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Manufacturing technology 2024年第4期24卷 532-538页

作者： Chvojka, Martin Kreibich, Viktor Kudláček, Jan Czech technical university in Prague Faculty of mechanical engineering Department of manufacturing technology Technická 4 Prague Czech Republic

The paper focuses on a novel and perspective surface treatment technology called Plasma Electrolytic Oxidation (PEO) applied to aluminium and its alloys. This innovative technology generates layers with specific properties, particularly suitable for tribological and heat-resistant applications. Plasma Electrolytic Oxidation technology represents an alternative to conventional oxidation methods, offering high utility properties and presenting a completely new approach to surface modification. © 2024 Manufacturing technology. All rights reserved.

关键词： Aluminum corrosion

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A Rapid Image Comparison Approach to Automatic Recognition and Assembly of Jigsaw Puzzles

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International Journal of Precision engineering and Manufacturing 2024年第7期25卷 1403-1414页

作者： Ke, Yi-Wen Lin, Alan C. Department of Mechanical Engineering National Taiwan University of Science and Technology 43 Keelung Road Section 4 Taipei106 Taiwan

This paper proposes a method for quick recognition of jigsaw puzzles using a small number of samples, solely relying on image processing and template matching techniques. In the preliminary stage, this paper proposes a segmentation approach to divide the jigsaw puzzle into individual pieces with partial features, obtaining template data for each puzzle piece. Subsequently, scattered puzzle pieces are captured using a camera, and their contours are extracted to acquire puzzle image data. The puzzle images are then matched with the template data, employing polar coordinate transformation during the matching process to reduce computational time. The matching process also identifies the puzzle piece's number and orientation. Finally, the matching results are integrated with a robotic arm to complete the task of puzzle assembly. This paper not only outlines the generation of puzzle image data and template data through image processing but also elaborates on the determination of corresponding numbers and orientations during image matching. The feasibility of this method is validated through different types of puzzles, and its applicability to industrial parts is also examined for practicality. © The Author(s), under exclusive licence to Korean Society for Precision engineering 2024.

关键词： Robotic arms

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Active flutter suppression for light sport aircraft by a control surface split

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CEAS Aeronautical Journal 2024年第4期15卷 977-998页

作者： Kratochvíl, Aleš Valenta, Jakub Department of Aerospace Engineering Faculty of Mechanical Engineering Center of Advanced Aerospace Technology Czech Technical University in Prague Technicka 4 Prague 616607 Czech Republic

A new method of active flutter suppression is present in the paper and aims at the Light Sport Aircraft category, where it has never been used, designed, or even considered. The novelty of the method lies in splitting the control surface into a part controlled by a pilot with purely mechanical control and into a part controlled by a servo-actuator with a controller. The control law of the actuator is designed to follow the pilot-controlled part of the control surfaces and damp unstable oscillations if they occur. The controller design for flutter suppression is focused on achieving simple solutions. The request for simplicity is important for easy acquisition of airworthiness during a certification process and easy implementation by producers. The contribution of this paper also lies in the analysis of flutter suppression capability based on the varying active control surface span. The results show that it is not necessary to use the entire area of a control surface for active flutter suppression. A mathematical model based on a real aircraft is developed and verified for the simulation of active flutter suppression. In addition, control law design and simulations of the dynamic response are performed. The robustness of the control law and aircraft controllability in the case of active control surface malfunction is investigated. © The Author(s) 2024.

关键词： Controllers

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Mathematical model of non-generated straight bevel gears based on a four-axis CNC machine

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International Journal of Advanced Manufacturing technology 2024年第9-10期132卷 5005-5016页

作者： Shih, Yi-Pei Chen, Guang-Yu Department of Mechanical Engineering National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Rd. Taipei106335 Taiwan

High-precision straight bevel gears are commonly manufactured using the generating method, which requires specialized equipment such as a dedicated or five-axis CNC machine for mass production. While the existing forming process can also be applied to produce SBGs, which offers a more cost-effective solution with a four-axis CNC machine, it results in inferior gear contact performance. This paper introduces a novel forming (non-generating) method. The goal is to enhance the gear contact performance. First, the tool profile of the pinion is computed based on the ring gear’s conjugate tooth surface. Subsequently, a sensitivity analysis on the tooth surface, considering four-axis motion coefficients, facilitates the calculation of correction amounts for tooth cutting motion. This process determines the pinion’s tooth surface, optimizing the contact performance by ensuring it contacts the ring gears precisely at a point. Ease-off and tooth contact analyses are utilized to evaluate the contact performance of the designed gear pair. Furthermore, VERICUT software is employed for cutting simulation to validate the NC machining codes. After this, a cutting experiment is conducted to verify the correctness of our mathematical model. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2024.

关键词： Cost effectiveness

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Optimizing soybean biofuel blends for sustainable urban medium-duty commercial vehicles in India: an AI-driven approach

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Environmental Science and Pollution Research 2024年第22期31卷 32449-32463页

作者： Rajak, Upendra Chaurasiya, Prem Kumar Verma, Tikendra Nath Dasore, Abhishek Ağbulut, Ümit Meshram, Kundan Saleel, CAhamed Saboor, Shaik Cuce, Erdem Mian, Zhibao Department of Mechanical Engineering RGM College of Engineering and Technology Nandyal518501 India Department of Mechanical Engineering National Institute of Technology Raipur492010 India Department of Mechanical Engineering Maulana Azad National Institute of Technology Vellore462003 India Department of Biological and Agricultural Engineering Faculty of Engineering Universiti Putra Malaysia Selangor UPM Serdang43400 Malaysia Department of Mechanical Engineering Faculty of Mechanical Engineering Yildiz Technical University Istanbul34349 Turkey Department of Civil Engineering Guru Ghasidas Vishwavidyalaya Bilaspur India Department of Mechanical Engineering College of Engineering King Khalid University Abha61421 Saudi Arabia School of Mechanical Engineering Vellore Institute of Technology Vellore Tamil Nadu Vellore632014 India Department of Mechanical Engineering Faculty of Engineering and Architecture Recep Tayyip Erdogan University Zihni Derin Campus Rize53100 Turkey School of Engineering and the Built Environment Birmingham City University BirminghamB4 7XG United Kingdom Faculty of Science and Engineering School of Computer Science University of Hull Cottingham Road HullHU6 7RX United Kingdom Center for Research Impact & amp Outcome Chitkara University Punjab Rajpura140401 India

This article presents the outcomes of a research study focused on optimizing the performance of soybean biofuel blends derived from soybean seeds specifically for urban medium-duty commercial vehicles. The study took into consideration elements such as production capacity, economics and assumed engine characteristics. For the purpose of predicting performance, combustion and emission characteristics, an artificial intelligence approach that has been trained using experimental data is used. At full load, the brake thermal efficiency (BTE) dropped as engine speed increased for biofuel and diesel fuel mixes, but brake-specific fuel consumption (BSFC) increased. The BSFC increased by 11.9% when diesel compared to using biofuel with diesel blends. The mixes cut both maximum cylinder pressure and NOx emissions. The biofuel-diesel fuel proved more successful, with maximum reduction of 9.8% and 22.2 at rpm, respectively. The biofuel and diesel blend significantly improved carbon dioxide (CO2) and smoke emissions. The biofuel blends offer significant advantages by decreeing exhaust pollutants and enhancing engine performance. Graphical Abstract: (Figure presented.) © The Author(s) 2024.

关键词： Diesel engines

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Investigation of in vitro bioactivity, and osteoblast and angiogenic activity of spray-dried boron-doped 58S bioactive glass microspheres

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RSC Advances 2023年第51期13卷 36071-36078页

作者： Vietanti, Frizka Lee, Tzu-An Tseng, Hsiu-Yang Chou, Yu-Jen Department of Mechanical Engineering National Taiwan University of Science and Technology No. 43 Sec. 4 Keelung Road Taipei10607 Taiwan

Bioactive glass is a potential biomaterial for bone reconstruction owing to its superior bioactivity and non-toxicity. Yet, the absence of a circulatory system to carry waste and nutrients is a key issue with biomaterials implanted in the body. Thus the development of functional and vascularized new tissue requires the development of angiogenesis, which involves the formation of new blood vessels. Based on this perspective, we aimed to fabricate boron-doped 58S bioactive glass microspheres using the spray drying method, which could offer great flowability, controllable morphology, and narrow size distribution. Characterization of particle morphology and elemental composition were examined using scanning electron microscopy along with energy dispersive spectroscopy, respectively. To evaluate the effect of the boron dopant on in vitro bioactivity, X-ray diffraction and Fourier transform infrared spectroscopy were employed, while MC3T3-E1 osteoblast cells and BAOEC endothelial cells were used to assess the in vitro osteoblast and angiogenic activities, respectively. Finally, the results showed that two distinct morphologies, smooth and concave spheres, were found, with discussion of the corresponding formation mechanism. In addition, positive effects of the boron dopant were demonstrated on the in vitro bioactivity, and osteoblast and angiogenic activity when compared to the un-doped BG specimen. © 2023 The Royal Society of Chemistry.

关键词： Boron

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Assessment of higher demand of household energy consumption in different households in India: an inter-comparative study and solar savings valuation

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Environmental Science and Pollution Research 2024年 1-26页

作者： Saxena, Abhishek Sagade, Atul A. Cuce, Erdem Singh, Desh Bandhu Kumar, Avnish Gupta, Parul Mechanical Engineering Department School of Engineering Dev Bhoomi Uttarakhand University Dehradun India Departamento Ingeniería Mecánica facultad de ingenieria Universidad de Tarapacá Arica Chile Department of Mechanical Engineering Recep Tayyip Erdogan University Zihni Derin Campus Rize53100 Turkey Uttarakhand Dehradun India India Department of Mechanical Engineering Global Institute of Technology & ampManagement Haryana Gurgaon India Department of Mechanical Engineering College of Engineering Birmingham City University BirminghamB4 7XG United Kingdom

The present work focuses on a detailed inter-comparative assessment of household energy consumption (HEC) patterns for different Indian households including their living style and pattern of using clean energy fuels. This assessment has been done for cooking, heating, cooling, and transportation patterns in different households. It has been observed that the monthly income, family size, and house location have a significant effect on the monthly HEC of a specific household. Besides the complete assessment of HEC, results of the present study also show the potential of solar energy applications through which rural poor households and lower-income households can save approximately $10.77 to $14.36 monthly while urban households can save $17.95 to $29.92 monthly. Rural side medium-income households can save about $10.77 to $14.36 in cooking and about $11.97 to $16.76 monthly in space heating, cooling, and lighting, while urban medium-income households can save about $17.95 to $29.92 monthly. Likely, rural high-income households or rich households can save about $11.97 to $16.76 in cooking, and about $17.95 to $29.92 monthly in space heating, cooling, and lighting while urban high-income households can save about $29.92 to $53.86 monthly. Rich households can save up to $23.94 in cooking, and up to $95.75 monthly in space heating, cooling, and lighting. A complete formulization of the theoretical assessment of HEC has been discussed in this study. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Energy utilization

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Modelling, simulation, and experiments of 4D printed twisting actuator

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Materials Today: Proceedings 2023年 101卷 43-50页

作者： Pathan, Muhammadzahid Devaramani, Rajeshwari Adinarayanappa, Somashekara M. Additive Manufacturing and 4D Printing Laboratory Department of Mechanical Materials and Aerospace Engineering Indian Institute of Technology Dharwad Dharwad 580011 India

Since its introduction, 4D (4 Dimensional) printing has sparked a lot of attention and applications in various fields. Unlike 3D (3 Dimensional) printing, 4D printing allows the printed item to alter shape and function over time when environmental variables change, such as temperature, light, electricity, and water. 4D printing technologies and materials have advanced rapidly in the last few years. As per market reports, the 4D printing sector will be worth about USD 313.1 million by 2025. The report attributes this exponential rise in the market to the high demand for 4D materials in the military, defense, aerospace, and healthcare industries. This study introduces the design and manufacturing method of a 4D printed twisting actuator with Shape Memory Alloy (SMA) integrated with the static 3D printed flexible matrices. Test models were printed with an SMA called Nitinol embedded in the experimental part. Numerical simulation (ANSYS) was carried out to analyze the shape recovery rate of the twisted actuator. Subsequently, numerical results were validated with experimental results. Our investigation reveals that this twisting wrist actuator is lightweight, shows good repeatability, and is capable of full shape recovery in about 4 s with an input current supply of 28 Amp. With its unique twisting ability, this embedding mechanism can be leveraged in industrial production to make robotic arms more dynamic and versatile. © 2023 Elsevier Ltd. All rights reserved.

关键词： Actuators

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Ultra-strong and ductile precipitation-strengthened high entropy alloy with 0.5%Nb addition produced by laser additive manufacturing

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Journal of Materials Science & technology 2024年第20期187卷 195-211页

作者： Wei Zhang Ali Chabok Hui Wang Jiajia Shen J.P.Oliveira Shaochuan Feng Nobert Schell Bart J.Kooi Yutao Pei Advanced Production Engineering Engineering and Technology Institute GroningenFaculty of Science and EngineeringUniversity of GroningenNijenborgh 49747 AGthe Netherlands Nanostructured Materials and Interfaces Zernike Institute for Advanced MaterialsFaculty of Science and EngineeringUniversity of GroningenNijenborgh 49747 AGthe Netherlands UNIDEMI Department of Mechanical and Industrial EngineeringNOVA School Science and TechnologyUniversidade NOVA de LisboaCaparica 2829-516Portugal CENIMAT/I3N Department of Materials ScienceNOVA School of Science and TechnologyUniversidade NOVA de Lisboa2829-516 CaparicaPortugal School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Institute of Materials Physics Helmholtz-Zentrum HereonMax-Planck-Str.1GeesthachtD-21502Germany

Achieving a superior strength-ductility combination for fcc single-phase high entropy alloys(HEAs)is *** present work investigates the in-situ synthesis of Fe_(49.5)Mn_(30)Co_(10)Cr_(10)C_(0.5)interstitial solute-strengthened HEA containing 0.5 wt.%Nb(hereafter referred to as iHEA-Nb)using laser melt-ing deposition(LMD),aiming at simultaneously activating multiple strengthening *** effect of Nb addition on the microstructure evolution,mechanical properties,strengthening and deformation mechanisms of the as-deposited iHEA-Nb samples was comprehensively *** levels of het-erogeneity were observed in the LMD-deposited microstructure,including different grain sizes,cellular subgrain structures,various carbide precipitates,as well as elemental *** incorporation of Nb atoms with a large radius leads to lattice distortion,reduces the average grain size,and increases the types and fractions of carbides,aiding in promoting solid solution strengthening,grain boundary strengthening,and precipitation *** test results show that the Nb addition significantly increases the yield strength and ultimate tensile strength of the iHEA to 1140 and 1450 MPa,respectively,while maintaining the elongation over 30%.Deformation twins were generated in the tensile deformed samples,contributing to the occurrence of twinning-induced *** outstanding combination of strength and ductility exceeds that for most additively manufactured HEAs reported to date,demon-strating that the present in situ alloying strategy could provide significant advantages for developing and tailoring microstructures and balancing the mechanical properties of HEAs while avoiding conventional complex thermomechanical *** addition,single-crystal micropillar compression tests revealed that although the twining activity is reduced by the Nb addition to the iHEA,the micromechanical prop-erties of grains with different orientations were signi

关键词： Laser additive manufacturing High entropy alloy In situ alloying Precipitation strengthening Deformation mechanism mechanical properties

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Fabrication and fracture behaviors of the continuous brittle fiber reinforced tungsten composites fabricated via field-assisted sintering technology

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Tungsten 2025年第1期7卷 172-182页

作者： Rui Shu Yi-Ran Mao Jan W. Coenen Alexis Terra Stephan Sch?nen Johann Riesch Christian Linsmeier Christoph Broeckmann Juelich Research Center Institute of Energy and Climate Research Plasma Physics (IEK-4) Partner in the Trilateral Euregio Cluster Institute of Materials Applications in Mechanical Engineering (IWM) RWTH Aachen University Department of Nuclear Engineering & Engineering Physics University of Wisconsin Madison Central Institute of Engineering Electronics and Analytics Engineering and Technology (ZEA-1) Juelich Research Center Max Planck Institute for Plasma Physics Institute of Materials Applications in Mechanical Engineering IWM RWTH Aachen University

Tungsten（W） is a promising candidate material for the plasma-facing components in future fusion ***,it has issues regarding the intrinsic brittleness as well as operational *** fiber reinforced tungsten（W_f/W） composites overcome these issues by using extrinsic toughening *** to neutron irradiation and high-temperature recrystallization during fusion operation,the ductility of the fibers may degrade over a long period of ***,it is necessary to investigate the fracture behavior of W_f/W composites with brittle *** the present work,the tungsten fibers were embrittled by ***,the continuous brittle W_f/W composite with yttrium oxide（Y2O3） interface was fabricated by the field-assisted sintering technology *** microstructure of the prepared W_f/W composites was *** fracture behavior and toughening mechanisms were discussed in detail based on the experimental results of 3-point bending tests and the corresponding finite element *** composites show a pseudo-ductile fracture *** are hindered and deflected by the de-bonded fiber-matrix *** extrinsic toughening mechanisms of interface de-bonding,crack bridging,and fiber pull-out are *** indicates the reinforcement concept still works even though all components in the W_f/W are brittle.

关键词： Interface Fracture behavior Numerical simulation W_f/W composites Field-assisted sintering technology(FAST)

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