Cu^(+)-doped alkali borosilicate glasses with different Na_(2)O contents were prepared by the melting method,and the effects of different R values(R=Na_(2)O/B_(2)O_(3))on the structure,ion presence state and luminesce...Cu^(+)-doped alkali borosilicate glasses with different Na_(2)O contents were prepared by the melting method,and the effects of different R values(R=Na_(2)O/B_(2)O_(3))on the structure,ion presence state and luminescence properties of Cu^(+)-doped alkali borosilicate glasses were investigated.The analysis by FT-IR and Raman spectroscopy shows that,with the increase of R value of the glass,the[BO_(3)]in the structure of Cu^(+)-doped alkali borosilicate glass transforms into[BO_(4)]and the number of non-bridging oxygen in the glass network appears to be slightly increased.The absorption spectra and EPR analysis reveal that the Cu^(+)content in the glass gradually decreases and the Cu^(2+)content gradually increases as the R value of the glass increases.XPS and PL tests further indicate that the transformation of the octahedral coordination structure of Cu^(+)to the octahedral coordination structure of Cu^(2+)and the cubic coordination structure of Cu^(+)occurs in the glass as the R value of the glass increases.This transformation can effectively reduce the concentration quenching phenomenon of Cu^(+)and improve the fluorescence luminescence intensity of the glass samples.Meanwhile,the samples were found to have luminescence tunability as well as good thermal stability.展开更多
针对不同故障模式下航空变压整流器二极管故障特征相似程度高导致不易区分的问题,提出一种基于堆叠降噪自动编码器(stacked denoising auto encoder,SDAE)与粒子群优化支持向量机(partical swarm optimization support vector machine,P...针对不同故障模式下航空变压整流器二极管故障特征相似程度高导致不易区分的问题,提出一种基于堆叠降噪自动编码器(stacked denoising auto encoder,SDAE)与粒子群优化支持向量机(partical swarm optimization support vector machine,PSOSVM)相结合的故障诊断方法.首先搭建航空变压整流器仿真模型,通过对不同故障模式进行仿真,获取故障数据;然后运用SDAE方法对高维故障信号进行故障特征提取,建立故障特征集;最后采用PSOSVM方法进行故障诊断,并且与常用的故障诊断方法进行对比分析.诊断结果表明SDAE-PSOSVM故障诊断方法准确性达到96%,可以对高维故障数据信号进行特征提取,提高不同故障模式之间的区分度.展开更多
针对高速磁浮列车在狭窄空间内高经济性、高可靠性车载供电需求,在耦合磁路、电气性能仿真、设计优化基础上,提出一种发射端多匝线圈且无磁芯、拾取端类似双U型耦合磁路结构的非接触供电系统(inductive power supply,IPS),该系统采用了...针对高速磁浮列车在狭窄空间内高经济性、高可靠性车载供电需求,在耦合磁路、电气性能仿真、设计优化基础上,提出一种发射端多匝线圈且无磁芯、拾取端类似双U型耦合磁路结构的非接触供电系统(inductive power supply,IPS),该系统采用了理论设计、仿真分析以及试验验证相结合的研究方法.首先,根据高速磁浮列车供电需求,通过理论计算确定各设备主要参数,完成IPS系统设计方案;然后,进行耦合磁路设计及仿真分析:利用Maxwell软件对多种耦合磁路进行3D仿真分析,确定耦合磁路最优设计方案,开展三维电磁仿真得到拾取装置与地面发射线圈间互感;紧接着,进行电气性能仿真分析:利用Matlab软件建立IPS系统电气仿真模型,仿真IPS系统传输功率及效率,根据供电需求确定补偿装置、地面逆变电源及DC/DC参数;最后,研制完成供电功率150 kW磁场耦合非接触供电系统,并部署于磁浮样车试验线,完成了现场EMC (electromagnetic magnetic compatibility)性能、电气性能测试验证.验证结果表明:传输功率超过150 kW,效率92%,达到项目预期目标.展开更多
为更加精确、快速地分析高速磁浮悬浮电磁铁的电磁力特性,实现与控制、动力学模型的良好匹配,提出一种基于非线性材料的高速磁浮悬浮电磁铁电磁力建模方法.首先,在搭建电磁铁等效磁路(equivalent magnetic circuit,EMC)模型时,考虑了导...为更加精确、快速地分析高速磁浮悬浮电磁铁的电磁力特性,实现与控制、动力学模型的良好匹配,提出一种基于非线性材料的高速磁浮悬浮电磁铁电磁力建模方法.首先,在搭建电磁铁等效磁路(equivalent magnetic circuit,EMC)模型时,考虑了导磁材料自身的非线性,导磁材料的磁阻计算以内部磁通为基础,推导以电压及间隙为输入,电流及电磁力为输出的电磁铁解析模型,计算电磁力-间隙-电流特性,并与传统EMC模型进行对比分析;其次,搭建电磁铁有限元(finite element method,FEM)模型,对非线性EMC模型的结果进行验证;最后,采用地面试验台对悬浮电磁铁进行电磁力测试,验证EMC及FEM模型的准确性.研究结果表明:与传统电磁力模型相比,本文EMC模型计算的电磁力在大电流区间会出现饱和现象,更接近实际情况,适用范围更广;磁间隙12.5 mm,电流50 A工况下,EMC与FME计算的电磁力偏差仅为4.5%,且与试验结果具有非常高的一致性;高精度的非线性电磁力模型为悬浮系统动态特性联合分析及参数优化奠定了基础.展开更多
基金Funded by the Key R&D Projects in Hubei Province of China(No:2020BAB061)。
文摘Cu^(+)-doped alkali borosilicate glasses with different Na_(2)O contents were prepared by the melting method,and the effects of different R values(R=Na_(2)O/B_(2)O_(3))on the structure,ion presence state and luminescence properties of Cu^(+)-doped alkali borosilicate glasses were investigated.The analysis by FT-IR and Raman spectroscopy shows that,with the increase of R value of the glass,the[BO_(3)]in the structure of Cu^(+)-doped alkali borosilicate glass transforms into[BO_(4)]and the number of non-bridging oxygen in the glass network appears to be slightly increased.The absorption spectra and EPR analysis reveal that the Cu^(+)content in the glass gradually decreases and the Cu^(2+)content gradually increases as the R value of the glass increases.XPS and PL tests further indicate that the transformation of the octahedral coordination structure of Cu^(+)to the octahedral coordination structure of Cu^(2+)and the cubic coordination structure of Cu^(+)occurs in the glass as the R value of the glass increases.This transformation can effectively reduce the concentration quenching phenomenon of Cu^(+)and improve the fluorescence luminescence intensity of the glass samples.Meanwhile,the samples were found to have luminescence tunability as well as good thermal stability.
文摘针对不同故障模式下航空变压整流器二极管故障特征相似程度高导致不易区分的问题,提出一种基于堆叠降噪自动编码器(stacked denoising auto encoder,SDAE)与粒子群优化支持向量机(partical swarm optimization support vector machine,PSOSVM)相结合的故障诊断方法.首先搭建航空变压整流器仿真模型,通过对不同故障模式进行仿真,获取故障数据;然后运用SDAE方法对高维故障信号进行故障特征提取,建立故障特征集;最后采用PSOSVM方法进行故障诊断,并且与常用的故障诊断方法进行对比分析.诊断结果表明SDAE-PSOSVM故障诊断方法准确性达到96%,可以对高维故障数据信号进行特征提取,提高不同故障模式之间的区分度.
文摘针对高速磁浮列车在狭窄空间内高经济性、高可靠性车载供电需求,在耦合磁路、电气性能仿真、设计优化基础上,提出一种发射端多匝线圈且无磁芯、拾取端类似双U型耦合磁路结构的非接触供电系统(inductive power supply,IPS),该系统采用了理论设计、仿真分析以及试验验证相结合的研究方法.首先,根据高速磁浮列车供电需求,通过理论计算确定各设备主要参数,完成IPS系统设计方案;然后,进行耦合磁路设计及仿真分析:利用Maxwell软件对多种耦合磁路进行3D仿真分析,确定耦合磁路最优设计方案,开展三维电磁仿真得到拾取装置与地面发射线圈间互感;紧接着,进行电气性能仿真分析:利用Matlab软件建立IPS系统电气仿真模型,仿真IPS系统传输功率及效率,根据供电需求确定补偿装置、地面逆变电源及DC/DC参数;最后,研制完成供电功率150 kW磁场耦合非接触供电系统,并部署于磁浮样车试验线,完成了现场EMC (electromagnetic magnetic compatibility)性能、电气性能测试验证.验证结果表明:传输功率超过150 kW,效率92%,达到项目预期目标.
文摘为更加精确、快速地分析高速磁浮悬浮电磁铁的电磁力特性,实现与控制、动力学模型的良好匹配,提出一种基于非线性材料的高速磁浮悬浮电磁铁电磁力建模方法.首先,在搭建电磁铁等效磁路(equivalent magnetic circuit,EMC)模型时,考虑了导磁材料自身的非线性,导磁材料的磁阻计算以内部磁通为基础,推导以电压及间隙为输入,电流及电磁力为输出的电磁铁解析模型,计算电磁力-间隙-电流特性,并与传统EMC模型进行对比分析;其次,搭建电磁铁有限元(finite element method,FEM)模型,对非线性EMC模型的结果进行验证;最后,采用地面试验台对悬浮电磁铁进行电磁力测试,验证EMC及FEM模型的准确性.研究结果表明:与传统电磁力模型相比,本文EMC模型计算的电磁力在大电流区间会出现饱和现象,更接近实际情况,适用范围更广;磁间隙12.5 mm,电流50 A工况下,EMC与FME计算的电磁力偏差仅为4.5%,且与试验结果具有非常高的一致性;高精度的非线性电磁力模型为悬浮系统动态特性联合分析及参数优化奠定了基础.
