检索结果-南通市图书馆

flying High the Banner of Community of Common Destiny of Mankind

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Contemporary World 2016年第1期 2-3页

作者： SONG TAO International Department CPC Central Committee

There is only one planet for mankind,various countries coexisting in one *** every global moment of 'world history'as termed by Karl Marx,questions like where mankind are heading and where the world is going will be p... 详细信息

关键词： mankind heading flying Banner planet coexisting questions cooperation Peace aiming

在线全文

学校读者我要写书评

暂无评论

flying Apsaras

China Today 1997年第2期46卷 50-51页

***5araisagoddessofwaterandclouds,andthereis***0Chinathr0ughtheSilkRoad,flyingap5arasbegantoappearinChinesemu（共2页)

关键词： flying

A flying Spots Detection and Recovery Scheme Based on Hybrid-Waveform Recognition Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy and Power Engineering 2017年第4期9卷 63-69页

作者： Qiyue Huang Changjin Hu Zhenquan Sun Xiaoning Kang Xuze Zhang Hao Wang Chong Zhao Yali Ma Shaanxi Key Laboratory of Smart Grid (Xi’an Jiaotong University) Xi’an Jiaotong University Xi’an China Shaanxi Regional Electric Power Group CO. LTD Xi’an China Tianjin Power Transmission and Transformation Engineering Company Tianjin China

flying plots detection has been the focus of relay protection in power system for a long time. With the promotion of Smart substation in our country, the number of SV devices is greatly increased. Abnormal data (flying plot) caused by sampling device itself has brought tremendous pressure to the power system. The traditional flying plot detection algorithm has plenty of defects, such as low pertinence, low sensitivity and long sampling period. This paper proposes a new algorithm to identify flying plot by analyzing the wave form characteristics of sampling data. The traditional waveform recognition methods are combined in this algorithm. It has the concept of standard wave window and can distinguish flying plot in a short time. In addition, sine recovery algorithm is used to recover the flying plot. This paper uses PSCAD software to verify the validity of this algorithm. Simulation results show that the proposed method has high reliability.

关键词： Hybrid-Waveform Recognition flying Plot Abnormal Sampling Sine Recovery Standard Wave Window

Torque Control Algorithm and Its Simulation of Capturing a Moving Target for Free flying Space Robots

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Technology Letters 1999年第1期5卷 54-60页

作者：李华忠

Torque control algorithm and its simulation of capturing a moving target for Free flying Space Robots(FFSR) are discussed in this paper. The efficient recursive algorithm of joint driven torque for FFSR is developed. The torque control algorithm combined with Resolved Motion Rate Contro(RMRC) based on Generalized Jacobian Matrix(GJM) for capturing a moving target is proposed. The computer simulation verifies the effectiveness of the proposed algorithm.

关键词： Free flying space robots Joint driving torque Generalized jacobian matrix Computer simulation

Unified Modeling Approach of Kinematics, Dynamics and Control of a Free-flying Space Robot Interacting with a Target Satellite

在线全文

学校读者我要写书评

暂无评论

Intelligent Control and Automation 2011年第1期2卷 8-23页

作者： Murad Shibli 不详

In this paper a unified control-oriented modeling approach is proposed to deal with the kinematics, linear and angular momentum, contact constraints and dynamics of a free-flying space robot interacting with a target satellite. This developed approach combines the dynamics of both systems in one structure along with holonomic and nonholonomic constraints in a single framework. Furthermore, this modeling allows consid-ering the generalized contact forces between the space robot end-effecter and the target satellite as internal forces rather than external forces. As a result of this approach, linear and angular momentum will form holonomic and nonholonomic constraints, respectively. Meanwhile, restricting the motion of the space robot end-effector on the surface of the target satellite will impose geometric constraints. The proposed momentum of the combined system under consideration is a generalization of the momentum model of a free-flying space robot. Based on this unified model, three reduced models are developed. The first reduced dynamics can be considered as a generalization of a free-flying robot without contact with a target satellite. In this re-duced model it is found that the Jacobian and inertia matrices can be considered as an extension of those of a free-flying space robot. Since control of the base attitude rather than its translation is preferred in certain cases, a second reduced model is obtained by eliminating the base linear motion dynamics. For the purpose of the controller development, a third reduced-order dynamical model is then obtained by finding a common solution of all constraints using the concept of orthogonal projection matrices. The objective of this approach is to design a controller to track motion trajectory while regulating the force interaction between the space robot and the target satellite. Many space missions can benefit from such a modeling system, for example, autonomous docking of satellites, rescuing satellites, and satell

关键词： Free-flying Space Robot Target Satellite Servicing flying Robot Adaptive Control Inverse Dynamic Control Hubble Telescope

INVESTIGATIONS OF THE INFLUENCE OF TAPER CONTAMINATION ON THE flying CHARACTERISTICS OF A SLIDER

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 1996年第2期1卷 53-59页

作者： Hua Wei Tan Binglin Wang Chengtao He Yousheng(Dept. of Mechanical Engineering)

The influence of taper contamination on the static and dynamic characteristics of a slider is studiedin detail. Two models of taper contamination, including the effect of skew angle and the number of the railwith taper contamination as well as the amount of contaminator on the taper,are investigated respectively. Anequivalent scheme is applied to evaluate the frequency responses with different flying attitudes in three de-grees of freedom. Ca1culations show that whether model is considered and how many tapers are contaminated,the static and dynamic characteristics of the slider change little in a very large contamination scale,but oncethe amount of contaminator exceeds some limit,the flying attitude of the slider is degraded catastrophically,which is easy to cause the slider crash. The skew angle,when it is large enough,may ameliorate or deterioratethe flying characteristics of the slider depending on the slider attitude when the transverse air flow passesthrough it.

关键词： slider flying characteristics taper contamination

Analytical Solution for Formation flying Problem near Equatorial-Circular Reference Orbit

在线全文

学校读者我要写书评

暂无评论

International Journal of Astronomy and Astrophysics 2019年第3期9卷 217-230页

作者： Shaheera A. Altalhi Magdy Ibrahim El Saftawy King Abdul-Aziz University Jeddah Saudi Arabia National Research Institute of Astronomy and Geophysics Helwan Cairo Egypt

The relative motion between multiple satellites is a developed technique with many applications. Formation-flying missions use the relative motion dynamics in their design. In this work, the motion in invariant relative orbits is considered under the effects of second-order zonal harmonics in an equatorial orbit. The Hamiltonian framework is used to formulate the problem. All the possible conditions of the invariant relative motion are obtained with different inclinations of the follower satellite orbits. These second-order conditions warrantee the drift rates keeping two, or more, neighboring orbits from drifting apart. The conditions have been modeled. All the possibilities of choosing mean elements of the leader satellite orbit and differences in momenta between leader and follower satellites’ orbits are presented.

关键词： Invariant Relative Orbits Formation flying Satellites Relative Motion

Coordinated motion planning algorithm for multi-arm free flying space robot system

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 1999年第4期6卷 42-45页

作者：何光彩洪炳熔柳长安

The motion planning problem of a free flying space robot (FFSR) is investigated and from the attitude disturbance characteristics of a multi arm FFSR, a new method based on the fixed attitude restricted (FAR) Generalized Jacobian Matrix of a multi arm FFSR is proposed to enable the coordinated motion of all the other arms while one arm is tracing a given path so that there is no disturbance on the body, and the problem of attitude disturbance with an operating multi arm FFSR is thereby better resolved. The simulation run with a dual arm FFSR system verifies the effectiveness of this algorithm.

关键词： free flying space robot fixed attitude restricted (FAR) Generalized Jacobian Matrix motions planning attitude control

It's No Dream flying high in the sky'

在线全文

学校读者我要写书评

暂无评论

China's Tibet 1998年第3期9卷 32-33页

ＩＡＯＤＯＮＧＦＡＮＳｏｍｅ３０ｙｅａｒｓａｇｏｗｈｅｎＩｆｉｎｉｓｈｅｄｍｙｕｎｉｖｅｒｓｉｔｙｌｉｆｅ，ＩｗａｓｇｉｖｅｎａｊｏｂｉｎＬｈａｓａ．Ｄｕｒｉｎｇｍｙｙｅａｒｓｔｈｅｒｅ，Ｉｏｆｔｅｎｖｉｓｉｔｅｄｆ... 详细信息

ＩＡＯＤＯＮＧＦＡＮＳｏｍｅ３０ｙｅａｒｓａｇｏｗｈｅｎＩｆｉｎｉｓｈｅｄｍｙｕｎｉｖｅｒｓｉｔｙｌｉｆｅ，ＩｗａｓｇｉｖｅｎａｊｏｂｉｎＬｈａｓａ．Ｄｕｒｉｎｇｍｙｙｅａｒｓｔｈｅｒｅ，ＩｏｆｔｅｎｖｉｓｉｔｅｄｆａｒｍｅｒｓｉｎＤｏｎｇｇａｒｉｎ...

关键词： the sky No Dream flying