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Investigations on ZnO reinforced composite materials for electronic applications – A review

Materials Today: Proceedings 2023年 74卷 57-59页

作者： Greeesan, R. Jegan, J. Kannaki, S. Dineshkumar, S. Kayalvizhi, A. Department of Civil Engineering Chendhuran College of Engineering & Technology Pudukkottai India Department of Civil Engineering University College of Engineering Ramanathapuram India Department of Mechatronics Engineering Sri Krishna College of Engineering & Technology Coimbatore India Department of Mechanical Engineering Chendhuran College of Engineering & Technology Pudukkottai India

Nano particles or Nano Composites are one of the novel modules in materials science owing to their physical and chemical properties. In this review study, characterization, properties of reinforced Zinc Oxide is studied along with its applications in various fields like medical sector, engineering sectors, material science, composite elements and especially in electronic appliances. Variety of synthesization is applied along the researches based on ZnO NP's and we found that, using Sol gel method is most familiar one and the respective ZnO was reinforced with grapheme nano layers. Various morphological studies like were reviewed to find the exact constituents of composite, texture of the component and other related characterization. The Characteristic study of the composites was obtained that results indicate the appreciable performance of synthesized ZnO. Based on the literature investigation, the reinforced ZnO can be recommended to implement in various sectors like environmental, bio-medical, catalytic activities, electronic appliances etc. © 2022

关键词： Zinc oxide

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Experimental Analysis on FDM–3D Printing Process Parameters Optimization to Enhance Tensile Strength with PLA Material 1

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International Conference on Mechanical engineering: Researches and Evolutionary Challenges, ICMech-REC 2023

作者： Raffik, R. Akila, K. Sabitha, B. Sivaguru, J. Naveen, C. Sakira Parveen, A. Department of Mechatronics Engineering Kumaraguru College of Technology Tamil Nadu Coimbatore India Department of Mechatronics Engineering School of Engineering and IT Manipal Academy of Higher Education Dubai United Arab Emirates Department of Electronics and Communication Engineering SNS College of Technology Tamil Nadu Coimbatore India

ISBN: (数字)9789819722495

ISBN: (纸本)9789819722488

Three-dimensional (3D) printing technology has been successfully adopted in fascinating business including construction of buildings, manufacturing car parts, and medical related items. One of such additive manufacturing methods is fusion deposition modeling used to create the prototypes and intricate and complex shaped products. It is attracting many developed areas due to its ability to shorten product development cycles while avoiding the usage of costly instruments and tools. However, limited dimensional precision, poor surface quality, insufficient part strength, and insufficient mechanical qualities limit FDM's applicability. The features of FDM-created components and parts are influenced by process parameters such as layer thickness, raster width, build orientation, and print speed. The best and most optimal combinations of process parameters must be chosen. To evaluate the quality of the final product, a thorough review of pre-processing is required. The range of process parameters must be defined in line with the components of FDM machines. The various parameters differ depending on the machine type, nozzle diameter, and filament type. Setting the process settings correctly is thought to improve the quality of a three-dimensional (3D) printed component, potentially reducing post-manufacturing efforts. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Tensile strength

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Experimental Study on Heat Storage Properties Comparison of Paraffin/Metal Foams Phase Change Material Composites

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Journal of Thermal Science 2024年第2期33卷 469-478页

作者： Waqar AHMED Abid HUSSAIN Hanzla SHAHID Imran ALI Hafiz Muhammad ALI Department of Mechanical Engineering University of Engineering and TechnologyTaxila47080Pakistan Department of Mechanical Engineering Institute of Space TechnologyIslamabadPakistan Department of Mechanical Mechatronics and Manufacturing EngineeringUniversity of Engineering and Technology LahoreFaisalabad CampusPunjabPakistan Mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Renewable Energy and Power Systems(IRC-REPS) King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia

Heat storage properties of phase change materials(PCMs) are essential characteristics that perform a key role in thermal heat energy storage *** thermal properties of PCMs can be improved by developing metal foam/PCM *** addition of metal foam in PCMs has a significant effect on the thermal characteristics of *** this paper,the heat storage properties of two different metal foam/PCM composites were experimentally *** behavior of paraffin in metal foam(copper and iron-nickel)/paraffin composites concerning pure paraffin at a constant heat flux of 1000 W/m^(2) in three directions simultaneously(x,y,and z) was *** was infiltrated into copper and iron-nickel foams to develop composite materials which resulted in enhancing the thermal conductivity of the paraffin.A comparative analysis is made on the heat storage properties of paraffin in copper and iron-nickel foams/paraffin *** temperature distribution during the phase transition process is experimentally *** comparison indicates that temperature uniformity in copper foam/paraffin composite is better than in iron-nickel foam/paraffin composite and pure paraffin at the same heat *** results show that at heat flux of 1000 W/m^(2),the heat storage time for copper foam/paraffin composite is 20.63% of that of iron-nickel foam/paraffin composite.

关键词： heat storage capacity paraffin/metal foam composite temperature uniformity heat storage rate phase transition process

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Development and Implementation of Reliability Centered Maintenance Framework in Large Organisations 19th

Development and Implementation of Reliability Centered Maint...

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19th Global Conference on Sustainable Manufacturing, GCSM 2023

作者： Mhlungu, Mesuli Percival Daniyan, Ilesanmi Ramatsetse, Boitumelo Behrens, Thembeka Department of Industrial Engineering Tshwane University of Technology Pretoria0001 South Africa Department of Mechatronics Engineering Bells University of Technology P. M. B. 1015 Ota Nigeria Department of Mechanical and Mechatronics Engineering Stellenbosch University Stellenbosch South Africa

ISBN: (纸本)9783031774287

Large organisations across the world constantly seek to ensure the optimal operation of their processes to remain competitive against their industry peers. This study seeks to help the organisation improve maintenance performance by developing a framework that can be adopted by the organisation in implementing Reliability Centered Maintenance (RCM). This study develops a model to help companies to adopt RCM and to do that, a company were selected to test the model. A questionnaire was sent to a selected population to gather the views of people regarding maintenance within the selected organisation. This is achieved by first investigating the current maintenance regime in Company Y via a survey. Historical data relating to maintenance were obtained and analysed to highlight problem areas. Plant documents relating to maintenance policies were sought for the understanding of the status quo. The results obtained indicate that from 2016 to 2021, the organisation did not meet the maintenance target of 95% and there are major maintenance issues, which have affected the equipment availability and organisation’s productivity. Thus, a guideline for the implementation of RCM was developed for use. The guideline will be useful for organisations in their quest to achieve RCM for optimal productivity. © The Author(s) 2025.

关键词： Corrective maintenance

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Development of an Intelligent Dashboard for Surveillance in Online Learning Platform via Internet of Things technology 6

Development of an Intelligent Dashboard for Surveillance in ...

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6th International Conference on Power, Energy and Innovations, ICPEI 2024

作者： Kaewudorn, Thiti Chamniprasart, Kontorn Srisertpol, Jiraphon Poochaya, Settawit School of Mechatronics Engineering Suranaree University of Technology NakhonRatchasima Muang Thailand School of Telecommunication Engineering Suranaree University of Technology NakhonRatchasima Muang Thailand

ISBN: (纸本)9798350356779

COVID-19 pandemic situation made educational institutions worldwide shift towards online learning formats to minimize the spread of the virus. The content of online learning includes file, text, images, audio, and video, delivered directly to learners through web browsers. Both learners and instructors can communicate, collaborate, and exchange ideas similar to traditional classrooms. Online learning networks gain significant popularity in recent times, utilizing large-scale computer network technologies. Online learning offers convenience and rapid accessibility, allowing learners to study anytime and anywhere, according to their preferences. Also, large-scale computer networks require a high reliability network with zero downtimes. Thus, this work presents an environment monitoring and controlling system via internet of things technology for SUT E-Learning system which was developed by the Suranaree University of technology (SUT). Number of session, %CPU usage, Current, Temperature and humidity inside server room were investigated. The proposed system improves convenience for system control engineers to maintain an online learning system with low zero downtime. © 2024 IEEE.

关键词： Economic and social effects

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Spatiotemporal nonlinear dynamics in multimode fiber laser based on carbon nanotubes

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Frontiers of physics 2024年第5期19卷 179-184页

作者： Jingxuan Sun Yachen Wang Congyu Zhang Lijun Xu Bo Fu Key Laboratory of Precision Opto-Mechatronics Technology School of Instrumentation and Optoelectronic EngineeringBeihang UniversityBeijing 100191China Key Laboratory of Big Data-Based Precision Medicine Ministry of Industry and Information TechnologySchool of Engineering MedicineBeihang UniversityBeijing 100191China

We investigated 1-μm multimode fiber laser based on carbon nanotubes,where multiple typical pulse states were observed,including Q-switched,Q-switched mode-locked,and spatiotemporal mode-locked ***,stable spatiotemporal mode-locking was realized with a low threshold,where the pulse duration was 37 ps and the wavelength was centred at 1060.5 ***,both the high signal to noise and long-term operation stability proved the reliability of the mode-locked ***,the evolution of the spatiotemporal mode-locked pulses in the cavity was also simulated and *** work exhibits the flexible outputs of spatiotemporal phenomena in multimode lasers based on nanomaterials,providing more possibilities for the development of high-dimensional nonlinear dynamics.

关键词： spatiotemporal mode-locking multimode fiber saturable absorber ultrafast laser

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Nonlinear dynamic model of gear transmission system under the influence of vibration and noise

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Nanotechnology for Environmental engineering 2022年第3期7卷 759-763页

作者： Yang, Shufeng School of Mechatronics Engineering Zhongyuan University of Technology Zhengzhou45007 China

For gear pairs, there will be nonlinear factors such as time-varying meshing stiffness, tooth backlash and meshing error in gear meshing, which will affect the dynamic behavior of the system and make it appear complex nonlinear vibration. Long-term non-linear vibration will cause fatigue, wear and even cracks in the system, which will greatly reduce the reliability and stability of the system. Therefore, studying the nonlinear dynamic model of the gear transmission system has important theoretical and practical significance for the vibration control and noise reduction of the generator gearbox. On this basis, this paper studies the nonlinear dynamic model of the gear transmission system under the action of vibration and noise. In this paper, the dynamic characteristics of gears and the basic theory of gear modification are deeply studied. In this paper, a nonlinear dynamics model of the torsion coupled gear transmission is established. The influence of nonlinear factors such as time-varying meshing stiffness, transmission error and torsional deformation of the transmission shaft on the gear meshing vibration is analyzed, thereby greatly reducing the noise generated by the gear transmission system vibration. The results show that there are many noises in the gear transmission system. The frequency vibration factors in the system are analyzed, and the mechanism of vibration and noise or various nonlinear factors under different loads is analyzed, which has important theoretical significance for controlling the vibration and noise of gears. © 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Stiffness

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Kinematic analysis of a rotary dobby heald frame considering multiple clearance joints

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Journal of Textile engineering 2024年第6期70卷 110-119页

作者： Dong, Yunkun Sun, Huilai Yu, Hongbin Liu, Yang School of Mechanical Engineering Tiangong University Tianjin300387 China Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology Tiangong University Tianjin300387 China

Based on the working principle of a rotary dobby lifting mechanism, this paper investigates the typical four-link mechanism in a heald lifting setup. The Monte Carlo method is used to simulate the generation of clearance size, while the kinematic equations of the rotary dobby machine motion transfer mechanism, considering multiple clearance joints, are established. First, a method to measure the reliability index of the mechanism is proposed and the influence of clearance position and size, on the kinematic performance of the mechanism, is quantitatively analyzed. Following, the influence of different numbers of clearances on the chaos phenomenon of the mechanism is investigated, using the Poincare mapping diagrams, while the motion state of the mechanism, at different rotational speeds with the pin in the shaft sleeve, is analyzed. Finally, the influence of the size of the clearance, considering the case of three clearances, is focused on the investigation of the motion accuracy of the heald frame. The results of the study show that, the existence of multiple clearance joints leads to lower output motion accuracy of the rotary dobby heald frame;at the same time, the use of reliability measures proves that the motion stability of the mechanism deteriorates, as the clearance size increases;the increase in the number of clearances and in the rotational speed of the mechanism result in quasi-periodic and chaos phenomena, regarding the kinematic characteristics of the mechanism. Therefore, in order to ensure the motion accuracy of the mechanism, operating at high speed and with multiple clearances, the clearance size should be minimized. © 2024 The Textile Machinery Society of Japan.

关键词： Textile machinery

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Terminal Configuration Principles for Achieving Various Electromagnetic Integration Units with Flexible Multilayer Foil Technique

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IEEE Electromagnetic Compatibility Magazine 2023年第2期12卷 47-61页

作者： Jiang, Shiqi Wang, Panbao Wang, Wei Liu, Yitao Xu, Dianguo School of Electrical Engineering and Automation Harbin Institute of Technology Harbin150001 China Shenzhen University College of Mechatronics and Control Engineering Shenzhen518060 China

Owing to the greater integration capability, flexible multilayer foil (FMLF) technique has a great potential to promote the evolution of passive integration techniques. To understand the mechanism of this technique is essential for its applications and popularization. To this end, this paper reveals the fundamentals and terminal configuration principles to realize various functional electromagnetic integration units with FMLF technique. A regular FMLF winding is taken as the research object, from theoretical analyses on the associated distributed electromagnetic component (DEMC) circuits, the lumped electromagnetic component (LEMC) circuits with different terminal configuration modes are derived. Moreover, A FMLF winding prototype is built for experimental verifications. The LEMC circuits are demonstrated through the comparative analyses between practically measured and LTspice based simulated impedances or port characteristics. © 2021 IEEE.

关键词： Timing circuits

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Surface properties of friction stir welded dissimilar joints of AA7075 and Mg-WE43 alloys:Effect of positional arrangement

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Journal of Magnesium and Alloys 2025年第1期13卷 398-413页

作者： Tariq Ahmad Nadeem Fayaz Lone Noor Zaman Khan Babar Ahmad Arshad Noor Siddiquee Daolun Chen Department of Mechanical Engineering National Institute of Technology SrinagarSrinagar 190006India Department of Mechanical Industrialand Mechatronics EngineeringToronto Metropolitan UniversityTorontoM5B 2K3Canada Department of Mechanical Engineering Jamia Millia IslamiaNew Delhi 110025India

This study investigates the surface properties of the dissimilar AA7075/Mg-WE43 joints wherein the effect of positioning the AA7075 on the advancing or retreating sides during friction stir welding(FSW)was *** EBSD analysis revealed that the average grain size reduced from 4.11±0.7μm to 2.04±0.9μm when AA7075 was shifted from advancing to retreating *** results showed that positioning AA7075 on the retreating side significantly reduced the wear rate from 0.41 mm^(3)/Nm to 0.27 mm^(3)/Nm and mitigates the problem of brittle intermetallic compound(IMC)formation,consequently reducing the average *** resistance improved from 77.59 mpy to 56.299 *** higher grain refinement improved wear resistance due to higher grain boundary density and greater chances of formation of protective oxide *** current work thus enhances the practical applicability of AA7075/Mg-WE43 welds for lightweighting of automotive structures.

关键词： Surface properties Wear Microhardness Corrosion

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