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国家高技术研究发展计划(863Program)

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相关作者:王志功廖小平翁端吴晓东陈伟平更多>>
相关机构:东南大学中国科学院清华大学更多>>
发文基金:国家高技术研究发展计划国家自然科学基金国家重点基础研究发展计划更多>>
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3,149 条 记 录,以下是 1-10
排序方式:
Decoupling Control of Bearingless Permanent Magnet-type Synchronous Motor Based on Artificial Neural Networks Inverse System Method
A bearingless permanent magnet-type synchronous motor (BPMSM) is a complicated nonlinear strong-coupled system...
Xiao-dong Sun School of electrical and information engineering
Data Transmission Reliability of a Two-source Single-sink Computer Network with a Common Arc
2013年
在一个多状态网络(MSN ) ,数据能通过不同路径被播送。以前的文学与路径在有一条普通的弧的弧拆散路径,然而并非盒子集中于盒子。在这个工作,我们认为盒子是节点通过他们的自己的最小的路径(MP ) 正在送数据到水池节点的二来源,在这二 MP 在计算机网络拥有一条普通的弧的地方。每个来源节点产生一个数据序列。产生数据的时间间隔是随机分布式的。另外,在不同时间片刻产生的数据的数量是随机分布式的。这二个变量能被 Monte-Carlo 模拟方法获得。当所有数据通过一条普通的弧被播送,用弧和 conflictions 为优先级竞争的数据需要可以被引起。我们在他们的传播时间限制下面认为二 MP 在连接并且计算的盒子是数据的可靠性。模拟结果表明 conflictions 能延长他们的传播时间并且因此影响他们的可靠性。这个工作可以提供相互参照让经理决定数据和时间间隔的数量得到理想的网络可靠性。
ZHANG Yun XU Zheng-Guo WANG Wen-Hai LU Jian-Gang SUN You-Xian
关键词:网络可靠性网络数据传输
Delay-dependent stabilization of singular Markovian jump systems with state delay被引量:1
2009年
This paper deals with the delay-dependent stabilization problem for singular systems with Markovian jump parameters and time delays. A delay-dependent condition is established for the considered system to be regular, impulse free and stochastically stable. Based on the condition, a design algorithm of the desired state feedback controller which guarantees the resultant closed-loop system to be regular, impulse free and stochastically stable is proposed in terms of a set of strict linear matrix inequalities (LMIs). Numerical examples show the effectiveness of the proposed methods.
Zhengguang WU Hongye SU Jian CHU
关键词:DELAY-DEPENDENT
Development of Integrated Precision Vibration-Assisted Micro-Engraving System
2011年
A novel precision vibration-assisted micro-engraving system was developed by the integration of fast tool servo and ultrasonic elliptical vibration system, in which the flexure hinge was designed to avoid backlash and PID control algorithm was established to guarantee specific precision. Apart from experimental validation of the performance of the system, various micro-V-grooves cutting experiments on aluminum alloy, ferrous material and hard cutting material were performed, in which Kistler force sensor was used to measure cutting force. Through experiments, it was clear that the vibration-assisted micro-engraving system can ensure good quality of micro-V-grooves and reduce cutting force by about 60% compared with traditional removal process without ultrasonic vibration.
陈华伟程明龙李佑杰张德远
Scaling all-fiber mid-infrared supercontinuum up to 10 W-level based on thermal-spliced silica fiber and ZBLAN fiber被引量:13
2016年
We demonstrate an integrated all-fiber mid-infrared(mid-IR)supercontinuum(SC)source generated by a 1.95μm master oscillator power amplifier system and a single-mode ZBLAN(ZrF_4–BaF_2–LaF_3–AlF_3–NaF)fiber.The maximum average output power is 10.67 W with spectral bandwidth covering from~1.9 to 4.1μm.The single-mode ZBLAN fiber and silica fiber are thermal-spliced to enhance the robustness and practicability of the system.It is,to the best of our knowledge,the first high-power integrated compacted all-fiber mid-IR SC source based on thermal-spliced silica fiber and ZBLAN fiber.
Zhijian ZhengDeqin OuyangJunqing ZhaoMinqiu LiuShuangchen RuanPeiguang YanJinzhang Wang
Problems and Countermeasures of 3S Technologies Application in Precision Agriculture
3S technologies are the core technologies of precision agriculture.On the basis of deep analysis of the curren...
Qiulan WuZhihong LiuDANDan YangZhenrong Han
关键词:APPLICATIONPROBLEMSCOUNTERMEASURES
Analysis of Attitude Control Method of Flight Machine Based on Gas-Jet Side Force
<正>This paper analyzes the influence of Laval nozzle geometry parameters on jet properties.The Laval nozzle is...
Yin Yaobao~(1*)
关键词:PNEUMATICS
文献传递
Impacts of Large-scale Wind Power Grid Integration on Relay Protection and Countermeasures被引量:6
2012年
Several large-scale wind turbine tripping accidents occurred in Jiuquan wind power base in 2011.According to the on-site survey and analysis of these accidents related to relay protection,causes were found to be the collection system defects and low correct operation rate of small current grounded line selectors of the unearthed neutral point collection system.By referring to both the characteristics of Jiuquan wind power base and arrangement of relay protection,the short-circuit features of wind power and its impacts on relay protection are analyzed.The collection system and the retrofit of the small current grounded line selector are improved by specific countermeasures.Finally,further research subjects are put forward.
He, Shien Suonan, Jiale Kang, Xiaoning Song, Guobing
关键词:大型风力发电机组小电流接地选线事故发生运转率
Application of Computational Fluid Dynamics and Fluid Structure Interaction Techniques for Calculating the 3D Transient Flow of Journal Bearings Coupled with Rotor Systems被引量:20
2012年
Journal bearings are important parts to keep the high dynamic performance of rotor machinery. Some methods have already been proposed to analysis the flow field of journal bearings, and in most of these methods simplified physical model and classic Reynolds equation are always applied. While the application of the general computational fluid dynamics (CFD)-fluid structure interaction (FSI) techniques is more beneficial for analysis of the fluid field in a journal bearing when more detailed solutions are needed. This paper deals with the quasi-coupling calculation of transient fluid dynamics of oil film in journal bearings and rotor dynamics with CFD-FSI techniques. The fluid dynamics of oil film is calculated by applying the so-called "dynamic mesh" technique. A new mesh movement approacb is presented while the dynamic mesh models provided by FLUENT are not suitable for the transient oil flow in journal bearings. The proposed mesh movement approach is based on the structured mesh. When the joumal moves, the movement distance of every grid in the flow field of bearing can be calculated, and then the update of the volume mesh can be handled automatically by user defined function (UDF). The journal displacement at each time step is obtained by solving the moving equations of the rotor-bearing system under the known oil film force condition. A case study is carried out to calculate the locus of the journal center and pressure distribution of the journal in order to prove the feasibility of this method. The calculating results indicate that the proposed method can predict the transient flow field of a journal bearing in a rotor-bearing system where more realistic models are involved. The presented calculation method provides a basis for studying the nonlinear dynamic behavior of a general rotor-bearing system.
LI QiangYU GuichangLIU ShulianZHENG Shuiying
Predictive ability of genomic selection models for breeding value estimation on growth traits of Pacific white shrimp Litopenaeus vannamei被引量:4
2017年
Genomic selection(GS)can be used to accelerate genetic improvement by shortening the selection interval.The successful application of GS depends largely on the accuracy of the prediction of genomic estimated breeding value(GEBV).This study is a fi rst attempt to understand the practicality of GS in Litopenaeus vannamei and aims to evaluate models for GS on growth traits.The performance of GS models in L.vannamei was evaluated in a population consisting of 205 individuals,which were genotyped for 6 359 single nucleotide polymorphism(SNP)markers by specifi c length amplifi ed fragment sequencing(SLAF-seq)and phenotyped for body length and body weight.Three GS models(RR-BLUP,Bayes A,and Bayesian LASSO)were used to obtain the GEBV,and their predictive ability was assessed by the reliability of the GEBV and the bias of the predicted phenotypes.The mean reliability of the GEBVs for body length and body weight predicted by the dif ferent models was 0.296 and 0.411,respectively.For each trait,the performances of the three models were very similar to each other with respect to predictability.The regression coeffi cients estimated by the three models were close to one,suggesting near to zero bias for the predictions.Therefore,when GS was applied in a L.vannamei population for the studied scenarios,all three models appeared practicable.Further analyses suggested that improved estimation of the genomic prediction could be realized by increasing the size of the training population as well as the density of SNPs.
王全超于洋李富花张晓军相建海
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