检索结果-内蒙古大学图书馆

Structural health monitoring of composite patch repairs using two-dimensional wavelet maps 4

Structural health monitoring of composite patch repairs usin...

4th International Workshop on Structural Health Monitoring: From Diagnostics and Prognostics to Structural Health Management, IWSHM 2003

作者： Amaravadi, K. Rao, V. Derriso, M.M. Department of MAEM Intelligent Systems Center - UMR France Department of Electrical and Computer Engineering ISC - UMR France Air Force Research Laboratary Wright-Patterson AFB United States

ISBN: (纸本)1932078207

The economic constraints on modern day military and commercial air fleets has imposed longer lifecycles and extended environmental exposure on them. Aging aircrafts are more susceptible to damage due to fatigue and environmental corrosion. Adhesively bonded composite patch repairs have been found to be an economic and reliable means of strengthening aging airframes. However, before this technology is adopted by the aircraft industry the long term durability of the composite patch repairs in terms of their structural integrity has to be thoroughly scrutinized. In this paper a structural health monitoring algorithm has been developed that can detect damage in adhesively bonded composite patch repairs using the dynamic response of a structure. The signal-based health monitoring algorithm, wavelet analysis, has been utilized to detect damage using small local variations in the vibration signature of the structure. Specifically, curvature mode shapes, and wavelet maps, are integrated to detect damage at both single and multiple locations. The dynamical characteristics of the test structure are obtained analytically using linear elastic finite element analysis and experimentally with a Laser Doppler Vibrometer. The results obtained are good. Copyright © 2003 by DEStech Publications, Inc. All right reserved.

关键词： Structural health monitoring

来源：评论

学校读者我要写书评

暂无评论

Reports of the DAS02 working groups

引用

International Journal on Document Analysis and Recognition 2003年第3期6卷 211-217页

作者： Smith, Elisa Barney Monn, David Veeramachaneni, Harsha Kise, Koichi Malizia, Alessio Todoran, Leon El-Nasan, Adnan Ingold, Rolf Department of Electrical and Computer Engineering Boise State University Boise ID United States Center for Communications Research Princeton NJ United States Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY United States Osaka Prefecture University Osaka Japan Department of Information Science University 'La Sapienza' of Rome Rome Italy Intelligent Sensory Information Systems University of Amsterdam Amsterdam Netherlands DIUF University of Fribourg Fribourg Switzerland

This document is a collection of four working group reports in the areas of digital libraries, document image retrieval, layout analysis, and Web document analysis. These reports were the outcome of discussions by participants at the Fifth IAPR International Workshop on Document Analysis systems held in Princeton, NJ on 19-21 August 2002. © Springer-Verlag 2004.

关键词： Digital libraries

来源：评论

学校读者我要写书评

暂无评论

Advanced sonar and odometry error modeling for simultaneous localisation and map building

Advanced sonar and odometry error modeling for simultaneous ...

引用

IEEE International Workshop on intelligent Robots and systems (IROS)

作者： L. Kleeman Intelligent Robotics Research Centre Department of Electrical and Computer Systems Engineering Monash University Australia

An advanced sonar sensor produces accurate range and bearing measurements, classifies targets and rejects interference with one sensing cycle. Two advanced sonar systems are used to simultaneously localise and map an indoor environment using a mobile robot. This paper presents the approach and results from on-the-fly map building using a Kalman filter and a new odometry error model that incorporates variations in effective wheel separation and angle measurements. This model is suited to pneumatic tyre odometry errors where the wheel separation has been found to vary unpredictably with floor surface and path curvature. The paper also presents techniques for detecting sonar feature clutter and selecting strong candidates for ultrasonic landmarks. The paper illustrates that sonar SLAM data association problems are significantly simplified when advanced sonar sensors are employed compared to Polaroid ranging modules.

关键词： Sonar measurements Wheels Sonar detection Interference Indoor environments Mobile robots Ultrasonic variables measurement Goniometers Tires Floors

来源：评论

学校读者我要写书评

暂无评论

Application of genetic algorithms to robotic swarm simulation

Application of genetic algorithms to robotic swarm simulatio...

引用

Congress on Evolutionary Computation

作者： K.W. Tang R.A. Jarvis Intelligent Robotics Research Centre Department of Electrical and Computer Systems Engineering Monash University VIC Australia

Research projects about evolution of agents in a cellular world are not new topics in the artificial life (AL) fields. However, most of the studies focus on those fundamental, social behaviours like energy preservation, pattern formation or leader following etc. This paper presents experiments about applications of genetic algorithms (GAs) to an empirical multiple robot cooperative task: unknown environment exploration. These experiments investigate the effectiveness of GAs for evolving behaviours of individual swarm members that constitute good collective results. They try to answer the questions of (i) Can GAs find such behaviours, or, do such behaviours exist? (ii) Are these behaviours sensitive to environmental changes?.

关键词： Genetic algorithms Robot kinematics intelligent robots intelligent agent systems engineering and theory Robot sensing systems Costs Application software Computational modeling Artificial intelligence

来源：评论

学校读者我要写书评

暂无评论

Embedded microcontroller implementation of a class of condition systems

Embedded microcontroller implementation of a class of condit...

引用

Southeastern Symposium on System Theory

作者： Yu Gong L.E. Holloway Department of Electrical and Computer Engineering and Center for Robotics and Manufacturing Systems University of Kentucky Lexington KY USA

ISBN: (纸本)0780376978

Considers the problem of synthesizing systems modeled by condition systems into microcontrollers. A condition system, a discrete event system model, can be naturally programmed into microcontrollers. Directly using an incidence matrix and state equation to implement condition systems is not a good method for low-cost microcontrollers because of the lack of certain instructions and limited memory of the microcontrollers. An alternate logic algebra based method is presented and an example condition system is illustrated. By using this method, the corresponding assembly code will be easily created in a systematic way.

关键词： Microcontrollers Logic programming Automatic control Automata Transmission line matrix methods Hardware computer aided manufacturing Robots Manufacturing systems Discrete event systems

来源：评论

学校读者我要写书评

暂无评论

Evolution of complex autonomous robot behaviors using competitive fitness

Evolution of complex autonomous robot behaviors using compet...

引用

International Conference on Integration of Knowledge Intensive Multi-Agent systems (KIMAS)

作者： A.L. Nelson E. Grant G. Barlow M. White Center for Robotics and Intelligent Machines Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

Evolutionary robotics (ER) employs population-based artificial evolution to develop behavioral robotics controllers. We focus on the formulation and application of a fitness selection function for ER that makes use of intra-population competitive selection. In the case of behavioral tasks, such as game playing, intra-population competition can lead to the evolution of complex behaviors. In order for this competition to be realized, the fitness of competing controllers must be based mainly on the aggregate success or failure to complete an overall task. However, because initial controller populations are often subminimally competent, and individuals are unable to complete the overall competitive task at all, no selective pressure can be generated at the onset of evolution (the bootstrap problem). In order to accommodate these conflicting elements in selection, we formulate a bimodal fitness selection function. This function accommodates subminimally competent initial populations in early evolution, but allows for binary success/failure competitive selection of controllers that have evolved to perform at a basic level. Large arbitrarily connected neural network-based robot controllers were evolved to play the competitive team game Capture the Flag. Results show that neural controllers evolved under a variety of conditions were competitive with a hand-coded knowledge-based controller and could win a modest majority of games in a large tournament.

关键词： Robot kinematics Erbium Robot control robotics and automation Automatic control intelligent robots Mobile robots Control systems Robot sensing systems Artificial neural networks

来源：评论

学校读者我要写书评

暂无评论

Textual message read by a mobile robot

Textual message read by a mobile robot

引用

IEEE International Workshop on intelligent Robots and systems (IROS)

作者： D. Letourneau F. Michaud J.-M. Valin C. Proulx Department of Electrical Engineering and Computer Engineering Universite de Sherbrooke LABORIUS - Research Laboratory on Mobile Robotics and Intelligent Systems Sherbrooke Quebec CANADA

Giving the ability to read characters and symbols is highly desirable for increased autonomy of mobile robots operating in the real world. The idea is fairly simple: give a robot the ability to acquire an image of a message to read, extract the symbols and recognize them. Image character recognition research has been going on for decades now, with good results. But compared to conventional character recognition systems, the challenge with a mobile robot is to find a textual message to capture in the world and to get a good view of the message, knowing that the viewpoint of the robot depends on its position in relation to the message, which cannot be pre-specified. In this paper we present our approach making it possible for an autonomous mobile robot to read messages. We outline the constraints under which the approach works, and present results obtained using a Pioneer 2 robot equipped with a Pentium 233 MHz and a pan-tilt-zoom camera.

关键词： Mobile robots Robot vision systems Cameras intelligent robots Character recognition Image recognition Navigation Laboratories Mobile computing intelligent systems

来源：评论

学校读者我要写书评

暂无评论

Modeling and control of halfspace systems

Modeling and control of halfspace systems

引用

Southeastern Symposium on System Theory

作者： R. Potluri L.E. Holloway Department of Electrical & Computer Engineering University of Kentucky Lexington KY USA Department of Electrical & Computer Engineering and Center for Robotics & Manufacturing Systems University of Kentucky Lexington KY USA

A halfspace system has the form Ex/sub k+1/ /spl les/ Fx/sub k/ + Bu/sub k/, where E, F /spl isin/ /spl Rfr//sup m/spl times/n/, B /spl isin/ /spl Rfr//sup m/spl times/p/. An example of modeling in this framework is presented. Also presented are the concept of reachability of a static target tube and an algorithm for maintaining a halfspace system in the reachable static target tube.

关键词： Control system synthesis Diffusion tensor imaging computer aided manufacturing Robots Uncertainty Manufacturing systems Artificial intelligence Linear programming

来源：评论

学校读者我要写书评

暂无评论

An optimization framework for dynamic, distributed real-time systems

An optimization framework for dynamic, distributed real-time...

引用

International Parallel and Distributed Processing Symposium, IPDPS 2003

作者： Ecker, Klaus Juedes, David Welch, Lonnie Chelberg, David Bruggeman, Carl Drews, Frank Fleeman, David Parrott, David Pfarr, Barbara Department of Computer Science Technical University of Clausthal Clausthal-Zellerfeld38678 Germany Center for Intelligent Distributed and Dependable Systems School of Electrical Engineering and Computer Science Ohio University AthensOH45701 United States Real-Time Software Engineering Branch NASA Goddard Space Flight Center BaltimoreMD20771 United States

ISBN: (纸本)0769519261

The paper presents a model that is useful for developing resource allocation algorithms for distributed real-time systems that operate in dynamic environments. Interesting aspects of the model include dynamic environments, utility and service levels, which provide a means for graceful degradation in resource-constrained situations and support optimization of the allocation of resources. The paper also provides an allocation algorithm that illustrates how to use the model for producing feasible, optimal resource allocations. © 2003 IEEE.

关键词： Constrained optimization

来源：评论

学校读者我要写书评

暂无评论

Developing evolutionary neural controllers for teams of mobile robots playing a complex game

Developing evolutionary neural controllers for teams of mobi...

引用

IEEE International Conference on Information Reuse and Integration (IRI)

作者： A.L. Nelson E. Grant G. Lee Center for Robotics and Intelligent Machines Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA Department of Electrical and Computer Engineering San Diego State University San Diego CA USA

This research develops methods of automating the production of behavioral robotics controllers. Population-based artificial evolution was employed to train neural network-based controllers to play a robotic version of the team game Capture the Flag. The robot agents used processed video data for sensing their environment. To accommodate the 35 to 150 sensor inputs required, large neural networks of arbitrary connectivity and structure were evolved. An intra-population competitive genetic algorithm was used and selection at each generation was based on whether the different controllers won or lost games over the course of a tournament. This paper focuses on the evolutionary neural controller architecture. Evolved controllers were tested in a series of competitive games and transferred to real robots for physical verification.

关键词： Mobile robots Automatic control Games Robot sensing systems robotics and automation Artificial neural networks Production Robot control Genetic algorithms Testing

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：