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谱Legendre·Galerkin方法求解线性积分微分方程的超几何收敛性分析

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摘要采用谱legendre-galerkin方法求解第二类Volterra积分微分方程.当核函数k(x,s)=k(x-s)和源函数充分光滑且满足M-条件时,证明了问题的解u必定也满足M-条件.在此基础上,进一步证明了谱Legendre-Galerkin方法求解第二类Volterra积分微分方程时在L2和L∞意义下的超几何收敛性.而且数值结果很好地反映了理论预期.

关键词Volterra积分微分方程;谱Legendre-Galerkin;超几何收敛性;M-条件

中图分类号O2418文献标识码A文章编号1000-2537(2013)02-0001-07

Volterra积分微分方程广泛应用于物理、生物、控制论等自然科学领域.该类方程中的积分项反映了实际过程中的记忆或反馈性质,使得它与传统的微分方程有着本质的区别.如何快速、高效而准确地求解这类问题是科学计算中的重要问题.

早期关于积分微分方程的数值方法主要是差分方法[1].近年来,Hesthven[2],Tang[3-4], Guo[5]和Wang[6]等在用谱方法求解积分微分方程方面做了大量的工作,使得这方面研究逐渐引起了学者们的关注.事实上,谱方法具有“无穷阶”的收敛性,即如果原方程解无限光滑,那么适当的谱方法求得的近似解将以N-1的任意幂次速度收敛于精确解.特别是谱方法适合于求解非常规则而几何区域维数非常大的问题.

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