磁芯非线性磁化特性的精确表征是感应电压叠加器(induction voltage Adder,IVA)数值模拟的关键,由于IVA的激励脉冲前沿为几十纳秒,磁芯在快脉冲条件下的磁化特性难以直接通过实验测试。为此提出一种非晶夹膜磁芯逆J-A参数的预测方法,通...磁芯非线性磁化特性的精确表征是感应电压叠加器(induction voltage Adder,IVA)数值模拟的关键,由于IVA的激励脉冲前沿为几十纳秒,磁芯在快脉冲条件下的磁化特性难以直接通过实验测试。为此提出一种非晶夹膜磁芯逆J-A参数的预测方法,通过双绕组法测试不同脉冲频率下磁芯的磁滞回线,将磁芯的饱和磁感应强度、剩余磁感应强度、矫顽力、矫顽力点微分磁导率、饱和磁场强度作为磁滞回线的关键特征参数,实验控制磁芯励磁电流峰值保证磁芯的饱和点不变,并通过数值拟合得到剩余磁感应强度、矫顽力和矫顽力点微分磁导率与激励脉冲等值频率之间的关系,最后利用高频率下的特征参数绘制磁滞回线再进行逆J-A参数辨识。以磁滞回线的面积表征单位体积的磁芯能量损耗,实验测试了2组兆赫兹以上的磁滞回线,预测的磁滞回线与实测磁滞回线的磁芯能量损耗误差<3%,验证了此种方法的有效性,快脉冲激励下辨识得到的逆J-A参数可应用于IVA磁芯的非线性建模。展开更多
Thepaper investigates the properties of the Lambert equivalent azimuthal projection,which is often used in normal aspect in atlases for maps of the northern and southern hemispheres.The field of research is theoretica...Thepaper investigates the properties of the Lambert equivalent azimuthal projection,which is often used in normal aspect in atlases for maps of the northern and southern hemispheres.The field of research is theoretical in nature and assumes a mastery of mathematics because it deals with map projections.The transverse aspect is commonly used for eastern and western hemisphere atlas maps.In addition,the Hammer projection was created fromthe transverse aspect of that projection.Therefore,if we want to get to know the Hammer projection better,we must first investigate the Lambert equivalent azimuthal projection in detail.While investigating this projection,it was observed that the equations of the transverse aspect can be represented in several ways.After that,it was necessary to determine the most suitable form of the equations of that projection for the calculation of partial derivatives,which are necessary for determining distortions.The article presents the distribution of factors of local linear scales along the(pseudo)meridians and(pseudo)parallels,and found that in the Lambert equivalent azimuthal projection,there can exist only one point where the distortion is equal to zero.The general case of a normal and transverse Lambert equivalent azimuthal projection has not been observed so far,and that is the new contribution of this article.展开更多
文摘磁芯非线性磁化特性的精确表征是感应电压叠加器(induction voltage Adder,IVA)数值模拟的关键,由于IVA的激励脉冲前沿为几十纳秒,磁芯在快脉冲条件下的磁化特性难以直接通过实验测试。为此提出一种非晶夹膜磁芯逆J-A参数的预测方法,通过双绕组法测试不同脉冲频率下磁芯的磁滞回线,将磁芯的饱和磁感应强度、剩余磁感应强度、矫顽力、矫顽力点微分磁导率、饱和磁场强度作为磁滞回线的关键特征参数,实验控制磁芯励磁电流峰值保证磁芯的饱和点不变,并通过数值拟合得到剩余磁感应强度、矫顽力和矫顽力点微分磁导率与激励脉冲等值频率之间的关系,最后利用高频率下的特征参数绘制磁滞回线再进行逆J-A参数辨识。以磁滞回线的面积表征单位体积的磁芯能量损耗,实验测试了2组兆赫兹以上的磁滞回线,预测的磁滞回线与实测磁滞回线的磁芯能量损耗误差<3%,验证了此种方法的有效性,快脉冲激励下辨识得到的逆J-A参数可应用于IVA磁芯的非线性建模。
文摘Thepaper investigates the properties of the Lambert equivalent azimuthal projection,which is often used in normal aspect in atlases for maps of the northern and southern hemispheres.The field of research is theoretical in nature and assumes a mastery of mathematics because it deals with map projections.The transverse aspect is commonly used for eastern and western hemisphere atlas maps.In addition,the Hammer projection was created fromthe transverse aspect of that projection.Therefore,if we want to get to know the Hammer projection better,we must first investigate the Lambert equivalent azimuthal projection in detail.While investigating this projection,it was observed that the equations of the transverse aspect can be represented in several ways.After that,it was necessary to determine the most suitable form of the equations of that projection for the calculation of partial derivatives,which are necessary for determining distortions.The article presents the distribution of factors of local linear scales along the(pseudo)meridians and(pseudo)parallels,and found that in the Lambert equivalent azimuthal projection,there can exist only one point where the distortion is equal to zero.The general case of a normal and transverse Lambert equivalent azimuthal projection has not been observed so far,and that is the new contribution of this article.
