Nonlinear phenomena in the vibrations of a quartz tuning fork immersed in superfluid helium
Nonlinear phenomena in the vibrations of a quartz tuning fork immersed in superfluid helium
复制标题
浸入超流氦中的石英音叉振动的非线性现象
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
G. Sheshin
中科院分区：
文献类型：
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作者：
I. Gritsenko;T. A. Dubchak;K. A. Mykhailenko;S. Sokolov;G. Sheshin
实验涉及超流氦的流体动力学流的激发受到液体浸没的石英音叉的强迫振动进行。的非线性振动的调查中出现的驱动力的增加，并表现为在形状的谐振振幅-频率特性的失真，在一个非常小的力的洛伦兹曲线相比，进行。用Duffing方程描述了非线性共振曲线，通过理论计算与实验数据的比较找到了Duffing方程的参数。音叉腿的振动速度作为驱动力的函数，使用Duffing方程建立，是类似的依赖，是较早获得的准层流He II流，并包含一个立方速度的贡献所造成的相互摩擦由于声子散射在湍流中的量子化涡旋。
Experiments involving the excitation of hydrodynamic flows in superfluid helium subjected to forced vibrations of a liquid-immersed quartz tuning fork are conducted. An investigation of the nonlinear vibrations that arise with an increase in the driving force and are manifested by the distortion in the shape of the resonant amplitude-frequency characteristic, in comparison to the Lorentz curves for an extremely small force, is carried out. The nonlinear resonance curves are described using the Duffing equation, the parameters of which are found by comparing the theoretical calculations against the experimental data. The vibration velocity of the tuning fork legs as a function of the driving force, established using the Duffing equation, is similar to the dependence that was obtained earlier for the quasi-laminar He II flow and contains a cubic velocity contribution caused by the mutual friction due to phonon scattering on the quantized vortices in a turbulent flow.