检索结果-内蒙古大学图书馆

IEEE International Conference on System, Man, and Cybernetic

作者： Yu, Li Ma, Maode Tianjin Univ Dept Comp Sci Tianjin 300072 Peoples R China Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

ISBN: (纸本)9781424423835

In order to eliminate oscillation arisen from AIMD window control strategy in TCP, an adaptive PI rate controller (PI-RCA) was proposed to smooth the traffic and to prevent network from congestion. Theoretical analysis and simulation evaluation showed that PI-RCA can make flow control system achieve stability robustness and adapt to sudden changes in network environment, thus providing the network with good transient behaviors. In this paper, we present an implemental evaluation of PI-RCA. We first implemented PI-RCA in the Linux kernel and solved various system issues. Second, we conducted some experiments to validate the previous simulation results. Compared with TCP, the experimental results show that the PI-RCA is much more easily to maximize link/per-flow utilization, to achieve fairness and nearly zero packet drops rate.

关键词： congestion control active queue management control algorithm proportional-integral control experiment

来源：评论

学校读者我要写书评

暂无评论

Rendezvous Maneuvers of Multiple Spacecraft Using Differential Drag Under J₂ Perturbation

引用

JOURNAL OF GUIDANCE control AND DYNAMICS 2008年第6期31卷 1595-1607页

作者： Bevilacqua, R. Romano, M. USN Postgrad Sch Dept Mech & Astronaut Engn Monterey CA 93943 USA USN Postgrad Sch Space Syst Acad Grp Monterey CA 93943 USA

In this work, the residual atmospheric drag is exploited to perform rendezvous maneuvers among multiple spacecraft in low Earth orbits. These maneuvers are required, for instance, for autonomous on-orbit assembly. By varying the level of aerodynamic drag of each spacecraft, relative differential accelerations are generated among the spacecraft of the group and therefore their relative orbits are controlled. Each of the spacecraft is assumed to include a drag plate, which can be actively opened or closed, to vary the atmospheric drag. The recently developed Schweighart-Sedwick model is used to describe the relative dynamics of different spacecraft with respect to a circular orbit with the inclusion of J(2) effects. Furthermore, the natural relative dynamics of each chaser with respect to the target is decoupled into a secular motion and a periodic oscillation. In particular, the following two-phase control method is proposed. First, the secular motion of each chaser is controlled via differential drag in order for the spacecraft to sequentially move from an arbitrary initial condition to a closed stable relative orbit around the target spacecraft. After the relative orbit stabilization, a relative eccentricity control is applied to each spacecraft to zero-out the semi-axis of the relative orbit around the target and to achieve the rendezvous condition. The control algorithm considers mutual constraints among the values of differential drag that the different spacecraft can experience. Potential collisions are avoided by changing the maneuvering initial time. The main advantage of the proposed technique is that it enables a fleet of spacecraft to rendezvous without propellant expenditure. Furthermore, no numerical optimization is needed, because the control policy is based on closed-form analytical solutions. The proposed technique was validated via numerical simulations.

关键词： Spacecrafts Spacecraft Robotics Laboratory ISS Aerodynamic Drag Earth Orbital Period Monte Carlo Simulation control algorithm Propellant Target Spacecraft

来源：评论

学校读者我要写书评

暂无评论

Coordinated standoff tracking of moving targets using Lyapunov guidance vector fields

引用

JOURNAL OF GUIDANCE control AND DYNAMICS 2008年第2期31卷 290-306页

作者： Frew, Eric W. Lawrence, Dale A. Morris, Steve Univ Colorado Boulder CO 80302 USA MLB Co Mountain View CA 94043 USA

This paper presents a control structure for cooperative stand-off line-of-sight tracking of a moving target by a team of unmanned aircraft based on a Lyapunov guidance vector field that produces stable convergence to a circling limit cycle behavior. A guidance vector field is designed for a stationary target and then modified with a correction term that accounts for a moving target and constant background wind. Cooperative tracking by multiple unmanned aircraft is achieved through additional phasing, also with a Lyapunov stability analysis. Convoy protection, in which the unmanned aircraft must scout an area ahead of the moving target, is performed by extending the cooperative stand-off line-of-sight limit cycle attractor along the direction of travel. Simulation results demonstrate the behavior of the algorithms as well as the improvement that results from cooperation. Finally, simulations of a larger cooperative search, acquisition, and tracking scenario are described that illustrate the use of the cooperative standoff line-of-sight and convoy protection controllers in a realistic application.

关键词： Lyapunov Stability Theory Standoff Tracking Flight control System Aircraft Speed Track algorithm Optimization algorithm Heading Angle Guidance Laws GPS control algorithm

来源：评论

学校读者我要写书评

暂无评论

Design, simulation, and analog circuit implementation of a three-phase shunt active filter using the I cos Φ algorithm

引用

IEEE TRANSACTIONS ON POWER DELIVERY 2008年第2期23卷 1222-1235页

作者： Bhuvaneswari, G. Nair, Manjula G. Indian Inst Technol Dept Elect Engn New Delhi 110016 India

A three-phase shunt active filtering algorithm based on the real component of fundamental load current (I cos phi) has been proposed and implemented in a novel manner in this paper. The complete simulation and hardware implementation of the active filter (AF) with the proposed algorithm has been presented. Simulations have been performed for various dynamic operating conditions under balanced/unbalanced nonlinear reactive loads for both balanced as well as unbalanced/distorted source conditions. The AF has been realized by means of a hysteresis current-controlled voltage-source inverter (VSI). The experimental setup is controlled by making use of simple op-amp-based analog circuits and digital signal processor ADMC401. Experimental results have been obtained for different load and source conditions and discussed in detail. The response of the AF system in simulation as well as in hardware proves the effectiveness of the proposed control technique.

关键词： analog and digital implementation control algorithm power quality (PQ) reactive nonlinear loads shunt active filter (SAF)

来源：评论

学校读者我要写书评

暂无评论

Active stiffness control of wind-rain-induced vibration of prototype stay cable

引用

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 2008年第1期74卷 80-100页

作者： Wang, L. Y. Xu, Y. L. Fuzhou Univ Coll Civil Engn Fujian Peoples R China Hong Kong Polytech Univ Dept Civil & Struct Engn Kowloon Hong Kong Peoples R China

The cables in a cable-stayed bridge usually possess low inherent damping and are prone to wind-induced, traffic-induced, and wind-rain-induced vibrations. This paper establishes an active control algorithm using the stiffness control method to suppress wind-rain-induced vibration of prototype stay cables. By neglecting the axial inertia force and the modal coupling, the governing equations of motion of wind-rain-induced vibration control of prototype stay cables with active stiffness control algorithm are first derived. The fourth-order Runge-Kutta method is then introduced to find the numerical solutions to the problem. Extensive parameter studies have been carried out for investigating the features of the control method as a design guideline. Copyright (C) 2007 John Wiley & Sons, Ltd.

关键词： prototype stay cable wind-rain-induced cable vibration active stiffness control control algorithm numerical solution

来源：评论

学校读者我要写书评

暂无评论

Smart Wireless Temperature Data Logger Using IEEE 802.15.4/ZigBee Protocol

Smart Wireless Temperature Data Logger Using IEEE 802.15.4/Z...

引用

IEEE Region 10 Conference (TENCON 2008)

作者： Sehgal, Vivek Kumar Nitin Chauhan, Durg Singh Sharma, Rohit Jaypee Univ Informat Technol Waknaghat Dept ECE Solan HP India Jaypee Univ Informat Technol Waknaghat Dept CSE & IT Solan HP India

ISBN: (纸本)9781424424085

This Paper proposed a portable wireless data acquisition system for temperature in real time process dynamics. Process variables (like temperature, pressure, flow, level) vary with time in certain applications and this variation should be recorded so that a control action can take place at a defined set point This paper proposes an 8 bit embedded platform for a sensor having a network interface using the 802.15.4, ZigBee protocol, that is specially designed for the sensors network. The ZigBee protocol is a wireless technology developed as an open global standard to address the unique needs of low-cost, low-power, wireless sensors network This wireless data logger senses and monitors the variations in the local temperature thereby transmits the data within the range to an assigned embedded processor based server. Received temperature is displayed on a local liquid crystal display (LCD) on assigned server and simultaneously on a computer.

关键词： Temperature Sensor Embedded controller ZigBee Protocol control algorithm

来源：评论

学校读者我要写书评

暂无评论

Key Techniques for Multi-satellite Integrated Navigation System Modeling and controlling

Key Techniques for Multi-satellite Integrated Navigation Sys...

引用

2nd International Symposium on Systems and control in Aerospace and Astronautics

作者： Yu, Xiaolei Sun, Yongrong Liu, Jianye Wu, Ling Chen, Yuan Miao, Jianfeng Nanjing Univ Aeronaut & Astronaut Coll Automat Engn Nanjing 210016 Peoples R China

ISBN: (纸本)9781424439089

Multi-satellite integrated navigation system, the research focus navigation field both at home and abroad, is expected to improve the precision of positioning service and security of the information. The paper starts with an introduction of the basic concept of multi-satellite navigation system. It then follows a literature review covering mainly the current status of foreign and domestic research in this field. Subsequently, the key techniques of the GPS/GALILEO multi-satellite integrated navigation system have been explored, with the system of modeling method and control algorithm based on Kalman filtering technology as the research emphasis. Finally, the positioning errors of GPS, GALILEO and GPS/GALILEO systems are compared by the experiments along a typical route. Furthermore, the results show that the precision of navigation can be improved by way of multi-satellite integrated navigation because of more visible satellites and better space distribution structure. In particular, the modeling method and control algorithm for multi-satellite system presented in the paper will show the crucial significance in terms of improving accuracy in positioning applications.

关键词： Multi-satellite integrated navigation system System modeling Kalman filtering technology control algorithm Precision of navigation

来源：评论

学校读者我要写书评

暂无评论

Design and Application of Digital Servo controller Module Based on DSP and CPLD

Design and Application of Digital Servo Controller Module Ba...

引用

7th World Congress on Intelligent control and Automation

作者： Ji, Wei Xu, Bo Zhao, Dean Jiangsu Univ Elect & Informat Engn Dept Zhenjiang Jiangsu Prov Peoples R China

ISBN: (纸本)9781424421138

A novel controller module based on DSP and CPLD is introduced according to the characteristic and requirement of servo control system. The hardware and software are discussed in detail. The high-speed DSP is acted as core for digital servo controller. The CPLD is adopted to achieve peripheral signal processing and control for logic and sequence. A function library is built according to C++ class structure and can be applied randomly. The experimental results show that the controller has the advantages of high reliability, opening structure, simple operation and can be applied with flexibility according to engineer requirement.

关键词： Servo control Digital signal processor (DSP) Complex programmable logical device(CPLD) control algorithm

来源：评论

学校读者我要写书评

暂无评论

Virtual Laboratory for Distance Learning, Remote Process control

引用

IFAC Proceedings Volumes 2008年第2期41卷 9807-9811页

作者： Dumitru Popescu Ion Matei Catalin Dimon University “Politehnica” of Bucharest Department of Control Engineering Splaiul Independentei 313 060042 sector 6 Bucuresti

This paper describes the philosophy behind the remote level control of a didactical platform. Issues related to the hardware and software architecture that allow remote access to the experimental platform using a simple Internet browser and some concepts about the control strategy used are presented. The virtual laboratory application is built primarily as an educational tool for distance learning, but these types of applications can be extended, with some considerations, to industrial process control.

关键词： remote control virtual laboratory educational aids control algorithm digital control

来源：评论

学校读者我要写书评

暂无评论

Research on control algorithm of Battery State for Hybrid-Driven Armored Vehicle

Research on Control Algorithm of Battery State for Hybrid-Dr...

引用

ICEMI'2005第七届国际电子测量与仪器学术会议

作者： Hu Jinsuo1,2 Zhu Chunbo1 Yang Zuobin1 Cheng Shukang1 (1.Harbin Institute of Technology, Harbin 150001,China) (2.Beijing Special Vehicle Institute, Beijing, 100072, China)

Chemical batteries have been used as electric energy storage devices for many years. With the revival of interest in electric transportation, great effort and investment have been put into the researc

关键词： control algorithm battery state HAV SOC.

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：