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An online fault pre-warning system of the rolling mill screw-down device based on virtual instrument

Sensors and transducers 2014年第4期168卷 1-7页

作者： Bai, Qing Jin, Baoquan Gao, Yan Zhang, Hongjuan Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education Taiyuan University of Technology No. 79 West Yingze Street Taiyuan Shanxi China

A traditional off-line screw-down monitoring system performs not well on real-time signal analysis or process, which cannot provide simultaneous fault pre-warning either. A diagnostic monitoring system as well as a remotely accessible graphic user interface is presented in this paper. The main objective of this work is to develop an online and available technique for monitoring the kinetic, hydrodynamic and electrical parameters of the rolling mill screw-down device, and analyze these figures to support online fault pre-warning. A series of transducers are installed in suitable locations to measure parameters decried above including the vibration acceleration of a rolling mill stand, the rolling force of a screw-down device, the stroke of a hydraulic cylinder, the system source pressure, the in-cylinder stress and the output value of an electro-hydraulic servo valve. An industrial personal computer picks up the information transformed by an extra high-speed data acquisition board embedded inside, processes the signals via a software designed by means of laboratory Virtual Instrument Engineering Workbench (LabVIEW) and indicates fault conditions through the graphic user interface. Besides, the data of the overall system can be published over the Internet using LabVIEW Web Server capabilities. The results of experiments suggest that the system works well on real-time data acquisition and online fault prewarning. The statistics saved contributes to the research of vibration performance and malfunction analysis of a rolling mill. © 2014. IFSA Publishing, S. L.

关键词： Digital instruments

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Absorption enhancement in organic solar cells based on the plasmonic hot spot effect

Absorption enhancement in organic solar cells based on the p...

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Asia Communications and Photonics Conference, ACP 2013

作者： Zhang, Ye Wang, Wenyan Cui, Yanxia Li, Zhanfeng Ji, Ting Hao, Yuying Key Laboratory of Advanced Transducers and Intelligent Control System College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China

By introducing metallic nanostrips in organic solar cells with the excitation of the plasmonic hot spot effect, we improve light absorption in active layer by 24 % in comparison with the corresponding planar device. &... 详细信息

ISBN: (纸本)9781557529893

关键词： Organic solar cells

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GPR detection of underground void based on low-rank and sparse representation 17

GPR detection of underground void based on low-rank and spar...

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17th International Conference on Ground Penetrating Radar, GPR 2018

作者： Liu, Li Han, Yinping Li, Jingxia Xu, Hang Wang, Bingjie Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781538657775

Underground void detection is important due to its effects on subsidence higher risk. Ground penetrating radar (GPR) is a nondestructive geophysical electromagnetic method and has been widely used in underground void detection or cavities locator. However, because of heavy clutter conditions, the void response is usually obscured. In this paper, an imaging-followed-removal algorithm based on low-rank and sparse representation is presented to suppress the clutter and obtain the void geometrical properties. The proposed algorithm firstly focus the sparsity of the raw data using Frequency-Wavenumber migration imaging method, and then removal the clutter by the robust principle component analysis (RPCA) method. Simulation results of air-filled void, air-water-filled void, and void with pipeline in its side show that our proposed algorithm can remove the dutter efficiently and then the void information can be easily obtained, which is beneficial to further identification. © 2018 IEEE.

关键词： Ground penetrating radar systems

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A novel high energy efficiency electronic control independent variable speed closed circuit steering system for wheel loader 8

A novel high energy efficiency electronic control independen...

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8th IEEE International Conference on Fluid Power and Mechatronics, FPM 2019

作者： Xiangyu, Wang Long, Quan Jing, Yang Jiangjiang, Feng Xiaogang, Zhang Taiyuan University of Technology Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan China

ISBN: (纸本)9781728103112

In order to reduce energy loss of steering system, a high energy efficiency electronic control independent variable speed closed circuit steering principle is proposed. All the hydraulic valves of the original steering system are removed, the required flow of the hydraulic steering cylinder is supplied by the fixed displacement pump, independently and directly. The servo motor speed is set proportional to the steering speed of an independent electric controlled steering wheel. Thus the output flow and the output volume of the pump match with steering speed and the steering angular of the wheel loader, respectively. To verify the feasibility and stability of the steering system during the automatic steering process, firstly, a co-simulation model of proposed steering system is built in the SimulationX software. Then, in order to validate the dynamic characteristics of the steering system, the test prototype of it is established. Finally, energy consumption of new steering systems is analyzed. Based on the results, by using the energy-saving closed circle pump controlled flow matching steering system the throttling loss, the relief loss and the median unloading loss of the steering process are eliminated, the energy consumption is reduced by 61%. A wheel loader can save about 83. 6 L of fuel. If this energy-saving steering system is adopted to all wheel loaders in china, the carbon emissions of 3.3 ∗ 104 T will be reduced per year. © 2019 IEEE.

关键词： Unloading

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Biomechanical Finite Element Methods Study of a Novel Internal Fixation system for Lumbar Spondylolysis

SSRN

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SSRN 2025年

作者： Li, Jingyuan Du, Chengfei Wang, Yulei Du, Di Liang, Jinlong Shao, Nengqi Feng, Fanzhe Xu, Wenhao Xu, Yongqing Cui, Yi Center for Joint Surgery Intelligent Manufacturing and Rehabilitation Engineering Center The First Affiliated Hospital of Army Medical University Chongqing400038 China Chongqing Municipal Science and Technology Bureau Key Laboratory of Precision Medicine in Joint Surgery Chongqing400038 China Chongqing Municipal Education Commission Key Laboratory of Joint Biology Chongqing400038 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of mechanical engineering Tianjin University of Technology Tianjin300384 China Department of Orthopaedic Surgery 920th Hospital of Joint Logistics Support Force Kunming650032 China Department of Orthopaedic Surgery 920th Hospital of Joint Logistics Support Force No. 212 of Da-Guan Road Xishan District Kunming650032 China

ObjectiveThis study aimed to verify the biomechanical efficacy of a novel internal fixation system for repairing lumbar spondylolysis (LS). Additionally, the changes in the mechanical performance of the novel internal fixation device during compression were *** healthy 25-year-old male volunteer was recruited for lumbar spine CT data acquisition to construct and validate a nonlinear finite element model of the L4-S1 spinal segment (A). Based on this, models were established for L5 spondylolysis (B), traditional internal fixation (C), and the pressurization process of the novel LS repair device fixation (D→E→F). For these six models, we constrained the lower surface of the S1 vertebral body while applying an axial compression force of 500 N and a moment load of 7.5 N·m on the upper surface of the L4 vertebral body to simulate six motions of the lumbar spine. The performance of each finite element model was evaluated by comparing the range of motion (ROM), maximum displacement, and maximum pressure experienced by the lumbar spine under different motion *** with Model C, Models D, E, and F exhibited a reduced ROM and maximum displacement (1%-38.5%, 12.8%-63.6%, and 32.8%-80.2%) compared with Model C during six different motions. Notably, compared with Model C, the novel internal fixation models consistently demonstrated a decreasing trend in the maximum stress on the intervertebral discs (IVD) and an increasing trend in the maximum stress on the articular cartilage and maximum stress and displacement of the bone graft. Moreover, the novel internal fixation model displayed larger ranges of evenly distributed stresses on the isthmus and reduced maximum stress on the internal fixation device across all six motions, with improved stiffness effects during the pressurization process of the novel internal fixation system (D→E→F).ConclusionsAccording to several mechanical comparisons, the novel internal fixation system had better biomechan

关键词： Axial compression

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Simulation Study on the controllable Dielectrophoresis Parameters of Graphene

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Chinese Physics Letters 2017年第4期34卷 71-74页

作者： Jian-Long Ji Ya-Li Liu Yang Ge Sheng-Dong Xie Xi Zhang Sheng-Bo Sang Ao-Qun Jian Qian-Qian Duan Qiang Zhang Wen-Dong Zhang Key Lab of Advanced Transducers and Intelligent Control System(Ministry of Education) Taiyuan University of TechnologyTaiyuan 030024 Advanced Coal Mine Machinery and Equipment Collaborative Innovation Center of Shanxi Province Taiyuan University of TechnologyTaiyuan 030024

The method of using dielectrophoresis （DEP） to assemble graphene between micro-electrodes has been proven to be simple and efficient. We present an optimization method for the kinetic formula of graphene DEP, and discuss the simulation of the graphene assembly process based on the finite element method. The simulated results illustrate that the accelerated motion of graphene is in agreement with the distribution of the electric field squared gradient. We also conduct research on the controllable parameters of the DEP assembly such as the alternating current （AC） frequency, the shape of micro-electrodes, and the ratio of the gap between electrodes to the characteristic/geometric length of graphene （λ）. The simulations based on the Clausius-Mossotti factor reveal that both graphene velocity and direction are influenced by the AC frequency. When graphene is close to the electrodes, the shape of micro-electrodes will exert great influence on the velocity of graphene. Also, λ has a great influence on the velocity of graphene. Generally, the velocity of graphene would be greater when λ is in the range of 0.4 0.6. The study is of a theoretical guiding significance in improving the precision and efficiency of the graphene DEP assembly.

关键词： DEP Simulation Study on the controllable Dielectrophoresis Parameters of Graphene

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Band Alignment and Band Gap Characterization of La2O3 Films on Si Substrates Grown by Radio Frequency Magnetron Sputtering

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Chinese Physics Letters 2014年第2期31卷 122-125页

作者：刘其娅方泽波冀婷刘士彦谭永胜谌家军朱燕艳 College of Physics and Electronic Information China West Normal University Nanchong 637002 Department of Physics Shaoxing University Shaoxing 312000 Key Laboratory of Advanced Transducers and Intelligent Control System College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024

La2O3 films are grown on Si （100） substrates by the radio-frequency magnetron sputtering technique. The band alignment of the La203/Si heterojunction is analyzed by the x-ray photoelectron spectroscopy. The valence- band and the conduction-band offsets of La2 Oa films to Si substrates are found to be 2.40±0.1 and 1.66±0.3 eV, respectively. Based on 0 ls energy loss spectrum analysis, it can be noted that the energy gap of La203 films is 5.18±0.2eV, which is confirmed by the ultra-violet visible spectrum. According to the suitable band offset and large band gap, it can be concluded that La2O3 could be a promising candidate to act as high-k gate dielectrics.

关键词： LANTHANUM oxide ENERGY gaps (Physics) MAGNETRON sputtering METALLIC films SILICON SUBSTRATES (Materials science)

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controlled Formation of GaN Nanostructures through Contactless Photoelectrochemical Etching for Supercapacitor Electrode Applications

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International Journal of Electrochemical Science 2025年

作者： Yaya Ge Yihang Fan Yibiao Yang Mingda Zhang Xin Liu Binzhao Cao Yuan Tian Hongming Fei College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan 030024 China

Nanostructured n-type GaN layers were fabricated using the Contactless photoelectrochemical (PEC) etching method in KOH-based solutions under ultraviolet illumination. By adjusting the KOH concentration, distinct surface morphologies were obtained. Low-concentration KOH solutions led to the formation of nanorods at dislocation sites, whereas high-concentration solutions induced interconnected etch pits. Cathodoluminescence (CL) analysis confirmed a strong correlation between the resulting nanostructures and dislocation sites. The formation mechanisms of different nanostructures were discussed. were elucidated. Electrochemical characterization revealed significantly enhanced performance in etched GaN samples. In particular, the GaN layer treated with 0.02 M KOH and 0.02 M K 2 S 2 O 8 exhibited a 16-fold increase in specific capacitance compared to the pristine GaN layer.

关键词： Contactless photoelectrochemical(PEC) etching KOH concentration Dislocations Nanostructures Specific capacitance

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Towards Energy-Efficiency: Integrating MATD3 Reinforcement Learning Method for Computational Offloading in RIS-Aided UAV-MEC Environments

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IEEE Internet of Things Journal 2025年

作者： Wu, Liangshun Zhang, Cong Zhang, Bin Du, Jianbo Qu, Junsuo Key Laboratory of Embedded System and Service Computing Tongji University Ministry of Education Shanghai201804 China Shanghai Key Laboratory of Trustworthy Computing East China Normal University Shanghai201210 China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China Xi'an Key Laboratory of Advanced Control and Intelligent Process School of Automation Xi'an University of Posts & Telecommunications Xi'an710061 China Xinjiang University of Political Science and Law Tumushuke832003 China School of Remote Sensing and Information Engineering Wuhan University Wuhan430079 China Department of Computer City University of Hong Kong 999077 Hong Kong School of Communications and Information Engineering Xi'an University of Posts & Telecommunications Xi'an710061 China

With the proliferation of IoT devices, there is an escalating demand for enhanced computing and communication capabilities. Mobile Edge Computing (MEC) addresses this need by relocating computing resources to the network edge, thereby delivering swifter and more efficient services. This paper introduces a computation offloading and energy consumption optimization framework that leverages Reconfigurable intelligent Surfaces (RIS), Unmanned Aerial Vehicles (UAVs), and MEC. The scheme aims to maximize energy efficiency through the optimization of task allocation, RIS phase shifts, and UAV trajectories. By employing the Multi-Agent Twin Delayed Deep Deterministic Policy Gradient (MATD3) reinforcement learning algorithm, the paper further refines UAV trajectories and RIS configurations. The simulation results indicate that the proposed method surpasses the traditional Concave-Convex Procedure (CCCP) algorithm in both UAV trajectory control and RIS configuration, demonstrating quicker convergence and enhanced stability. The method proves to be adaptable to diverse environments and tasks, showcasing notable benefits in RIS-assisted interference suppression, particularly with large RIS, thereby enhancing UAV data reception rates. Additionally, MATD3 exhibits faster and smoother convergence for extended task durations and smaller RIS scenarios. Simulation results reveal that UAVs tend to move closer to RIS, with energy efficiency falling as IoT tasks increase, affirming the proposed algorithm's high energy efficiency and effectiveness. © 2025 IEEE.

关键词： Unmanned aerial vehicles (UAV)

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An Efficiency Enhanced Graphene/n-Si Schottky Junction for Solar Cells

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Chinese Physics Letters 2018年第7期35卷 58-61页

作者：李刚程宏伟郭丽芳王开鹰程再军 MicroNano System Research Center College of Information and Computer & Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology Taiyuan 030024 School of Optoelectronic and Communication Engineering Xiamen University of Technology Xiamen 361024

A novel and facile oxidation-induced self-doping process of graphene-silicon Schottky junction by nitric acid（HNO3） vapor is reported. The HNO3 oxidation process makes graphene p-type self-doped, and leads to a higher built-in potential and conductivity to enhance charge transfer and to suppress charge carrier recombination at the graphene-silicon Schottky junction. After the HNO3 oxidation process, the open-circuit voltage is increased from the initial value of 0.36 V to the maximum value of 0.47 V, the short-circuit current is greatly increased from 0.80μA to 7.71μA, and the ideality factor is optimized from 4.4 to 1.0. The enhancement of the performance of graphene-Si solar cells may be due to oxidation-induced p-type self-doping of graphene-Si junctions.

关键词： Graphene

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