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离子推进器屏栅电源稳压控制方法研究

电气传动 2024年第3期54卷 38-45页

作者：崔倩周洁敏丁正道秦吉娜高逸清蒋鹏川南京航空航天大学民航学院江苏南京210016

为了解决离子推进器屏栅电源在负载突变过程中产生的过压、过流等问题,对LLC谐振变换器采用移相-变频控制(PS-PFM)稳定输出电压,当采样电压低于设定值下限时,进入变频控制模式,当采样电压高于设定值上限时,进入移相控制模式。实验证明,... 详细信息

为了解决离子推进器屏栅电源在负载突变过程中产生的过压、过流等问题,对LLC谐振变换器采用移相-变频控制(PS-PFM)稳定输出电压,当采样电压低于设定值下限时,进入变频控制模式,当采样电压高于设定值上限时,进入移相控制模式。实验证明,相比于常用的调频控制,移相控制的加入能够解决轻载或空载模式下的电压飘高问题,通过PID参数的调整,可以实现负载跳变时的稳定快速调节,使输出电压保持在设定值;通过PCB布局与磁性元件优化设计,所研制的原理样机在额定情况下效率高达98.9%,功率密度可达6.47×10^(6)W/m^(3),在同等级的电源产品中具有优势。

关键词：离子推进器屏栅电源移相-变频控制全桥LLC谐振变换器负载突变

DETERMINATION OF THERMAL CONDUCTIVITY FOR PARTICULATE MATERIALS

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Journal of Central South University 1998年第2期10卷 44-46页

作者： Magne Lamvik jiemin zhou 1. Department of Applied Mechanics Thermodynamics and Fluid Mechanics Norwegian University of Science and Technology Trondheim Norway 2. Department of Applied Physics and Heat Engineering Central South University of Technology 410083 Changsha China

Ｆｏｒｔｈｅｍｅａｓｕｒｅｍｅｎｔｓｏｆｐａｒｔｉｃｕｌａｔｅｍａｔｅｒｉａｌｓａｍｏｄｉｆｉｅｄｈｏｔｗｉｒｅｔｅｃｈｎｉｑｕｅｗａｓｕｓｅｄ．Ｔｈｅｃｈｏｉｃｅｏｆｔｈｉｓｔｅｃｈｎｉｑｕｅｗａｓｍａｄｅｂｙｃｏ... 详细信息

Ｆｏｒｔｈｅｍｅａｓｕｒｅｍｅｎｔｓｏｆｐａｒｔｉｃｕｌａｔｅｍａｔｅｒｉａｌｓａｍｏｄｉｆｉｅｄｈｏｔｗｉｒｅｔｅｃｈｎｉｑｕｅｗａｓｕｓｅｄ．Ｔｈｅｃｈｏｉｃｅｏｆｔｈｉｓｔｅｃｈｎｉｑｕｅｗａｓｍａｄｅｂｙｃｏｎｓｉｄｅｒｉｎｇｔｈａｔｔｈｅｔ...

关键词： hot wire method thermal conductivity particulate material

FUZZY ADAPTIVE CONTROL MODEL FOR PROCESS IN NICKEL MATTE SMELTING FURNACE

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中国有色金属学会会刊：英文版 1994年第3期4卷 9-11页

作者： Mei, Chi Peng, Xiaoqi zhou, jiemin Central South Univ of Technology Changsha China

ＦＵＺＺＹＡＤＡＰＴＩＶＥＣＯＮＴＲＯＬＭＯＤＥＬＦＯＲＰＲＯＣＥＳＳＩＮＮＩＣＫＥＬＭＡＴＴＥＳＭＥＬＴＩＮＧＦＵＲＮＡＣＥＭｅｉ，ＣｈｉＰｅｎｇ，ＸｉａｏｑｉＺｈｏｕ，Ｊｉｅｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐ... 详细信息

ＦＵＺＺＹＡＤＡＰＴＩＶＥＣＯＮＴＲＯＬＭＯＤＥＬＦＯＲＰＲＯＣＥＳＳＩＮＮＩＣＫＥＬＭＡＴＴＥＳＭＥＬＴＩＮＧＦＵＲＮＡＣＥＭｅｉ，ＣｈｉＰｅｎｇ，ＸｉａｏｑｉＺｈｏｕ，Ｊｉｅｍｉｎ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄＰｈｙｓｉｃｓａｎｄＨｅａ...

关键词： nickel matte smelting furnace fuzzy control

Robustness of anammox granular sludge treating low-strength sewage under various shock loadings:Microbial mechanism and little N2O emission

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Journal of Environmental Sciences 2019年第12期31卷 141-153页

作者： Shanyun Wang Guibing Zhu Yifei Li Xiaoxia Wang jiemin zhou Yongzhen Peng Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Enuironmental SciencesChinese Academy of SciencesBeijing 100085China Jiangnan University School of Environmental and Civil EngineeringWuxiChina National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Beijing University of TechnologyBdjing 100124China University of Chinese Academy of Sciences Beijing 100049China

With the increasing application of anammox for the treatment of high-strength industrial wastewater,application of anammox in municipal sewage has been gaining more *** granulation in particular enhances the enrichment and retention of anammox bacteria in municipal sewage treatment ***,the performance of granular sludge under continuous and varying hydraulic loading shock remains little *** this study,the robustness of anammox granular sludge in treating lowstrength municipal sewage under various shock loadings was *** showed that an upflow anaerobic sludge blanket(UASB)reactor with anammox granules performed well,with anammox specific activity up to 0.28 kg N/kg VSS/day and anti-loading shock capability up to 187.2 L/day during the 8-month testing *** accumulation rate of N2O(<0.01 kg N/kg VSS/day)in the liquid phase was seven times higher than that of the gas phase,which could be mainly attributed to the incomplete denitrification and insufficient carbon ***,only a small part of the produced N2O escaped into the ***-throughput sequencing and molecular ecological network analyses also identified the bacterial diversity and community structure,indicating the potential resistance against loading *** composition and structural analyses showed that polysaccharides were an important functional component in the tightly bound extracellular polymeric substances(TB-EPS),which was the major EPS layer of anammox *** electron microscopy(SEM)also showed that the gaps in between the anammoxclusters in the granules inhibit the flotation of the sludge and ensure efficient settling and retention of anammox granules.

关键词： Anammox Low-strength sewage Varying shock loadings Microbial mechanism N20 emission

Improved wavelet analysis for induction motors mixed-fault diagnosis

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Frontiers of Electrical and Electronic Engineering in China 2007年第3期2卷 355-360页

作者： ZHANG Hanlei zhou jiemin LI Gang College of Aerospace Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Eccentricity is one of the frequent faults of induction motors,and it may cause rub between the rotor and the *** detection of significant rub from pure eccentricity can prolong the lifespan of induction *** paper is devoted to such mixed-fault diagnosis:eccentricity plus rub *** continuous wavelet transform(CWT)is employed to analyze vibration signals obtained from the motor *** improved continuous wavelet transform was proposed to alleviate the frequency *** results show that the proposed method can effectively distinguish two types of faults,single-fault of eccentricity and mixed-fault of eccentricity plus rub.

关键词： induction motor eccentricity rub fault mixed-fault CWT frequency aliasing

A　FUZZY　NEURAL　NETWORK　DECISION　MODEL　ON　THE　OPERATION　PROCESS　OF　ELECTRIC　FURNACE　FOR　CLEANING　SLAG　AND　ITS　APPLICATION

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中国有色金属学会会刊：英文版 1995年第3期5卷 21-24页

作者： Peng, Xiaoqi Mei, Chi zhou, jiemin Tang, Ying(Department of Applied Physics and Heat Engineering,Central South University of Technology, Changsha 410083) Central South Univ of Technology Changsha China

ＡＦＵＺＺＹＮＥＵＲＡＬＮＥＴＷＯＲＫＤＥＣＩＳＩＯＮＭＯＤＥＬＯＮＴＨＥＯＰＥＲＡＴＩＯＮＰＲＯＣＥＳＳＯＦＥＬＥＣＴＲＩＣＦＵＲＮＡＣＥＦＯＲＣＬＥＡＮＩＮＧＳＬＡＧＡＮＤＩＴＳＡＰＰＬＩＣＡＴＩＯＮ￥Ｐｅｎｇ，... 详细信息

ＡＦＵＺＺＹＮＥＵＲＡＬＮＥＴＷＯＲＫＤＥＣＩＳＩＯＮＭＯＤＥＬＯＮＴＨＥＯＰＥＲＡＴＩＯＮＰＲＯＣＥＳＳＯＦＥＬＥＣＴＲＩＣＦＵＲＮＡＣＥＦＯＲＣＬＥＡＮＩＮＧＳＬＡＧＡＮＤＩＴＳＡＰＰＬＩＣＡＴＩＯＮ￥Ｐｅｎｇ，Ｘｉａｏｑｉ；Ｍｅｉ，Ｃｈｉ；Ｚｈ...

关键词： fuzzy neural network electric furnace for cleaning slag IDSS

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双层配碳烧结过程的传热传质分析

化工学报 2017年第5期68卷 1811-1822页

作者：张斌周孑民李茂中南大学能源科学与工程学院湖南长沙410083

为了研究双层配碳下的铁矿石烧结过程及其节能效益,建立了铁矿石烧结过程的二维非稳态数学模型。模型基于多孔介质理论,考虑了烧结过程中的主要物理变化和化学反应,以烧结杯为求解对象,利用FLUENT软件及C语言自定义编程对烧结过程进行... 详细信息

为了研究双层配碳下的铁矿石烧结过程及其节能效益,建立了铁矿石烧结过程的二维非稳态数学模型。模型基于多孔介质理论,考虑了烧结过程中的主要物理变化和化学反应,以烧结杯为求解对象,利用FLUENT软件及C语言自定义编程对烧结过程进行了数值模拟,并利用烧结杯实验数据对模型进行了验证。通过对常规均匀配碳和双层非均匀配碳烧结的传热传质过程进行仿真计算,分析了两种烧结方式下床层温度和物料熔化分数分布,并通过熔化分数对烧结矿成品率进行判定。研究结果表明:在不改变整个床层配碳量的条件下,相对于单层均匀配碳,双层配碳条件下热效率更高,床层温度和物料熔化分数沿料层高度分布更加均匀;上下层物料配碳分别为5%和3.4%且料层厚度相同时,烧结成品率提高10%;降低上层高配碳区料层厚度,即当上下层厚度比为5:9,配碳为5%和3.756%时,成品率能够进一步提高。

关键词：烧结数值模拟传热传质分层配碳熔化分数成品率

ANINTELLIGENT　DECISION　SUPPORTSYSTEM（IDSS）　ONTHEPROCESSOFNICKELMATTESMELTER

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Journal of Central South University 1994年第1期6卷 14-18页

作者： Mei Chi Peng Xiaoqi zhou jiemin(Department of Applied Physics and Heat Engineering, Central South University of Technology, Changsha, 410083, China) Department of Applied Physics and Heat Engineering Central South University of Technology Changsha China

ＡＮＩＮＴＥＬＬＩＧＥＮＴＤＥＣＩＳＩＯＮＳＵＰＰＯＲＴＳＹＳＴＥＭ（ＩＤＳＳ）ＯＮＴＨＥＰＲＯＣＥＳＳＯＦＮＩＣＫＥＬＭＡＴＴＥＳＭＥＬＴＥＲＡＮＩＮＴＥＬＬＩＧＥＮＴＤＥＣＩＳＩＯＮＳＵＰＰＯＲＴＳＹＳＴＥＭ（Ｉ... 详细信息

ＡＮＩＮＴＥＬＬＩＧＥＮＴＤＥＣＩＳＩＯＮＳＵＰＰＯＲＴＳＹＳＴＥＭ（ＩＤＳＳ）ＯＮＴＨＥＰＲＯＣＥＳＳＯＦＮＩＣＫＥＬＭＡＴＴＥＳＭＥＬＴＥＲＡＮＩＮＴＥＬＬＩＧＥＮＴＤＥＣＩＳＩＯＮＳＵＰＰＯＲＴＳＹＳＴＥＭ（ＩＤＳＳ）ＯＮＴＨＥＰＲＯＣＥＳＳＯ...

关键词： fuzzy-decision smelting equipments: nickel matte smelter intelligent decision support system

基于MDCFT与水平集的高海情弹载雷达成像检测方法

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系统工程与电子技术 2024年第4期46卷 1247-1254页

作者：周利胡杰民付连庆凌三力西南电子技术研究所四川成都610036 浙江理工大学信息学院浙江杭州310018

针对舰船三维摆动和海尖峰制约高海情环境弹载雷达探测性能的问题,面向高海情探测环境提出了一种新的成像检测思路。首先,基于高海情环境分别建立舰船与海杂波回波模型;其次,将改进离散调频傅里叶变换算法(modified discrete chirp Four... 详细信息

针对舰船三维摆动和海尖峰制约高海情环境弹载雷达探测性能的问题,面向高海情探测环境提出了一种新的成像检测思路。首先,基于高海情环境分别建立舰船与海杂波回波模型;其次,将改进离散调频傅里叶变换算法(modified discrete chirp Fourier transform, MDCFT)引入回波多普勒成像,消除了高阶项相位导致的散焦现象;在此基础上,利用水平集算法分割目标与背景区域,然后利用聚类算法确定每个目标区域;最后,基于提取的目标特征判决每个区域对应的目标身份。利用仿真数据的实验结果验证了所提算法的有效性。所提方法综合考虑了成像与检测环节性能的提升,为高海情环境下的弹载雷达制导提供了一种可行思路。

关键词：高海情目标检测水平集改进chirp傅里叶变换