of a wide range of nonlinear differential equations in physics demonstrate that accuracy of the proposed WICM is even greater than N, and most interestingly, such accuracy is independent of the order of the differential equation to be solved. Comparison to existing numerical methods further justifies the accuracy and efficiency of the proposed method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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