摘要
对于一类非线性四阶波动方程的初边值问题:其中Ω(?)R~n为边界充分光滑的有界区域。
研究了其整体弱解的存在性、唯一性、光滑性和爆破性质。所得的四个主要结果如下:
1、运用Galerkin方法结合势井理论构造稳定集证明了:
定理(存在性):设则问题(0.1)-(0.3)存在整体弱解u满足:
2、若p满足更强的条件时,运用能量方法结合不等式技巧证明了:
定理(唯一性):设则(0.1)-(0.3)的整体弱解是唯一的。
3、运用Galerkin方法、稳定集和不等式技巧证明了:
定理(光滑性):设则问题(0.1)-(0.3)存在唯一整体弱解
西南交通大学硕士研究生学位论文
第11页
,,满足:
。。L旬(o,T:H了(。)。万‘(。))
u,。犷(0 .T:H了(卿)
u,,任乙‘(0,了:L,(。))
4、运用凸性分析方法结合势井理论构造不稳定集证明了:
定理(.破):邵。。V,u,任LZ(。),E(o) 的局部解,则存在有限常数了,使得当l峥产时成立!。.2
厂(。)范数意义下在有限时刻发生blow一uP.
分二,即u在
For the initial-boundary value problem of a kind of nonlinear fourth-order wave equations:
where Rn is bounded domain with sufficiently smooth boundary.
What studied in this paper are the global existence, uniqueness, smoothness and blow-up of the weak solutions of (0.1) - (0.3). Our four main results are stated as follows:
1 By using the Galerkin method and constructing stable set
according to the potential well theory, It is proved:
Theorem (existence): Let
. Then problem (0.1)-(0.3) has global weak solutions u satisfying:
2 If p satisfies appropriately stronger condi tions, by using the energy method and the trick of inequality, It is proved:
Theorem (uniqueness): Let
. Then the global weak solution
of problem (0.1)-(0.3) is unique.
3 By using the Galerkin method, stable set and trick of inequality, It is proved:
Theorem (smoothness) : Let
. Then the problem (0.1)-(0.3) has unique global weak solution u satisfying:
4 By the convexity method and constructing unstable set according to the potential well theory, It is proved:
Theorem (blow up): Let u, u is the
local solution of problem (0.1) ?0.3), The there exists a finite constant T, such that. u blows up in f ini te
time under the L2() norm.
引文
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