共查询到18条相似文献,搜索用时 93 毫秒
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本文研究了一个具有弱阻尼项和耦合源项的粘弹性波动方程组的初边值问题.首先,在一定的初边值条件下,应用位势井理论证明了解的整体存在.其次,在松弛函数满足一定的条件下,利用能量扰动的方法结合微分不等式技巧证明了解能量的一般衰减性结果. 相似文献
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研究带有阻尼项的非线性波动方程(1.1),得出在初值满足一定条件时,方程的整体解存在,且解的能量是指数衰减的. 相似文献
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通过运用扰动能量方法研究了一类具有弱非线性耗散项粘弹性波方程解的能量衰减性,其中耗散项显依赖于时间t,得到解的衰减率依赖于阻尼的增长速度和t的函数. 相似文献
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本文研究带有非线性阻尼项的广义Hartree方程的整体适定性:■其中d≥3,a>0,0<α0‖L2≤‖Q‖L2时,我们证明了解是整体存在的;当p=1+2+α/d且q=2+4/d时,我们发现阻尼项可以阻止解的爆破,并进一步研究了解的散射问题. 相似文献
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研究了三维空间中带非线性阻尼项的可压缩欧拉方程组的初值问题.利用能量估计和傅立叶分析的方法,在初值是常状态附近的一个H~3∩L~1中的小扰动时获得了初值问题的解整体存在,并得到了解在大时间的L~2,L~∞衰减率分别为t~(-3/4),t~(-3/2),将线性阻尼的情形推广到了非线性阻尼的情形. 相似文献
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考虑带有对数非线性源的p-Kirchhoff方程的初边值问题,此问题可用来描述热传播的过程和种群密度的演化.首先利用Galerkin方法,对数Sobolev不等式以及Gronwall不等式,再结合Lions引理,得到其局部解的存在性.同时引入修正泛函研究势井深度,结合势井理论,建立先验估计,得到解的整体存在性和衰减估计,推广和改进了已有结果. 相似文献
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一类具有非线性阻尼和源项的Petrovsky方程整体解的存在性与渐近性 总被引:1,自引:0,他引:1
研究了一类具有非线性阻尼和源项的Petrovsky方程u_(tt) △~2u au_t|u_t|~(m-2)= bu|u|~(p-2)的初边值问题.在对m,p的大小关系不加任何限制的情况下,利用稳定集证明了整体解的存在性,并且得到了整体解的渐近性质. 相似文献
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本文考虑了一类具有强阻尼和非线性阻尼项的波动方程:utt, - △u - ω△u1, +μ | u1|m-2 u1 =| u |p-2 u,其中P>2,m>2,w=μ1.利用变分法和紧性引理,本文证明了基态驻波解的存在性.并且得到了解的整体存在和爆破条件. 相似文献
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叶耀军 《高校应用数学学报(A辑)》2010,25(2)
研究了一类含有非线性阻尼项和源项的波动方程的初边值问题.证明了当初始能量E(0)满足0E(0)d(d为一正常数)时,问题的整体解的不存在性并给出了解的生命跨度估计. 相似文献
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我们考虑如下方程的整体解的存在性:uxt 3/2ux^2uxx Uxxxx-sinu εux=f我们先给出了一致性先验估计,然后在H0^1∩H^2空间证明了整体解的存在性. 相似文献
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In this paper,we consider the following viscoelastic equation u tt- △u +∫t 0 g(t-s)△u(s)ds + a(x)u t + u |u|r = 0 with initial condition and Dirichlet boundary condition.The decay property of the energy function closely depends on the properties of the relaxation function g(t) at infinity.In the previous works of [3,7,11],it was required that the relaxation function g(t) decay exponentially or polynomially as t → +∞.In the recent work of Messaoudi [12,13],it was shown that the energy decays at a similar rate of decay of the relaxation function,which is not necessarily dacaying in a polynomial or exponential fashion.Motivated by [12,13],under some assumptions on g(x),a(x) and r,and by introducing a new perturbed energy,we also prove the similar results for the above equation. 相似文献
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HAN Xiaosen 《偏微分方程(英文版)》2009,22(4):299-314
In this paper we investigate a nonlinear viscoelastic equation with nonlinear damping. Global existence of weak solutions and uniform decay of the energy have been established. The Faedo-Galerkin method and the perturbed energy method are employed to obtain the results. 相似文献
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In this paper we are concerned with a nonlinear viscoelastic equation with nonlinear damping. The general uniform decay of the energy is obtained. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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ShaoJiFENG DeXingFENG 《数学学报(英文版)》2004,20(6):1057-1072
For wave equations with variable coefficients on regions which are not necessarily smooth, we study the energy decay rate when a nonlinear damping is applied on a suitable subrigion. 相似文献
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We prove global pointwise decay estimates for a class of defocusing semilinear wave equations in n = 3 dimensions restricted to spherical symmetry. The technique is based on a conformal transformation and a suitable choice of the mapping adjusted to the nonlinearity. As a result we obtain a pointwise bound on the solutions for arbitrarily large Cauchy data, provided the solutions exist globally. The decay rates are identical with those for small data and hence seem to be optimal. A generalization beyond the spherical symmetry is suggested. 相似文献