检索结果-内蒙古大学图书馆

A Model-based Approach for Achieving Available Automation systems

IFAC Proceedings Volumes 2014年第3期47卷 3438-3443页

作者： R. Priego A. Armentia D. Orive E. Estévez M. Marcos University of the Basque Country Department of System Engineering and Automatics Bilbao 48013 Spain Universidad de Jaén Dept. Of Electronics and Automatic Control Jaen Spain

Nowadays automation systems are required to be flexible in order to cope with the ever changing requirements of the applications in terms of complexity, extensibility or dynamism. The use of reconfiguration techniques helps to meet these demanding requirements, but at the same time increase the complexity of the systems. This paper presents a supervisor architecture that allows maintaining the availability of a control system in spite of failures such as a node crash, by means of reconfigurations at the control level. To do this, the advantages that Model-Driven Development technology provides have been explored.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Recognition of Surfaces Based on Haptic Information Using Self-Organizing Maps

Recognition of Surfaces Based on Haptic Information Using Se...

引用

Annual Conference of the IEEE Industrial Electronics Society

作者： Tomohiro Nakano Rolf Johansson Kouhei Ohnishi Graduate School of Science and Technology Keio University Department of Automatic Control Lund University Department of System Design Engineering Keio University

ISBN: (纸本)9781479940318

This paper proposes a new surface recognition method by a robot. Nowadays, demands for "Real World Haptics" are increasing. Tactile sensation which is acquired by rubbing motion is important for haptics. Therefore, surface recognition based on haptic information is focused in this paper. First, the surface sensing is needed to collect feature values. There are some researches which focus on sensing and analysis of surface tactile information by using sensors with robots. However, there are some disadvantages of using sensors such as signal noise. From that reason, this paper proposes getting surface haptic information without sensors at the tip of the robot. Second, a pattern recognition method needs to be applied for surface recognition. There are some pattern recognition methods. Self-organizing maps (SOM) is one of the solutions. SOM is able to summarize high dimensional data to low dimension with preserving the topological properties of data. SOM is suitable for multi-class recognition. From these reasons, this paper proposes the surface recognition based on haptic information using SOM. Multi class surface recognition is achieved by the proposed method. The validity of the proposed method was confirmed through 7 surface recognition experiments.

关键词： Vectors Haptic interfaces Force Robot sensing systems Feature extraction

来源：评论

学校读者我要写书评

暂无评论

Development of paraplegic quadriceps muscle model using ANN and ANFIS

Development of paraplegic quadriceps muscle model using ANN ...

引用

International Colloquium on Signal Processing & Its Applications, CSPA

作者： S. M. Salleh R. Jailani M. O. Tokhi Faculty of Electrical Engineering Universiti Teknologi MARA Malaysia Shah Alam Selangor Department of Automatic Control and System Engineering University of Sheffied United Kingdom

This paper presents the development of Quadriceps muscle model by using Artificial Neural Network (ANN) and Adaptive Neuro Fuzzy Inference system (ANFIS) based on Functional Electrical Stimulation (FES). The impacts of the output torque with different stimulation parameters (frequency, pulse width and sampling time) are investigated. These parameters will be used to develop the paraplegic muscle models. Muscle models developed are validated with the clinical data to evaluate the accuracy of the output torque predicted compare to the actual paraplegic muscle torque. From the study, ANN is found to be the most accurate model compare to ANFIS with the value of mean squared error of 0.3758. Both developed models in this study can be used in a various control strategies to control FES parameters during rehabilitation proses using FES.

关键词： Muscles Artificial neural networks Mathematical model Data models Force Biological system modeling Adaptation models

来源：评论

学校读者我要写书评

暂无评论

Comparison of resampling algorithms for particle filter based remaining useful life estimation

Comparison of resampling algorithms for particle filter base...

引用

International Conference on Prognostics and Health Management, PHM

作者： Limeng Guo Yu Peng Datong Liu Yue Luo Department of Automatic Test and Control Harbin Institute of Technology Harbin China Beijing System Design Institute of Electro-Mechanic Engineering Beijing China

ISBN: (纸本)9781479949427

Due to the high performance on state tracking and predicting, particle filter (PF) algorithm has been utilized for diagnosis and prognosis in a variety of areas. Especially, PF can provide uncertainty representation and management on estimating the remaining useful life (RUL) of components and systems. However, particle degeneracy phenomenon limits its performance and application in most of the situations. Therefore, several re-sampling algorithms are proposed to alleviate this problem. Thus, different re-sampling algorithms should be focused and studied for the adaptability and applicability in RUL estimation. This work aims to compare the capabilities of different re-sampling algorithms and evaluate the performance in lithium-ion battery RUL prediction. Four re-sampling algorithms including multinomial re-sampling, residual re-sampling stratified re-sampling and systematic re-sampling are involved and analyzed. Actual battery test data sets from NASA PCoE are used to conduct experiments for evaluation and comparison. Moreover, some quantitative analysis metrics are applied to compare the results of battery RUL estimation.

关键词： Prediction algorithms Estimation Batteries systematics Algorithm design and analysis Mathematical model Particle filters

来源：评论

学校读者我要写书评

暂无评论

Identification and Quantification of Hazards Caused by Uncontained Engine Rotor Failure

引用

Procedia engineering 2014年 84卷 93-99页

作者： Li Mailiang Sun Zhiqiang Gong Erling System AnalysisInstitute Air Force Armament Research Academy Beijing 100076 China Department of Automatic Control College of Mechatronic Engineering and Automation National University of Defense Technology Changsha 410073 China

One approach based on AC20-128A is presented in order to assess the risk caused by uncontained engine rotor failure (UERF). In this approach, the risk assessment procedure includes hazard identification and hazard quantification. In the step of hazard identification, the catastrophic functional hazards, derived from the functional hazard analysis (FHA) results for the airplane, are used as the top events to construct the fault trees. The minimal cut sets (MSCs) of the fault trees are the hazards to be identified exactly. In the step of hazard quantification, the probability of one hazard triggered by some uncontained debris is evaluated. After the probabilities of all the identified hazards are quantified, the risk assessment of the airplane is completed. And the assessment result is compared with the design specifications to show compliance with the safety design. A small example is introduced to illustrate the rationality and accuracy of the aforementioned method.

关键词： airplane engine uncontained engine rotor failure airplane safety

来源：评论

学校读者我要写书评

暂无评论

Moving horizon H8 control of variable speed wind turbines with actuator saturation

Moving horizon H8 control of variable speed wind turbines wi...

引用

作者： Ma, Miaomiao Chen, Hong Liu, Xiangjie Allgöwer, Frank Beijing Key Laboratory of New Technology and System on Measuring and Control for Industrial Process North China Electric Power University No. 2 Beinong Road Huilongguan Changping District Beijing 102206 China Institute for Systems Theory and Automatic Control University of Stuttgart Pfaffenwaldring 9 Stuttgart 70550 Germany Department of Control Science and Engineering Jilin University Campus NanLing Renmin Strasse 5988 Changchun 130025 China

This study suggests a moving horizon H8 control scheme for variable speed wind turbines above the rated wind speed to maintain the output power at the rated value for variable operating points. A constrainedH8 control problem is solved at each sampling time with the update of not only the initial condition but also the prediction model based on different operating points. Closed-loop properties inclusive of L2 disturbance attenuation are discussed in the framework of dissipation theory. The moving horizon H8 control considers the non-linear dynamic aspect of the wind turbine, the turbulent nature of the wind and actuator saturations. Analysis and simulation results for WD34 wind turbine show possible improvements on the output electrical power regulation performance for variable operating points, while respecting actuator saturation limits. © The Institution of engineering and Technology 2014.

关键词： Wind turbines

来源：评论

学校读者我要写书评

暂无评论

Managed N-gram language model based on Hadoop framework and a Hbase tables

Managed N-gram language model based on Hadoop framework and ...

引用

The International Conference on Informatics and systems (INFOS)

作者： Tahani Mahmoud Allam Alsayed Abdelhameed Sallam Hatem M. Abdullkader Computer and Automatic Control Department Faculty of Engineering Tanta University Tanta Egypt Information System Department Faculty of Computers and Information Menofia University Menofia Egypt

N-grams are a building block in natural language processing and information retrieval. It is a sequence of a string data like contiguous words or other tokens in text documents. In this work, we study how N-gram can be computed efficiently using a MapReduce for distributed data processing and a distributed database named Hbase This technique is applied to construct the training and testing processes using Hadoop MapReduce framework and Hbase. We proposed to focus on the time cost and storage size of the model and exploring different structures of Hbase table. By constructing and comparing a different table structures on training 100 million words for unigram, bigram and trigram models we suggest a table based on half ngram structure is a more suitable choice for distributed language model. The results of this work can be applied in the cloud computing and other large scale distributed language processing areas.

关键词： Computational modeling Training Smoothing methods Context Testing Informatics Distributed computing

来源：评论

学校读者我要写书评

暂无评论

Explicit interpolation-based nonlinear model predictive control with a convex approximation of the feasible set

Explicit interpolation-based nonlinear model predictive cont...

引用

IEEE Conference on control Technology and Applications (CCTA)

作者： Alexandra Grancharova Sorin Olaru Institute of System Engineering and Robotics Bulgarian Academy of Sciences Sofia Bulgaria SUPELEC Systems Sciences (E3S) - Automatic Control Department

In this paper, an approach to explicit interpolation-based MPC of constrained nonlinear systems is proposed, which is based on the ideas in [9], [10] for explicit constrained control of linear systems by applying interpolation techniques. The developed approach can be considered as an extension of the method in [9], [10] in the following directions: (i) nonlinear discrete-time systems are considered, which are regulated to the origin by solving an NMPC problem, (ii) a method for construction of a convex approximation of the feasible set for the formulated NMPC problem is suggested, (iii) the vertex control (the control values at the vertices of the approximate feasible set) is determined by solving the NMPC problem, instead of maximizing the control action, (iv) an algorithm for explicit interpolation-based NMPC is developed, where the explicit approximate solution is defined on a simplicial partition of the convex approximate feasible set. The proposed approach is illustrated on a numerical example.

关键词： Interpolation Optimization Nonlinear systems Discrete-time systems Optimal control Approximation error

来源：评论

学校读者我要写书评

暂无评论

Fault tolerant predictive control for multi-agent dynamical systems: Formation reconfiguration using set-theoretic approach

Fault tolerant predictive control for multi-agent dynamical ...

引用

International Conference on control, Decision and Information Technologies (CoDIT)

作者： M.T. Nguyen C. Stoica Maniu S. Olaru A. Grancharova SUPELEC Systems Sciences (E3S) - Automatic Control Department Gif-sur-Yvette France Bulgarian Academy of Sciences Institute of System Engineering and Robotics Sofia Bulgaria

This paper deals with the task assignment problem, which represents a major issue in dynamical formation control. The formation is defined in terms of a group of homogeneous dynamical agents. The position of each agent in the formation is predetermined by pre-imposing the distance between each pair of agents. Recently by using set-theoretic methods, the task assignment has been formulated in terms of an optimization problem allowing to keep the agents in a tight formation in real-time. In this paper we revisit these results and propose a new algorithm for the task assignment formulation in view of real-time control by including fault detection and isolation capabilities. The proposed methods will be illustrated by means of a numerical example.

关键词： Safety Trajectory Optimization Silicon Fault detection Equations Real-time systems

来源：评论

学校读者我要写书评

暂无评论

A dual phase modular fuzzy control structure for an automode wheelchair in ascending and descending stairs

A dual phase modular fuzzy control structure for an automode...

引用

2013 IET Conference on control and Automation: Uniting Problems and Solutions

作者： Ghani, N.M.A. Nasir, A.N.K. Hassan, M.A.H. Tokhi, M.O. Automatic Control and System Engineering Department University of Sheffield United Kingdom

ISBN: (纸本)9781849197106

Climbing a flight of stairs using a wheelchair is not as simple as balancing it on two wheels. Stairs climbing involves several phases, to ensure stability and safety in an auto-mode system. The subtle design of a stair climbing wheelchair system consists of three main actuators;a pair of motors, one for acting on each wheel and one for seat position. The operation of the system is based on the wheel rotation by lifting and bringing the other pair of wheels over one another on the staircases and vice versa. The challenge resides in an appropriate mechanical design and implementation of robust controller for the system to guarantee stability of the overall wheelchair while performing stair ascending and descending task automatically, with an assistant-free mode. A dwi-phase fuzzy logic control is introduced in this work and evaluated through intensive visual simulation to verify the proposed control approach.

关键词： Fuzzy logic

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：