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International Journal of Mechatronics and Applied Mechanics 2024年第15期2024卷 15-22页

作者： Lami, Sarah K. Al-Bakri, Fawaz F. Ali, Hasan H. Khafaji, Salwan Obaid Waheed Technical Institute of Babylon Iraq University of Babylon College of Engineering Department of Biomedical Engineering Babylon Iraq Ministry of Higher Education and Scientific Research Baghdad Iraq University of Babylon College of Engineering Mechanical Engineering Department Babylon Iraq

An electromagnetic actuator (EMA) represents a heartening approach to take the place of an imitative mechanical actuator system in plenty of workable applications. However, it is unlikely to be functional without achieving a successful execution by designing an active positioning-controller which can stabilize the system rapidly. In this work, a new analytical algorithm for the electromagnetic actuator (EMA) system has been developed. The proposed algorithm aims to generate well-suited reference position, velocity, coil current, and coil voltage profiles that rely on the initial and final states. Firstly, the reference position and velocity are shaped by a series of exponential functions with time as the independent variable. Then, initial and steady-state position, velocity, and acceleration conditions are automatically satisfied to ensure the required reference coil current and voltage. Eventually, extensive initial actuator position dispersions are considered to perform the presented approach using the Monte-Carlo simulation method. The demonstrated results show that the suggested algorithm strategy can greatly stabilize the electromagnetic actuator with a fast response and less overshoot in the presence of wide initial position dispersions. © 2024, Cefin Publishing House. All rights reserved.

关键词： mechanical actuators

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Phononic origin of structural lubrication

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Friction 2023年第6期11卷 966-976页

作者： Yun DONG Yongkang WANG Zaoqi DUAN Shuyu HUANG Yi TAO Xi LU Yan ZHANG Yajing KAN Zhiyong WEI Deyu LI Yunfei CHEN Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments School of Mechanical EngineeringSoutheast UniversityNanjing211189China Department of Mechanical Engineering Vanderbilt UniversityNashville37235-1592USA

Atomistic mechanisms of frictional energy dissipation have attracted significant ***,the dynamics of phonon excitation and dissipation remain elusive for many friction *** systematic fast Fourier transform(FFT)analyses of the frictional signals as a silicon tip sliding over a graphite surface at different angles and velocities,we experimentally demonstrate that friction mainly excites non-equilibrium phonons at the washboard frequency and its *** molecular dynamics(MD)simulations,we further disclose the phononic origin of structural lubrication,i.e.,the drastic reduction of friction force as the contact angle between two commensurate surfaces *** commensurate contacting states,friction excites a large amount of phonons at the washboard frequency and many orders of its harmonics that perfectly match each other in the sliding tip and substrate,while for incommensurate cases,only limited phonons are generated at mismatched washboard frequencies and few low order harmonics in the tip and substrate.

关键词： phononic friction washboard frequency structural lubrication commensurate and incommensurate interfaces

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An experimental and numerical approach for optimization of internal and external corrugations with various geometries in cylindrical thin-walled concertina energy absorbers under quasi-static axial load

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Mechanics of Advanced Materials and Structures 2024年第25期31卷 6628-6642页

作者： Rahpeima, Reza Nateghi Boroujeni, Iman Nia, Ali Alavi Graduate institute of biomedical electronics and bioinformatics College of Electrical Engineering and Computer Science National Taiwan University Taipei Taiwan Department of Mechanical Engineering Tarbiat Modares University Tehran Iran Department of Mechanical Engineering Bu-Ali Sina University Hamedan Iran

Thin-walled tubes have been extensively used as energy absorbers in many engineering structures that are under dynamic or quasi-static loads. In this article, the effect of corrugation and its geometry on the collapse characteristics of aluminum concertina tubes under quasi-static axial load is investigated both experimentally and numerically. The numerical simulations were performed with the use of LS-Dyna commercial software. Then, several chosen samples were tested experimentally to verify the results of the simulation. Forty different samples with four different corrugation geometries including singly isosceles triangular corrugation, continual isosceles triangular corrugation, continual scalene triangular corrugation, and continual semi-circular corrugation, and each with 10 different size dimensions were simulated. Among all of these simulations, six of them, each with two replicates were subjected to experimental tests. Experimental examples are aluminum cylindrical thin-walled tubes with the same thickness, height, and diameter that corrugations with different geometries are applied to them by the use of the cold rolling method. Finally, to describe the findings in more theoretical terms, a comparison between our obtained results and earlier theoretical investigations is made. The results show a significant influence of corrugations application on the improvement of the collapse characteristics of the cylindrical tubes so that the collapse style of intact tubes can be controlled by applying corrugations. The results show that by increasing the amplitude and number of corrugations, the absorbed energy, and the initial maximum force decrease. It is also found that among the different corrugation geometries, the corrugations with singly isosceles triangular geometry have the highest energy absorption as well as the lowest initial maximum force. © 2023 Taylor & Francis Group, LLC.

关键词： Geometry

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Utilization of Artificial Intelligence by Students in Interdisciplinary Field of biomedical engineering 15

Utilization of Artificial Intelligence by Students in Interd...

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15th International Multi-Conference on Complexity, Informatics and Cybernetics, IMCIC 2024

作者： Hashimoto, Shigehiro Biomedical Engineering Department of Mechanical Engineering Kogakuin University Tokyo163-8677 Japan

ISBN: (纸本)9781950492787

Students were encouraged to actively use artificial intelligence (AI) in learning and research in the field of biomedical engineering. In this study, student reports in class and the results of student research projects were analyzed. An issue with AI that was often discussed among students was the handling of copyright. In students' graduation research, AI was often used to search for technical terms and references. AI was used to list related technologies and check the feasibility of their ideas. AI was effective for self-learning. Particularly in interdisciplinary fields that require extensive basic knowledge, AI has demonstrated its power in self-learning specialized terminology. It was found that AI can be helpful for students in developing research topics and writing papers. © IMCIC 2024. All rights reserved.

关键词： Students

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Device for monitoring the vital functions of athletes using Arduino UNO development board 22

Device for monitoring the vital functions of athletes using ...

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2024 IEEE 22nd World Symposium on Applied Machine Intelligence and Informatics, SAMI 2024

作者： Spakova, Adriana Ferencik, Norbert Sedlakova, Veronika Kolembusova, Petra Steingartner, William Hudak, Radovan Technical University of Kosice Faculty of Mechanical Engineering Department of Biomedical Engineering Kosice Slovakia

ISBN: (纸本)9798350317206

This document outlines a proposal for the development of a device dedicated to monitoring the health and physical activity of athletes. The realization of this device leveraged the Arduino UNO microcontroller, and empirical trials have yielded encouraging results. The device was meticulously engineered with the primary objective of scrutinizing vital functions, encompassing heart rate, blood oxygen saturation, body temperature, lung capacity, and electromyography (EMG) for a comprehensive assessment of muscle activity. Furthermore, spirometry has been integrated to quantify lung vital capacity. This endeavor heralds pioneering prospects in the realm of health and fitness surveillance, proffering potential advantages not only to athletes but also to the broader populace. © 2024 IEEE.

关键词： Biological organs

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Role of IoT in characterization and material properties of synthesis of chromel composite

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Interactions 2024年第1期245卷 1-9页

作者： Siva, T. Bruno, A. Dyson Hepsiba, D. Vijay Anand, L.D. Ram, S. Priya, L. Department of Mechanical Engineering Meenakshi Ramaswamy Engineering College Tamilnadu Thathanur Ariyalur India Department of Mechanical Engineering PSNA College of Engineering and Technology Dindigul India Division of Biomedical Engineering Karunya Institute of Technology and Sciences Coimbatore India Division of Robotics Engineering Karunya Institute of Technology and Sciences Coimbatore India Department of Mechanical Engineering Gokaraju Rangaraju Institute of Engineering andTechnology Hyderabad India Department of Information Technology Bannari Amman Institute of Technology Erode Sathyamangalam638 401 India

The chromel metal matrix composite (MMC) was fabricated through stir casting process reinforced with Tantalum Carbides (TaC). It was used to further increase the substance properties. The morphology characteristics and chemical compositions have been studied through Scanning Electron Microscope (SEM) and Energy Dispersive Analysis of X- Ray (EDAX) respectively. The substance properties such as hardness, density, impact and tensile strength were measured. The quality of the casting components are achieved through monitoring of internet of things (IoT). IoT enabled stir casting system is used to fabricate the chromel composite. The casting process is fully automated by IoT. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Tensile strength

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Development and Prototyping of an Arduino UNO System for Studying Light Effects on Mesenchymal Stem Cell 17

Development and Prototyping of an Arduino UNO System for Stu...

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17th IEEE International Scientific Conference on Informatics, INFORMATICS 2024

作者： Sedlakova, Veronika Hudak, Radovan Ferencik, Norbert Kneppo, Peter Technical University of Kosice Faculty of Mechanical Engineering Department of Biomedical Engineering Košice Slovakia Czech Technical University in Prague Faculty of Biomedical Engineering Department of Biomedical Engineering Praha Czech Republic

ISBN: (纸本)9798350387674

This article presents the design and application of an Arduino UNO-based system incorporating nine red Light Emitting Diodes (LEDs) and a temperature and humidity sensor (DHT22) for research on mesenchymal stem cells (MSCs). The development of this prototype was motivated by existing researchs indicating the beneficial effects of red light on MSCs and the critical importance of maintaining consistent temperature conditions for preserving MSC viability and function. Future studies utilizing this system will investigate the impact of specific light wavelengths on MSC proliferation and differentiation, addressing gaps identified in previous studies and advancing our understanding of light-induced effects on MSC behavior. © 2024 IEEE.

关键词： Flowcharting

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Modeling Public Concerns for Unmanned Aerial System Operations in the National Airspace System

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Journal of Air Transportation 2024年第1期32卷 3-11页

作者： Philpott, Robert Winer, Eliot Iowa State University AmesIA50010 United States Department of Aerospace Engineering Human Computer Interaction Program United States Department of Mechanical Engineering Human Computer Interaction Program United States

The Unites States commercial unmanned aerial system (UAS) market was valued at $99.6 million in 2020 and is projected to reach $3.7 billion by 2030. Applications for these commercial UAS range from risk mitigation and surveillance to package delivery. Coupled with these emerging applications are the unique factors that arise with a commercial UAS’s compact size and low-altitude flights among the civilian populace. In this work, a value model was created to attempt to aid in determining the infringement of aUAS operation configuration on a civilian environment. Value functions were developed in an additive model that measures infringement (a UAS’s encroachment or trespass on a right or privilege of a civilian) based on these attributes. The resulting value model was tested by running 100,000 random simulations. Analysis of the simulation results and sensitivity analysis of the model showed that fleet size, proximity, duration of the operation within a certain proximity, and total operation duration were the attributes that drove a UAS operation’s infringement on an environment. A use case of an Amazon delivery application was then examined. This is a realistic scenario simulated to study if duration of an operation and time near a structure are kept to a minimum, the infringement of an operation remained low. This study provides initial determination of how infringement of UAS can be quantified and what infringement values may look like for different operational scenarios. © 2023 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Sensitivity analysis

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Thermoelastic rotating contact of an FGM coating with temperature-dependent and arbitrary varying properties

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Science China(Technological Sciences) 2023年第4期66卷 1038-1049页

作者： ZHOU JiaLin SHEN Fei LIU Jing EL-BORGI Sami KE LiaoLiang Department of Mechanics School of Mechanical EngineeringTianjin UniversityTianjin 300350China College of Engineering Huazhong Agricultural UniversityWuhan 430070Chin Mechanical Engineering Program Engineering BuildingTexas A&M University at QatarP.O.Box 23874Qatar

This paper investigates the frictional thermoelastic contact of a rigid spherical punch and functionally graded material(FGM)coated half-space with arbitrarily varying material *** material parameters include the elastic modulus,Poisson’s ratio,heat conduction parameter,and thermal expansion *** material parameters of the FGM coating and half-space are assumed to be temperature *** spherical punch is rotated in the FGM-coated half-space at a constant angular *** generated frictional heat is related to the friction coefficient,contact radius,angular velocity,and contact pressure.A theoretical formula for the thermoelastic rotating contact problem is established and solved using the finite element *** main objective of this paper is to investigate the effects of temperature dependence,gradient index,friction coefficient,angular velocity,and gradient form on the surface temperature and stresses.

关键词： rotating punch frictional heat functionally graded materials temperature dependence arbitrary properties

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Hybrid air conditioning and seawater desalination system assisted by solar energy: thermoeconomic investigation and optimization

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Journal of engineering and Applied Science 2024年第1期71卷 148页

作者： Yosry, Nashwa Elgendy, Essam Mostafa, Ahmed Fatouh, Mohamed Mechanical Power Engineering Department Faculty of Engineering at El-Mattaria Helwan University Cairo Egypt Mechanical Engineering Department College of Engineering & ampTechnology at Arab Academy for Science Technology & ampMaritime Transport Sheraton Cairo Egypt Energy and Renewable Energy Engineering Program Faculty of Engineering and Technology Egyptian Chinese University Ain Shams Egypt

The demand for freshwater has become progressively critical due to population growth and water scarcity. The current work investigates the energetic performance of a hybrid absorption refrigeration and desalination system. A parametric study for the system operating conditions has been performed to get the optimal conditions. Also, economic analysis and a multi-objective optimization method are used with the aim of maximizing the energy utilization factor of the system and minimizing total costs. The specific cost of desalinated water from the multi-objective optimization is calculated as (1.728 Cent/L) with the greatest energy utilization factor of (2.214). It turns out that, the system performs optimum at condensation and generation temperatures of 30 and 65 °C respectively, with resultant COP and GOR of 0.84 and 1.37. Using the optimum conditions, TRNSYS has been used to investigate the transient performance of the system for Marsa–Matrouh City in Egypt. The cooling and freshwater demands are 10 kW and 24 L/h. It was concluded that the input energy required to run the hybrid system decreased by about 65% less than that required for separate systems. With the assistance of solar energy, it became clear that the energy required was 60% less than the hybrid system as well. © The Author(s) 2024.

关键词： Hybrid systems

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