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arXiv 2212.09441cond-mat.stat-mech
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通过周期性施力向半无限 $β$-Fermi-Pasta-Ulam-Tsingou 链供能

Energy supply into a semi-infinite $β$-Fermi-Pasta-Ulam-Tsingou chain by periodic force loading

Sergei D. Liazhkov

AI总结:

本文研究一端自由并受正弦周期力作用的半无限 $β$-FPUT 链,利用速度场闭式解与重整化色散关系刻画谐波及弱非谐波情形下的长时间能量输入规律。

摘要:

我们研究具有一个自由端、并承受正弦周期力的 $β$-Fermi-Pasta-Ulam-Tsingou 链的动力学。我们考察在长时间尺度下所输入总能量的演化。在谐波情形($β=0$)下,当对应于激励频率的群速度非零时,能量随时间线性增长;而在零群速度时,能量随时间按 $\sqrt{t}$ 增长。通过分析所得到的粒子速度场近似闭式表达式,我们对能量的时间行为提出了解释。在弱非谐波情形下,利用重整化色散关系得到了总能量的长时间渐近近似。借助该近似,我们分析了处于谐波链通带和阻带内的驱动频率下的能量传递。文中还讨论了渐近估计与数值模拟结果的一致性。

英文摘要:

We deal with dynamics of the~$β$-Fermi-Pasta-Ulam-Tsingou chain with one free end, subjected to the sinusoidal periodic force. We examine evolution of the total energy, supplied at large times. In the harmonic case~($β=0$), the energy grows in time linearly at non-zero group velocities, corresponding to the excitation frequency and grows in time as~$\sqrt{t}$ at zero group velocity. Explanation of behavior in time of the energy is proposed by analysis of obtained approximate closed-form expression for the field of particle velocities. In the weak anharmonic case, large-time asymptotic approximation for the total energy is obtained by using the renormalized dispersion relation. Operating of the approximation, we analyze energy transfer at the driving frequencies, lying both in the pass-band and in the stop-band of the harmonic chain. Consistency of the asymptotic assesses with the results of numerical simulations is discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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