共查询到20条相似文献,搜索用时 125 毫秒
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讨论了中立型差分方程的非振动解.首先由非振动解的渐进性质把非振动解分成两类.其次分别给出存在这两类非振动解的充分条件.最后给出例子说明定理的应用. 相似文献
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张孟秋 《数学的实践与认识》1995,(1)
本文首先研究了具有正负号系数的线性中立型时超微分不等式解的振动性。获得了其解振动的判定准则,然后应用该准则研究了非线性中立型时超微分方程和n维非线性中立型时超微分方程组解的振动性。获得其解振动的充分条件。 相似文献
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证明了线性脉冲中立型时滞微分方程解的振动性等价于一类非脉冲中立型时滞微分方程解的振动性,应用这一结果建立了此类线性脉冲中立型微分方程解的振动性的显示判据。 相似文献
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《数学物理学报(A辑)》2017,(2)
该文考虑一类非线性延迟微分方程数值解的振动性.通过振动性的理论将这个非线性延迟微分方程的振动性转化为相应的线性延迟微分方程的振动性,再利用线性θ-方法的相关内容得到相应数值解的形式,从而得到数值解振动的条件以及非振动解的一些性质.为了更有力说明结果,最后给出了相应的算例. 相似文献
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研究一类具脉冲时滞的非线性双曲型向量泛函微分方程解的H-振动性.方法是采用由Domslak引进的H-振动性的概念,将向量微分方程解的振动问题转化为纯量微分不等式正解和负解的不存在性问题.得到了解的H-振动性的若干判别准则. 相似文献
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研究一类二阶中立型双曲偏泛函微分方程解的振动性质,获得了在齐次Dirichlet,Neumann和Robin边界条件下,解振动或非振动的充分条件. 相似文献
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Thomas Y. Hou 《纯数学与应用数学通讯》1988,41(4):471-495
The behavior of multi-dimensional discrete Boltzmann systems with highly oscillatory data is studied. Homogenized equations for the mean solutions are obtained. Uniform convergence of the oscillatory solutions of the discrete Boltzmann equations to the solutions of the corresponding homogenized equations is established. Moreover, we find that the weak limits of the oscillatory solutions for a model of Broadwell type are not continuous functions of the discrete velocities. Generalization of the above results to problems with multiple-scale initial data is also established. 相似文献
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This paper deals with the oscillatory properties of a class of nonlinear difference equations with several delays. Sufficient criteria in the form of infinite sum for the equations to be oscillatory are obtained. 相似文献
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一阶中立型泛函微分方程解的渐近性与振动性 总被引:3,自引:0,他引:3
本文研究具有变系数和多偏差的一阶中立型微分方程,讨论了方程的非振动解的渐近性,得到了方程振动的充分判据,其中有些是变号系数的情形. 相似文献
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A new numerical integration scheme for the simulation of differential–algebraic equations is presented. In the context of
the computer-aided design of electronic circuits, the modeling of highly oscillatory circuits leads to oscillatory differential–algebraic
equations mostly of index 1 or 2. Standard schemes can solve these equations neither efficiently nor reliably. The new discretiziation
scheme is constructed in such a way as to overcome the problems of classical numerical methods. It uses the Principle of Coherence
due to Hersch in combination with a multistep approach. A combined Maple and Fortran77 implementation of the presented integration
scheme reduces the simulation time for a quartz-controlled oscillator to about 2% compared with standard methods. Therefore,
it is a powerful tool for the design of highly oscillatory circuits.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
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电磁、声波散射问题的研究涉及一类数学物理问题, 此类问题具有深刻的理论价值和重要的应用背景, 亟待解决. 高振荡微分、积分方程是刻画这些问题的重要的数学模型, 其数值计算存在许多挑战性研究课题. 本文从积分方程解法角度出发, 综述了求解这类高振荡问题的一些最新进展, 特别是针对广义Fourier 变换、Bessel 变换的高效算法、高振荡核Volterra 积分方程的数值解法作了详细介绍. 这些数值方法共有特点是振荡频率越高算法精度愈高, 且可望为电磁计算的研究提供一些新的高效算法. 相似文献
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《Mathematical Methods in the Applied Sciences》2018,41(9):3246-3269
The purpose of this paper is to describe the oscillatory properties of second‐order Euler‐type half‐linear differential equations with perturbations in both terms. All but one perturbations in each term are considered to be given by finite sums of periodic continuous functions, while coefficients in the last perturbations are considered to be general continuous functions. Since the periodic behavior of the coefficients enables us to solve the oscillation and non‐oscillation of the considered equations, including the so‐called critical case, we determine the oscillatory properties of the equations with the last general perturbations. As the main result, we prove that the studied equations are conditionally oscillatory in the considered very general setting. The novelty of our results is illustrated by many examples, and we give concrete new corollaries as well. Note that the obtained results are new even in the case of linear equations. 相似文献