共查询到20条相似文献,搜索用时 125 毫秒
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研制了一种简易的课堂使用的演示仪,通过数值模拟研究了复摆的运动特性,理论和演示实验的结果相互吻合.该演示仪可以演示平行轴定理和复摆的运动特性. 相似文献
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本文简要介绍了特斯拉线圈及其工作原理,并制作了一套简易、安全的小型特斯拉线圈演示仪.利用该演示仪可表演一系列有趣的实验,通过观察实验现象发现问题、提出问题,进一步地分析与探究. 相似文献
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利用磁铁能在磁性画板上留下轨迹的特点,制作了曲线运动演示仪,该演示仪能够直观地演示曲线运动的速度方向和运动规律,该装置操作简单、效果明显. 相似文献
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高温超导磁悬浮飞轮储能系统样机 总被引:1,自引:0,他引:1
在日益严峻的能源问题背景下,为展示无源高温超导磁悬浮技术在能量储存领域的应用前景,我们设计制作了一台全高温超导磁悬浮形式的飞轮储能样机.样机主要由高温超导磁悬浮轴承、飞轮转子、永磁电机和电路控制及负载部分组成.上下两个轴向型高温超导磁悬浮轴承用于悬浮和稳定飞轮转轴,直径200mm重量1.4kg的飞轮转子作为储能载体,最高可实现13000r/min的转速.在演示运行中,采用灯泡作为负载,该样机完成了从电能→机械能→电能的相互转换. 相似文献
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高温超导体因其无源自稳定的特性,受到许多学者的重视,具有广阔的应用前景.目前针对高温超导块材悬浮性能的研究主要集中于由永磁体产生的低磁场环境.本文基于超导磁体平台提供的强磁场环境,通过改变高温超导块材不同的场冷高度,实验研究了高温超导块材悬浮力与垂向磁场变化量的关系.研究结果表明随着垂向磁场变化量的增加,高温超导块材的悬浮力增长趋缓,并最终出现悬浮力饱和的现象.本文还对比了YBCO 和Gd-BCO 两种不同材料超导块材的悬浮性能,结果发现GdBCO 的悬浮力在强磁场环境中表现出更大的潜力.这为高温超导磁浮在强磁场中的应用奠定了基础,通过更加合理地调节磁场的分布,可以更好地发挥高温超导块材的悬浮性能潜力 相似文献
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In the present High Temperature Superconducting (HTS) maglev vehicle system, the air gaps between the adjacent permanent magnets make the magnetic fields above the NdFeB guideway non-uniform. So it is required to study the characteristics of levitation force of the HTS bulk affected by the non-uniform applied magnetic fields along the moving direction. In this paper, we have studied the characteristics of the levitation force relaxation by an experiment in which AC magnetic field generated by an electromagnet is used to simulate the time-varying magnetic field caused by the inhomogeneity of the NdFeB guideway. From the experiment results, it is found that the levitation force is attenuated with the application of the AC field, and the attenuation is increased with the amplitude of the AC field, but the attenuation is almost independent of the frequency the AC magnetic field. 相似文献
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Qiong-Gui Lin 《The European Physical Journal B - Condensed Matter and Complex Systems》2006,54(1):27-36
The interaction between a general magnetic source and a
long type-II superconducting cylinder in the Meissner or mixed state
is studied within the London theory. We first study the Meissner
state and solve the Maxwell–London equations when the source is a
magnetic monopole located at an arbitrary position. Then the field
and supercurrent for a more complicated magnetic charge distribution
can be obtained by superposition. A magnetic point dipole with
arbitrary direction is studied in detail. It turns out that the
levitation force on the dipole contains in general an angular as well
as a radial component. By integration we obtain the field and
supercurrent when the source is a two-dimensional monopole (a
magnetically charged long thread along the axial direction), from
which the results for a two-dimensional point dipole easily follow.
In the latter case the levitation force points in the radial
direction regardless of the orientation of the dipole. The case for a
current carrying long straight wire parallel to the cylindrical axis
is solved separately. The limit of ideal Meissner state is discussed
in most cases. The case of mixed state is discussed briefly. It turns
out that vortex lines along the axial direction and vortex rings
concentric with the cylinder have no effect outside the cylinder and
the levitation forces remain the same as in the case of the Meissner
state. 相似文献