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arXiv 2109.01562math.APmath.OC
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速率无关系统的惯性平衡粘度和惯性虚黏性解概念

The notions of Inertial Balanced Viscosity and Inertial Virtual Viscosity solution for rate-independent systems

Filippo Riva, Giovanni Scilla, Francesco Solombrino

摘要:

引入了速率无关演化过程的惯性平衡粘度(IBV)解概念。这种解决方案的特征在于能量平衡,其中在跳跃时间优化合适的、速率相关的耗散成本。这个代价使人想起小惯性项的极限效应。因此,这一概念被证明是一个合适的描述率无关耗散的力学系统的演化在极限的惯性和粘性的渐近行为。在有限维情形下,证明了这些演化收敛于IBV解。如果粘性算子被忽略,或有一个非平凡的核,惯性虚粘性(IVV)解的较弱的概念被引入,类似的收敛性结果成立。再次在有限维的情况下,它也表明,IBV和IVV的解决方案,可以通过自然扩张的最小化运动算法,其中考虑到惯性项的限制效果。

英文摘要:

The notion of Inertial Balanced Viscosity (IBV) solution to rate-independent evolutionary processes is introduced. Such solutions are characterized by an energy balance where a suitable, rate-dependent, dissipation cost is optimized at jump times. The cost is reminiscent of the limit effect of small inertial terms. Therefore, this notion proves to be a suitable one to describe the asymptotic behavior of evolutions of mechanical systems with rate-independent dissipation in the limit of vanishing inertia and viscosity. It is indeed proved, in finite dimension, that these evolutions converge to IBV solutions. If the viscosity operator is neglected, or has a nontrivial kernel, the weaker notion of Inertial Virtual Viscosity (IVV) solutions is introduced, and the analogous convergence result holds. Again in a finite-dimensional context, it is also shown that IBV and IVV solutions can be obtained via a natural extension of the Minimizing Movements algorithm, where the limit effect of inertial terms is taken into account.

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