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International Conference on Robotics and Artificial Intelligence (ICRAI)

作者： Ahmed Mobrez Muhammad El-Brollossy Muhammad Yehia Mohammed I. Awad Shady A. Maged Dilruba Siddiqi Hafiz F. Maqbool Mechatronics Engineering Ain Shams University Cairo Egypt Department of Mechatronics and Control Engineering The University of Engineering & Technology Faisalabad Pakistan

Walking is considered one of the most common lower limb activities of able-bodied humans during their everyday life activities. The loss in mobility due to amputation results in a degradation of the quality of life for amputees. This could affect many aspects of the amputees' personal and professional lives. Over the last few decades, there has been a rapid development in the prosthetics and rehabilitation industry due to state-of-the-art developments in technologies such as material, mechanical, electronics, sensors, mechatronics and actuation systems. However, they require complex and costly manufacturing processes which cannot be afforded and implemented in low-income countries. This paper introduces a design guideline of a low-cost microprocessor prosthetic knee which can be built and implemented in developing countries. This covers the mechanical design, hydraulic circuit design and simplified control algorithm.

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Fuzzy Logic Based Calculation and Analysis of Health Index for Power Transformer Installed in Grid Stations 3

Fuzzy Logic Based Calculation and Analysis of Health Index f...

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3rd IEEE International Symposium on Recent Advances in Electrical engineering, RAEE 2019

作者： Idrees, Muhammad Riaz, Muhammad Tanveer Waleed, Aashir Paracha, Zahir Javed Raza, Hafiz Ahmad Khan, Muhammad Abbas Hashmi, Wajahat Saleem School of Electrical Engineering University of Faisalabad Faisalabad38000 Pakistan Department of Mechatronics and Control Engineering UET Lahore Faisalabad Campus Pakistan Department of Electrical Engineering University of Engineering and Technology Lahore Punjab Pakistan Changchun University of Science and Technology Jilin Sheng130012 China

ISBN: (纸本)9781728130729

The health index calculation is a very useful tool for power transformer maintenance prediction. Generally, transformer health condition is directly assessed by diagnostic tests carried out for the transformer insulation. Then these test results are used to evaluate health and to estimate the remaining life of the transformer. By using different parameters of the transformer, the Health Index shows the degradation of insulation in the transformer. These parameters of the transformer typically act at the identical time, due to this reason evaluation of health index of the transformer is very difficult. In this paper different parameters are utilized to create sub-models of fuzzy (i.e. DGA, Dielectric strength of oil, loading data, insulation resistance, CDF) for assessment of transformer critical conditions. The integrated fuzzy model developed by combining the sub-models of fuzzy logic. This model of fuzzy logic provides the identification of transformer insulation condition level of its criticality. The integrated fuzzy model approach decreases the complexity in life estimation and health index evaluation of power transformer. With the help of the health index, it can be determined the transformer health condition and can be taken the necessary remedial action to save the costly equipment at grid stations to overcome the occurrence of severe equipment damaging faults. © 2019 IEEE.

关键词： Membership functions

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Analysis of actuation characteristics of CuAlNiMn/Polyimide thin film shape memory alloy

Analysis of actuation characteristics of CuAlNiMn/Polyimide ...

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2019 International Mechanical engineering Congress, IMEC 2019

作者： Geetha, M. Dhanalakshmi, K. Jayachandran, S. Palani, I.A. Sathish Kumar, V. Department of Instrumentation and Control Engineering National Institute of Technology Tiruchirappalli620021 India Mechatronics and Instrumentation Lab Discipline of Mechanical Engineering Indian Institute of Technology Indore453331 India Mechanical Engineering Kongunadu College of Engineering and Technology Tiruchirappalli621215 India

The article presents the study of the deformation of an SMA bimorph actuator during static heating. The thermomechanical behavior of thin film CuAlNiMn shape memory alloy (SMA) on polyimide substrate is analyzed using finite element method. The analysis is carried out for three different geometries to obtain the displacement when temperature is varied. The actuation characteristics of the SMA bimorph are studied through direct heating and joule heating techniques. The surface morphology and composition of the bimorph sample are obtained using the Scanning Electron Microscope (SEM). The numerical analysis of the thermomechanical behavior of a thin film CuAlNiMn SMA bimorph is carried out using the finite element method. The procedure is applied for a double-legged cantilever configuration of the bimorph to obtain the actuation in terms of displacement;by varying the temperature. The same is repeated for semi-circular and pentagon shapes of the bimorph to obtain the influence of area on the displacement. It is observed that SMA bimorph displaces with the rise in temperature and the magnitude of displacement increases with the increase in surface area of different geometries. The physical actuation characteristic of CuAlNiMn-polyamide bimorph is studied by thermal heating and electrical heating of the sample, which confirm the shape memory effect of the SMA and provide the displacement characteristics of the bimorph when applying an electrical current. © 2019 Elsevier Ltd.

关键词： Aluminum alloys

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A highly efficient hot embossing technique for precision glass micro-optics through localized rapid heating of carbide-bonded graphene coating 19

A highly efficient hot embossing technique for precision gla...

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19th International Conference of the European Society for Precision engineering and Nanotechnology, EUSPEN 2019

作者： Li, Lihua Zhou, Jian Ng, Man Cheung Lee, Wing Bun Wang, Xingzheng State Key Laboratory of Ultraprecision Machining Technology Department of Industrial and Systems Engineering Hong Kong Polytechnic University Kowloon Hong Kong School of Mechatronics and Control Engineering Shenzhen University Shenzhen518060 China

ISBN: (纸本)9780995775145

The efficiency of the conventional hot embossing or molding technique is restricted by the long bulk thermal process. In this paper, a highly efficient hot embossing technique was developed through the localized rapid heating approach, where a thin coating layer functioned as the resistant heating source to heat only the surface of glass sample. Herein carbide-boned graphene (CBG) coated on silicon wafer, served as the heating coating, by taking advantage of its high thermal and electrical conductance, superior mechanical properties and excellent anti-sticking performance. The previously reported CBG-based hot embossing applications are limited to low temperature below 250 ℃, due to oxidation and adhesion defects. To extend the application of this technique onto glass micro-embossing where the operating temperature is much higher, the CBG-coated silicon mold did not contact the glass sample when the coating was electrically charged in our modified process. Based on the modification on process diagram and delicate design of embossing equipment, successful fabrication of a closely packed microlens array was realized by using the CBG-based hot embossing on N-BK7 glass where the embossing temperature was chosen as high as 800 ℃ in this study. The measured form error of embossed microlens array were small enough to meet the demands of precision optics, therefore the authenticity of precise and uniform replication was demonstrated. It was finally concluded that compared to the conventional method, a comparable optical performance was successfully achieved by using the newly developed technique, meanwhile the process duration and energy consumption were enormously reduced. © 2019 European Society for Precision engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Graphene

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A Grid-Interfaced Single Phase AC-DC Dual Active Bridge Converter with Enhanced Power Decoupling Technique

A Grid-Interfaced Single Phase AC-DC Dual Active Bridge Conv...

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2019 IEEE PES Asia-Pacific Power and Energy engineering Conference, APPEEC 2019

作者： Hong, Jiatu Lu, Jian Yin, Jian Jiang, Hui Peng, Jianchun Shenzhen University College of Mechatronics and Control Engineering Shenzhen China State Key Laboratory of Internet of Things for Smart City Department of Electrical and Computer Engineering University of Macau China Shenzhen University College of Optoelectronic Engineering Shenzhen China

ISBN: (纸本)9781728108131

The single phase AC-DC dual active bridge (DAB) converter is able to realize bidirectional power flow flexibly. Normally a large electrolytic capacitor needs to be placed at the DC side to stabilize the DC output voltage and current, which can compromise the power density of the converter. This paper presents an alternative power decoupling technique to stabilize the DC outputs, and meanwhile enhance the power density of the grid-interfaced AC-DC DAB converter. Simulation and experimental results are presented to verify the feasibility and performance of the proposed power decoupling technique. © 2019 IEEE.

关键词： Electrolytic capacitors

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Optimal Experiment Design for Multi-variable Motion Systems: with Application to a Next-Generation Wafer Stage ⁎

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IFAC-PapersOnLine 2019年第15期52卷 615-620页

作者： Nic Dirkx Jeroen van de Wijdeven Tom Oomen ASML Research Mechatronics & Control Veldhoven The Netherlands Eindhoven University of Technology Department of Mechanical Engineering Control Systems Technology Eindhoven The Netherlands

Frequency Response Functions (FRFs) are essential for motion control design of complex mechatronic systems. The aim of this paper is to develop Optimal Experiment Design (OED) approaches for accurate identification of FRF models, with the particular focus on Multiple Input Multiple Output (MIMO) systems in closed-loop. The resulting optimization problem is shown to be highly challenging, especially for complex systems. A practical and feasible numerical approach based on a convex relaxation is developed. Experimental results on a next-generation wafer stage confirm that the quality of FRF measurements can be improved significantly using the proposed techniques.

关键词： Optimal experiment design system identification multivariable systems frequency response function multisines

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The impact of TiO 2 nanostructures on the physical properties and electrical performance of organic solar cells based on PTB7:PC 71 BM bulk heterojunctions

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Materials Today: Proceedings 2021年 42卷 1921-1927页

作者： Naser Al-Shekaili Suhairul Hashim Fahmi F. Muhammadsharif M.Z. Al-Abri Khaulah Sulaiman Mohd Y. Yahya Mohd Ridzuan Ahmed Department of Physics Faculty of Science Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia Department of Physics Faculty of Science and Health Koya University Koya 44023 Kurdistan Region - F.R. Iraq Nanotechnology Research Centre Sultan Qaboos University PO Box 17 PC 123 SQU Al Khoudh Oman Department of Petroleum & Chemical Engineering College of Engineering Sultan Qaboos University PO Box 33 PC 123 SQU Al Khoudh Oman Low Dimensional Materials Research Centre Department of Physics Faculty of Science University of Malaya 50603 Kuala Lumpur Malaysia Centre for Advanced Composite Materials (CACM) Institute for Vehicle Systems & Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia Department of Control and Mechatronics Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia

Hybrid organic solar cells based on pairs of donor and acceptor materials offer enhanced light absorption width and surface morphology. In order to investigate the role of introducing metal oxide nanoparticles (NPs) and thermal annealing on the optical, structural and morphological behaviours of the active layer polymers’ [poly([4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl]{3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl}):[6,6]-Phenyl-C71-butyric acid methyl ester (PTB7:PC 71 BM), thin films with and without the addition of 10% TiO 2 nanoparticles (NP) were prepared and characterized. Ultraviolet–Visible- Near-infrared (UV–Vis-NIR) Spectrophotometry, Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD) techniques were used to characterize the thin films. Results show that incorporation of the TiO 2 (NPs) with annealing treatment of the thin films enhanced the optical absorption and crystallinity of the PTB7:PC 71 BM blend. The device based on PTB7:PC 71 BM showed power conversion efficiency (PCE) of 5.6%. The incorporation of 10%-TiO 2 into the PTB7:PC 71 BM blend leads to a sharp drop in PCE (0.08%).

关键词： Hybrid solar cells Organic solar cells (OSCs) PTB7:PC 71 BM:TiO 2 Surface morphology J-V characteristic

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Lightweight and High-Performance Microwave Absorber Based on 2D WS2-RGO Heterostructures

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Nano-Micro Letters 2019年第3期11卷 21-35页

作者： Deqing Zhang Tingting Liu Junye Cheng Qi Cao Guangping Zheng Shuang Liang Hao Wang MaoSheng Cao School of Materials Science and Engineering Qiqihar UniversityQiqihar161006People’s Republic of China Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060People’s Republic of China Department of Chemistry School of ScienceThe University of TokyoTokyo113.8656Japan4Department of Mechanical EngineeringSchool of EngineeringThe University of TokyoTokyo113.8656Japan Department of Mechanical Engineering Hong Kong Polytechnic UniversityHung HomKowloonHong KongPeople’s Republic of China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing100081People’s Republic of China

Two-dimensional(2D)nanomaterials are categorized as a new class of microwave absorption(MA)materials owing to their high specific surface area and peculiar electronic *** this study,2D WS2-reduced graphene oxide(WS2-rGO)heterostructure nanosheets were synthesized via a facile hydrothermal process;moreover,their dielectric and MA properties were reported for the first ***,the maximum reflection loss(RL)of the sample-wax composites containing 40 wt% WS2-rGO was-41.5 dB at a thickness of 2.7 mm;furthermore,the bandwidth where RL<-10 dB can reach up to 13.62 GHz(4.38-18 GHz).Synergistic mechanisms derived from the interfacial dielectric coupling and multiple-interface scattering after hybridization of WS2 with rGO were discussed to explain the drastically enhanced microwave absorption *** results indicate these lightweight WS2-rGO nanosheets to be potential materials for practical electromagnetic wave-absorbing applications.

关键词： 2D WS2 nanosheets Reduced graphene oxide Heterostructure Microwave absorption

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Retraction notice to “Empowering the boiling condition of Argon flow inside a rectangular microchannel with suspending Silver nanoparticles by using of molecular dynamics simulation” [J. Mol. Liquids 295 (2019) 111721]

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Journal of Molecular Liquids 2025年 422卷

作者： Yeping Peng Majid Zarringhalam Mehdi Hajian Davood Toghraie Shahrzad Jafari Tadi Masoud Afrand Shenzhen Key Laboratory of Electromagnetic Control College of Mechatronics and Control Engineering Shenzhen University Shenzhen 518060 China Young Researchers and Elite Club South Tehran Branch Islamic Azad University Tehran Iran Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156-83111 Iran Department of Mechanical Engineering Khomeinishahr Branch Islamic Azad University Khomeinishahr Iran Department of Petroleum Engineering Khomeinishahr Branch Islamic Azad University Khomeinishahr Iran Laboratory of Magnetism and Magnetic Materials Advanced Institute of Materials Science Ton Duc Thang University Ho Chi Minh City Vietnam Faculty of Applied Sciences Ton Duc Thang University Ho Chi Minh City Vietnam

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An input to state stability approach for evaluation of nonlinear control loops with linear plant model 7th

An input to state stability approach for evaluation of nonli...

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7th Computer Science On-line Conference, CSOC 2018

作者： Benes, Peter Bukovsky, Ivo Department of Instrumentation and Control Engineering Czech Technical University in Prague Prague Czech Republic Department of Mechanics Biomechanics and Mechatronics Center of Advanced Aerospace Technology Czech Technical University in Prague Prague Czech Republic

ISBN: (纸本)9783319911915

This paper introduces a novel ISS stability evaluation for a LNU based HONU-MRAC control loop where an LNU serves as a plant and a HONU as a non-linear polynomial feedback controller. Till now, LNUs have proven their advantages as computationally efficient and effective approximators, further optimisers of linear and weakly non-linear dynamic systems. Due to the fundamental construction of an HONU-MRAC control loop featuring analogies with discrete-time non-linear dynamic models, two novel state space representations of the whole LNU based HONU-MRAC control loop are presented. Backboned by the presented state space forms, the ISS stability evaluation is derived and verified with theories of bounded-input-bounded-state (BIBS) and Lyapunov stability on a practical non-linear system example. © 2019, Springer International Publishing AG, part of Springer Nature.

关键词： Model reference adaptive control

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