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arXiv 1409.0955math.AP
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多速率系统的平衡黏性解

Balanced-Viscosity solutions for multi-rate systems

Alexander Mielke, Riccarda Rossi, Giuseppe Savaré

摘要:

几个机械系统的位移$u$耦合速率无关的流动规则的一些内部变量$z$的静态动量平衡建模。我们考虑一类具有相同结构的常微分方程的抽象系统,虽然在有限维的设置,并通过添加粘性耗散项系数$\varepsilon^α$和$\varepsilon$,其中$0<\varepsilon \ll 1$和$α>0$是一个固定的参数,规范的静态方程和速率无关的流动规则。因此,对于$α\neq 1$,$u$和$z$具有不同的弛豫速率。我们将消失粘度分析称为粘性系统的$\varepsilon \downarrow 0$。我们证明,到一个子序列,(重新参数化)粘性解决方案收敛到一个参数化曲线产生一个平衡的粘度解决方案,原来的速率无关的系统,并提供了一个准确的描述系统的行为跳跃。我们还给出了一个次微分包含系统的平衡粘度解的概念的重新表述,表明在$u$和$z$中的粘度以不同的方式参与跳跃动力学,根据是否$α>1$,$α=1$,和$α\in (0,1)$。

英文摘要:

Several mechanical systems are modeled by the static momentum balance for the displacement $u$ coupled with a rate-independent flow rule for some internal variable $z$. We consider a class of abstract systems of ODEs which have the same structure, albeit in a finite-dimensional setting, and regularize both the static equation and the rate-independent flow rule by adding viscous dissipation terms with coefficients $\varepsilon^α$ and $\varepsilon$, where $0<\varepsilon \ll 1$ and $α>0$ is a fixed parameter. Therefore for $α\neq 1$ $u$ and $z$ have different relaxation rates. We address the vanishing-viscosity analysis as $\varepsilon \downarrow 0$ of the viscous system. We prove that, up to a subsequence, (reparameterized) viscous solutions converge to a parameterized curve yielding a Balanced Viscosity solution to the original rate-independent system, and providing an accurate description of the system behavior at jumps. We also give a reformulation of the notion of Balanced Viscosity solution in terms of a system of subdifferential inclusions, showing that the viscosity in $u$ and the one in $z$ are involved in the jump dynamics in different ways, according to whether $α>1$, $α=1$, and $α\in (0,1)$.

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