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Polyamorphism mediated by nanoscale incipient concentration wave uncovering hidden amorphous intermediate state with ultrahigh modulus in nanostructured metallic glass

材料展望（英文）

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材料展望（英文） 2023年第2期 123-133页

作者： Qiang Luo Weiran Cui Huaping Zhang Liangliang Li Liliang Shao Mingjuan Cai Zhengguo Zhang Lin Xue Jun Shen Yu Gong Xiaodong Li Maozi Li Baolong Shen School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing 211189People's Republic of China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049People's Republic of China University of Chinese Academy of Sciences Beijing 100049People's Republic of China Institute of Physics Chinese Academy of SciencesBeijing 100190People's Republic of China Department of Physics Renmin University of ChinaBeijing 100872People's Republic of China Inner Mongolia University of Science & Technology Baotou 014010People's Republic of China College of Mechatronics and Control Engineering Shenzhen UniversityShenzhen 518060People's Republic of China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049People's Republic of China Department of Physics Renmin University of ChinaBeijing 100872People's Republic of China

Comprehending the pressure-/temperature-induced structural transition in glasses,as one of the most fascinating issues in material science,is far from being well ***,we report novel polyamorphic transitions in a Cu-based metallic glass(MG)with apparent nanoscale structural heterogeneity relating to proper Y *** low-density MG compresses continuously with increasing pressure,and then a compression plateau appears after～8.1 GPa,evolving into an intermediate state with an ultrahigh bulk modulus of～467 *** then transforms to a high-density MG with significantly decreased structural heterogeneity above～14.1 ***-dimensional atom probe tomography reveals concentration waves of Cu/Zr elements with an average wavelength of～5-6 nm,which promote the formation of interconnected ringlike networks composed of Cu-rich and Zr-rich dual-glass domains at nanometer *** experimental and simulation results indicate that steplike polyamorphism may stem from synergic effects of the abnormal compression of the Zr-Zr bond length at the atomic scale and the interplay between the applied pressure and incipient concentration waves(Cu and Zr)at several nanometer *** present work provides new insights into polyamorphism in glasses and contributes to the development of high-performance amorphous materials by high-pressure nanostructure engineering.

关键词： metallic glasses heterogeneity concentration wave polyamorphism

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Simulation of Wind Turbine Vibrations

Simulation of Wind Turbine Vibrations

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International Workshop on Electric Drives: Optimization in control of Electric Drives (IWED)

作者： Ekaterina Andriushchenko Ants Kallaste Toomas Vaimann Anton Rassõlkin Hamidreza Heidari Galina L. Demidova Department of Electrical Power Engineering and Mechatronics Tallinn University of Technology Tallinn Estonia Faculty of Control Systems and Robotics ITMO University St. Petersburg Russia

ISBN: (数字)9781728141589

ISBN: (纸本)9781728141596

In recent years, there has been an increasing interest in renewable energy. Particularly, wind energy is gaining more and more popularity in many countries. However, the main obstacles to wind turbines usage are the vibration and noise close to wind farms. Therefore, this paper is focused on developing a new method for mathematical simulation of vibrations of a wind turbine in order to find out and reduce the vibration level. Particularly, low-frequency vibration of a wind turbine, composed of a tower and rotor in the out-of-balance condition is considered. The proposed method of vibration simulation is based on the theory of elastic beams and the general vibration theory. The calculations are made for a wind turbine VTR 50 Arctic. The results of the calculations are the displacement of the tower top and the stress at the tower foundation. Furthermore, it is worth emphasizing that the method is quite flexible. It allows adding complexity into the system, for instance, external loads such as wind pressure, aerodynamic loads, seismic loads or operational loads.

关键词： Wind turbines Poles and towers Vibrations Rotors Mathematical model Stress Blades

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Fabrication of microgrooves by EDM using a laminated disc electrode consisted of different material foils

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Procedia CIRP 2020年 95卷 578-583页

作者： Jianguo Lei Xiaoyu Wu Bin Xu Likuan Zhu Zhiwen Zhou Dengji Guo Kai Jiang Yonghua Zhao Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control Engineering Shenzhen University Nan-hai Ave 3688 Shenzhen 518060 Guangdong China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen 518055 Guangdong China

Different material tool electrodes exhibit various wear rates in electrical discharge machining (EDM). To make full use of such characteristic, in the present study, different materials disc foils including Cu, Cu-Sn alloy and Sn disc foils were used to construct a laminated disc electrode (LDE) blank, performing EDM to fabricate LDE with stable micro channels on the outer edge surface, and then the LDE was applied in EDM to produce microgrooves on workpieces with the same machining conditions. The wear difference between the single disc foil electrode and the corresponding disc foil in the LDE blank, and the WV-EDM formation of the LDE were studied, respectively. The experimental results show that not all the wear patterns of disc foils in the LDE were equivalent to the single disc foil electrodes due to the protection effect between the foils. This method could effectively fabricate the LDEs with stable micro channels on the outer surfaces. During the WV-EDM process of the LDEs, Cu disc foils with lower wear rates exhibited significant protection and wear resistance effects on the adjacent Cu-Sn alloy disc foils, while the latter provided supportive and stabilized effect in return. Finally, based on the proposed method, the array LDEs composed of Cu disc foils, Cu-Sn alloy disc foils and Sn disc foils were obtained and then used in EDM, the microgroove structures and micro-columnar structures were machined on the surface of titanium alloy.

关键词： Laminated disc electrode EDM Wear Microgroove Protective effect Supportive effect

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Experimental Prototype of High-Efficiency Wind Turbine Based on Magnus Effect

Experimental Prototype of High-Efficiency Wind Turbine Based...

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International Workshop on Electric Drives: Optimization in control of Electric Drives (IWED)

作者： Aleksandr Lukin Galina L. Demidova Dmitry V. Lukichev Anton Rassõlkin Ants Kallaste Toomas Vaimann Anouar Belahcen Faculty of Control System and Robotics ITMO University Saint Petersburg Russia Department of Electrical Power Engineering and Mechatronics Tallinn University of Technology Tallin Estonia Department of Electrical Engineering and Automation Aalto University Helsinki Finland

ISBN: (数字)9781728141589

ISBN: (纸本)9781728141596

The main feature of Magnus wind turbine is the ability to produce energy at low wind speed. This benefit lets to use such types of turbines in smart homes, which are an important part of the development of distributed energy systems, growth of blockchain electricity technology and needs for duplication of the solar energy system in the private buildings. This paper presents topology of two cylinders Magnus wind turbine in order to ensure the highest values of power coefficient and the Magnus force. The optimal ratio of wind speed and cylinder rotation speed were detected to eliminate the oscillations caused by the Von Karman vortex street phenomenon.

关键词： Wind turbines Force Drag Rotors Mathematical model Wind speed Generators

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Magnus Wind Turbine: Finite Element Analysis and control System

Magnus Wind Turbine: Finite Element Analysis and Control Sys...

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International Symposium on Power Electronics, Electrical Drives, Automation and Motion, SPEEDAM

作者： Galina L. Demidova Alecksey Anuchin Aleksandr Lukin Dmitry Lukichev Anton Rassõlkin Anouar Belahcen Faculty of Control System and Robotics ITMO University Saint-Petersburg Russia Department of Electrical Power Engineering and Mechatronics Tallinn University of Technology Tallinn Estonia Department of Electrical Engineering and Automation Aalto University Helsinki Finland

ISBN: (数字)9781728170190

ISBN: (纸本)9781728170206

Due to its special features, the Magnus effect wind turbine allows you to produce energy at a very low speed of the wind. This fact, as well as the growing interest in the of blockchain technology, makes it possible to use this type of wind turbine in private household as part of a distributed energy system in addition to solar panels. The article describes a two blades Magnus wind turbine whose cylinders rotate by means of embedded motors. To avoid a von Karman vortex street effect that occur when the cylinders rotate in the air flow, as well as to ensure maximum power, the optimal ratio between the wind speed and the cylinder rotation speed is determined using finite element analysis. Further, the obtained relations are used in the algorithms of the wind turbine control system.

关键词： Wind turbines Force Wind speed Generators Mathematical model Torque control systems

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Self-Tuning Clamping Force control with Optimal Trajectory Tracking for Autonomous Pipe Inspection Robots

SSRN

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SSRN 2025年

作者： Sun, Guoxin Xia, Longfei Du, Xinpeng Yu, Qihui Zhang, Jianlong Qin, Ripeng School of Mechanical Engineering Inner Mongolia University of Science and Technology Inner Mongolia Autonomous Region Baotou014010 China Inner Mongolia Engineering Technology Research Center of Mechatronics System Intelligent Diagnosis & Control Engineering 014010 China Inner Mongolia Ming yang North Smart Energy Research and Development Center Co LTD China Department of Mechanical Engineering Denmark Inner Mongolia University of Science and Technology China

In response to the limitations of existing external pipe-crawling robots, which are unable to automatically adjust clamping force during operation, a novel external pipe-crawling robot has been designed. To enable adaptive clamping based on varying pipeline conditions, an adaptive clamping force control method based on optimal speed curve tracking is proposed. First, the target clamping force is calculated according to pipeline conditions, and it is then converted into a target speed signal through optimal speed curve planning. Subsequently, the motor precisely tracks the speed signal to achieve accurate clamping force control. Experimental results from the robot prototype demonstrate that the proposed algorithm maintains a clamping force control error rate of less than 8.0% under pipelines with different diameters, inclination angles, and surface roughness, ensuring stable operation across various pipeline conditions. © 2025, The Authors. All rights reserved.

关键词： Clamping devices

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Microstructural evolution and mechanical properties of selective laser melted Ti-6Al-4V induced by annealing treatment

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Journal of Central South University 2021年第4期28卷 1068-1077页

作者： WANG Pei CHEN Feng-hua J.ECKERT S.PILZ S.SCUDINO K.G.PRASHANTH Additive Manufacturing Institute College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China Erich Schmid Institute of Materials Science Austrian Academy of SciencesJahnstraße 12A-8700 LeobenAustria Departmentof Materials Science Chair of Materials PhysicsMontanuniversität LeobenJahnstraße 12A-8700 LeobenAustria Institute for Complex Materials Leibniz IFW DresdenHelmholtzstraße 20D-01069 DresdenGermany Department of Mechanical and Industrial Engineering Tallinn University of TechnologyEhitajete tee 519086 TallinnEstonia CBCMT School of Mechanical EngineeringVellore Institute of TechnologyVellore-632014Tamil NaduIndia

Ti-6Al-4V specimens were fabricated by selective laser melting(SLM)to study the effect of thermal treatment on the phase transformation,elemental diffusion,microstructure,and mechanical *** results show that vanadium enriches around the boundary ofαphases with increasing annealing temperature to 973 K,andα′phases transform intoα+βat 973 *** typicalα′martensite microstructure transforms to fine-scale equiaxed microstructure at 973 K and the equiaxed microstructure significantly coarsens with increasing annealing temperature to 1273 *** SLM Ti-6Al-4V alloy annealed at 973 K exhibits a well-balanced combination of strength and ductility((1305±25)MPa and(37±3)%,respectively).

关键词： selective laser melting Ti-6Al-4V annealing treatment microstructure mechanical properties

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Analysis the effect of 500kv High-Voltage Power Transmission Line on the Output Efficiency of Solar-Panels 1

Analysis the effect of 500kv High-Voltage Power Transmission...

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1st International Conference on Electrical, Communication and Computer engineering, ICECCE 2019

作者： Raza, Hafiz Ahmad Riaz, Muhammad Tanveer Idrees, Muhammad Afzal, Muhammad Muneeb Hashmi, Wajahat Saleem Asif, Muhammad Waleed School of Electrical Engineering University of Faisalabad Faisalabad38000 Pakistan UET Lahore Dept. of Mechatronics and Control Engineering Faisalabad38000 Pakistan Riphah International University Department of Electrical Engineering Faisalabad38000 Pakistan

ISBN: (纸本)9781728138251

A significant problem that is not discussed in the latest research in the field of the solar energy system that is the Influence of 500kv HV power transmission line (TL) on the O/P power generation of solar panel situated nearby the 500kv high voltage TL. Meanwhile, grid-tied solar power generating stations, usually are situated nearby HV power TL, hence this problem is critical and wants to take the attention of researchers. So, therefore, this investigation address, the complete hypothetical study and it is verified through a practical experiment that is performed under and near the TL. The results of this investigation demonstrate the influence of electric and magnetic fields originated by a 500kv HV TL on O/P power of solar panel situated near HV TL. Moreover, this is also studied that what happens, when increasing the distance among solar panel and conductors of TL, and when a load of transmission line goes low to high. In the end, for achieving high efficiency from the solar panel, the lowest distance w investigated between solar panels and conductors of 500kv TL. © 2019 IEEE.

关键词： Electric fields

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A spontaneous driver emotion facial expression (DEFE) dataset for intelligent vehicles

arXiv

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arXiv 2020年

作者： Li, Wenbo Cui, Yaodong Ma, Yintao Chen, Xingxin Li, Guofa Guo, Gang Cao, Dongpu School of Automotive Engineering Chongqing University Chongqing400044 China Department of Mechanical and Mechatronics Engineering University of Waterloo WaterlooONN2L 3G1 Canada Institute of Human Factors and Ergonomics College of Mechatronics and Control Engineering Shenzhen University Shenzhen Guangdong518060 China

In this paper, we introduce a new dataset, the driver emotion facial expression (DEFE) dataset, for driver spontaneous emotions analysis. The dataset includes facial expression recordings from 60 participants during driving. After watching a selected video-audio clip to elicit a specific emotion, each participant completed the driving tasks in the same driving scenario and rated their emotional responses during the driving processes from the aspects of dimensional emotion and discrete emotion. We also conducted classification experiments to recognize the scales of arousal, valence, dominance, as well as the emotion category and intensity to establish baseline results for the proposed dataset. Besides, this paper compared and discussed the differences in facial expressions between driving and non-driving scenarios. The results show that there were significant differences in AUs (Action Units) presence of facial expressions between driving and non-driving scenarios, indicating that human emotional expressions in driving scenarios were different from other life scenarios. Therefore, publishing a human emotion dataset specifically for the driver is necessary for traffic safety improvement. The proposed dataset will be publicly available so that researchers worldwide can use it to develop and examine their driver emotion analysis methods. To the best of our knowledge, this is currently the only public driver facial expression dataset. Copyright © 2020, The Authors. All rights reserved.

关键词： Classification (of information)

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Modeling of laser power attenuation by powder particles for laser solid forming

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Procedia CIRP 2020年 95卷 42-47页

作者： Junhua Wang Zhen Zhang Fuzhu Han Shu-fan Chen Weisheng Ying Department of Mechanical Engineering Tsinghua University Beijing 100084 China School of Mechatronics Engineering Henan University of Science and Technology Luoyang 471023 China Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Tsinghua University Beijing 100084 China

Laser solid forming (LSF) is a typical laser additive manufacturing technology integrating rapid prototyping manufacturing and laser cladding. Laser power attenuation greatly influences the amount and distribution of laser energy. It is important to establish a theoretical model of laser power attenuation to effectively control the laser energy transmission and to ensure the stability of the molten pool. Considering the effects of overlap phenomenon among powder particles, a theoretical model of laser power attenuation is proposed by introducing the concept of the effective number of powder particles. The proposed model enables the accurate calculation of the laser power attenuation in arbitrary volume fraction of powder particles. The results indicate that the laser power attenuation is proportional to the powder feeding rate, and the increase rate of laser power attenuation is inverse proportional to the powder feeding rate. In addition, a simple method for measuring the laser power attenuation is also proposed to experimentally validate the proposed theoretical model. The experimental results validate the proposed method.

关键词： Laser power attenuation Laser solid forming Powder stream

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