检索结果-内蒙古大学图书馆

第三十四届中国控制会议

作者： XU Peng WANG Liyang LI Zhijun SU Chun-Yi The Key Lab of Autonomous System and Network Control Ministry of Education and College of Automation Science and Engineering South China University of Technology Department of Electronic Engineering Shunde Polytechnic

ISBN: (纸本)9781467374439

In the paper, a neurodynamic-based energy efficiency optimization strategy(NEE-OS) is proposed to decrease the energy expenditure of robotic manipulators. Different from the traditional approaches, the proposed NEE-OS integrates several necessary constrains from the environment and the robotic manipulator, which could affect energy consumptions of the robotic manipulator in engineering applications to a large extent. To handle the constraints formulated as equalities and inequalities, the energy efficiency optimization problem is converted into a constrained quadratic programming(QP) problem, which is solved using a linear variable inequality-based primal-dual neural network(PDNN) efficiently.

关键词： robotic manipulator,energy optimization,quadratic programming,neural network

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A novel mechanical design of automatic laser targetscoring systems

A novel mechanical design of automatic laser targetscoring s...

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International Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014

作者： Phu, Bui Huu Anh, Nguyen The Binh, Nguyen Thien Dung, Nguyen Quang National Key Lab of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly ThuongKiet Dictrict 10 Ho Chi Minh Viet Nam

ISBN: (纸本)9783038354956

This paper describes mechanical design of automatic target-scoring machine. Automatic target-scoring system use array of laser beams to define coordination of bullet through. The mechanical design accord to modular easy to installation, repair and upgrades. The system includes: emitter module, detector module, adjustment mechanism, and mechanical frame. All modules were design by CAD-CAM and machined by CNC machines to high accuracy In addition, for accuracy using adjustment mechanisms to adjust modules. © (2015) Trans Tech Publications, Switzerland.

关键词： Laser beams

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Variable eccentric distance-based tool path generation for orthogonal turn-milling

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Frontiers of Mechanical engineering 2015年第4期10卷 352-366页

作者： Fangyu PENG Wei WANG Rong YAN Xianyin DUAN Bin LI State Key Laboratory of Digital Manufacturing Equipment andTechnology School of Mechanical Science and Engineering HuazhongUniversity of Science and Technology Wuhan 430074 China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China

This study proposes an algorithm for max- imizing strip width in orthogonal tum-miUing based on variable eccentric distance. The machining error model is first established based on the local cutting profile at the contact line. The influencing factors of the strip width are then investigated to analyze their features and determine an optimizing strategy. The optimized model for maximum machining strip width is formulated by adopting a variable eccentric distance. Hausdorff distance and Fr6chet distance are introduced in this study to implement the constraint function of the machining error in the optimized model. The computing procedure is subsequently provided. Simulations and experiments have been conducted to verify the effectiveness of the proposed algorithm.

关键词： orthogonal turn-milling variable eccentricdistance local cutting profile machining strip-widthmaximization

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Design of shielding system for impulse ground penetrating radar applications

Design of shielding system for impulse ground penetrating ra...

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International Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014

作者： Phuoc, Dong Tan Phu, Bui Huu National Key Lab of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet Dictrict 10 Ho Chi Minh Viet Nam

ISBN: (纸本)9783038354956

In this paper, we propose a shielding system for impulse ground penetrating radar applications (GPR). The structure of shielding system is designed for our real impulse GPR application at 200 MHz central frequency for improving the deep penetration. The shielding system makes high quality of signal transmission from transmitter antenna to receiver antenna for impulse GPR system. It not only makes lowest T/R antenna coupling, high performance of antennas, preventing external noise but also reduces unnecessary air radiation which damages to the health of GPR user. A commercial absorbing material with a short thickness of 40mm is used to reduce the reflection of upper side of antenna in the cavity of shielding system. The design procedure is derived and its performance is explained. Shielding system is designed, simulated and optimized successfully in CST 2013 software. And it is fabricated with good measurement results. © (2015) Trans Tech Publications, Switzerland.

关键词： Ground penetrating radar systems

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Design of rotoformer mechanism and cooling steelconveyor in sulfur granulation systems

Design of rotoformer mechanism and cooling steelconveyor in ...

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International Conference on Machining, Materials and Mechanical Technologies, IC3MT 2014

作者： Binh, Nguyen Thien Son, Le Thanh Nam, Nguyen Thanh The, Vu Ngoc Thanh National Key Lab of Digital Control and System Engineering University of Technology Vietnam National University Ho Chi Minh City 268 Ly Thuong Kiet Dictrict 10 Ho Chi Minh Viet Nam

ISBN: (纸本)9783038354956

The sulfur granulation roller (rotoformer) mechanism and cooling steel conveyor is important clusters in sulfur granulation system. This paper presents method to design rotoformer, apply goal: create a continuous pressure for a regular granulation on steel conveyor. There are also mechanism that granulates and maintains temperature so that sulfur is not stuck and not solidify in the supplying pipes. Moreover, this paper shows the solution to cool the steel conveyor, filter system has temperature sensors which ensure the decreasing of temperature over the length of steel conveyor. This will help the granulation of sulfur, formed sulfur will has right size and shape. © (2015) Trans Tech Publications, Switzerland.

关键词： Sulfur

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A comparative study on D converter based on control schemes of maximum extracted power

A comparative study on D converter based on control schemes ...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： Ahmad El Khateb M.N. Uddin N. A. Rahim Barry W. Williams Automatic Control and Human-Machine Systems LAMIH UMR/CNRS Valenciennes France Electronic Engineering Department Tsinghua University Tsinghua National Laboratory for Information Science and Technology (TNList) Beijing P. R. China Shenzhen City Key Laboratory of Digital TV System Valeo Powertrain Systems Amiens France National Engineering Lab. for DTV(Beijing) Beijing P. R. China

ISBN: (纸本)9781479983988

This paper presents analysis and control of D converter, which has continuous input and output current to obtain maximum power transfer from a photovoltaic (PV) system. Examining the maximum power involves optimization and control techniques that ensure maximum power extraction enhancement. Traditional converters have rather high input ripple current that originates considerable loss of power extraction when linked to photovoltaic panels. Operating with zero input ripple current enlarges the power obtained from the PV panel without employing electrolytic capacitor. Experiment and simulation of the converter performance support and extol the system concept and establish a balanced view among several types of used controllers as well.

关键词： Inverters Capacitors Photovoltaic systems Radiation effects control systems Fuel cells

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MoS2 heterostructure with tunable phase stability: Strain induced interlayer covalent bond formation

arXiv

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arXiv 2017年

作者： Ouyang, Bin Xiong, Shiyun Yang, Zhi Jing, Yuhang Wang, Yongjie National Center for Supercomputing Applications University of Illinois at Urbana-Champaign UrbanaIL61801 United States Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou JiangSu215123 China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan ShanXi030024 China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan ShanXi030024 China Department of Astronautical Science and Mechanics Harbin Institute of Technology Harbin Heilongjiang150001 China Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Electrical Engineering and Computer Engineering University of Michigan Ann ArborMI48109 United States

Due to the distinguished properties offered by different structural phases of monolayer MoS2, phase engineering design are urgently required for achieving switchable structural phase. Strain engineering is widely accepted as a clean and flexible method, however, can not be achieved in engineering monolayer MoS2 phase transition because the critical biaxial strain required (~15%) is much larger than measured elastic limit (~11%). In this study, employing density functional theoretical calculations, it has been found out that with the forming of heterostructure between MoS2 with buckled 2D materials such as silicence, germanene and stanene, only a small strain can trigger the phase transition. As being suggested by the constructed phase stability diagram, biaxial deformation as low as 3% in MoS2/silicene and MoS2/stanene sandwich structure, would be sufficient to induce the structural phase transition in MoS2 lattice. This strain falls well within experimental elastic limit, thus would be feasible to realize in experiment. The origin of such behavior can be understood as strain induced interlayer covalent bond formation, which finally make MoS2 lattice more sensitive to external strain. This theoretical work provides one realistic route for achieving flexible phase stabilities in experimental design. Copyright © 2017, The Authors. All rights reserved.

关键词： Molybdenum compounds

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Experimental study of Tunnel and Anisotropic Magnetoresistive sensor for power system magnetic field measurement applications 3

Experimental study of Tunnel and Anisotropic Magnetoresistiv...

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3rd IEEE International Conference on Smart Instrumentation, Measurement and Applications, ICSIMA 2015

作者： Khawaja, Arsalan Habib Huang, Qi Lian, Libo Sichuan Key Lab of Power System Wide-area Measurement and Control School of Energy Science and Engineering University of Electronic Science and Technology Chengdu China

ISBN: (纸本)9781467372558

This experimental investigation is focused to assess a Tunnel Magneto-Resistive (TMR) and Anisotropic Magneto-Resistive (AMR) sensor for power system magnetic field measurement applications as in current sensing, transmission line monitoring, detection and classification of Transient Magnetic Field (TMF) interference in substations. For measurement applications, AMR sensors have the limitations of low field range up to ±6 Gauss impractical for high magnetic field measurements, disorientation in sensitivity at exposure to field over ±20 Gauss recurrent in outdoor applications and high power consumption not appealing for portable devices. Thus, a complete testing system is established to identify if TMR sensors are a superior candidate for our application domain. For this, both of the sensors were exposed to uniform and transient magnetic field. Experimentation with identical conditioning circuitry confirms the superior performance of TMR sensor over AMR sensor in terms of twice the sensitivity, 200 times reduced power consumption and 5 times more field range. Additionally, in a TMF event, AMR sensor response depicts a time lag of 15 microseconds whereas TMR sensor only lags by 10 nanoseconds. Magnetic fields above field range of AMR sensor disorient the sensor until recalibrated;to cater for this a practical recalibration pulse blinds the sensor for 4 milliseconds once initiated. © 2015 IEEE.

关键词： Anisotropy

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Utilizing Fullerenols as Surfactant for Carbon Nanotubes Dispersions Preparation

Journal of Materials

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Journal of Materials 2017年第1期2017卷

作者： Jianlong Ji Chang Qiao Yali Liu Wendong Zhang Shengbo Sang Xing Yang Aoqun Jian Qianqian Duan Qiang Zhang Ying Liu Micro Nano System Research Center Key Lab of Advanced Transducers and Intelligent Control System of the Ministry of Education College of Information Engineering Taiyuan University of Technology Taiyuan 030024 *** Advanced Coal Mine Machinery and Equipment Collaborative Innovation Center of Shanxi Province College of Information Engineering Taiyuan University of Technology Taiyuan 030024 *** MEMS Laboratory Department of Precision Instruments and Mechanology Tsinghua University Beijing 100084 *** College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 ***

Dispersions of individual carbon nanotubes (CNTs) are crucial for nanodevices and polymer/CNTs nanocomposites. In this paper, stable and homogenous dispersions of individual multiwalled carbon nanotubes (MWCNTs) have been synthesized. The factors influencing the dispersibility mechanism, including the surfactant concentration and the pH value, have been investigated. SEM images display the impurities sticking on MWCNTs which have been removed. The oxygen-containing groups on the surface of MWCNTs sample have been detected through FT-IR and Raman spectra. All experimental results illustrate that using fullerenols as surfactant can greatly improve the dispersibility of MWCNTs. Moreover, the prepared dispersions exhibit good stability that the sediment percentage of fullerenols-MWCNTs is only 5.2% after 5 days.

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Fan Fault Diagnosis Based on Wavelet Spectral Analysis

Fan Fault Diagnosis Based on Wavelet Spectral Analysis

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第三十四届中国控制会议

作者： Wen Zheng Wang Pu Gao Xuejin Zhang Yachao College of Electronic and Control Engineering Beijing University of Technology Engineering Research Center of Digital Community Ministry of Education Beijing Laboratory For Urban Mass Transit Beijing Key Laboratory of Computational Intelligence and Intelligent System

ISBN: (纸本)9781467374439

Fan plays an irreplaceable role in the ventilation of underground environment. It will cause serious consequences once the fan fails. So it is essential to do fault diagnosis of fan to prevent the emergence of break down. Spectral analysis method is a simple and effective method for signal analysis and it has been widely used in fault diagnosis of rotating machinery. This paper has researched the bearing fault of fan on the base of in-depth study of the frequency characteristics of typical faults fan. High-frequency noise of vibration signal has been removed through wavelet soft thresholding method. Get its spectrum characteristic of the reconstructed signal, and then the failure category of signal is discriminated by comparing its characteristic frequency to typical faults frequency in theory. Combining the advantage of lab VIEW and MATlab, we implement the algorithm through two of them, accomplishing denoising and spectral analysis of vibration signals, completing fault diagnosis of fan.

关键词： Fan Fault Diagnosis,Wavelet Denoising,Spectral Analysis

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