共查询到19条相似文献,搜索用时 125 毫秒
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弹簧振子运动周期公式的研究及学生实验的开设李德洪(四川省邮电学校610067)在简谐振动的理论教学中,教材以弹簧振子为例.在简要地介绍了弹簧振子的运动情况后,对弹簧振子运动的周期定量的给出了公式和简要地论述了周期与质量、倔强系数、振幅等物理量的关系.... 相似文献
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弹簧振子的运动问题中,悬挂点(或支点)也在振动的问题或类似的问题,在有的物理教材中作为讲述两个同方向简谐振动合成前的引例,给人的印象是这类问题中振子的绝对运动是通过悬挂点的运动和弹簧振子相对悬挂点的运动两者叠加求解的.如果悬挂点的运动和弹簧振子相对悬挂点的运动都是简谐振动,则求解弹簧振子的绝对运动就是两个同方向简谐振动的合成问题. 相似文献
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利用T r a c k e r视频软件的自动追踪功能, 有效地跟踪油浸弹簧振子的阻尼振动, 实时描绘出振动的位
移 时间图像, 利用软件自带的功能拟合出振动曲线方程, 计算出该弹簧振子的阻尼系数, 并通过转换坐标得到运动
的相图 相似文献
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从力、运动、能量三个角度,证明竖直方向上的弹簧振子和基本弹簧振子模型的等效性;举例说明把竖直方向的弹簧振子可等效为基本模型,在列方程式求解未知量时更简洁方便. 相似文献
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本文讨论了有质量弹簧的弹簧振子的动力学,运用哈密顿函数解出了振子的运动方程,并推导出振动周期与弹簧质量和阻尼的关系. 相似文献
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在命制弹簧振子类试题设计数据时不能想当然,要根据动力学方程得出物体的运动规律,然后恰当的设计数据.结合具体的两个案例,分别给出单弹簧振子和双弹簧振子类试题数据是否自洽的论证方法. 相似文献
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G. Djuidjé Kenmoé A. Kenfack Jiotsa T. C. Kofané 《The European Physical Journal B - Condensed Matter and Complex Systems》2009,70(3):353-361
Frictional stick-slip dynamics is discussed using a model of one oscillator pulled by a nonlinear spring force. We focus our
attention on the nonlinear spring parameter k0. The dynamics of the model is carefully studied, both numerically and analytically. Our numerical investigation, which involves
bifurcation diagrams, shows a rich spectrum of dynamical behavior including periodic, quasi-periodic and chaotic states. On
the other hand, and for a good selection of parameters , the motion of the particle involves periodic stick-slip, erratic
and intermittent motions, characterized by force fluctuations, and sliding. This study suggests that the transition between
each of motion strongly depends on the nonlinear parameter k0. The system also displays resonance at fractional frequencies of the oscillator. 相似文献
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Asymptotic behavior of the solution of the moving oscillator problem is examined for large and small values of the spring stiffness for the general case of non-zero beam initial conditions. In the limiting case of infinite spring stiffness, it is shown that the moving oscillator problem for a simply supported beam is not equivalent, in a strict sense, to the moving mass problem. The two problems are shown to be equivalent in terms of the beam displacements but are not equivalent in terms of stresses (the higher order derivatives of the two solutions differ). In the general case, the force acting on the beam from the oscillator is shown to contain a high-frequency component , which does not vanish and can even grow when the spring coefficient tends to infinity. The magnitude of this force and its dependence on the oscillator parameters can be estimated by considering the asymptotics of the solution for the initial stage of the oscillator motion. It is shown that, for the case of a simply supported beam, the magnitude of the high-frequency force depends linearly on the oscillator eigenfrequency and velocity. The deficiency of the moving mass model is principally that it fails to predict stresses in the supporting structure. For small values of the spring stiffness, the moving oscillator problem is shown to be equivalent to the moving force problem. The discussion is amply illustrated by results of numerical experiments. 相似文献
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It is well known that the power absorbed by a linear oscillator when excited by white noise base acceleration depends only on the mass of the oscillator and the spectral density of the base motion. This places an upper bound on the energy that can be harvested from a linear oscillator under broadband excitation, regardless of the stiffness of the system or the damping factor. It is shown here that the same result applies to any multi-degree-of-freedom nonlinear system that is subjected to white noise base acceleration: for a given spectral density of base motion the total power absorbed is proportional to the total mass of the system. The only restriction to this result is that the internal forces are assumed to be a function of the instantaneous value of the state vector. The result is derived analytically by several different approaches, and numerical results are presented for an example two-degree-of-freedom-system with various combinations of linear and nonlinear damping and stiffness. 相似文献
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运用跃变旋转矢量法,即通过旋转矢量的起点、长度和相位的变化规律对受到空气弱阻尼作用和滑动摩擦力作用的弹簧振子的振动进行了研究.讨论了在滑动摩擦力作用下空气阻尼为临界阻尼和欠阻尼情况下的弹簧振子的运动,根据阻尼和初值情况得出不同的振动曲线.并对弹簧振子4种相图和相图旋转矢量进行了比较. 相似文献
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讨论了分数阶Frenkel-Kontorova模型的物理意义, 并应用该模型刻画了耦合粒子链在记忆性介质中的输运现象, 研究了各参数对粒子链运动状态的影响. 数值仿真结果表明: 系统的记忆性对粒子链的运动有显著影响, 尤其出现了在非记忆性情况下所不具有的反向流. 同时发现粒子链的平均流速会随耦合强度、分数阶的阶数变化而产生广义共振; 此外, 平均流速还会随噪声强度的变化出现广义随机共振现象.
关键词:
分数阶Frenkel-Kontorova模型
记忆性介质
随机共振
定向输运反向流 相似文献
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