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Unleashing the potential of morphotropic phase boundary based hybrid triboelectric–piezoelectric nanogenerator

Journal of Materiomics 2024年第4期10卷 792-802页

作者： Sugato Hajra Aneeta Manjari Padhan Basanta Kumar Panigrahi Phakkhananan Pakawanit Zvonko Jagličić Naratip Vittayakorn Yogendra Kumar Mishra Sanghoon Lee Hoe Joon Kim Department of Robotics and Mechatronics Engineering Daegu Gyeongbuk Institute of Science and TechnologyDaegu42988Republic of Korea Department of Electrical Engineering Siksha O Anusandhan UniversityBhubaneswar751030India Synchrotron Research and Applications Division Synchrotron Light Research InstituteNakhon Ratchasima30000Thailand Institute of Mathematics Physics and Mechanics&Faculty of Civil and Geodetic EngineeringUniversity of LjubljanaJadranska191000LjubljanaSlovenia Advanced Materials Research Unit Department of ChemistrySchool of ScienceKing Mongkut's Institute of Technology LadkrabangBangkok10520Thailand Mads Clausen Institute NanoSYDUniversity of Southern DenmarkAlsion 26400SønderborgDenmark Robotics and Mechatronics Research Center Daegu Gyeongbuk Institute of Science and Technology(DGIST)Daegu42988Republic of Korea

Morphotropic phase boundary(MPB)-based ceramics are excellent for energy harvesting due to their enhanced physical properties at phase boundaries,broad operating temperature range,and ability to customize properties for efficient conversion of mechanical energy into electrical *** this work,Bi_(1–x)Na_(x)Fe_(1–x)Nb_(x)O_(3)(x=0.20,0.30,0.32 and 0.40,BNFNO abbreviation)based ceramics were synthesized using a solid-state route and blended with Polydimethylsiloxane(PDMS)to achieve flexible *** material characterization and energy harvesting were performed by designing a hybrid piezoelectric(PENG)-triboelectric(TENG)*** voltage and current of PENG,TENG,and hybrid bearing same device area(2 cm×2 cm)were recorded as 11 V/0.3μA;60 V/0.7μA;110 V/2.2μ*** strategies for enhancing the output performance of the hybrid device were evaluated,such as increased surface area(creating micro-roughness and porous morphology)and increasing electrode size and multi-layer hybrid device *** self-powered acceleration monitoring was demonstrated using the hybrid ***,the low-frequency-based wave energy is converted into electrical energy,confirming the usage of hybrid PENG-TENG devices as a base for battery-free sensors and blue energy harvesting.

关键词： Lead-free Acceleration Wave energy Morphotropic

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Development of Small-Scale Pneumatic Pump Module for Hybrid Gripper with Jamming Module

Development of Small-Scale Pneumatic Pump Module for Hybrid ...

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International Conference on Control, Automation and Systems ( ICCAS)

作者： Myeongjin Kim Jingon Yoon Donghyun Kim Dongwon Yun Department of Robotics and Mechatronics Engineering DGIST Daegu Korea

Owing to an increase in diverse disaster incidents instigated by natural catastrophes and human error, extensive research on mobile robots, designed for disaster environment comprehension and human rescue operations, and has become more prevalent. Specifically, endeavors are being undertaken to equip mobile robots with grippers, enabling confined space navigation and life-saving activities within disastrous circumstances. Prominent among these are investigations into hybrid grippers and actuation systems, utilizing both hard and soft materials for obstacle removal. Nevertheless, for effective deployment of mobile robots within real disaster scenarios, the necessity for a compact hybrid gripper and drive system is indispensable. This paper elucidates the design and realization of a small-scale pneumatic pump module, developed to operate the jamming module of the previously compactly implemented hybrid gripper, also incorporating discussions on performance validation experiments. The verification experiments confirmed the capability of the proposed small-scale pneumatic pump to adequately operate the jamming module, thus reinforcing the hybrid gripper's grasping performance.

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Performance Evaluation of Machine Learning Classifiers for Sudden Cardiac Arrest Detection

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Journal of The Institution of Engineers (India): Series B 2022年 1-7页

作者： Banerjee, Prakash Bhattacherjee, Saptak Dasgupta, Kousik Sen, Shibaprasad Department of Electrical and Electronics Engineering University of Engineering and Management Kolkata India School of Mechatronics and Robotics Indian Institute of Engineering Science and Technology Shibpur Howrah India Department of Computer Science and Engineering Kalyani Government Engineering College Kalyani India Department of Computer Science and Engineering University of Engineering and Management Kolkata India

Sudden cardiac arrest (SCA) is a type of cardiovascular disease which attacks a person so promptly that it gives minimum time for hospitalization and may also lead to the patient death. In order to save the patient from death, rapid detection of SCA just after the onset of symptoms with a high accuracy is very critical. Although numerous approaches of SCA detection based on electrocardiogram have been carried out, there is still need of standard method for SCA detection with high precession and fast detection. Hence, the present work proposes the use of four machine learning classifiers for detection of SCA based on temporal features extracted from ECG. Performance analysis of the classifiers used in this study on 19 SCA and 20 normal, i.e., healthy subjects, yields classification accuracies of 97.4%, 94.8%, 97.4% and 97.4% for SVM, decision tree, Naïve Bayes and KNN, respectively. Experimental results thus obtained demonstrate the potential of the proposed method as a promising alternative for SCA detection. © 2022, The Institution of Engineers (India).

关键词： Electrocardiograms

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Data-Driven Iterative optimization of TDOF Controller with Rational Model

Data-Driven Iterative optimization of TDOF Controller with R...

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2023 IEEE International Conference on mechatronics (ICM)

作者： Taejune Kong Hanul Jung Sehoon Oh Department of Robotics and Mechatronics Engineering DGIST Daegu Korea

For precise control, it can be achieved through a feedforward controller with a feedback control scheme. The feedforward controller can be automatically tuned with the datadriven methods through experimental results. However, these data-driven methods are interrupted when the input disturbance is applied. This problem can be solved using Disturbance Observer (DOB) in the control loop. In addition, a data-driven method derives accurate control performance by simultaneously tuning the feedforward controller and DOB model. Furthermore, a tuning algorithm with a rational model is proposed for the corresponding modeling to a flexible system. The simulation results verify that the proposed method accurately tunes the controller for an unknown plant under an input disturbance.

关键词： mechatronics Simulation Resonant frequency Iterative algorithms Disturbance observers Feedback control Feedforward systems

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Quantifying Joint Movement Variability in Healthy and Hemiplegic Gait using OpenSim 2

Quantifying Joint Movement Variability in Healthy and Hemipl...

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2nd IEEE International Conference on Interdisciplinary Approaches in Technology and Management for Social Innovation, IATMSI 2024

作者： Rafiq, Tabassum Younis, Sadia Narayan, Jyotindra Institute of Information Management and Technology Department of Biotechnology Uttar Pradesh Aligarh202001 India Government College of Engineering and Technology Department of Biomedical Engineering Jammu and Kashmir Ganderbal193504 India Indian Institute of Technology Guwahati Mechatronics and Robotics Laboratory Department of Mechanical Engineering Assam Guwahati781039 India

ISBN: (纸本)9798350360523

This study delves into the scaling capabilities of OpenSim, a biomechanical modeling tool, to scrutinize musculoskeletal alterations accompanying the hemiplegic condition compared to a healthy model. Contralateral hemiplegia (CH), characterized by unilateral paralysis, induces profound changes in bone size and significantly influences an individual's gait. Motivated by understanding the biomechanical repercussions of CH on human movement, we conducted a comprehensive investigation involving ten patients with CH, with a median age of 46 years (range: 39 to 52.0 years and height: 1.75 0.6 m). Ten healthy controls with similar body attributes were±also recruited. We assessed musculoskeletal changes post-CH using bone length data from MRI reports obtained from a hospital. Inverse kinematics in OpenSim are facilitated for a detailed comparison of joint angles between unhealthy and healthy individuals. The gait data is visualized and analyzed using statistical metrics such as mean absolute deviation, box plots, and a two-sample t-test. The results revealed significant differences in hip and ankle joint angles between healthy and hemiplegic individuals, underscored by low p-values. Interestingly, no significant difference was observed in knee joint angles (p-value = 0.9126). These findings contribute to a valuable understanding of hemiplegia-related musculoskeletal changes, offering potential avenues for tailored interventions to improve mobility and quality of life. © 2024 IEEE.

关键词： Inverse kinematics

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Semantic Segmentation in Unmanned Aerial Vehicle Surveillance for Detailed Urban Tree Mapping and Species Classification 6

Semantic Segmentation in Unmanned Aerial Vehicle Surveillanc...

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6th International Conference on Advancements in Computing, ICAC 2024

作者： Senanayake, S.M.R.B. Herath, H.M.K.K.M.B. Yasakethu, S.L.P. Madhusanka, B.G.D.A. Sri Lanka Technology Campus Department of Mechatronics Engineering Padukka Sri Lanka Sri Lanka Technology Campus Computational Intelligence and Robotics Research Lab Padukka Sri Lanka The Open University of Sri Lanka Department of Mechanical Engineering Nugegoda Sri Lanka

ISBN: (纸本)9798331517878

Urban greening is becoming increasingly important, which has increased interest in tracking and analyzing urban vegetation and highlighted the necessity for an accurate and practical evaluation of greenery inside cities. Unmanned Aerial Vehicles (UAVs) have become an essential tool for mapping vegetation at a broad scale, frequently using orthographic views to manage the heavy workload. This research examines semantic segmentation and a particular issue with tree species identification brought on by perspective views from different heights. The methodology involved the semantic segmentation methods used without orthorectification on a single low-altitude ( © 2024 IEEE.

关键词： Vegetation mapping

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Parameterization of Circuit Breakers for HVDC Transmission Line Between Egypt and the Kingdom of Saudi Arabia Toward Restriking Voltage

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IEEE Access 2024年 12卷 18259-18269页

作者： Eliyan, Tamer Elsisi, Mahmoud Alghaythi, Mamdouh L. Alshammari, Meshari S. Wadie, Fady Benha University Faculty of Engineering at Shoubra Department of Electrical Engineering Cairo 11629 Egypt Higher Institute of Engineering at El-Shorouk City Alshorouk Academy Department of Electrical Power and Machines Engineering Cairo 11837 Egypt National Kaohsiung University of Science and Technology Department of Electrical Engineering Kaohsiung 807618 Taiwan Jouf University College of Engineering Department of Electrical Engineering Sakaka 72388 Saudi Arabia Egyptian Russian University Faculty of Engineering Mechatronics and Robotics Engineering Department Badr City 11829 Egypt

The high voltage direct current (HVDC) transmission lines represent the prospective way for long-distance transmission between countries, remote areas, and offshore wind farms to decrease power loss. However, the HVDC protection systems have many challenges against any system issue, such as maintenance and short circuits. Thus, the vital role played by high voltage direct current circuit breaker CB has made it the center of attention in HVDC protection systems. The main challenge in HVDC CB is the lack of naturally exiting current zero that allows the breaker to extinguish the arc during the opening process. Thus, a commutation L-C circuit is required to inject an oscillating current and enforce a zero-crossing. Nevertheless, the L-C branch is affected directly by the arcing time, the transient recovery voltage (TRV), and the rate of rise of recovery voltage (RRRV). This paper investigates the parametric uncertainties of L-C and SF6 mechanical interrupters, including cooling power and arc time constant upon TRV and RRRV, based on Mayr's black-box model. Furthermore, a part of 3000 MVA, 500 kV HVDC transmission line between Egypt and the Kingdom of Saudi Arabia is used as a testing system employing ATP/EMTP software package to demonstrate the effect of CB's parameters variations. The results indicate that the capacitance represents the major parameter having a direct impact on TRV and RRRV. In essence, the proper parameterization of the CB is highly required in the design process of HVDC CB to enhance the decision-making and ensure that the L-C is capable of reducing arcing time and TRV simultaneously. © 2013 IEEE.

关键词： arcing time black-box arc model circuit breakers HVDC protection systems RRRV Transmission lines TRV

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Evaluation of modal parameters and static characteristics for composite mono leaf spring

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Noise and Vibration Worldwide 2021年第3期52卷 33-47页

作者： Samir Mohamed Mohamed Soliman, Ehab Mechatronics and Robotics Department Faculty of Engineering Egyptian Russian University Badr CityCairo11829 Egypt

The objective of this paper was to investigate and evaluate modal parameters and static characteristics for designed carbon/epoxy composite CFRP leaf spring made from carbon ﬁber-reinforced epoxy by comparing its finite element analysis FEA modal, harmonic and static results to that of conventional steel one under the same maximum full bump load. In ANSYS software, finite element modal, harmonic and static analysis for 3D models of conventional steel and designed composite mono leaf springs is carried out. FEA displacements for the steel and designed composite CFRP mono leaf springs at the maximum full bump load were 92.9 mm and 93.1 mm respectively. Compared to the steel mono leaf spring, the composite mono leaf spring has advantages;lower stresses, higher natural frequencies and higher safety in stresses of front and rear eyes. All these advantages let the composite leaf spring can be carried maximum full bump load with enough higher performance over steel one to avoid resonance and satisfy maximum stress failure criterion. © The Author(s) 2020.

关键词： Carbon

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Development of a low-cost microfluidic chip for hyaluronidase-free oocyte denudation in mammals

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Biotechnology Notes 2025年 6卷 133-142页

作者： Dessouky, Ashraf Hisham El-Hussieny, Haitham El-Sherry, Taymour Mohammed Parque, Victor Fath El-Bab, Ahmed M.R. Department of Mechatronics and Robotics Engineering Egypt-Japan University of Science and Technology (E-JUST) Alexandria Alexandria 21934 Egypt Mechanical Engineering Department Helwan University Cairo Cairo 11792 Egypt Department of Theriogenology Veterinary Hospital Faculty of Veterinary Medicine Assiut University Assiut Assiut Egypt of Advanced Science and Engineering Hiroshima University Hiroshima HigashiHiroshima 739-8527 Japan

Infertility in mammals is one of the most intricate medical issues requiring non-traditional interventions. In Vitro Fertilization (IVF) is one of the modern medical technologies currently used to treat infertility. However, current IVF procedures are inaccessible and unaffordable to the majority due to the high cost, the complexity of the procedure, and the reliance on highly qualified operators. For successful IVF, oocyte denudation, the process of removing cumulus cells from oocytes, is often performed. Here, microfluidics offers the potential to enhance denudation procedures and to minimize operator variability. In this paper, we propose the configuration of a microfluidic chip for oocyte denudation whose structure hybridizes inner jagged surfaces and expansion units. The jagged surface units have the role of removing the cumulus cells surrounding the oocyte by using the wall shear stress principle, and the (rounded) expansion units have the role of rotating the cumulus cells for further deployment in subsequent jagged surfaces. The proposed device can be manufactured at a low cost (<1 USD)) by the engraving of CO₂ laser machine on PMMA material, and is able to circumvent the use of enzymatic components such as hyaluronidase. Experiments using computational simulations and manufactured microfluidic chips evaluated distinct geometry configurations of the jagged surfaces and identified the suitable flow rates for maximal shear stress and denudation performance. Manufactured samples of the proposed microfluidic devices have shown the denudation performance of 96.7 % and yield rate of 90 % at a constant flow rate of 1 ml/min. © 2025 The Authors

关键词： CO2 laser In vitro fertilization Microfluidics Oocyte denudation

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Control Characteristics of Zero-Current-Switching Quasi-Resonant Boost Converter under Variation of Resonant Circuit and Load Parameters 4

Control Characteristics of Zero-Current-Switching Quasi-Reso...

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4th IEEE KhPI Week on Advanced Technology, KhPI Week 2023

作者： Dymerets, Andrii V. Yershov, Roman D. Gorodny, Alexey N. Stepenko, Serhii A. Revko, Anatoliy S. Department of Electronics Automation Robotics and Mechatronics National University "Chernihiv Polytechnic" Chernihiv Ukraine Department of Electrical Engineering Information and Measurement Technologies National University "Chernihiv Polytechnic" Chernihiv Ukraine

ISBN: (纸本)9798350395532

The investigation of resonant circuit parameters influence on the control characteristics behavior in a boost half-wave zero-current switching quasi-resonant converter is presented. The dependences of the control pulses duration and operating frequency as well as electric characteristics under variation of resonant circuit time constant and control pulses duty cycle are established by the numeric simulation and are represented as 3D-surfaces. The dependences of these characteristics under variation of load impedance and control pulses duty cycle are also obtained. The obtained results can be used in the process of developing and constructing a table-based, robust multi-loop or nonlinearity compensated control systems for quasi-resonant converters. © 2023 IEEE.

关键词： Zero current switching

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