Global existence and minimal decay regularity for the Timoshenko system: The case of non-equal wave speeds

Global existence and minimal decay regularity for the Timoshenko system: The case of non-equal wave speeds
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Timoshenko 系统的全局存在性和最小衰减规律:不等波速的情况

DOI:
10.1016/j.jde.2015.06.041
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发表时间:
2015-03
影响因子:
2.4
通讯作者:
Kawashima Shuichi
Kawashima Shuichi
中科院分区:
数学2区
文献类型:
--
作者:
Xu Jiang;Mori Naofumi;Kawashima Shuichi

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作为[18]的继续工作,我们关注非等波速情况下的Timoshenko系统,它承认规律性损失的耗散结构。首先,通过对[18]中先验估计的修改,我们构建了与Besov空间中的数据有关的Timoshenko系统的全局解,其正则性为s= 3/2。由于耗散机制较弱,通常需要比全局时间存在性更高的正则性来获得经典解的最优衰减率,因此在临界空间中获得最优衰减率几乎是不可能的。为了克服这个突出的困难,我们开发了一种新的频率定位时间衰减不等式,它捕获了与高频部分可积性相关的信息。此外,通过高频和低频分解的能量方法,我们展示了临界Besov空间中Timoshenko系统的最优衰减率,这极大地改进了先前的工作。
As a continued work of [18], we are concerned with the Timoshenko system in the case of non-equal wave speeds, which admits the dissipative structure of regularity-loss. Firstly, with the modification of a priori estimates in [18], we construct global solutions to the Timoshenko system pertaining to data in the Besov space with the regularity s= 3/2. Owing to the weaker dissipative mechanism, extra higher regularity than that for the global-in-time existence is usually imposed to obtain the optimal decay rates of classical solutions, so it is almost impossible to obtain the optimal decay rates in the critical space. To overcome the outstanding difficulty, we develop a new frequency-localization time-decay inequality, which captures the information related to the integrability at the high-frequency part. Furthermore, by the energy approach in terms of high-frequency and low-frequency decomposition, we show the optimal decay rate for Timoshenko system in critical Besov spaces, which improves previous works greatly.
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