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排序方式: 共有190条查询结果,搜索用时 671 毫秒
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Neural Computing and Applications - In this paper, an adaptive neural network (NN) output feedback control is investigated for incommensurate fractional-order permanent magnet synchronous motors... 相似文献
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基于键图法的直流电网系统模型 总被引:1,自引:0,他引:1
为适应直流电网智能、高效、经济运行的要求,实现各换流站间的协调控制,基于六端直流电网物理仿真平台,将多端直流输电系统视为一个多输入、多输出、多控制目标的系统整体进行了数学建模。提出了适用于多节点、系统级仿真的换流器简化模型,分别讨论了各端电源、负载模型的简化方法,利用键图方法对六端树状直流电网进行了等效建模,并提取出其状态空间方程。最后根据电力系统的常规运行要求对直流电网的具体控制目标进行了数学提炼,写出控制问题的约束条件和指标函数,为进一步设计、优化协调控制器提供了基础。 相似文献
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Regulated Breathing Effect of Silicon Negative Electrode for Dramatically Enhanced Performance of Li‐Ion Battery 下载免费PDF全文
Xingcheng Xiao Weidong Zhou Youngnam Kim Ill Ryu Meng Gu Chongmin Wang Gao Liu Zhongyi Liu Huajian Gao 《Advanced functional materials》2015,25(9):1426-1433
Si is an attractive negative electrode material for lithium ion batteries due to its high specific capacity (≈3600 mAh g–1). However, the huge volume swelling and shrinking during cycling, which mimics a breathing effect at the material/electrode/cell level, leads to several coupled issues including fracture of Si particles, unstable solid electrolyte interphase, and low Coulombic efficiency. In this work, the regulation of the breathing effect is reported by using Si–C yolk–shell nanocomposite which has been well‐developed by other researchers. The focus is on understanding how the nanoscaled materials design impacts the mechanical and electrochemical response at electrode level. For the first time, it is possible to observe one order of magnitude of reduction on breathing effect at the electrode level during cycling: the electrode thickness variation reduced down to 10%, comparing with 100% in the electrode with Si nanoparticles as active materials. The Si–C yolk–shell nanocomposite electrode exhibits excellent capacity retention and high cycle efficiency. In situ transmission electron microscopy and finite element simulations consistently reveals that the dramatically enhanced performance is associated with the regulated breathing of the Si in the new composite, therefore the suppression of the overall electrode expansion. 相似文献
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Yalin Lu Miaoquan Li Xingcheng Li 《Journal of Materials Engineering and Performance》2010,19(9):1337-1343
Isothermal compression tests on Al-4Cu-Mg alloy were carried out in semi-solid state. Deformation behavior and microstructural evolution are discussed in this paper. Meanwhile, a new constitutive equation, which couples the grain size and liquid volume fraction, has been established for the semi-solid deformation behavior. The results show that the maximum difference between the calculated with the experimental data is less than 15%. The present equation is satisfactory for describing the correlation between the flow stress and microstructure of semi-solid Al-4Cu-Mg alloy. The coupled simulation of the deformation behavior and microstructural evolution during the semi-solid forming would be conducted easily through writing the present equation in a FE code. 相似文献
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The output intensity of optically pumped NH3 molecules far-infrared laser (NH3-OPFIRL) was calculated by solving the density matrix equation and by means of iteration method. Meanwhile, the spectral characteristic of AC Stark splitting was studied. Finally, the F-P interferogram of NH3-OPFIRL pumped by CO2-10R(8) line was measured. The experimental results were in good agreement with the theoretical calculation results. 相似文献
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