一类二阶微分方程的振动准则

时间:2022-07-28 08:21:43

一类二阶微分方程的振动准则

摘 要:通过引入参数函数H(t,s)及h(t,s),利用积分平均技巧,积分变换和广义Riccati变换给出了一类二阶微分方程的振动准则。

关键词:振动性;微分方程;广义Riccati变换

中图分类号:O1758文献标识码:A

[WT]文章编号:1672-1098(2011)02-0061-05

收稿日期:2011-03-15

基金项目:安徽理工大学青年教师科学研究基金资助项目(2010)

作者简介:唐楠(1981-),女,河北邢台人,助教,硕士,主要从事微分方程定性与稳定性理论的教学和研究工作。

[JZ(〗[WT3BZ]Oscillation Criteria of A Class of Second Order Differential Equation

TANG Nan

(School of Mathematics, Anhui University of Science and Technology, Huainan Anhui 232001, China)

Abstract:By introducing H(t,s),h(t,s),using the iterated integral transformations and generalized Riccati transformation, some oscillation criteria of a class ofsecond order differential equation were given.

Key words:oscillation; differential equation; generalized Riccati transformation.

近年来,微分方程解的振动性问题引起了广泛关注。文献[1-4]分别讨论了二阶非线性方程解的振动性问题。目前二阶半线性微分方程已有较多研究成果[5-8],但对于具有特殊形式的二阶半线性微分方程的结果并不多见。

考虑二阶微分方程

引理1 如果A,B是非负数,那么Aλ+(λ-1)Bλ-λABλ-1≥0,λ>1,

等号成立当且仅当A=B[9]。

通过引入参数函数H(t,s)及h(t,s),下面给出式(1)的解振动的充分条件。

定理1 令D={(t,s)|t≥s≥t0},D0={(t, s)|t>s≥t0}; 若ddtg(t, a)存在, 并且存在函数H(t,s)∈C(D,R),h(t,s)∈C(D0,R+),满足以下条件

H(t,t)=0,t≥t0;H(t,s)s≤0;H(t,s)>0,(t,s)∈D0(2)

h(t,s)=-H(t,s)s,(t,s)∈D0(3)

参考文献:

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[5] HSU H B, YEH C C.Oscillation theorems for second order half-linear differential equations[J].Appl Math Lett, 1996, 9: 71-77.

[6] LI H J,YEH C C.Oscillations of half-linear second order differential equations[J].Hiroshima Math J,1995,25:585-594.

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