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Singularity detection of magnetic memory signal of steel-cord conveyor belt

Telkomnika - Indonesian Journal of Electrical Engineering 2013年第9期11卷 4904-4910页

作者： Tiezhu, Qiao Xiaolu, Li Xueying, Zhang Education Ministry Key Lab of Advanced Transducers and Intelligent Control System Taiyuan University of Technology Taiyuan 030024 China College of Information Engineering Taiyuan University of Technology Taiyuan 030024 China

Metal magnetic memory technology was an important method for detecting the steel-cord conveyor belt early fault, characteristics of magnetic memory signal extraction is critical for judging of the conveyor belt failure. Generally using of magnetic memory signal maximum gradient value can quickly judge the stress concentration zone, but the magnetic memory signal is susceptible to effected by environmental and noise;In view of the weak and non-stationary characteristics of magnetic memory signal, this paper has proposed the singularity detection method based on wavelet transform modulus maximum for metal magnetic memory signal, the method could exactly judged the stress concentration zone of joints and located the fault points of the steel-cord belt, the characteristic gradient of magnetic memory signal and the Lipschitz exponent were extracted. The result of simulation indicated the technology was effectively for judging the stress concentration zone and fault point. © 2013 Universitas Ahmad Dahlan.

关键词： Signal detection

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Initial-Parameter-Criterion based Gaussian Mixture Model Monitoring Method for Non-Gaussian Process

Initial-Parameter-Criterion based Gaussian Mixture Model Mon...

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Chinese control Conference

作者： Ying Tian Wenli Du Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology Shanghai Key Laboratory of Advanced Control and Optimization for Chemical Processes East China University of Science and Technology Shanghai

Gaussian mixture model (GMM) monitoring method is commonly used for non-Gaussian process monitoring. In GMM monitoring method, the final number of Gaussian components and the statistical distribution parameters are estimated through the improved Figueiredo-Jain (F-J) algorithm in the modeling phase. However, the data dimensionality of modern industry is high, the number of initial Gaussian components is large for the accuracy of the algorithm. Under this condition, the relative small number of samplings makes the denominator in the weight estimation formula of the improved F-J algorithm become zero and the algorithm suspends. To make the algorithm work well in an acceptable modeling time, we deduce the Initial-Parameter-Criterion among initial Gaussian components, data dimension, sampling number and propose the Initial-Parameter-Criterion based GMM (IPC-GMM) monitoring method. The proposed monitoring method is used for TE process monitoring, simulation results reveal the effectiveness and necessity of IPC-GMM monitoring method.

关键词： Monitoring Gaussian mixture model Density functional theory Industries Data models Process control

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In situ SERS monitoring of photocatalytic organic decomposition using recyclable TiO2-coated Ag nanowire arrays

In situ SERS monitoring of photocatalytic organic decomposit...

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作者： Bao, Zhi Yong Liu, Xin Dai, Jiyan Wu, Yucheng Tsang, Yuen Hong Lei, Dang Yuan Department of Applied Physics Hong Kong Polytechnic University Hong Kong Hong Kong Key Lab of Advanced Transducers and Intelligent Control System of Ministry of Education College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan China Shenzhen Research Institute Hong Kong Polytechnic University Shenzhen Hong Kong College of Material Science and Engineering Hefei University of Technology Hefei China

Recently, semiconductor and noble metal complex nanomaterials have attracted ever-increasing attention because of the realization of multiple functionalities in a single entity. In this study, Ag-TiO2 core-shell nanocomposites were synthesized by hydrolysis of butyl titanate on the surface of Ag nanowires. Due to efficient electron transfer at the Ag-TiO2 interface, the as-prepared nanocomposites exhibit much higher photocatalytic activity than bare TiO2 films, as demonstrated by the enhanced photodegradation rate of R6G and methyl blue molecules. In the meanwhile, such nanocomposites serve as a high-sensitivity surface-enhanced Raman scattering (SERS) substrate for in situ monitoring of the photocatalytic decomposition reaction, and the substrate is recyclable due to its self-cleaning function. Full-wave numerical calculations reveal that the improved photocatalysis and SERS efficiencies are attributed to the largely enhanced electromagnetic near-field in the nanocomposites. Our results point out that bifunctional semiconductor-metal hybrids hold great promise for simultaneously detecting and decomposing organic pollutants in the environment. © 2014 Elsevier B.V. All rights reserved.

关键词： Titanium dioxide

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Comparison of feedback linearization and flatness control for anti-slip regulation (ASR) of an hybrid vehicle: From theory to experimental results

Comparison of feedback linearization and flatness control fo...

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European control Conference (ECC)

作者： Cedric Chapuis Eric Bideaux Xavier Brun Nicoleta Minoiu-Enache Vehicle Control Team at Renault SAS Research Automatic Control and Mechatronic Team at Ampere Lab UMR CNRS 5005 Guyancourt France Head of Methods of System Engineering Department Ampere Lab UMR CNRS 5005 Villeurbanne Cedex France Vehicle Control Team at Renault SAS Research Advanced Engineering Department Guyancourt France

This paper compares 3 ASR 1 control laws, a PI controller, a linearizing feedback and a flatness based control. First, the controllers are designed based on a two state equations vehicle model. Then, the controllers are experimentally validated on an hybrid vehicle (VELROUE) with rear electric wheels and front axle ICE 2 traction. Finally, the nonlinear control laws are compared to the PI controller that is classically used in the automotive industry.

关键词： Wheels Vehicles Torque Acceleration Vehicle dynamics Force Roads

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Optimization on Weighting Factors of Model Predictive control Based on Fuzzy Technique for Linear Induction Machine

Optimization on Weighting Factors of Model Predictive Contro...

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2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020

作者： Tang, Lei Wang, Xiaoguang Xu, Wei School of Electrical Engineering Southwest Jiaotong University Chengdu611756 China Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan430068 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781728152158

Compared with direct thrust control and vector control methods, the model predictive control (MPC) is recognized as a more effective approach. However, the weighting factors in the objective function must be tuned, which greatly increases the computation burden. In this work, based on the fuzzy technique, one weighting factor optimization method is proposed to identify the suitable control action for the linear induction machine (LIM), which can effectively simplify the selection process. At last, comprehensive simulation results have demonstrated the excellent performance of the proposed method. © 2020 IEEE.

关键词： Model predictive control

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Experimental demonstration of a thermal-EM concentrator for enhancing EM signals and converging heat fluxes simultaneously

arXiv

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arXiv 2024年

作者： Chen,, Hanchuan Liu,, Yichao Sun,, Fei Sun, Qianhan Wu,, Xiaoxiao Sun, Ran Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan030024 China Guangzhou510000 China

Simultaneously concentrating EM waves and heat fluxes to the same target region within an on-chip system carries substantial academic research importance and practical application value. Nevertheless, existing researches are primarily aimed at the design and experimentation of concentrators for individual EM waves or temperature fields. In this work, a thermal-EM concentrator, capable of simultaneously concentrating EM waves and heat fluxes, is designed using transformation optics/thermodynamics and fabricated with engineered EM-thermal metamaterials. The concentrating effects of the proposed thermal-EM concentrator on the thermal fluxes and EM waves are verified through numerical simulations and experimental measurements, respectively, which are in good agreement with each other. Both numerically simulated and experimentally measured results demonstrate the concentrating capability of the proposed thermal-EM concentrator, which can concentrate broadband TM-polarized EM waves ranging from 8-12 GHz and heat/cold flows to the same target region within an on-chip operating environment. The thermal-EM concentrator exhibits a thermal focusing efficiency close to 100% and more than three times enhancement of the magnetic field at the designed center frequency of 10 GHz. The proposed thermal-EM concentrator can be utilized for efficient cooling for the specified component and simultaneously enhancing the EM antenna's radiation/reception efficiency within an on-chip system. Copyright © 2024, The Authors. All rights reserved.

关键词： Heat flux

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Static Output Feedback Design to Achieve Phase Stabilization of Bending Mode

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IFAC Proceedings Volumes 1998年第21期31卷 347-352页

作者： C.B. Asthana M.S. Bhat K.N. Swamy Scientist Control System Lab. Research Centre Imarat Hyderabad - 500058. Associate Professor Aerospace Department Indian Institute of Science Bangalore - 560012. Scientist Advanced Tech. Cell Indian Institute of Science Bangalore - 560012.

The quadratic optimal output feedback solution is found by iteratively satisfying the equations arising from the necessary condition for optimality. A simple, suboptimal solution is derived from the necessary condition which offers acceptable solution without any iterations. This is applied to design a pitch acceleration tracking autopilot for a flexible missile employing wing and tail as two independent control surfaces. It is shown that a matrix of static gains alone, apart from meeting the other design specifications, phase stabilizes the first bending mode and gain stabilizes higher bending modes.

关键词： output feedback static controllers suboptimal phase stability tracking systems missiles

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HALS-770 interlayer simultaneously block internal and external degradation paths of perovskite for stability and high efficiency perovskite solar cells

HALS-770 interlayer simultaneously block internal and extern...

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第十一届新型太阳能材料科学与技术学术研讨会

作者： Lina Hu Chenxi Zhang Yukun Wu Shiqi Li Fan Zhang Jingkun Ren Yang Hao Qinjun Sun Yulin Wang Yuying Hao College of Electronic Information and Optical Engineering Key Lab of Advanced Transducers and Intelligent Control SystemTaiyuan University of Technology School of Physics and Optoelectronic Engineering Faculty of Information Science and EngineeringOcean University of China

The stability of perovskite solar cells （PSCs） is a major problem limiting their ***,we proposed a feasible solution using bis（2,2,6,6-tetramethyl-4-piperidyl） sebacate（HALS-770） as top protection layer of ***-770 interlayer can not only improve the antioxidant ability of perovskite by removing superoxide (O) with help of hindered amine groups,but also suppress the internal and external degradation path of perovskite due to the co-existence of hydrophilic and hydrophobic ***,it can block volatilization of organic cation and the migration of Agand I,thus improve thermal stability of perovskite and alleviate destruction of Ag *** addition,the heterocycles N atom and carbonyl group in HALS-770 interact with the under-coordinated Pb,reducing the interface *** a result,the unencapsulated device maintains excellent stability over95%of its initial efficiency after 30 days in ambient condition with about 25–50%humidity,and possesses remarkable continuous operation stability with projected T80>1400 h at maximum power point tracking in glove box,much higher than those of the pristine ***,HALS-770 enable the PCE of 21.88%for PSC （0.06 cm）,which is among the highest efficiencies for MAPbI based PSCs with p-i-n structure,and the PCE of 19.07%for PSM （4 cm）.And it is also suitable for FAMA-based devices with n-i-p structure,enabling an efficiency of 23.03%（0.06 cm） and excellent stability.

关键词： Perovskite solar cell External degradation Internal degradation Stability

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Tunable uniform field enhancement in a subwavelength air pillar by photonic doping in epsilon-near-zero medium

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Results in Physics 2024年 61卷

作者： Sun, Fei Shan, Jinyuan Liu, Yichao Zhao, Xiaodan Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province College of Electronic Information and Optical Engineering Taiyuan University of Technology Taiyuan 030024 China

In this study, a novel electric field compressor is proposed by doping a metal-air-metal pillar in epsilon-near-zero medium within a metallic waveguide, which effectively enhances the background electric fields in a sub-wavelength air pillar with high uniformity. The field enhancement factor can be analytically determined through theoretical derivations from Maxwell's equations, reaching its maximum value by appropriately selecting the size of the air pillar. Furthermore, the proposed compressor can achieve a tunable electric field enhancement effect within the deep sub-wavelength air pillar by adjusting the height of the air pillar through movement of two metal pillars inserted into the waveguide. Both theoretical analysis and numerical simulations are employed to validate the performance of the electric field compressor, which exhibits a wide range of tunable field enhancement effect (i.e., continuously adjustable enhancement factor between 20 and 800) with uniformity below 1.5 within the deep sub-wavelength air pillar (wherein the air volume is smaller than λ₀/10 × λ₀/10 × λ₀/16). Finally, a practical model is proposed for the realization of the electric field compressor in the microwave range, where specially placed metal pillars and wires are incorporated into a rectangular metallic waveguide structure. The field enhancement and tunable effects of this practical model have been verified through simulations. © 2024

关键词： Epsilon-near-zero medium Photonic doping Subwavelength field confinement Tunable enhancement

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Structure Design and Analysis of Reconfigurable Fixture Robot Based on the Auto-body Panels

Structure Design and Analysis of Reconfigurable Fixture Robo...

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IEEE International Conference on Mechatronics and Automation

作者： Jilong Li Jun Liu Xiaofeng Wang Weimin Ge School of Mechanical Engineering Tianjin University of Technology Tianjin Key Laboratory of the Design and Intelligent Control of the Advanced Mechatronical System Xiqing District Tianjin China Tianjin Key Lab. of the Design & Intell. Control Adv. Mechatronical Syst. Tianjin China

The fixture is an important equipment, and is widely used in the auto-body panels to be assembled and welded. However, most fixtures, which installed on the production lines, are special to make the production cost higher and the production efficiency lower. Therefore, the reconfigurability of the fixture becomes a key factor that effects the production efficiency of automobiles. To handle the above problems, the new reconfigurable fixture robot is proposed in this paper, which can meet the handing, assembling and welding requirements of different automobile's sheet parts on the automobile production lines. First, the three-dimensional model and the kinematic equations of the proposed reconfigurable fixture robot are established. Then, the working space of the reconfigurable fixture robot is also obtained. Finally, the modal analysis of the reconfigurable fixture robot is performed to determine the cause of resonances. Reconfigurable fixture robots are capable of gripping the auto-body panels with the different radii of curvature, which can also meet the work scopes on the production lines.

关键词： Fixtures Manipulators Kinematics Modal analysis Clamps

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