检索结果-内蒙古大学图书馆

The 22nd China control and Decision Conference(2010年中国控制与决策会议)

作者： Zhuoda Jiang Key Laboratory of Numerical Control of Jiangxi Province Jiujiang University Jiujiang Jiangxi 332005 China School of Mechatronics Engineering and Automation Shanghai University Shanghai 200072 China

An intelligent model is developed to predict the surface roughness of aluminium alloy in the milling operation based on least square support vector machine (LS-SVM). The Taguchi’s design of experiment was adopted to provide enough training information with minimal experiment times. The present prediction model is to analyze the effects of condition factors, such as spindle speed, feed rate, etc. on the surface roughness (Ra). The tests have been conducted to verify the LS-SVM model, and the average prediction error is about 8％. It means the model is capable to predict the surface roughness well.

关键词： Prediction model Surface roughness Aluminium alloy Support vector machine(SVM) Least square SVM (LS-SVM)

来源：评论

学校读者我要写书评

暂无评论

Comparison of three electrical capacitance tomography systems

Comparison of three electrical capacitance tomography system...

引用

IEEE International Workshop on Imaging Systems and Techniques (IST)

作者： Dixiang Chen Wuqiang Yang Xiang Deng School of Mechatronics Engineering and Automation National University of Defense Technology Changsha China School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing China School of Electrical and Electronic Engineering University of Manchester Institute of Science and Technology Manchester UK

Electrical capacitance tomography (ECT) has been developed for two decades to visualize the internal behavior of industrial processes containing dielectric components. Three different ECT systems have been developed: (1) based on a charge/discharge capacitance measuring circuit, (2) based on an AC circuit and (3) based on an impedance analyzer. In this paper the operation principles, calibration methods and some performance of the three systems are compared. The experimental results prove that the AC-based ECT system is superior to the charge/discharge ECT system. Although the impedance analyzer based ECT system can provide the highest accuracy and the best image quality, it is bulky and expensive.

关键词： Electrical capacitance tomography Circuits Visualization Capacitance measurement Current measurement Dielectric measurements Charge measurement Impedance measurement Calibration Image analysis

来源：评论

学校读者我要写书评

暂无评论

Fast implicit surface reconstruction method based on normal constraints

Fast implicit surface reconstruction method based on normal ...

引用

International Conference on mechatronics and automation

作者： Guo, Guangyue Wu, Xiaojun Wang, Michael Yu Wu, Jianhuang Shenzhen Graduate School Harbin Institute of Technology 518055 China Division of Control and Mechatronics Engineering Shenzhen Graduate School Harbin Institute of Technology 518055 China Mechanical and Automation Engineering Department Chinese University of Hong Kong Shatin N.T. Hong Kong Shenzhen Institute of Advanced Integration Technology Chinese Academy of Sciences Chinese University of Hong Kong Shatin N.T. Hong Kong

ISBN: (纸本)9781424451418

In this paper, a new procedure for implicit surface reconstruction from oriented points is presented. A normal constraints based implicit polynomials fitting method and the partition of unity approach are fused into our framework. Firstly, a large scale input data is subdivided into some overlapping patches by octree. Then the global implicit surface is transferred into local implicit patch fitting and blending of them. To fit the local implicit polynomials, we build an energy by three steps corresponding to enforcement of the interpolatory constraints, satisfying of normal constraints and enhancement of fitting stability. The unkowns in an implicit polynomial are determined by minimizing this quadratic energy function. It is demonstrated in some experiments with several real data sets that this combination provides an intuitive and effective means to approximate the scattered point data associated normals. © 2010 IEEE.

关键词： Surface reconstruction

来源：评论

学校读者我要写书评

暂无评论

A model based compensator for rate-dependent hysteresis in piezoelectric actuators

A model based compensator for rate-dependent hysteresis in p...

引用

IEEE/ASME (AIM) International Conference on Advanced Intelligent mechatronics

作者： Xinliang Zhang Yonghong Tan Ruili Dong Yangqiu Xie School of Electrical Engineering and Automation Henan Polytechnic University Henan China College of Mechanical and Electronic Engineering Shanghai Normal University Shanghai China Center of Precision Mechatronics and Control Engineering Shanghai Normal University Shanghai China School of Electronic Engineering Xidian University Xi'an China

A feedforward compensator for rate-dependent hysteresis in piezoelectric actuators (PEA) is proposed. In this method, a model with parallel structure is proposed to approximate both hysteretic behavior and rate-dependent feature of the PEA. In the model, the rate-independent hysteretic performance is approximated by a neural network based on the so called expanded input space method, while the rate-dependent behavior of the hysteresis is approximated by a network with the sum of weighted first-order difference operators. To transform the multi-valued mapping of the hysteresis into a one-to-one mapping, the expanded input space with a hysteretic operator is constructed. Then, the corresponding neural inverse sub-model is obtained. After that, a compensator is constructed to compensate for the effect of the rate-dependent hysteresis in the PEA. Finally, the experimental results of applying the proposed method to a piezoelectric actuator are presented.

关键词： Hysteresis Artificial neural networks Piezoelectric actuators Adaptation model Feedforward neural networks Training Trajectory

来源：评论

学校读者我要写书评

暂无评论

Friction feedforward compensation and position feedforward in CNC machines

Friction feedforward compensation and position feedforward i...

引用

International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON

作者： Wijin Suteeratanapirom Rapeepong Rattanawaorahirankul Chutima Laosapan Peerayot Sanposh Nattapon Chayopitak Kanokvate Tungpimolrut Hiroaki Kunieda TAIST Tokyo Technology China Intelligent Mechatronics Automation Robotics and Control Laboratory Department of Electrical Engineering Kasetsart University Bangkok Thailand Industrial Control and Automation Laboratory National Electronics and Computer Technology Center Klong Luang Pathum Thani Thailand Department of Electrical and Electronic Engineering Tokyo Institute of Technology Meguro Tokyo Japan

ISBN: (纸本)9781424456062;9789746724913

This research proposes a method to eliminate friction effect and reduced tracking error on CNC milling machines. A CNC milling machine has many connected mechanical components which have friction effects such as ball screws and rails. To control servo motors which are used to drive X-Y table in CNC milling machine, the conventional PID controller is widely used. In this research, Panasonic motor driver is set to the torque control mode. To compensate the friction effects, the friction feedforward compensation method is proposed. Moreover, to reduce the position tracking error, position feedforward controller is used. The simulation and implementation of position control in one axis of PID with Friction Feedforward Compensation and Position Feedforward controller (FFC-PFC) are presented.

关键词： Friction Computer numerical control Metalworking machines Servomotors Three-term control Fasteners Rails Servomechanisms Torque control Error correction

来源：评论

学校读者我要写书评

暂无评论

Comparison of neuro-fuzzy approaches with artificial neural networks for the detection of Ischemia in ECG signals

Comparison of neuro-fuzzy approaches with artificial neural ...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Hoda Tonekabonipour Ali Emam Mohamad Teshnelab Mehdi Aliyari Shoorehdeli Mechatronics Department Qazvin Islamic Azad University Qazvin Iran Electrical Engineering K.N. Toosi University of Technology Tehran Iran Electrical Engineering Advanced Process Automation and Control (APAC) K.N. Toosi University of Technology Tehran Iran

This paper compares different classification methods of ECG signals including their accuracies. First of all , Preprocessing for ECG signal is necessary in order to detect QRS complex. Then, with the intention of extract influential features in Ischemia disease, baseline wandering and noise suppression is done. Following to above mentioned target, two neuro-fuzzy classification algorithms incorporated with two artificial neural networks classifiers selected. They put under test to investigate their ability to recognize Ischemic Heart Disease (IHD) from ECG signals. Adaptive Neuro Fuzzy Inference System (ANFIS) and Locally Linear Model Tree (LOLIMOT), are two neuro-fuzzy networks used in the test. They have good capability of learning. Also Multi layer Perceptron (MLP) and Probabilistic Neural Networks (PNN) used as well in test. These are four structures totally used in this paper. The ECG sampled signals are taken from MIT-BIH database. They are used to train neural networks enabling them to classify Ischemia. All neuro-structures have been tested by using experimental ECG records of individuals. The results suggest that neuro-fuzzy classifiers perform better than the other types of classifiers.

关键词： Electrocardiography

来源：评论

学校读者我要写书评

暂无评论

Expansion-based depth map estimation for multi-view stereo

Expansion-based depth map estimation for multi-view stereo

引用

2010 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Peng Song Xiaojun Wu Michael Yu Wang Jianhuang Wu Postgraduate of Shenzhen Graduate School Harbin Institute of Technology China Division of Control and Mechatronics Engineering Shenzhen Graduate School Harbin Institute of Technology China Mechanical and Automation Engineering Department Chinese University of Hong Kong New Territories Hong Kong China Shenzhen Institutes of Advanced Technology Chinese Academy and Sciences China

This paper presents an algorithm for acquiring high-quality models from multiple calibrated photographs by computing and merging depth maps. The algorithm first computes depth maps from multi-view stereo using a proposed expansion-based approach that returns a 3D point cloud with noisy and redundant information. Then the estimated depth maps are merged into an accurate surface model by a cleaning, downsampling, surface normal estimation and Poisson surface reconstruction process. The proposed approach has been implemented and the experimental results with several real datasets demonstrate that the approach can produce accurate surface models efficiently.

关键词： Clouds Surface reconstruction Image reconstruction Three dimensional displays Pixel Estimation Octrees

来源：评论

学校读者我要写书评

暂无评论

control channel identification method and experimental research on FXLMS vibration control

Control channel identification method and experimental resea...

引用

2009 International Conference on Computational Intelligence and Software engineering, CiSE 2009

作者： Gao, Zhiyuan Qin, Tinggao Huang, Quanzhen Zhu, Xiaojin School of Mechatronics Engineering and Automation Shanghai University Shanghai China Measuring and Control Engineering Group Department of Automation Engineering Shanghai University Shanghai China

ISBN: (纸本)9781424445073

control channel model parameters of adaptive filter feedforward control for piezoelectric smart flexible structures should be predicted, as not only they are the key factors of system stability and control effect but also they have immediate impacts on system convergence and the validity of control strategy. This paper takes the piezoelectric flexible structure as research object. According to least mean square (LMS) algorithm, control channel identification method and its implementation, applied in the MIMO adaptive filter feedforward vibration control, is deduced in detail. Parameter identification, based on which adaptive control for vibration suppression is developed, is performed for the controlled structure, a smart cantilever plate with piezoelectric patches. Experiment results demonstrate the correctness and availability of the control channel identification method and its implementation technique. ©2009 IEEE.

关键词： Adaptive filters

来源：评论

学校读者我要写书评

暂无评论

Evolution of Two Non-identical Two-Level Atoms in Two-Mode Cavity Fields

引用

Communications in Theoretical Physics 2009年第2期51卷 215-220页

作者： ZHANG Ming WANG Wen-Gang DAI Hong-Yi XI Zai-Rong College of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073China College of Science National University of Defense Technology Changsha 410073 China Key Laboratory of Systems and Control Chinese Academy of Sciences Beijing 100080 China

In this paper, we investigate the evolution of two non-identical two-level atoms in two-mode cavity fields. We demonstrate the death and rebirth effect of entanglement for two non-identical two-level atoms under some initial conditions. It is also exemplified that entangled states of two nonidentical two-level atoms can be generated by entangled two-mode cavity fields. This research can be considered as a first step to further investigate the problem of manipulating two nonidentical two-level atoms in two-mode cavity fields.

关键词： entanglement dynamics atorn-cavity fields

来源：评论

学校读者我要写书评

暂无评论

Optical orbital angular momentum for optical communication and its measurements

Optical orbital angular momentum for optical communication a...

引用

International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging

作者： Ke, Xi-Zheng Lv, Hong Wu, Jing-Zhi Hu, Shu-Qiao Faculty of Automation and Information Engineering Xi'An University of Technology Xi'an Shaanxi 710048 China National Key Laboratory for Electronic Measurement Technology Taiyuan Shanxi 030051 China National Key Laboratory for Mechatronics Engineering and Control Xi'an Shaanxi 710065 China

ISBN: (纸本)9780819476630

The beam with orbital angular momentum is a present domestic and foreign research key direction. Its application and development will bring the profound influence in the optical communications field. At the same time, light's orbital angular momentum promises potential applications in both classical and quantum optical communication. The research progress of the beam with orbital angular momentum and encoding information as light's OAM for free-space optical communication were reviewed in this article, the existing design method, mechanism and description methods of encoding information as light's OAM were discussed. In quantum communication, qudits can be encoded in photons using their OAM for creating high-dimensional entanglement based on entangled photon pairs from SPDC. In this paper, light's OAM is used as information carrier for classical and quantum communication, which is promising to ensures the security of atmospheric laser communication, improves the density and precision of information transmission. It is apparent that an efficient way to measure the orbital angular momentum of individual photons and light beams with good efficiency would be of potentially great importance for optical communications and quantum information. In view of the above, the measurements of orbital angular momentum of individual photons and light beams are analyzed and discussed in detail. © 2009 SPIE.

关键词： Light

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：