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20th CIRP Conference on Modeling of Machining Operations in Mons, CIRP CMMO 2025

作者： Nutte, Matthias Rivière-Lorphèvre, Edouard Dambly, Valentin Arrazola, Pedro-José Lazoglu, Ismail Granjon, Aurélie Ducobu, François Machine Design and Production Engineering Lab Research Institute for Science and Material Engineering UMONS Mons7000 Belgium Mechanical and Manufacturing Department Faculty of Engineering Mondragon Unibertsitatea Loramendi 4 Arrasate-Mondragón20500 Spain Manufacturing and Automation Research Center Koc University Istanbul34450 Turkey Sobelcomp SPRL Rue de l'économie 13 Loncin 4431 Belgium

Mechanistic models, established on experimental data, are recognized for their precision and simplicity in implementation. In this context of milling, the modeling of cutting forces, specifically radial and tangential components, has been extensively explored for unidirectional carbon fiber-reinforced polymer (UD-CFRP) parts. These models account for the anisotropic nature of fiber-reinforced polymers (FRPs), with cutting coefficients that vary based on the instantaneous cutting angle. However, due to the inherent flexibility of these materials, primarily attributed to their low thickness, axial cutting forces must also be incorporated to accurately represent the phenomena occurring during the machining process. This study develops a model for calculating cutting forces in three spatial directions for UD-GFRPs (unidirectional Glass Fiber-reinforced polymers). Building on an existing model from the literature for UD-CFRP, this new version introduces several modifications. First, the model validated for CFRPs must be extended to GFRPs. Secondly, the model must be extended from two dimensions to three dimensions. Finally, to ensure that the model includes only the actual contributions of the trimming operation, machining tests will be performed using only the rolling teeth. The cutting coefficients are modelled as a periodic function with a fundamental period of π. A first-order Fourier series was chosen for this purpose. Fourier series parameters are identified from the milling forces measured during a set of slotting operations at three feed rates and four fiber orientations. While the average levels of cutting forces are accurately modelled for both slotting and shoulder milling (with 50% immersion in up milling), the modeling of force amplitudes still requires improvement. © 2025 The Author(s).

关键词： Slotting

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Continuous Lithium-Ion Extraction From Seawater and Mine Water With a Fuel Cell System and Ceramic Membranes

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Energy & Environmental materials 2024年第6期 258-265页

作者： Cansu K?k Lei Wang Jean Gustavo A.Ruthes Antje Quade Matthew E.Suss Volker Presser INM-Leibniz Institute for New Materials Department of Materials Science & Engineering Saarland University Leibniz Institute for Plasma Science and Technology Faculty of Mechanical Engineering Technion-Israel Institute of Technology Wolfson Department of Chemical Engineering Technion-Israel Institute of Technology Grand Technion Energy Program Technion-Israel Institute of Technology Saarene-Saarland Center for Energy Materials and Sustainability

The demand for electronic devices that utilize lithium is steadily increasing in this rapidly advancing technological *** high-purity lithium in an environmentally friendly way is challenging by using commercialized ***,we propose the first fuel cell system for continuous lithium-ion extraction using a lithium superionic conductor membrane and advanced *** fuel cell system for extracting lithium-ion has demonstrated a twofold increase in the selectivity of Li+/Na+while producing electricity.

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Unveiling the effect of molybdenum and titanium co-doping on degradation and electrochemical performance in Ni-rich cathodes

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materials Reports(Energy) 2025年第1期5卷 32-42页

作者： Imesha Rambukwella Konstantin L.Firestein Yanan Xu Ziqi Sun Shanqing Zhang Cheng Yan School of Mechanical Medicaland Process EngineeringQueensland University of TechnologyBrisbaneQLD4000Australia Centre for Material Science Queensland University of TechnologyBrisbaneQLD4000Australia Central Analytical Research Facility Queensland University of TechnologyBrisbaneQLD4000Australia School of Chemistry and Physics Queensland University of TechnologyBrisbaneQLD4000Australia Institute for Sustainable Transformation School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhou510006China

In this work,we have applied molybdenum(Mo)and titanium(Ti)co-doping to solve the degradation of Ni-rich *** modified cathode,i.e.,Li(Ni_(0.89)Co_(0.05)Mn_(0.05)Mo_(0.005)Ti_(0.005))O_(2) holds a stable structure with expanded crystal lattice distance which improves Li ion diffusion *** dopants have suppressed the growth of primary particles,formed a coating on the surface,and promoted the elongated ***,the mechanical strength of these particles has increased,as confirmed by the nanoindentation test,which can help suppress particle *** detrimental H2-H3 phase transition has been postponed by 90 mV allowing the cathode to operate at a higher voltage.A better cycling stability over 100 cycles with 69%capacity retention has been *** believe this work points out a way to improve the cycling performance,Coulombic efficiency and capacity retention in Ni-rich cathodes.

关键词： Ni-rich cathode Mo doping Ti doping Degradation Unsymmetrical phase transition mechanical stress Particle cracking

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An expandable chamber for safe brain retraction: new technologies in the field of transcranial endoscopic surgery

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Journal of Zhejiang University-science B(Biomedicine & Biotechnology) 2023年第4期24卷 326-335页

作者： Elena ROCA Anna GOBETTI Giovanna CORNACCHIA Oscar VIVALDI Barbara BUFFOLI Giorgio RAMORINO Head and Neck Department NeurosurgeryIstituto Ospedaliero Fondazione Poliambulanza25124 BresciaItaly Technology for Health PhD Program University of Brescia25124 BresciaItaly Materials Science and Technology at Department of Mechanical and Industrial Engineering University of Brescia25123 BresciaItaly Metallurgy at Department of Mechanical and Industrial Engineering University of Brescia25123 BresciaItaly Anatomy and Physiopathology Division Department of Clinical and Experimental SciencesUniversity of Brescia25123 BresciaItaly

Neurosurgery is a highly specialized field:it often involves surgical manipulation of noble structures and cerebral retraction is frequently necessary to reach deep-seated brain *** are still no reliable methods preventing possible retraction *** objective of this study was to design work chambers well suited for transcranial endoscopic surgery while providing safe retraction of the surrounding brain *** chamber is designed to be inserted close to the intracranial point of interest;once it is best placed it can be *** should guarantee an appreciable workspace similar to that of current neurosurgical *** experimental aspect of this study involved the use of a force sensor to evaluate the pressures exerted on the brain tissue during the retraction *** pterional craniotomy,pressure measurements were made during retraction with the use of a conventional metal spatula with different *** that,although the force values necessary for retraction and exerted on the spatula by the neurosurgeon are the same,the local pressure exerted on the parenchyma at the edge of the spatula at different inclinations varied greatly.A new method of cerebral retraction using a chamber retractor(CR)has been designed to avoid any type of complication due to spatula edge overpressures and to maintain acceptable pressure values exerted on the parenchyma.

关键词： Brain retraction Spatula Brain retractor design Brain retraction injury Retraction complication Transcranial endoscopic surgery

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Intelligent identification of pollutant types and concentrations based on image processing and optical technology

Intelligent identification of pollutant types and concentrat...

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2023 JSAP-Optica Joint Symposia, JSAP 2023

作者： Chan, Tsung-Ta Wang, Chih-Chung Hsu, Hung-Wei Ho, Chao-Ching Kao, Feng-Sheng Chu, Jen-You Li, Jia-Han Department of Engineering Science and Ocean Engineering National Taiwan University Taipei106319 Taiwan Graduate Institute of Manufacturing Technology Department of Mechanical Engineering National Taipei University of Technology Taipei10608 Taiwan Material and Chemical Research Laboratories Industrial Technology Research Institute Hsinchu310401 Taiwan

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PnP Operations to Maintain Persistent Feasibility in Linear Constrained Systems

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IFAC-PapersOnLine 2023年第2期56卷 11377-11382页

作者： Richard Arlen Hall Dr. Leila Bridgeman Thomas Lord Dept of Mechanical Engineering & Material Science Duke University Durham NC United States of America

Multi-agent systems often have high dimensional state and input spaces that change rapidly as agents join and leave the system. The plug-and-play (PnP) design paradigm provides a framework to design controllers in this context by shifting most computations for individual agents to design-time. Smaller, numerically tractable PnP algorithms are then used to allow the agents to join and leave the network while maintaining persistent feasibility and stability. In constrained systems, persistent feasibility is assured within feasible control invariant (CI) sets. This work develops a PnP framework to compute these sets for a class of distributed, non-cooperative linear systems. The agents are allowed a preview of the cross-disturbance but no other restrictions are placed on the agents’ controllers. At design-time, undisturbed and maximally disturbed CI sets are found for each agent individually. As the network changes, the agents’ current CI sets are computed using linear combinations of these extreme CI sets. With this, on-line constraint adjustments can be accomplished through distributed optimization problems that scale well for large networks. The overall solution is agnostic to the local controller design and accounts for the local states at the time of the PnP operations.

关键词： Plug-and-play Control of constrained systems Decentralized and distributed control persistent feasibility Linear systems Time-varying systems Disturbance rejection

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Altering polythiophene derivative substrates to explore the mechanism of heterogeneous lithium nucleation for dendrite-free lithium metal anodes

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Journal of Energy Chemistry 2021年第8期30卷 63-68,I0003页

作者： Yanchen Fan Yi Zhao Shuang Li Yue Liu You Lv Yuan Zhu Rong Xiang Shigeo Maruyama Hao Zhang Qianfan Zhang School of Materials Science and Engineering Beihang University100191 BeijingChina Department of Mechanical Engineering The University of Tokyo113-8656 Japan School of Material Science and Engineering Beijing Institute of Technology100081 BeijingChina School of Chemistry and Biological Engineering University of Science and Technology100083 BeijingChina School of Microelectronics Southern University of Science and TechnologyShenzhen 518055China

Lithium metal batteries(LMBs)possess outstanding theoretical energy density and have attracted widespread attention as the next generation of energy storage devices for various crucial ***,the commercialization of LMBs has to simultaneously overcome numerous challenges,such as inferior Coulombic efficiency and cycling performance,high self-discharge,and complicated interfacial *** has traditionally been an enormous challenge about the uniform deposition of lithium on the surface of current collector to relieve the formation of lithium *** this study,a novel efficient strategy of plating uniform lithiophilic polythiophene derivatives substrates on Cu foils was developed and the nucleation mechanism of Li ions on polythiophene derivatives substrates was further *** first explored the interaction between polythiophene derivatives substrates and Li ions by firstprinciples calculations,and found shorter side chains of polythiophene derivatives can enhance the adsorption energy and promote the diffusion rate of Li *** derivatives substrates have a large number of dispersive lipophilic sites and Li ions diffusion channels in the main chain,which can effectively regulate the nucleation and growth stages of Li ions *** further found polythiophene derivatives with different side chains can induce the electrodeposition of Li ions with different morphology,while the polythiophene derivatives with the shortest side chains can contribute to the most excellent cycle efficiency,resulting in a uniform lithium deposition with less lithium dendritic growth experimentally.

关键词： First-principles calculations Lithium metal batteries Nucleation mechanism

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Construction, modeling, and control of a three-beam prototype using interactive fiber rubber composites

Construction, modeling, and control of a three-beam prototyp...

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93rd Annual Meeting of the International Association of Applied Mathematics and Mechanics, GAMM 2023

作者： Acevedo-Velazquez, Aline Iobana Keshtkar, Najmeh Mersch, Johannes Katzer, Konrad Cherif, Chokri Zimmermann, Martina Gerlach, Gerald Röbenack, Klaus Institute of Control Theory Faculty of Electrical and Computer Engineering TUD Dresden University of Technology Dresden Germany Institute of Solid-State Electronics Faculty of Electrical and Computer Engineering TUD Dresden University of Technology Dresden Germany Fraunhofer Institute for Material and Beam Technology IWS Dresden Germany Institute for Material Science Faculty of Mechanical Engineering TUD Dresden University of Technology Dresden Germany Institute of Textile Machinery and High Performance Material Technology Faculty of Mechanical Engineering TUD Dresden University of Technology Dresden Germany

In this contribution, we discuss the construction, modeling, and control of a three-beam prototype that utilizes interactive fiber rubber composites integrated with shape memory alloys (SMAs) as actuators. These actuators are integrated into a textile layer and covered with an elastomer layer, providing flexibility and protection to the prototype. A mathematical model was developed to describe the behavior of the prototype, employing system identification techniques. However, precise position control of systems actuated by SMAs is challenging due to their inherent nonlinearities and hysteretic behavior. To tackle this challenge, a proportional-integral (PI) controller was designed based on robust stability conditions. The effectiveness of the designed PI controller was validated through both numerical simulations and real experiments. © 2023 The Authors. Proceedings in Applied Mathematics & Mechanics published by Wiley-VCH GmbH.

关键词： Actuators

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ENHANCING THE ELECTROCATALYTIC HYDROGEN EVOLUTION ACTIVITY OF BARE COPPER ELECTRODES THROUGH ULTRAFAST FEMTOSECOND LASER NANOSTRUCTURING 23

ENHANCING THE ELECTROCATALYTIC HYDROGEN EVOLUTION ACTIVITY O...

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23rd World Hydrogen Energy Conference: Bridging Continents by H2, WHEC 2022

作者： Ahmad, Shahbaz Egilmez, Mehmet Orhan, Mehmet F. Alnaser, Ali S. Material Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Department of Physics American University of Sharjah Sharjah United Arab Emirates Department of Mechanical Engineering American University of Sharjah Sharjah United Arab Emirates

ISBN: (纸本)9786250008430

In this study, we report on enhancing the surface area of bare copper electrodes via femtosecond laser processing for its application in alkaline water electrolysis. It is shown that the laser nanostructuring process creates unique and hierarchal nanostructures superimposed over spiky microstructures. Analysing the effect of various laser parameters indicate that scanning speed greatly effects the microstructures by decreasing its dimensions and increasing porosity. The results also shows that laser processing has significantly enhanced the surface area with spiky and superhydrophilic structures. Furthermore, this process is expected to improve the hydrogen evolution reaction (HER) kinetics by allowing more electrode to electrolyte interface, which can favor the enrichment and formation of protons on structured Cu cathode. © 2022 Proceedings of WHEC 2022 - 23rd World Hydrogen Energy Conference: Bridging Continents by H2. All rights reserved.

关键词： Femtosecond lasers

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Highly Thermally Stable, Highly Electrolyte-Wettable Hydroxyapatite/Cellulose Nanofiber Hybrid Separators for Lithium-Ion Batteries

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ACS Applied Energy materials 2023年第7期6卷 3862-3871页

作者： Liu, Yi Li, Chunxing Li, Chao Liang, Zhenye Hu, Xueshan Liu, Hao Zhang, Ze Cui, Meng Chen, Gang Wan, Jiayu Zhang, Xiangwu Tao, Jinsong State Key Lab of Pulp and Paper Engineering South China University of Technology Guangzhou510640 China SUSTech Energy Institute for Carbon Neutrality Southern University of Science and Technology Shenzhen518055 China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen518055 China Fiber and Polymer Science Program Department of Textile Engineering Chemistry and Science Wilson College of Textiles North Carolina State University RaleighNC27695-8301 United States

Separators have an important influence on the safety and performance of lithium-ion batteries (LIBs). However, traditional polyolefin-based separators suffer from poor thermal stability and weak electrolyte wettability. Here, by using hydroxyapatite (HAP) and cellulose nanofibers (CNFs) as raw materials, we fabricated a unique HAP/CNF hybrid separator. The separators exhibit excellent thermal properties, with high thermal stability (up to 250 °C) and outstanding flame retardancy. The separators also demonstrate excellent electrolyte wettability. Compared to polypropylene (PP) separators, the HAP/CNF separators show a smaller contact angle with electrolytes, 17.2° for HAP/CNF and 45.5° for PP. Meanwhile, the HAP/CNF separators illustrate an excellent smoothness of 68.0 nm. In addition, the batteries assembled with the hybrid separators display a better performance compared with the batteries assembled with commercial PP separators. The raw materials are green, and the fabrication processes are free of organic solvents. We envision that the HAP/CNF hybrid separator could be a promising separator candidate for next-generation high-safety and high-performance LIBs. © 2023 American Chemical Society.

关键词： Thermodynamic stability

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