检索结果-内蒙古大学图书馆

An improved wavelet filtering algorithm for NMR spin echo

Journal of Information and Computational Science 2015年第8期12卷 2911-2918页

作者： Ma, Shuangbao Gao, Hongliang Li, Kong College of Automation Huazhong University of Science and Technology Wuhan China College of Mechanical Engineering and Automation Wuhan Textile University Wuhan China College of Mechatronics and Control Engineering Hubei Normal University HuangshiHubei China

An improved wavelet filtering algorithm is put forward based on the mean-value filtering function in this paper for the spin echo signal of Nuclear Magnetic Resonance Logging (NMRL), the Signal to Noise Ratio (SNR) of which is always very low. The detailed steps of this improved algorithm, which includes the advantages of mean-value filtering and wavelet filtering algorithm respectively, are designed based on the wavelet-based threshold filtering method. This paper also builds a 32-point forward model of big porosity in order to generate the spin echo signal with adjustable SNR for an experiment. The median filtering, wavelet hard threshold filtering, wavelet soft threshold filtering and the improved filtering algorithm are used to filter the constructed spin echo signal. The filtering effects of these four algorithms are analyzed while the SNR and the Root Mean Square Error (RMSE) are also calculated out. The results of this experiment and the application of these algorithms show that this improved wavelet filtering algorithm can improve the SNR and enhance the useful signal in dealing with the signal of nuclear magnetic resonance spin echo. Copyright © 2015 Binary Information Press.

关键词： Signal to noise ratio

来源：评论

学校读者我要写书评

暂无评论

Mathematical model and genetic optimization for hybrid flow shop scheduling problem based on energy consumption

Mathematical model and genetic optimization for hybrid flow ...

引用

Chinese control and Decision Conference, CCDC

作者： Xiang Liu Fengxing Zou Xiangping Zhang Department of Automatic Control College of Mechatronics Engineering Automation National University of Defense Technology Changsha Hunan China

Hybrid flow shop scheduling problem (HFSP) is characterized as the scheduling of jobs in a flow shop environment where, at any stage, there may exist multiple machines. Besides the finishing time of the last job, energy consumption is another important factor affecting economy benefit of hybrid flow shop. A mixed-integer nonlinear programming model is established for the HFSP with minimizing the energy consumption, according to the characteristic of HFSP in practice. It is a typical NP-hard combinatorial optimization problem. For solving it efficiently, an improved genetic algorithm is presented. The fitness based on the ranking of the energy consumption of every individual and the self-adaptive mutation operation based on the fitness are adopted. The numerical experiment is carried out on the three-two-three HFSP, and the result indicates that the model is right and the improved algorithm is efficient.

关键词： Energy consumption Job shop scheduling Genetics Genetic algorithms Optimization Encoding Finishing

来源：评论

学校读者我要写书评

暂无评论

Design and Implementation for the Information Integration of Mechanical Manufacturing Enterprises

Design and Implementation for the Information Integration of...

引用

2012 3rd International Conference on Information Technology for Manufacturing Systems(ITMS 2012)

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

Mechanical manufacturing enterprises face numerous choices about *** order to take full advantage of the information, the technologies and methods of implementing information integration should be carefully ***, the developments of its standard protocols are ***, the information integration of mechanical manufacturing enterprises is *** last, an example is provided to illustrate the method of information integration.

关键词： Mechanical Manufacturing Enterprises Information Integration standard interface Office automation System

来源：评论

学校读者我要写书评

暂无评论

Energy Management System for Sustainable Operation of Robot in Disaster Response

Energy Management System for Sustainable Operation of Robot ...

引用

2020 International Conference on Sustainable Energy engineering and Application, ICSEEA 2020

作者： Lee, Min-Fan Ricky Nugroho, Asep Bahrudin Graduate Institute of Automation and Control National Taiwan University of Science and Technology Taipei Taiwan Research Center for Electrical Power and Mechatronics Indonesian Institute of Sciences Bandung Indonesia National Taiwan University of Science and Technology Department of Mechanical Engineering Taipei Taiwan

ISBN: (纸本)9781728188492

The search and rescue (SAR) robot needs a long-endurance energy source to extend the mission. It needs the energy harvesting and management system. One of the options to harvest energy from the environment is to use photovoltaic (PV). However, the energy which is generated by the PV fluctuates. Putting a supercapacitor to the system will solve this shortcoming. Moreover, it also supports the battery to handle abrupt load variations. The proportional-integral and fuzzy logic control (PI-FLC) is adopted to determine the powersharing between the battery and the supercapacitor. The low pass filter (LPF) is added to separate a high and low frequency of the load. The supercapacitor error voltage and the high frequency are employed as the input of FLC and the output of FLC is reference power which will be taken from the supercapacitor. The PI controller will regulate the supercapacitor current approaching reference power that is given by the FLC. The simulation using Simpower toolbox MATLAB is conducted to evaluate comprehensively and it proves that the proposed method can maintain the state of charge (SoC) of supercapacitor in that the desired level i.e 38%. © 2020 IEEE.

关键词： DC-DC power converters Energy management fuzzy logic robot solar energy supercapacitor

来源：评论

学校读者我要写书评

暂无评论

Discrete Fourier Transform based Virtual Constraint control of Powered Ankle-Foot Prosthesis

Discrete Fourier Transform based Virtual Constraint Control ...

引用

International Conference on Robotics and Artificial Intelligence (ICRAI)

作者： Awais Naeem Mohsin Rizwan Hafiz Farhan Maqbool Muhammad Ahsan Ali Raza Syed Abbas Zilqurnain Naqvi Al-Khwarizmi Institute of Computer Science UET Lahore HCR Lab National Center of Robotics and Automation Lahore Pakistan Department of Mechatronics and Control Engineering National Center of Robotics and Automation Lahore Pakistan Department of Mechatronics and Control Engineering UET Lahore Lahore Pakistan

Active prosthetic devices have been controlled using several methods such as Echo control, EMG signal based Position control and Finite State Machine (FSM) based Impedance/Compliance control. This manuscript proposes Virtual Constraint control of active prosthesis which obviates any need for the classification of EMG signals, identification of the gait phase for state switching and potentially avoids an exhaustive procedure for the tuning of impedance parameters. In this paper, a Discrete Fourier Transform (DFT) based Virtual Constraint control is presented to characterize the ankle-foot joint trajectory as a function of the human-inspired phase variable in a unified manner. An optimization-based algorithm is employed for the robust generation of continuously monotonic and linear phase variable for DFT based Virtual Constraint control. The results are generalized across various walking speeds for a specific user during the level ground walking.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Formation tracking for nonlinear agents with unknown second-order locally Lipschitz continuous dynamics

Formation tracking for nonlinear agents with unknown second-...

引用

31st Chinese control Conference, CCC 2012

作者： Xiangke, Wang Jiahu, Qin Xun, Ll Zhiqiang, Zheng College of Mechatronics and Automation National University of Defense Technology Changsha 410073 China Research School of Engineering Australian National University Canberra ACT 2601 Australia Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin 150001 China

ISBN: (纸本)9789881563811

This paper investigates the formation tracking problem for a group of networked agents with second-order unknown locally Lipschitz continuous nonlinear dynamics. By utilizing the ISS (input-to-state stable) notion and backstepping design method, a distributed control strategy is proposed with the aid of graph theory and the cyclic-small-gain theorem. The proposed strategy can drive the positions of the agents to converge to a desired geometric pattern, as well as the position center of the agents to trace a desired trajectory. © 2012 Chinese Assoc of Automati.

关键词： Multi agent systems

来源：评论

学校读者我要写书评

暂无评论

Discrete Sliding Mode control for a Non-minimum Phase Electro-hydraulic Actuator System

Discrete Sliding Mode Control for a Non-minimum Phase Electr...

引用

Asian control Conference

作者： R. Ghazali Y. M. Sam M. F. Rahmat C. C. Soon H. I. Jaafar Zulfatman Center for Robotics and Industrial Automation Faculty of Electrical Engineering Universiti Teknikal Malaysia Melaka Department of Control and Mechatronics Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia

ISBN: (纸本)9781479978632

The main objective of this paper is to perform a robust controller design using discrete-time sliding mode control (DSMC). In the control scheme, two-degree-of-freedom (2-DOF) control strategy turns the DSMC, which generally utilized state feedback into output feedback controller. The designed control scheme is considered with feedback and feedforward combination by implementing the zero phase error tracking control (ZPETC), which particularly intended for the nonminimum phase electro-hydraulic actuator (EHA) system application. In the experimental works, a sinusoidal trajectory with different frequencies is employed to assess the DSMC performance under nonlinear and uncertain condition. Experimental results show the DMSC with perfect tracking control approach is capable to reduce the phase lag occurred due to nonlinear phenomenon. The proposed controller also is highly robust under various points of trajectories and significantly shows enhancement in tracking control performance as compared to the conventional controllers.

关键词： Output feedback control Discrete sliding mode control Zero-phase-error-tracking control Electro-hydraulic actuator system

来源：评论

学校读者我要写书评

暂无评论

Cascade controller Including Backstepping for Hydraulic-Mechanical Systems

引用

IFAC Proceedings Volumes 2012年第8期45卷 310-315页

作者： Martin Choux Geir Hovland Mogens Blanke Mechatronics Group Department of Engineering University of Agder N-4892 Grimstad Norway Automation and Control Group Department of Electrical Engineering Technical University of Denmark DK-2800 Kgs. Lyngby Denmark

Development of a cascade controller structure including adaptive backstepping for a nonlinear hydraulic-mechanical system is considered in this paper where a dynamic friction (LuGre) model is included to obtain the necessary accuracy. The paper compares the performance of two variants of an adaptive backstepping tracking controller with earlier results. The new control architecture is analysed and enhanced tracking performance is demonstrated when including the extended friction model. The complexity of the backstepping procedure is significantly reduced due to the cascade structure. Hence, the proposed control structure is better suited to real-time implementation.

关键词： Hydraulic actuator Lyapunov methods Adaptive control

来源：评论

学校读者我要写书评

暂无评论

Advances in Vision-Based Lane Detection：Algorithms,Integration,Assessment,and Perspectives on ACP-Based Parallel Vision

引用

IEEE/CAA Journal of Automatica Sinica 2018年第3期5卷 645-661页

作者： Yang Xing Chen Lv Long Chen Huaji Wang Hong Wang Dongpu Cao Efstathios Velenis Fei-Yue Wang Advanced Vehicle Engineering Centre Cranfield University Bedford MK43 0AL U.K Vehicle Intelligence Pioneers Ltd Qingdao 266000 China School of Data and Computer Science Sun Yat-Sen University Guangzhou 510275 China Mechanical and Mechatronics Engineering with the University of Waterloo 200 University Avenue West Waterloo ON N2L 3G1 Canada State Key Laboratory of Management and Control for Complex Systems Institute of Automation Chinese Academy of Sciences Beijing 100190 China ieee

Lane detection is a fundamental aspect of most current advanced driver assistance systems(ADASs). A large number of existing results focus on the study of vision-based lane detection methods due to the extensive knowledge background and the low-cost of camera devices. In this paper, previous visionbased lane detection studies are reviewed in terms of three aspects, which are lane detection algorithms, integration, and evaluation methods. Next, considering the inevitable limitations that exist in the camera-based lane detection system, the system integration methodologies for constructing more robust detection systems are reviewed and analyzed. The integration methods are further divided into three levels, namely, algorithm, system,and sensor. Algorithm level combines different lane detection algorithms while system level integrates other object detection systems to comprehensively detect lane positions. Sensor level uses multi-modal sensors to build a robust lane recognition system. In view of the complexity of evaluating the detection system, and the lack of common evaluation procedure and uniform metrics in past studies, the existing evaluation methods and metrics are analyzed and classified to propose a better evaluation of the lane detection system. Next, a comparison of representative studies is performed. Finally, a discussion on the limitations of current lane detection systems and the future developing trends toward an Artificial Society, Computational experiment-based parallel lane detection framework is proposed.

关键词： Advanced driver assistance systems(ADASs) ACP theory benchmark lane detection parallel vision performance evaluation

来源：评论

学校读者我要写书评

暂无评论

Air-ground cooperative exploration of 3D complex environment with maximized visibility and obstacles avoidance

Air-ground cooperative exploration of 3D complex environment...

引用

2021 International Conference on Unmanned Aircraft Systems, ICUAS 2021

作者： Wu, YuXuan Wang, Jing Zhou, Meng Dong, Zhe Chen, YangQuan College of Information Science and Technology Beijing University of Chemical Technology Beijing China School of Electrical and Control Engineering North China University of Technology Beijing China Mechatronics Embedded Systems and Automation Lab University of California MercedCA95343 United States

ISBN: (纸本)9780738131153

Unmanned aerial vehicles (UAVs) can provide vision at high altitude. In this paper, multi-UAVs and ground vehicle are utilized to explore a complex environment with obstacles. The desired UAV formation is proposed around ground vehicle to provide wider vision. The Interfered Fluid Dynamical System (IFDS) method is utilized to guide UAVs avoid obstacles, while the desired formation need be maintained. Then formation control scheme of multi-UAVs is updated to combine with IFDS method according to original formation and obstacles avoidance. Simulation results shows that multi-UAVs can avoid obstacles and maintain the desired formation around ground vehicle during exploration. © 2021 IEEE.

关键词： Ground vehicles

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：