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Effects on dynamic characters of antenna structures in satellite induced by disordered parameters
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作者 刘相秋 《High Technology Letters》 EI CAS 2009年第2期135-140,共6页
A simplified dynamic model of a dish antenna in satellite is established in this article.The modelcan be easily used to analyze the dynamic behaviour of the antenna structure.In terms of the simplifiedmodel,effects on... A simplified dynamic model of a dish antenna in satellite is established in this article.The modelcan be easily used to analyze the dynamic behaviour of the antenna structure.In terms of the simplifiedmodel,effects on dynamic characters due to the disorder of parameters are investigated in details.Thefrequencies calculated by the simplified model accord with those computed by ANSYS.Based on the modeshapes of disordered and perfect structure,the influence law and varying trend of dynamic characters ofantenna structures in satellites produced by stiffness and mass of antenna ribs,stiffness of antenna mem-branes and angles between adjacent ribs,are obtained.The analyses in the paper indicate that the effectsby disordered parameters can not be ignored in the dynamic analysis of such structures. 展开更多
关键词 antenna structures in satellite simplified dynamic model disordered parameters dynamic characters vibration mode localization
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Dynamic character analysis for the arc welding power source based on fuzzy logic 被引量:2
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作者 王振民 薛家祥 王富光 《China Welding》 EI CAS 2007年第4期1-6,共6页
A lot of experimental methods have been brought forth to assess the dynamic character of the arc welding power source, but up to now, this issue has not been solved very well. In this paper, based on the fuzzy logic r... A lot of experimental methods have been brought forth to assess the dynamic character of the arc welding power source, but up to now, this issue has not been solved very well. In this paper, based on the fuzzy logic reasoning method, a dynamic character assessing model for the arc welding power source was established and used to analyze the dynamic character of the welding power source. Three different types of welding machine have been tested, and the characteristic information of the electrical signals such as re-striking arc voltage, low welding current and so on of the welding process were extracted accurately by using a self-developed welding dynamic arc wavelet analyzer. The experimental results indicate that this model can be used as a new assessing method for the dynamic character of the arc welding power source. 展开更多
关键词 arc welding power source fuzzy logic reasoning wavelet analysis dynamic character
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Dynamic characteristics of multi-arc thermal plasma in four types of electrode configurations 被引量:1
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作者 Yanjun ZHAO Guohua NI +6 位作者 Wei LIU Hongmei SUN Siyuan SUI Dongdong LI Huan ZHENG Zhongyang MA Chi ZHANG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2022年第5期183-194,共12页
The enhanced volume of thermal plasma is produced by a multi-arc thermal plasma generator with three pairs of discharge electrodes driven by three directed current power suppliers.Combined with a high-speed camera and... The enhanced volume of thermal plasma is produced by a multi-arc thermal plasma generator with three pairs of discharge electrodes driven by three directed current power suppliers.Combined with a high-speed camera and an oscilloscope,which acquire optical and electric signals synchronously,the dynamic behavior of different kinds of multi-arc discharge adjusted by the electrode arrangement is investigated.Also,the spatial distributions and instability of the arc discharge are analyzed in four electrode configurations using the gray value statistical method.It is found that the cathodic arcs mainly show a contracting state,while the anodic arcs have a trend of transition from shrinkage to a diffusion-like state with the increase of the discharge current.As a result of the adjustment of the electrode configuration,a high temperature region formed in the center of the discharge region in configurations of adjacent electrodes with opposite flow distribution and opposite electrodes with swirl flow distribution due to severe fluctuation of arcs.The discharge voltage rises with increased discharge current in this novel multi-arc plasma generator.It is also found that anode ablation mainly occurs on the conical surface at the copper electrode tip,while cathode erosion mainly occurs on the surface of the inserted tungsten and the nearby copper. 展开更多
关键词 multi-arc electrode configuration dynamic character EROSION
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DYNAMICAL CHARACTER FOR A PERTURBED COUPLED NONLINEAR SCHRDINGER SYSTEM
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作者 余沛 高平 郭柏灵 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2005年第7期823-829,共7页
The dynamical character for a perturbed coupled nonlinear Schrodinger system with periodic boundary condition was studied. First, the dynamical character of perturbed and unperturbed systems on the invariant plane was... The dynamical character for a perturbed coupled nonlinear Schrodinger system with periodic boundary condition was studied. First, the dynamical character of perturbed and unperturbed systems on the invariant plane was analyzed by the spectrum of the linear operator. Then the existence of the locally invariant manifolds was proved by the singular perturbation theory and the fixed-point argument. 展开更多
关键词 coupled nonlinear Schrodinger system dynamical character invariantmanifold
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Observation of Blobs and Holes in the Boundary Plasma of EAST Tokamak 被引量:1
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作者 颜宁 徐国盛 +13 位作者 张炜 常加峰 王亮 刘少承 刘鹏 汪惠乾 蒋敏 熊豪 丁斯晔 万宝年 高翔 V.NAULIN A.H.NIELSEN J.JuulRASMUSSEN 《Plasma Science and Technology》 SCIE EI CAS CSCD 2011年第4期410-414,共5页
Intermittent convective transport at the edge and in the scrape-off layer (SOL) of EAST was investigated by using fast reciprocating Langmuir probe. Holes, as part of plasma structures, were detected for the first t... Intermittent convective transport at the edge and in the scrape-off layer (SOL) of EAST was investigated by using fast reciprocating Langmuir probe. Holes, as part of plasma structures, were detected for the first time inside the shear layer. The amplitude probability distribution function of the turbulence is strongly skewed, with positive skewed events ("blobs") prevailing in the SOL region and negative skewed events ("holes") dominant inside the shear layer. The statistical properties coincide with previous observations from JET. The generation mechanism of blobs and holes is also discussed. In addition burst structure and dynamics character of them are also presented. 展开更多
关键词 intermittent transport BLOBS HOLES generation mechanism dynamics character
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Design of a New Chaos Circuit and Its Encryption to Digital Information 被引量:3
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作者 王宏 彭建华 周正欧 《Journal of Electronic Science and Technology of China》 2004年第4期25-28,共4页
A new hyperchaos circuit system with simple structure is designed in this paper. It can be implemented with changeable dimensions 3, 5, 7, 9, etc, therefore it can afford different security grades for applications. Th... A new hyperchaos circuit system with simple structure is designed in this paper. It can be implemented with changeable dimensions 3, 5, 7, 9, etc, therefore it can afford different security grades for applications. The dynamic characters of the 7th order circuit have been analyzed as an example. Using the hyperchaos time sequence produced by this circuit as key sequence, the encryption and decryption to digital signals of text and image files have been realized, and the real-time ability has been increased with encrypting digital signals per byte. 展开更多
关键词 HYPERCHAOS dynamic character key sequence ENCRYPTION
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Regional Man-land System:Its Dynamics Characters,Structure and Evolutionary Models
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作者 ZHAO Bingdong QIN Yaochen ZHAO Qingliang Department of Geography, Henan University, Kaifeng 475001 《Systems Science and Systems Engineering》 CSCD 1997年第3期84-91,共8页
From the point of view of dynamics, the author studies some important issues concerning the dynamics of the regional man land system. As a complex composition of man land interaction, the regional man land system i... From the point of view of dynamics, the author studies some important issues concerning the dynamics of the regional man land system. As a complex composition of man land interaction, the regional man land system is a semi open, nonlinear and partly controllable system which possesses a multi hierarchy interface structure and has its own evolutionary law. The dynamics characters, the dynamic structure and the evolutionary models of the regional man land system are all deeply discussed in this paper. 展开更多
关键词 regional man land system dynamics characters dynamics structure evolutionary models.
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