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

JOURNAL OF DIFFERENTIAL EQUATIONS

卷:259

Article

Xu, Jiang¹  Mori, Naofumi²  Kawashima, Shuichi³ 

[1] Nanjing Univ Aeronaut & Astronaut, Dept Math, Nanjing 211106, Jiangsu, Peoples R China

[2] Kyushu Univ, Grad Sch Math, Fukuoka 8190395, Japan

[3] Kyushu Univ, Fac Math, Fukuoka 8190395, Japan

关键词: Global existence;    Minimal decay regularity;    Critical Besov spaces;    Timoshenko system;   

DOI  :  10.1016/j.jde.2015.06.041

来源: Elsevier

【 摘 要 】

As a continued work of 1181, 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 1181, 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. (C) 2015 Elsevier Inc. All rights reserved.

【 授权许可】

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