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International Symposium on mechatronics and its Applications

作者： Ali Alghamri Shayok Mukhopadhyay Ahmed Osman Mechatronics Engineering Graduate Program Department of Electrical Engineering American University of Sharjah PO Box 26666 Sharjah UAE

ISBN: (纸本)9781467377980

This paper presents a strategy for controlling the terminal voltage of a three phase switched rectifier. The novelty of the proposed method is that we use model reference adaptive control (MRAC) along with a custom designed switching mechanism. The switching mechanism is inspired by quantized control techniques. In this paper we do not focus on controlling the individual line currents but only on controlling the terminal voltage. The mathematical formulation of this problem is presented following the MRAC framework. Further we also validate the mathematical model by comparing its output with a Simulink based model which uses pre-existing blocks from the appropriate Simulink toolbox. Finally we also present simulation results of the proposed control scheme to show that using MRAC with the proposed quantization technique achieves desired *** work can be extended in future for extracting maximum power from wind generators in a microgrid system.

关键词： Quantized Adaptive Approach Three Phase Switched Rectifier Voltage Control MRAC

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Multi-band printed antennas impedance characterization using a FDTD/WP-PML based methodology

Multi-band printed antennas impedance characterization using...

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SBMO/IEEE MTT-S International Conference on Microwave and Optoelectronics (IMOC)

作者： Glaucio Lopes Ramos Cássio Gonçalves do Rego Graduate Program in Electrical Engineering Department of Telecommunication and Mechatronics Engineering Federal University of Minas Gerais Federal University of São João del-Rei Ouro Branco Minas Gerais Brazil Department of Electronics Engineering Federal University of Minas Gerais Belo Horizonte Minas Gerais Brazil

This paper presents the results of the application of a FDTD technique to determinate the return loss parameter of two printed multi-band antennas. The impedance characterization of wide-band printed antennas with lossy substrates is introduced by means of an approach based on FDTD method and the WP-PML absorbing boundary condition. It was used a simple voltage source model where an excitation plane with an Gaussian vertical electrical field was imposed to a rectangular area just below the structure to be analyzed. Preliminary results obtained for the return loss of MIMO multi-band antennas are compared to those determined from other FDTD-based methods available in the scientific literature in order to show the applicability of the methodology that has been developed herein. The results obtained for return loss parameter showed good agreements between the technique proposed by this work and the results previous done.

关键词： Antennas Time domain analysis Finite difference methods Antenna measurements Geometry Boundary conditions

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PDMS through-hole fabrication by soft lithography using CH4/He atmospheric RF plasma surface treatment

PDMS through-hole fabrication by soft lithography using CH4/...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Jongchan Choi Kyeong-Hwan Lee Ji A Choi Sun Hwa Lee Sung Yang School of Information and Mechatronics Gwangju Institute of Science and Technology Gwangju South Korea Department of Rural and Biosystems Engineering Chonnam National University Gwangju South Korea Institute of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea Department of Nanobio Materials and Electronics School of Information and Mechatronics Graduate Program of Medical System Engineering Gwangju Institute of Science and Technology Gwangju South Korea

This paper presents a PDMS micro through-hole molding method by simple soft lithography process in which the surface of a master mold and a substrate is treated by atmospheric CH 4 /He RF plasma to feature hydrophobic property on the surface. Rectangular and circular-shaped PDMS micro through-hole layers are made by the proposed fabrication method. As one of the applications of the PDMS micro through-hole layer for multi-layered systems, a radial concentration gradient generator including a micro through-hole layer is constructed and its performance is tested. The micro through-holes fabricated by the proposed method are well-defined. The concentration gradients measured in radial directions are in a similar level. Also, the tearing problem, which is often happened in spin-coating and lift-off molding methods, is not observed during the fabrication process of the PDMS micro through-holes. Therefore, we believe that the proposed fabrication method contributes to improve the technology for PDMS through-hole fabrication.

关键词： Surface treatment Fabrication Plasmas Substrates Helium Generators Radio frequency

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A plug-in procedure for hybridization of PI controllers ⁎

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IFAC-PapersOnLine 2019年第1期52卷 892-897页

作者： Mariella M. Quadros Ignacio Rubio Scola Valter J.S. Leite Sophie Tarbouriech Electrical Engineering Graduate Program CEFET-MG & UFSJ Belo Horizonte MG 30510-000 Brazil. National University of Rosario (UNR) CIFASIS — CONICET Rosario 2000 Argentine. Department of Mechatronics Engineering CEFET-MG Divinópolis MG 25503-822 Brazil. LAAS — CNRS Université de Toulouse CNRS France.

The nonlinear action of hybrid PI controllers makes possible to achieve almost none overshot with the smallest rise time possible (for the available input energy) and a settling time almost equal to the rise time. However, all of these nice properties require changes on the control loop. Our contribution is the proposition of a plug-in control action that can be added to the classical linear PI to avoid changes in the hardware, and still achieve the same behavior of a recently introduced adaptive hybrid PI controller. Our proposal is illustrated by real-time level control experiments in a nonlinear reservoir. Performance indexes are presented to evaluate the experimental tests.

关键词： Hybrid PI controllers. Implementation. Robust control. Performance limits. Integral performance indexes

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Phase-change metal ink with pH-controlled chemical sintering for versatile and scalable fabrication of variable stiffness electronics

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Science Advances 2025年第22期11卷 eadv4921页

作者： Simok Lee Gun-Hee Lee Inho Kang Woojin Jeon Semin Kim Yejin Ahn Choong Yeon Kim Do A Kwon Michael D. Dickey Steve Park Seongjun Park Jae-Woong Jeong School of Electrical Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea. Medical Research Center Seoul National University Seoul 03080 Republic of Korea. Departments of Cogno-Mechatronics Engineering and Optics and Mechatronics Engineering Pusan National University Busan 46241 Republic of Korea. Graduate School of Semiconductor Technology Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea. KAIST Information and Electronics Research Institute Daejeon 34141 Republic of Korea. Research Laboratory of Electronics Massachusetts Institute of Technology (MIT) Cambridge MA 02139 USA. Department of Mechanical Engineering Massachusetts Institute of Technology (MIT) Cambridge MA 02139 USA. Department of Chemical and Biomolecular Engineering North Carolina State University (NCSU) Raleigh NC 27606 USA. Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology (KAIST) 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea. KAIST Institute for NanoCentury Daejeon 34141 Republic of Korea. Department of Biomedical Sciences College of Medicine Seoul National University Seoul 03080 Republic of Korea. School of Transdisciplinary Innovations Seoul National University Seoul 03080 Republic of Korea. Interdisciplinary Program in Bioengineering College of Engineering Seoul National University Seoul 08826 Republic of Korea. Department of Transdisciplinary Medicine Seoul National University Hospital Seoul 03080 Republic of Korea. KAIST Institute for Health Science and Technology Daejeon 34141 Republic of Korea.

Variable stiffness electronics represent the forefront of adaptive technology, integrating rigid and soft electronics in a single system through dynamic mechanical modulation. While gallium’s high modulus tuning ratio and rapid phase transitions make it ideal for transformative electronic systems (TES), its liquid-state instability, high surface tension, and unintended phase transitions during processing pose substantial challenges. Here, we introduce STiffness-Adjustable temperature-Responsive ink (STAR ink), a chemically sinterable gallium composite electronic ink designed to overcome these obstacles. STAR ink enables high-resolution (~50 micrometers) circuit patterning, large-scale batch fabrication, and three-dimensional structure coating at room temperature. Through pH-controlled chemical sintering, STAR ink–based TES exhibits exceptional mechanical tunability (tuning ratio: 1465) and electrical conductivity (2.27 × 106 siemens per meter). Demonstrated applications—from multilayered variable stiffness printed circuit boards (PCBs) matching standard PCBs’ complexity to body-temperature responsive neural probe—underscore STAR ink’s potential for reconfigurable electronics across consumer electronics and biomedical devices.

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Self-supervised approach for facial movement based optical flow

arXiv

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arXiv 2021年

作者： Alkaddour, Muhannad Tariq, Usman Dhall, Abhinav Graduate Program in Mechatronics Engineering American University of Sharjah Sharjah United Arab Emirates Department of Electrical Engineering American University of Sharjah Sharjah United Arab Emirates Department of Human Centred Computing Monash University Melbourne Australia Department of Computer Science and Engineering Indian Institute of Technology Ropar Rupnagar India

Computing optical flow is a fundamental problem in computer vision. However, deep learning-based optical flow techniques do not perform well for non-rigid movements such as those found in faces, primarily due to lack of the training data representing the fine facial motion. We hypothesize that learning optical flow on face motion data will improve the quality of predicted flow on faces. The aim of this work is threefold: (1) exploring self-supervised techniques to generate optical flow ground truth for face images;(2) computing baseline results on the effects of using face data to train Convolutional Neural Networks (CNN) for predicting optical flow;and (3) using the learned optical flow in micro-expression recognition to demonstrate its effectiveness. We generate optical flow ground truth using facial key-points in the BP4D-Spontaneous dataset. The generated optical flow is used to train the FlowNetS architecture to test its performance on the generated dataset. The performance of FlowNetS trained on face images surpassed that of other optical flow CNN architectures, demonstrating its usefulness. Our optical flow features are further compared with other methods using the STSTNet micro-expression classifier, and the results indicate that the optical flow obtained using this work has promising applications in facial expression analysis. © 2021, CC BY.

关键词： Optical flows

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Neural nets modelling for automotive welding process

Neural nets modelling for automotive welding process

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16th IASTED International Conference on Modelling and Simulation

作者： Mendoza, Ricardo A. Ramírez Morales-Menéndez, Rubén Cantú-Ortiz, Francisco J. Mechatronics Engineering Program ITESM Monterrey Campus Av. E. Garza Sada # 2501 64849 Monterrey NL Mexico Center for Innovation in Design and Technology ITESM Monterrey Campus Av. E. Garza Sada# 2501 64849 Monterrey NL Mexico Graduate Studies Office ITESM Monterrey Campus Av. E. Garza Sada # 2501 64849 Monterrey NL Mexico

In this paper the authors study the applicability of Artificial Neural Networks for the modelling of a widely used particular welding process in automotive industry: pulsed gas metal welding process (GMAW-P). Applying this artificial intelligence technology requires the introduction of input and output data to the network. To achieve this, an experiment was designed and performed. The main functions of the proposed model are: to simulate the process for purposes of training operators;to improve welding process performance by identifying regions that are insensible to variations on input parameters;and finally to increase the flexibility of a robotic welding cell. The concrete benefits obtained from the GMAW-P process model development are: optimization of critical variables of the welding process, support for development of virtual process and prototypes, definition of a robust welding procedure, quick response to product change and support in welding training.

关键词： Welding

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Multiple sensor fusion for mobile robot localization and navigation using the Extended Kalman Filter

Multiple sensor fusion for mobile robot localization and nav...

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International Symposium on mechatronics and its Applications

作者： Ehab I. Al Khatib Mohammad A. Jaradat Mamoun Abdel-Hafez Milad Roigari Mechatronics Engineering Graduate Program American University of Sharjah Sharjah UAE Department of Mechanical Engineering American University of Sharjah Sharjah UAE

ISBN: (纸本)9781467377980

Navigation is an important topic in mobile robots. In this paper, an Extended Kalman Filter (EKF) is used to localize a mobile robot equipped with an encoder, compass, IMU and GPS utilizing three different approaches. Subsequently, an input output state feedback linearization (I-O SFL) method is used to control the robot along the desired robot trajectory. The presented algorithms are verified when the robot was steered along two different track shapes. Additionally, the performance of the method is demonstrated when a faultwas simulated on the sensors.

关键词： Localization Extended Kalman Filter (EKF) Navigation Input Output State Feedback linearization (IO-SFL) Mobile Robot

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Structural Analysis of Thumb Mechanism Exoskeleton Design for Post-Stroke Rehabilitation

Structural Analysis of Thumb Mechanism Exoskeleton Design fo...

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International Conference on Advanced mechatronics, Intelligent Manufacture, and Industrial Automation (ICAMIMIA)

作者： Rika Dwi Hidayatul Qoryah Harus Laksana Guntur Hendro Nurhadi Handri Prastyo Franciscus Xaverius Kristianta Shendy Chandika Graduate Program of Mechanical Engineering Department Institut Teknologi Sepuluh Nopember Surabaya Indonesia Mechanical Engineering Department Institut Teknologi Sepuluh Nopember Surabaya Indonesia Mechanical Engineering Department Center of Excellence for Mechatronics and Industrial Automation Research Center (PUI-PT MIA-RC) Institut Teknologi Sepuluh Nopember Surabaya Indonesia Undergraduate Program Mechanical Engineering Department University of Jember Jember Indonesia Mechanical Engineering Department University of Jember Jember Indonesia

Stroke is the second cause of death and the third cause of disability in the world. Stroke is a disease caused by a clot in the artery that supplies blood to the brain (ischemia). Rehabilitation is a solution to restore the function of parts of the body that have been disturbed by a stroke. Therefore, exoskeleton robots for stroke therapy are one solution to provide good rehabilitation. The exoskeleton robot supports healthy human hand movements and considers the safety and comfort factors during rehabilitation. The exoskeleton in this research uses a cable and sheath transmission mechanism with a locally situated motor as a design mechanism that guarantees safety and comfort. The design strength can be determined using ANSYS static structural assistance software so that the maximum stress in links 1, 2, and 3 is known within safe limits with anthropometric loading. Apart from that, the static structural simulation results show that link 1 can withstand a maximum load of 20 N or more in the X-axis loading, a load of 15 N in the Y-axis loading, and a load of 15 N in the Y-axis loading, and a load of 10 N in the Z-axis loading. Link 2 can withstand a maximum load of 10 N in the X-axis load and 20 N or more in the Y-axis load. Meanwhile, link 3 can withstand a maximum load of 20 N in the X-axis load and below 10 N in the Y-axis load.

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An Improved Impedance Estimation Method Based on Power Variations in Grid-Connected Inverters

An Improved Impedance Estimation Method Based on Power Varia...

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Brazilian Power Electronics Conference, COBEP

作者： José H. Suárez Hugo M. C. Gomes Luan S. Santana Alfeu J. Sguarezi Filho Leandro L. O. Carralero Fabiano F. Costa Department of Electrical Engineering Federal University of Bahia Salvador Brazil Pos-graduate program in Mechatronics Federal University of Bahia Salvador Brazil Centre Eng. Model. Appl. Social Scien. Federal University of ABC Santo André Brazil

ISBN: (数字)9781728141800

ISBN: (纸本)9781728141817

This paper proposes an improved version of a grid-impedance estimation method based on imposed variations of active and reactive power injected by inverters into the grid. The variations cause changes in the synchronous voltage v d and current i q at the point of common coupling (PCC) between the inverter and the grid. These variations are used to calculate the grid impedance. The proposed improvement relies on a positive sequence estimator enhanced by a Fourier filter which provides harmonic rejection capability to the method. A complete evaluation of the proposed method is performed through simulations in Matlab/Simulink environment. The results show that the method notably refines the impedance computation in moderate weak grids.

关键词： Estimation Impedance Inverters Resistance Inductance Distributed power generation Reactive power

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