检索结果-内蒙古大学图书馆

IEEE International conference on Robotics and Automation (ICRA)

作者： J. Nakanishi T. Fukuda D.E. Koditschek Department of Electrical Engineering and Computer Science University of Michigan USA Department of Mechano-Informatics and Systems University of Nagoya Nagoya Aichi Japan Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA

We report on our preliminary studies of a new controller for a two-link brachiating robot. Motivated by the pendulum-like motion of an ape's brachiation, we encode this task as the output of a "target dynamical system". Numerical simulations indicate that the resulting controller solves a number of brachiating problems that we term the "ladder", "swing up" and "rope" problems. Preliminary analysis provides some explanation for this success. We discuss a number of formal questions whose answers will be required to gain a full understanding of the strengths and weaknesses of this approach.

关键词： Robot control Legged locomotion Control systems Computer science Numerical simulation Motion control Manipulators Actuators Elbow Joining processes

来源：评论

学校读者我要写书评

暂无评论

simulation of the electric drive system of electric rolling stocks

Simulation of the electric drive system of electric rolling ...

引用

IEEE International conference on Intelligent engineering Systems (INES)

作者： T. Gajdar C. Burlacu Y. Suda E. Masada Institute of Industrial Science University of Tokyo Tokyo Japan Department of Electrical Engineering University of Tokyo Tokyo Japan

In this paper an AC drive system of a commuter train is investigated with regards to the load and line side perturbations. In order to carry out the study, a simple drive longitudinal train dynamical system has been developed, where the motor is driven by a voltage type inverter. This paper first describes and outlines the effects of load side perturbations, encountered as friction coefficient changes and normal load variations. Next, effects of line side disturbances on the drive system in terms of overvoltage and voltage drop due to the loss of contact between pantograph and catenary, are investigated.

关键词： Vehicle dynamics Creep Wheels Inverters AC motors Rails Induction motors Equations Torque Industrial engineering

来源：评论

学校读者我要写书评

暂无评论

Robust control of an underactuated surface vessel with thruster dynamics

Robust control of an underactuated surface vessel with thrus...

引用

American Control conference (ACC)

作者： K.Y. Pettersen O. Egeland Department of Engineering Cybernetics Norwegian University of Science and Technology Trondheim Norway

A continuous periodic time-varying feedback law is proposed that exponentially stabilizes both the position and orientation of a surface vessel having only two actuators. To this end, a stability result for a class of homogeneous time-periodic systems is presented. The exponential stability provided by the proposed feedback law does not depend on exact knowledge of the model parameters, and is thus robust to model parameter uncertainty. The surface vessel model considered is nonlinear and describes both the dynamics and the kinematics of the surface vessel. Furthermore the actuator dynamics is included in the control design. simulation results are presented.

关键词： Robust control Actuators Feedback Vehicle dynamics Open loop systems Vehicles Control systems Robust stability Kinematics Control design

来源：评论

学校读者我要写书评

暂无评论

An incremental parallel tangent learning algorithm for artificial neural networks

An incremental parallel tangent learning algorithm for artif...

引用

Canadian conference on Electrical and Computer engineering (CCECE)

作者： A.R. Nezami V.C. Bhavsar A.A. Ghorbani Faculty of Computer Science University of New Brunswick Fredericton NB Canada Faculty of Computer Engineering Iran University of Science and Technology Tehran Iran

Ghorbani and Bhavasar (1993) proposed a modified backpropagation training algorithm using a deflecting gradient method-parallel tangent (Partan) gradient method-to accelerate convergence. We have also proposed the incremental inter-neuron communication method. In the incremental communication method, instead of communicating the full magnitude of the output value of a node, only the (reduced precision) increment or decrement to its previous value is sent on a communication link. In this paper, Partan is modified to incorporate incremental communication. The effects of the limited precision incremental communication method on the convergence behaviour and performance of the Partan backpropagation algorithm are investigated with the sonar problem discussed in literature. It is found through simulation that the communication costs during the training process decrease by a factor of 1.6. The application of the incremental reduced precision Partan method to larger networks is expected to result into even higher savings in communication costs.

关键词： Artificial neural networks Backpropagation algorithms Convergence Costs Gradient methods Sonar Optimization methods Acceleration Computer science Niobium

来源：评论

学校读者我要写书评

暂无评论

Bessie: portable generation of network topologies for simulation

Bessie: portable generation of network topologies for simula...

引用

International conference on Computer Communications and Networks (ICCCN)

作者： F. Adelstein F. Hosch G.G. Richard L. Schwiebert Xerox Design Research Institute Cornell University Ithaca NY USA Department of Computer Science University of New Orleans New Orleans LA USA Department of Electrical and Computer Engineering Wayne State University Detroit MI USA

ISBN: (纸本)0818690143

The widespread use of computer networking has resulted in considerable attention being paid to a variety of network-related problems, the generation of efficient multicast trees being one. While many algorithms for generation of multicast trees have been proposed their relative effectiveness is difficult to assess. Some algorithms have never been implemented. Many have been simulated, but often using ad-hoc networking modeling and simulation tools, without consistent parameters, making direct comparisons difficult. In this paper we discuss a network topology generation tool named Bessie, written entirely in java. Bessie generates descriptions of random point-to-point and hierarchical networks, based on user-specified statistical parameters. We introduce a modification to Waxman's (1988) parameters, commonly used in grid-based network topology generators, which eliminates undesirable increases in node degree as the number of nodes in a network increases. The modification improves on proposed fixed scale factors.

关键词： Network topology Tree graphs Multicast algorithms Computational modeling Computer simulation Computer networks Multicast protocols java Bandwidth Cost function

来源：评论

学校读者我要写书评

暂无评论

CASA: computer aided systems architecting

CASA: computer aided systems architecting

引用

International conference and Workshop on engineering of Computer-Based Systems

作者： C. Schaffer Institute for Systems Science Department for Systems Theory and Information Engineering Johannes Kepler University Linz Linz Austria

This paper presents a method (CASA-ME) and a tool environment (CASA-TE) supporting the design of computer based systems. The methodology is based on architectural descriptions which not only allow the descriptions of components, connections and composite structures, but CASA-ME provides a mechanism allowing architectural related design knowledge. Beside these architectural descriptions CASA-ME also provides a mechanism allowing the formulation and traceability of requirements. simulation models built with external tools and coordinated by CASA-TE are used to validate and verify these requirements. After elaborating on the different concepts of CASA-ME a few words are said about CASA-TE which is under development. Small examples are used to demonstrate the different concepts of CASA-ME.

关键词： Design engineering Power engineering and energy Electromagnetic compatibility Hierarchical systems Hardware Decision making Modeling Systems engineering and theory Energy management Knowledge management

来源：评论

学校读者我要写书评

暂无评论

Modeling and simulation of failure processes in composites

Ceramic Engineering and Science Proceedings

引用

Ceramic engineering and science proceedings 1997年第4 B期18卷 323-330页

作者： Fish, Jacob Shek, Kamlun Gomaa, Said Shephard, Mark S. Dvorak, George J. Bachrach, William E. Wafa, Amr M. Rensselaer Polytechnic Inst Troy United States

The paper describes recent research conducted at Rensselaer aimed at modeling and simulation of failure processes in composite materials and structures using micromechanical and macromechanical approaches. The micromechanical approach is based on the mathematical homogenization theory with eigenstrains and a rapid post-processing procedure, which enables you to solve large scale structural systems in heterogeneous media at a cost comparable to problems in homogeneous media without significantly compromising on solution accuracy. The building blocks of the macromechanical approach are as follows: (i) enriching through-the-thickness kinematics of the shell to compute 3D effects, (ii) simulation of the delamination growth by incorporating discontinuous through-the-thickness interpolants, (iii) development delamination indicators to predict the critical regions so that enriched shell elements would be used only when and where it is necessary to do so, (iv) use of continuum damage mechanics approach to simulate evolution of delamination growth, and (v) calibration of critical damage parameters at the interface against the fracture toughnesses.

关键词： Composite materials

来源：评论

学校读者我要写书评

暂无评论

Criticality prediction models using SDL metrics set

Criticality prediction models using SDL metrics set

引用

Asia-Pacific conference on Software engineering

作者： Euy-Seok Hong Chi-Su Wu Department of Computer Science Seoul National University Seoul South Korea

ISBN: (纸本)081868271X

This paper focuses on the experiences gained from defining design metrics for SDL and comparing three prediction models for identifying the most fault-prone entities using the defined metrics. Three sets of design complexity metrics for SDL are defined according to two design phases and SDL entity types. Two neural net based prediction models and a model using the hybrid metrics are implemented and compared by a simulation. Though the backpropagation model shows the best prediction results, the selection method in hybrid complexity order is expected to have similar performance with some supports. Also two hybrid metric forms (weighted sum and weighted multiplication) are compared and it is shown that two metric forms can be used interchangeably for ordinal purpose.

关键词： Predictive models Software maintenance Fault diagnosis Neural networks Software design Real time systems Application software Algorithm design and analysis Process design Classification tree analysis

来源：评论

学校读者我要写书评

暂无评论

Uniting local and global controllers for the Caltech ducted fan

Uniting local and global controllers for the Caltech ducted ...

引用

American Control conference (ACC)

作者： A.R. Teel O.E. Kaiser R.M. Murray Electrical Engineering Department University of Minnesota Minneapolis MN USA ETH Zürich Automatic Control Laboratory Zurich Switzerland Engineering and Applied Science California Institute of Technology Pasadena CA USA

Caltech's ducted fan experiment is used as a case study to investigate the properties of an algorithm for uniting local and global controllers proposed by Teel et al. (1997). To simplify the control design process and to illustrate robustness, the ducted fan is modeled as a linear system with input rate limits. The local controller is an (fairly aggressive) LQR state feedback while the (semi-) global controller is a much less aggressive LQR state feedback. Closed-loop simulation results are provided using a fully nonlinear model of the ducted fan derived from wind tunnel data. Experimental results are also provided using the actual Caltech ducted fan.

关键词： Linear systems Control design State feedback Control systems Automatic control Aerospace control Engines Laboratories Algorithm design and analysis Degradation

来源：评论

学校读者我要写书评

暂无评论

Synthesis of quadratic stability control for a class of similar composite systems

Synthesis of quadratic stability control for a class of simi...

引用

IEEE conference on Decision and Control

作者： Longjun Qian Xingya Lu Jingcai Wang Siying Zhang School of Informat ion Science and Engineering Northeastern University Shenyang China

ISBN: (纸本)0780341872

This paper studies the synthesis of quadratic control for a class of large-scale systems, which composed of N identical subsystems interconnected with an external system in a similar fashion. The similar structural information is utilized to reduce the synthesis of control design to solving several low order algebraic Riccati inequalities determined by corresponding isolated subsystems and the similar structural information of interconnections. A simulation example is included to demonstrate the effectiveness of the presented methods.

关键词： Control system synthesis Stability Interconnected systems Large-scale systems Power generation Control design Power system interconnection Symmetric matrices Riccati equations Power engineering and energy

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：