共查询到18条相似文献,搜索用时 312 毫秒
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目的研究电磁成形放电频率对板料变形的影响规律。方法以商用有限元软件ANSYS为平台,建立板料电磁成形有限元模型。通过数值模拟方法,研究不同厚度的1040铝合金板在不同放电频率下的变形过程,得到不同板厚对应的最优放电频率。对比板料自由胀形试验结果,验证数值模拟的可靠性。结果放电频率对线圈放电电流、板料内电流分布、磁场力分布以及变形影响较大,并且存在最优放电频率使得板料的变形量最大。结论最优相对放电频率随着板厚的增加而减小,其变化规律呈幂指数函数变化。 相似文献
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为研究改变交替阻抗微带线射频线圈的几何尺寸对感兴趣区内磁场分布的影响,保持微带线射频线圈总长度不变,改变宽带与窄带的长度比例和宽度比例,在HFSS中建立交替阻抗微带线射频线圈的仿真模型,与传统微带线射频线圈进行比较,利用ADS与HFSS的协同仿真实现线圈的调谐和匹配.仿真结果表明交替阻抗微带线射频线圈感兴趣区内的磁场均值比传统微带线射频线圈的提高了一倍以上.调整交替阻抗微带线射频线圈的宽带与窄带的长度比例和宽度比例,可以提高感兴趣区内的磁场强度,同时改善磁场分布的均匀性. 相似文献
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目的 为了解决传统大型蒙皮成形需要大型装备及零件回弹大的问题,提出带弹性垫的蒙皮件电磁渐进成形新方法.方法 通过电磁线圈放电,材料在磁压力和弹性垫的反弹力作用下出现高速振动,消除零件回弹.采用ANSYS和ABAQUS有限元分析软件分别进行电磁场和结构场模拟,分析有无弹性垫、线圈结构和放电位置对蒙皮成形质量的影响规律.结果 在无弹性垫的条件下对板料进行冲击,板料上的塑性应变几乎没有变化.如果采用螺旋方形线圈和带弹性垫的成形工艺,虽然板料上的塑性应变增加,但是线圈正对板料区域出现1.5 mm的鼓包.采用电磁屏蔽方法调整板料上的电磁力分布和材料流动,当线圈在6个位置多次放电后,板料回弹明显减低,并且零件表面光滑.结论 在模拟得到的最佳工艺参数下,建立了实验装置,实验结果与模拟一致. 相似文献
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本文分析了电磁微电机中平面微线圈产生的空间磁场,把微线圈等效几何圆电流和矩形截面电流,导出了空间磁场的计算公式,接着通过四种算法的比较,建立了平面微线圈空间磁场快速准确的数值算法,最后分析了平面微线圈空间磁场的分布特性。 相似文献
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管坯所受磁压力的准确求解是电磁成形变形分析,优化成形系统工艺参数的基础.通过ANSYS/EMAG软件,用远场单元来说明磁场在远场区间的耗散问题,对电磁胀形时作用在管坯上的磁压力进行准确计算.在线圈长度一定的条件下,讨论了管坯尺寸对磁压力瞬态分布和磁场扩散的影响,并根据管坯端部径向磁压力和中部径向磁压力的比值,提出以磁压力分布不均匀系数来反映磁场不均匀分布的程度.计算结果表明:当管坯和线圈的相对长度大于1时,管坯上与线圈等高处承受轴向拉应力,磁场扩散现象不严重;当相对长度小于0.92时,管坯端部承受轴向压应力,磁场扩散现象严重,相对长度0.92时为电磁胀形均匀成形的条件. 相似文献
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《真空》2015,(6)
本文采用计算机FORTRAN语言自主编程,通过建立通电线圈磁场的数学模型,对磁控溅射靶附近由通电线圈产生的磁场分布进行了二维数值模拟计算。计算表明当内、外线圈加反向电流,增加内或外线圈电流,可使通电线圈产生的磁场非平衡度增加,其增加强度由电流增加强度所决定。随着内或外线圈电流增加,真空腔内磁场强度分布更均匀。通过调节内、外电线圈电流,控制磁场分布,从而控制其对等离子体密度及能量分布,可使等离子体因磁场的均匀分布而在真空腔内分布均匀化。另外,这种外加的电磁场还会使磁控装置本体磁场增强,因此对磁控溅射产生的等离子体有增强作用。此结果为磁控溅射装置上磁场配置提供重要参考依据。 相似文献
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曲面间隙测量电涡流传感器探头的性能研究 总被引:1,自引:0,他引:1
针对曲面间间隙测量的实际应用,从电涡流传感器的检测原理出发,对传感器探头的测量性能进行了研究.在平面线圈磁场分布计算的基础上,通过修正得到了曲面线圈的磁场分布规律,进而对线圈的测试性能进行分析和预测,实现了线圈参数的优化设计.同时,对曲面测量的各种影响因素进行了分析和试验验证,为电涡流传感器应用于曲面测量提供参考和依据. 相似文献
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Distribution of magnetic field and electromagnetic force in twin-roll casting of steels was studied by the metod of numerical simulation in this paper,Two-dimension finite element model ,which includes the regions of melt ,stainless collar ,coil and magnetic core ,has been constructed,By solving magnetic vector potential formulations of quasi-static electromagnetic field,distribution of magnetic flux density and magnetic force at different molten heigh is determined,Calculated results showed that intensity of the distribution of magnetic flux density increased linearly with the increased coil current ;and the magnetic force in the melt increased as a quadratic cure with creased coil current ,More attention was given to the distribution of eddy current and magnetic force in the melt ,the confine effect at different molten height was also discussed. 相似文献
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《NDT International》1990,23(1):11-18
The true depth of penetration of eddy currents generated in a conducting sample by an air-cored probe coil, besides depending on the electromagnetic wave frequency and the magnetic permeability and electrical conductivity of the sample, also depends strongly on the coil dimensions and the sample thickness. The standard depth of penetration widely used as a guide for eddy current inspection purposes is calculated for a plane electromagnetic wave incident perpendicularly on a conducting half-space and is thus a material/test parameter rather than a true measure of penetration. In this paper the quantitative relations between true depth of penetration and standard depth of penetration are presented for three configurations of eddy current probe and test material. First an air-cored coil above a conducting half-space is considered, then the same coil above a conducting sheet, and finally the true depth of penetration is calculated in a conducting half-space covered with cladding for different ratios of condictivity between cladding and base material. 相似文献
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《IEEE transactions on magnetics》2009,45(8):3064-3072
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The development of a multistage numerical model of an electromagnetic acoustic transducer (EMAT), with particular emphasis on an EMAT receiver, is presented. The model includes five separate modeling states: static magnetic field simulation of an electromagnet; pulsed eddy current distribution of a generic meander-line coil suspended over a conducting specimen; Lorentz force distribution due to the interaction of the static magnetic field with the eddy current distributions; acoustic wave generation and propagation based on the dynamic Lorentz forces; and acoustic wave detection by an EMAT receiver. In particular, it is shown how the transient particle displacement fields are converted into an induced voltage response as part of the EMAT receiver system. Numerical simulations show that the voltage response is dependent on the wire spacing of the receiver coil 相似文献
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Xianwei Wang Fei Xie Huan Jin 《Journal of Superconductivity and Novel Magnetism》2014,27(4):1015-1019
In order to control the plasma vertical stability of ITER, a novel magnet is developed, that is the vertical stability coil. The coil is located in the vacuum vessel and its safe operation is very important for ITER’s reliable working. During the normal operation, the coil should bear the electromagnetic force caused by the external superconducting magnet and plasma current. The electromagnetic load is one of the important factors to affect the lifetime of the VS coil. Therefore, it is necessary to calculate the magnetic field and evaluate the structural reliability under the electromagnetic load. In this paper, the current at the time “end of burn” was selected to perform the electromagnetic calculation. Based on the Maxwell equation, the magnetic field on the cross section of the upper VS coil was computed and the maximum electromagnetic force corresponding to the magnetic field was also presented. In order to verify the current design model, the finite element model was created by use of ANSYS. The Tresca stress was extracted and classified based on analytical design. The peak stress was compared with the ASME criteria. The analysis has verified the physical model from the perspective of electromagnetic load, and it will offer a guidance for the future optimization. 相似文献