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Wake Effects on A Hybrid Semi-Submersible Floating Wind Farm with Multiple Hub Heights

China Ocean engineering 2023年第1期37卷 101-114页

作者： XU Xiao-sen GU Jia-yang LING Hong-jie YANG Pu-yi WANG Shuai-shuai XING Yi-han Oleg GAIDAI ZHANG Zhong-yu Marine Equipment and Technology Institute Jiangsu University of Science and TechnologyZhenjiang 212100China Department of Mechanical and Civil Engineering Florida Institute of TechnologyMelbourne 32901United States Department of Marine Technology Norwegian University of Science and TechnologyTrondheim 7491Norway Department of Mechanical and Structural Engineering and Materials Science University of StavangerStavanger 4021Norway College of Engineering Science and Technology Shanghai Ocean EngineeringShanghai 201306China

Wind farms generally consist of a single turbine installed with the same hub height. As the scale of turbines increases,wake interference between turbines becomes increasingly significant, especially for floating wind turbines(FWT).Some researchers find that wind farms with multiple hub heights could increase the annual energy production(AEP),while previous studies also indicate that wake meandering could increase fatigue loading. This study investigates the wake interaction within a hybrid floating wind farm with multiple hub heights. In this study, *** is employed to simulate a hybrid wind farm which consists of four semi-submersible FWTs(5MW and 15MW) with two different hub heights. Three typical wind speeds(below-rated, rated, and over-rated) are considered in this paper to investigate the wake meandering effects on the dynamics of two FWTs. Damage equivalent loads(DEL) of the turbine critical components are computed and analyzed for several arrangements determined by the different spacing of the four turbines. The result shows that the dynamic wake meandering significantly affects downstream turbines’ global loadings and load effects. Differences in DEL show that blade-root flapwise bending moments and mooring fairlead tensions are sensitive to the spacing of the turbines.

关键词： hybrid floating wind farm wake meandering multiple hub heights floating wind turbine FAST.Farm fatigue

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Development of Fe-Mn-Si-Cr-Ni shape memory alloy with ultrahigh mechanical properties and large recovery strain by laser powder bed fusion

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Journal of materials science & Technology 2023年第19期150卷 201-216页

作者： Xiao Yang Lijin Cheng Huabei Peng Bingnan Qian Lei Yang Yunsong Shi Annan Chen Zhengyan Zhang Libin Zhao Ning Hu Chunze Yan Yusheng Shi State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Mechanical Engineering Hebei University of TechnologyTianjin 300401China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China School of Transportation and Logistics Engineering Wuhan University of TechnologyWuhan 430070China Department of Orthopaedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China

This work systematically studied the effect of volumetric energy density E on the densification,mi-crostructures,tensile mechanical properties,and shape memory performance of a Fe-Mn-Si-Cr-Ni shape memory alloy(SMA)fabricated by laser powder bed fusion(L-PBF).An E of 90-265 J/mm3 is suggested to fabricate the Fe-Mn-Si-Cr-Ni SMA with minor metallurgical defects and a high relative density of above 99%.The increase in E can promote the formation of the primaryγaustenite and the solid phase trans-formation from the primaryδferrite to theγaustenite,which helps to achieve a nearly complete y austenitic *** increase in E also contributes to fabricating the Fe-Mn-Si-Cr-Ni SMA with superior comprehensive mechanical properties and shape memory performance by *** Fe-Mn-Si-Cr-Ni SMA with a combination of good ductility of around 30%,high yield strength of above 480 MPa,an ultrahigh ultimate tensile strength of above 1 GPa,and large recovery strain of about 6%was manu-factured by L-PBF under a high E of 222-250 J/mm^(3).The good shape memory effect,excellent compre-hensive mechanical properties,and low cost of Fe-Mn-Si-Cr-Ni SMAs,as well as the outstanding ability to fabricate complex structures of L-PBF technology,provide a solid foundation for the design and fabri-cation of novel intelligent structures.

关键词： Shape memory alloys Fe-Mn-Si-based alloys Laser powder bed fusion mechanical property Microstructure

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Beyond p-y method:A review of artificial intelligence approaches for predicting lateral capacity of drilled shafts in clayey soils

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Journal of Rock Mechanics and Geotechnical engineering 2024年第9期16卷 3812-3840页

作者： M.E.Al-Atroush A.E.Aboelela Ezz El-Din Hemdan Civil and Environmental Engineering Program Engineering Management DepartmentCollege of EngineeringPrince Sultan UniversityRiyadhSaudi Arabia Department of Structural Engineering Faculty of EngineeringAin Shams UniversityCairoEgypt Structure and Materials Research Lab Prince Sultan UniversityRiyadhSaudi Arabia Computer Science and Engineering Department Faculty of Electronic EngineeringMenoufia UniversityMenoufiaEgypt

In 2023,pivotal advancements in artificial intelligence(AI)have significantly *** that in mind,traditional methodologies,notably the p-y approach,have struggled to accurately model the complex,nonlinear soil-structure interactions of laterally loaded large-diameter drilled *** study undertakes a rigorous evaluation of machine learning(ML)and deep learning(DL)techniques,offering a comprehensive review of their application in addressing this geotechnical challenge.A thorough review and comparative analysis have been carried out to investigate various AI models such as artificial neural networks(ANNs),relevance vector machines(RVMs),and least squares support vector machines(LSSVMs).It was found that despite ML approaches outperforming classic methods in predicting the lateral behavior of piles,their‘black box'nature and reliance only on a data-driven approach made their results showcase statistical robustness rather than clear geotechnical insights,a fact underscored by the mathematical equations derived from these ***,the research identified a gap in the availability of drilled shaft datasets,limiting the extendibility of current findings to large-diameter *** extensive dataset,compiled from a series of lateral loading tests on free-head drilled shaft with varying properties and geometries,was introduced to bridge this *** paper concluded with a direction for future research,proposes the integration of physics-informed neural networks(PINNs),combining data-driven models with fundamental geotechnical principles to improve both the interpretability and predictive accuracy of AI applications in geotechnical engineering,marking a novel contribution to the field.

关键词： Laterally loaded drilled shaft load transfer and failure mechanisms Physics-informed neural networks(PINNs) P-y curves Artificial intelligence(AI) Dataset

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Excitations in layered materials from a non-empirical Wannier-localized optimally-tuned screened rangeseparated hybrid functional

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npj Computational materials 2024年第1期10卷 132-140页

作者： María Camarasa-Gómez Stephen E.Gant Guy Ohad Jeffrey B.Neaton Ashwin Ramasubramaniam Leeor Kronik Department of Molecular Chemistry and Materials Science Weizmann Institute of ScienceRehovoth7610001Israel Department of Physics University of CaliforniaBerkeleyCA94720USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCA94720USA Kavli Energy NanoSciences Institute at Berkeley University of CaliforniaBerkeleyCA94720USA Department of Mechanical and Industrial Engineering University of Massachusetts AmherstAmherstMA01003USA Materials Science and Engineering Graduate Program University of MassachusettsAmherstAmherstMA01003USA

Accurate prediction of electronic and optical excitations in van der Waals(vdW)materials is a long-standing challenge for density functional *** recent Wannier-localized optimally-tuned screened range-separated hybrid(WOT-SRSH)functional has proven successful in non-empirical determination of electronic band gaps and optical absorption spectra for covalent and ionic ***,for vdW materials the tuning of the material-and structure-dependent functional parameters has only been attained ***,we present a non-empirical WOT-SRSH approach applicable to vdW materials,with the optimal functional parameters transferable between monolayer and *** apply this methodology to prototypical vdW materials:black phosphorus,molybdenum disulfide,and hexagonal boron nitride(in the latter case including zero-point renormalization).We show that the WOT-SRSH approach consistently achieves accuracy levels comparable to experiments and many-body perturbation theory(MBPT)calculations for band structures and optical absorption spectra,both on its own and as an optimal starting point for MBPT calculations.

关键词： theory optimal functional

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Tailoring BaCe_(0.7)Zr_(0.1)(Dy_(0.1)|Yb_(0.1))_(0.2)O_(3-δ)electrolyte through strategic Cu doping for low temperature proton conducting fuel cells:Envisioned theoretically and experimentally

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Journal of Energy Chemistry 2025年第2期101卷 692-701,I0015页

作者： Zaheer Ud Din Babar Muhammad Bilal Hanif Yan'an Li Wan-Ting Wang Hanchen Tian Cheng-Xin Li State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049ShaanxiChina Department of Inorganic Chemistry Faculty of Natural SciencesComenius University Bratislava84215 BratislavaSlovakia

This study addresses the challenge of high sintering temperatures in proton-conducting fuel cells(PCFCs)with BaCeO_(3)-doped *** demonstrate that 1 mol%copper(Cu)doping at the B-site of BaCe_(0.7)Zr_(0.1)(Dy_(0.1)|Yb_(0.1))_(0.2)O_(3-δ)(BCZDYb)improves sintering behavior,enabling densification at1400℃.However,Cu doping disrupts stoichiometry,creating barium vacancies and reducing protonaccepting cations,affecting overall *** mechanism is confirmed through density functional theory(DFT)calculations and various experimental techniques,including crystal structure analysis using X-ray diffraction(XRD)and morphology and elemental analysis via field emission scanning electron microscopy(FESEM)and energy-dispersive X-ray spectroscopy(EDS).Electrochemical measurements are performed using the electrochemical impedance spectroscopy(EIS).The ionic conductivity of1 mol%Cu-doped BCZDYb(BCZDYb-1)is 1.49×10^(-2)S cm^(-1)at 650℃,which is~3.58 times higher than that of BCZDYb sintered at 1200℃.The BCZDYb-1 exhibits~16 times higher grain boundary conductivity when sintered at 1400℃,compared to undoped *** single cell employing BCZDYb-1 as the electrolyte achieved a power density of~606 mW cm^(-2)at 550℃.These results indicate that a controlled amount of Cu doping can enhance densification while maintaining high ionic co nductivity,making it suitable for practical applications in PCFCs operating at lower temperatures.

关键词： Proton conducting fuel cells(PCFCs) Sintering Densification Cu-doping Electrical conductivity BaCe_(0.7)Z_(0.1)(Dy_(0.1)/Yb_(0.1))_(0.2)O_(3-δ)(BCZDYb)

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Evolution of microstructures during isothermal annealing in hot-rolled Al-Mn alloys

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Keikinzoku/Journal of Japan Institute of Light Metals 2025年第3期75卷 137-143页

作者： Torigoe, Shoma Nakashima, Yosuke Tsuzuki, Yusho Takata, Ken Ikeda, Ken-Ichi Ii, Seiichiro Department of Mechanical Engineering Daido University 10-3 Takiharucho Minami-ku Aichi Nagoya-shi457-8530 Japan Department of Mechanical Engineering Daido University Aichi Nagoya-shi Japan Division of Materials Science and Engineering Faculty of Engineering Hokkaido University Hokkaido Sapporo-shi Japan Ibaraki Tsukuba-shi Japan

Effect of annealing in hot-rolled Al-Mn alloys on evolution of microstructures was investigated using hardness measurement, electrical-resistivity measurement, backscattered electron images, and its image analysis. Electrical resistivity with annealing time exhibited that residual content of solute Mn and Fe atoms remained in hot-rolled alloys, and that their number was decreased during annealing. Analysis of backscattering electron image of scanning electron microscopy provided that a lot of precipitates grew by consumption of such solute atoms. We considered that the growth of precipitates during isothermal annealing affect recovery and recrystallization and then hardness behavior. © 2025 The Japan Institute of Light Metals.

关键词： Manganese alloys

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Green supercapacitor patterned by synthesizing MnO/laser-induced-graphene hetero-nanostructures on wood via femtosecond laser pulses

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Biochar 2024年第1期6卷 641-654页

作者： Young-Ryeul Kim Han Ku Nam Younggeun Lee Dongwook Yang Truong-Son Dinh Le Seung-Woo Kim Sangbaek Park Young-Jin Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Science TownDaejeon 34141South Korea. Department of Materials Science and Engineering Chungnam National University(CNU)99 Daehak-roYuseong-guDaejeon 34134South Korea.

Eco-friendly next-generation energy storage devices with high energy density are required to meet the increasing demand for sustainable and green ***,their manufacturing requires a lot of chemical precursors and is usually accompanied by chemical waste;it also involves laborious and time-consuming processes such as mixing,heat treating,casting,and ***,we proposed that mass production of microsupercapacitors(MSCs)for green electronics can be achieved by embedding manganese monoxide(MnO)on wood-derived laser-induced-graphene(LIG)via femtosecond laser direct writing(FsLDW)*** direct synthesis of MnO/LIG hetero-nanostructures on wood was realized by drop-casting a small amount of precursor between the first and second *** preceding FsLDW thermochemically converted wood into LIG while the following FsLDW converted the precursor into MnO,resulting in MnO/LIG ***-fabricated MnO/LIG MSC exhibited enhanced areal capacitance(35.54 mF cm^(−2)at 10 mV s^(−1))and capacitance retention(approximately 82.31%after 10,000 cycles)with only a small inclusion of Mn sources(0.66 mg cm^(−2))and short production time(10 min cm^(−2)),which attributes to operate light-emitting diodes,digital clocks,and electronic paper as *** approach enables the green,facile,fast,and cost-effective fabrication of future sustainable energy storage devices from biomass for next-generation green electronics.

关键词： Laser-induced graphene Green energy storage Microsupercapacitors Laser direct writing Ultrafast pulse Biomass

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Modelling of Shallow Drawing of Aluminium Alloy AA2014 Thin Sheet Using FE Simulations

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Journal of The Institution of Engineers (India): Series D 2023年第2期104卷 699-704页

作者： Narender, G. Ramjee, E. Janaki Ramulu, Perumalla Eswara Prasad, N. Department of Mechanical Engineering Vignan Institute of Technology and Science Hyderabad508 284 India Department of Mechanical Engineering JNTUH College of Engineering Hyderabad500 085 India School of Mechanical Chemical and Materials Engineering Adama Science and Technology University Adama Ethiopia DRDO Kanpur208 013 India

The aluminium alloy exhibits excellent isotropy in mechanical properties, with good weldability and corrosion/oxidation resistance, and shows limited shallow drawing formability. In this paper, forming characteristics of aluminium alloy AA2014 forged sheet are systematically investigated using numerical simulation, based on elasto-plastic deformation parameters using Finite Element Analysis (FEA) code PAM-STAMP 2G. Parameters like blank diameters at three levels with five varied coefficients of friction using an optimized mesh size are used to model and simulate the shallow drawing process of AA2014 alloy sheet of 1 mm thickness. The stress distribution, the maximum and minimum principal stresses, the strain distribution, and variation in thickness during cup formation have been determined by simulation. The thickness variation along with strain distributions from the simulated data has been compared and validated, as also for punch forces and displacements. The FE simulation results of variation in punch force outcomes of the experiment were found to be in good accord. © 2022, The Institution of Engineers (India).

关键词： Aluminum alloys

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Sound innovations for biofabrication and tissue engineering

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Microsystems & Nanoengineering 2024年第6期10卷 1-19页

作者： Mengxi Wu Zhiteng Ma Zhenhua Tian Joseph T.Rich Xin He Jianping Xia Ye He Kaichun Yang Shujie Yang Kam W.Leong Luke P.Lee Tony Jun Huang School of Mechanical Engineering Dalian University of TechnologyDalian 116086 LiaoningChina Thomas Lord Department of Mechanical Engineering and Materials Science Duke UniversityDurhamNC 27708USA Department of Mechanical Engineering Virginia Polytechnic Institute and State UniversityBlacksburgVA 24060USA Department of Biomedical Engineering Duke UniversityDurhamNC 27708USA Renal Division and Division of Engineering in Medicine Department of MedicineBrigham and Women’s HospitalHarvard Medical SchoolBostonMA 02115USA Department of Biomedical Engineering Columbia UniversityNew YorkNY 10027USA

Advanced biofabrication techniques can create tissue-like constructs that can be applied for reconstructive surgery or as in vitro three-dimensional(3D)models for disease modeling and drug *** various biofabrication techniques have recently been widely reviewed in the literature,acoustics-based technologies still need to be *** rapidly increasing number of publications in the past two decades exploring the application of acoustic technologies highlights the tremendous potential of these *** this review,we contend that acoustics-based methods can address many limitations inherent in other biofabrication techniques due to their unique advantages:noncontact manipulation,biocompatibility,deep tissue penetrability,versatility,precision in-scaffold control,high-throughput capabilities,and the ability to assemble multilayered *** discuss the mechanisms by which acoustics directly dictate cell assembly across various biostructures and examine how the advent of novel acoustic technologies,along with their integration with traditional methods,offers innovative solutions for enhancing the functionality of *** technologies are poised to address fundamental challenges in biofabrication and tissue engineering and show promise for advancing the field in the coming years.

关键词： acoustics limitations innovative

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A review of control strategies used for morphing aircraft applications

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Chinese Journal of Aeronautics 2024年第4期37卷 436-463页

作者： Muhammed S.PARANCHEERIVILAKKATHIL Jafar S.PILAKKADAN Rafic M.AJAJ Mohammadreza AMOOZGAR Davood ASADI Yahya ZWEIRI Michael I.FRISWELL Department of Aerospace Engineering Khalifa University of Science and TechnologyAbu DhabiUnited Arab Emirates Department of Aerospace Engineering Advanced Research and Innovation Center(ARIC)Khalifa University of Science and TechnologyAbu DhabiUnited Arab Emirates Department of Mechanical Materials&Manufacturing EngineeringUniversity of NottinghamNottingham NG72RDUK Department of Aerospace Engineering Adana Alparslan Turkes Science and Technology UniversityTurkey College of Engineering Swansea UniversitySwansea SA18ENUK

This paper reviews the various control algorithms and strategies used for fixed-wing morphing aircraft applications. It is evident from the literature that the development of control algorithms for morphing aircraft technologies focused on three main areas. The first area is related to precise control of the shape of morphing concepts for various flight conditions. The second area is mainly related to the flight dynamics, stability, and control aspects of morphing aircraft. The third area deals mainly with aeroelastic control using morphing concepts either for load alleviation purposes and/or to control the instability boundaries. The design of controllers for morphing aircraft/wings is very challenging due to the large changes that can occur in the structural, aerodynamic, and inertial characteristics. In addition, the type of actuation system and actuation rate/speed can have a significant effect on the design of such controllers. The aerospace community is in strong need of such a critical review especially as morphing aircraft technologies move from fundamental research at a low Technology Readiness Level(TRL) to real-life applications. This critical review aims to identify research gaps and propose future directions. In this paper, research activities/papers are categorized according to the control strategy used. This ranges from simple Proportional Integral Derivative(PID) controllers at one end to complex robust adaptive controllers and deep learning algorithms at the other end. This includes analytical, computational, and experimental studies. In addition, the various dynamic models used and their fidelities are highlighted and discussed.

关键词： Control strategies Morphing aircraft Shape morphing Flight dynamics Aeroelasticity

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