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Littérature scientifique sur le sujet « FSCW »

Auteur : Grafiati

Publié le 1 avril 2023

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Articles de revues sur le sujet "FSCW"

Muteba, Mbika, Adisa A. Jimoh et Dan V. Nicolae. « Performance Analysis of Induction Machines with Unconventional Winding Configurations ». Applied Mechanics and Materials 260-261 (décembre 2012) : 337–41. http://dx.doi.org/10.4028/www.scientific.net/amm.260-261.337.

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This paper presents the performance of fractional slots distributed windings (FSDW) and fractional slots concentrated windings (FSCW) of three-phase squirrel cage induction machines. The different windings have been designed and modeled using the same machine physical and electrical parameters. The Finite Element Model (FEM) of the machine for the different windings has been carried out. The results for the machine with FSDW and FSCW are compared to the results of the conventional double layer (CDL) with 8/9 chorded coil.

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Hu, Xiaobin, Chen Lu et Xiaoqing Zhu. « A Simplified Model for Dynamic Response Analysis of Framed Self-Centering Wall Structures under Seismic Excitations ». Shock and Vibration 2019 (15 avril 2019) : 1–14. http://dx.doi.org/10.1155/2019/2360150.

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This paper presents a simplified model for dynamic response analysis of the framed self-centering wall (FSCW) structure under seismic excitations. In the analysis model, the frame is equivalent as a single-degree-of-freedom system and collaborates with the self-centering (SC) wall to resist lateral loads. By way of pushover analysis of a typical FSCW structure, the proposed analysis model is validated by comparing the analysis results with those obtained from the finite element analysis method. Using the analysis model, motion equations of the FSCW structure under seismic excitations are established and solved through numerical simulations. Finally, a comprehensive parametric study is conducted to investigate the effects of a variety of design parameters on seismic responses of the FSCW structure. It shows that improving the yield force or elastic stiffness of the frame can help greatly lessen seismic responses of the FSCW structure in terms of the rotation angle of the SC wall.

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Liu, Suying, et Jinlin Huang. « Multi-objective optimization of a spoke-type permanent magnet motor with fractional-slot concentrated windings for EVs ». COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 40, n^o 3 (26 juillet 2021) : 561–78. http://dx.doi.org/10.1108/compel-08-2020-0278.

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Purpose This paper aims to propose a spoke-type fractional-slot concentrated windings (FSCW) PM machine for EVs driving system to improve torque density. To further improve electromagnetic performance, the multi-objective optimization design is processed based on response surface (RS) model and simulated annealing cuckoo search (SA-CS) algorithm. Design/methodology/approach The spoke-type FSCW PM machine is designed and optimized to meet the requirement of EVs driving system. First, a spoke-type FSCW PM machine is designed and some of key parameters are obtained based on equivalent magnetic circuit (EMC) method. Then, the RS model and modified SA-CS algorithm are proposed to obtain higher torque, lower torque ripple and higher efficiency. Findings After verification by finite element method for no-load and load performance, the optimal machine has higher torque density, lower torque ripple and higher efficiency compared with initial machine. Finally, a 20 kW prototype is manufactured and tested to verify the validity of the proposed optimization design method. Originality/value This paper designs a high torque density spoke-type FSCW PM machine, which is superior for EVs driving system. Meanwhile, a novel modified SA-CS algorithm is applied to the field of electrical machine multi-objective optimal design.

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Jedryczka, Cezary, Wojciech Szelag et Zbigniew Jerry Piech. « Multiphase permanent magnet synchronous motors with fractional slot windings ». COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 35, n^o 6 (7 novembre 2016) : 1937–48. http://dx.doi.org/10.1108/compel-03-2016-0120.

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Purpose The purpose of this paper is to investigate advantages of multiphase permanent magnet synchronous motors (PMSM) with fractional slot concentrated windings (FSCW). The investigation is based on comparative analysis and assessment of FSCW PMSM wound as 3, 6, 9 and 12 phase machines suited for low speed applications. Design/methodology/approach The investigations are focussed on distortions of back electromotive (emf) and magnetomotive force (mmf) with the torque ripples and motors’ performance taken into account. The finite element models with the aid of customized computer code have been adopted for motor winding design and back emf, mmf and motor performance analyses. Findings The novel multiphase winding layouts were found to offer lower content of sub-harmonics in the mmf waveforms compared with the traditional three-phase machine designs. Moreover, the investigated multiphase machines exhibited higher average value of the electromagnetic torque, while the multiphase PMSM machines with FSCW were further characterized by significantly lower torque pulsations. Originality/value The analyses presented in this paper demonstrate that PMSM with FSCW are advantageous to their counterpart three-phase machines. Specifically, they offer higher performance and are more suitable to work with multiple drives supplying segmented winding system. This ability of using multi-drive supply for one motor offers flexibility and cost reduction while increasing fault tolerant power train system.

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Clark, James H., Lucie A. Pfaltzgraff, Vitaliy L. Budarin, Andrew J. Hunt, Mark Gronnow, Avtar S. Matharu, Duncan J. Macquarrie et James R. Sherwood. « From waste to wealth using green chemistry ». Pure and Applied Chemistry 85, n^o 8 (27 mars 2013) : 1625–31. http://dx.doi.org/10.1351/pac-con-12-09-01.

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The availability of chemically rich food supply chain waste (FSCW) gives it considerable potential as a resource for the manufacture of chemicals including materials and fuels. By applying clean chemical technologies to the extraction and conversion of molecules from FSCW, we can aim to produce genuinely green and sustainable products to help meet the legislative and consumer-oriented demands of a sustainable society. Low-temperature microwave (MW) processing is a particularly powerful technology to achieve this aim and is shown to be effective for several different high-volume, geographically diverse biomass types.

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Wang, Aimeng, et Shanshan Li. « Investigation of E-Core Modular Permanent Magnet Wind Turbine ». Energies 13, n^o 7 (6 avril 2020) : 1751. http://dx.doi.org/10.3390/en13071751.

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Under the adverse trend of fossil energy attenuation and air pollution, wind power effectively alleviates the global energy crisis and environmental pollution. For wind turbines, especially large offshore wind turbines, their transportation, installation, and maintenance are very inconvenient. In order to solve this problem, this paper presents an E-core stator modular machine which inserts stator gap into the unwounded teeth of the fractional-slot concentrated winding (FSCW) permanent magnet (PM) machine. The winding factor of the new stator structure machine was derived. The electromagnetic models of 12-slot/10-pole and 12-slot/14-pole modular FSCW PM machines and traditional FSCW PM machines were established using the finite element analysis (FEA) software, and the open-circuit flux density, cogging torque, load torque, loss, and efficiency were simulated and analyzed. The results showed that the modular structure of E-core stator not only simplified the transportation, installation, and maintenance of wind turbines, but also optimized the electromagnetic performance of the 12-slot/14-pole machine, i.e., improved the output torque and operation efficiency.

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Jędryczka, Cezary, Dawid Danielczyk et Wojciech Szeląg. « Torque Ripple Minimization of the Permanent Magnet Synchronous Machine by Modulation of the Phase Currents ». Sensors 20, n^o 8 (23 avril 2020) : 2406. http://dx.doi.org/10.3390/s20082406.

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This paper deals with the torque ripple minimization method based on the modulation of the phase currents of the permanent-magnet synchronous motor (PMSM) drive. The shape of the supply current waveforms reducing the torque ripple of the machine considered was determined on the basis of finite element analysis (FEA). In the proposed approach, the machine is supplied by a six-leg inverter in order to allow for the injection of zero sequence current harmonics. Two test PMSMs with fractional-slot concentrated windings (FSCW) and surface-mounted permanent magnets (SPMs) have been examined as a case study problem. Wide-range fractional analyses were performed using developed numerical models of the electromagnetic field distribution in the considered machines. The results obtained show that the level of torque ripple in FSCW PMSMs can be effectively reduced by the modulation of the phase currents under the six-leg inverter supply.

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Maskell, D. L., et G. S. Woods. « A frequency modulated envelope delay FSCW radar for multiple-target applications ». IEEE Transactions on Instrumentation and Measurement 49, n^o 4 (2000) : 710–15. http://dx.doi.org/10.1109/19.863911.

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Wang, Keyi, et Heyun Lin. « Modular Permanent Magnet Synchronous Machine with Low Space Harmonic Content ». Energies 13, n^o 15 (31 juillet 2020) : 3924. http://dx.doi.org/10.3390/en13153924.

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Modularity technique is desirable in large permanent magnet synchronous machines (PMSMs) because it facilitates manufacture, assembly, and maintenance. Although the PMSMs with fractional-slot concentrated windings (FSCWs) allow their stators to be modularized, they usually suffer from high nonworking space harmonic content. The PMSMs with various reported two-slot pitch windings (TSPWs) show much lower nonworking space harmonic content, but they do not support stator modularity. This paper proposes a modular PMSM with a special dual three-phase (DTP) TSPW, which exhibits quite low nonworking space harmonic content. First, the topology of the proposed machine is described in detail. Then, the mechanism of reducing the nonworking space harmonic content of the machine is expounded through winding magnetomotive force (MMF) analysis. Finally, the electromagnetic characteristics of a specific proposed modular PMSM and a conventional modular PMSM with DTP-FSCW are compared by finite element method (FEM), in terms of electromotive force (EMF), armature reaction field, torque performance, efficiency and power factor. The FEM results demonstrate that the proposed machine can realize low space harmonic content while retaining stator modularity.

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Gabov, Viktor, Dmitrii Shishliannikov, Aleksandr Korolev, Aleksei Mikriukov et Aleksandr Muravskii. « Rationale for the efficient design of a face scraper-type cutting conveyor ». Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal, n^o 1 (20 février 2023) : 46–54. http://dx.doi.org/10.21440/0536-1028-2023-1-46-54.

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Introduction. The article considers mechanized underground coal mining efficiency improvement by providing rationale for the efficient design of face scraper conveyors (FSC). It is shown that the creation of FSC adaptive to mining, geological and technological conditions that change as the extraction columns are developed, contributes to the stable operation of mechanized mining complexes for coal mining under continuous operation. Methods of research. As a matter of convenient FSC development and structure analysis, it is advisable to use structural formulae that display functional elements and their relationships in the conveyor design. The construction principle is described and examples of structural formulas are given for the existing FSCs. The factors affecting the FSC structure are specified. Advanced designs of adaptive FSCs should be developed taking into account the possibility of fulfilling more main and auxiliary functions. The concept of a face scraper-type cutting conveyor (FSCC) has been introduced. Results. The structural formula of the FSCC adaptive to complex mining and geological operating conditions is substantiated. The schematic diagram and operation procedure for the FSCC proposed by the authors are described. The described technical solutions provide increased efficiency of coal mining and transportation processes and increased operating stability of the fully-mechanized longwall when operating in complex mining and geological conditions. Conclusions. FSCC systematization and analysis in terms of the functional elements structure and design makes it possible to look for implicit ways to improve these transporting machines, increase their adaptability and efficiency in changing mining, geological and technological operating conditions. The adaptive FSCC described in the article ensures effective profiling of ground in the mine working, intensification of the life-in of coal in the bottom-hole zone of the mined coal seam and separation of cargo flows during the selective extraction of coal and rock or advancing through the geological faults.

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Thèses sur le sujet "FSCW"

Oliveira, Pedro Henrique Freiria de. « Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA) ». Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/899.

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Universidade Federal de Minas Gerais
Polymeric components have been replacing traditional materials such as glass or metals in a wide range of applications due to their advantages, such as optimized specific strength (weight-to-strength ratio), reduced fabrication time and costs, and design flexibility. The increasing use of polymeric materials in engineering requires efficient and environmental friendly fabrication and processing technologies. Initially developed for metals, the Friction Stir Spot Welding (FSSW) is a joining technique with short process cycles, low energy consumption and no need of consumables. Friction Stir Spot Welding has excellent performance in welding of lightweight alloys, showing promising results in thermoplastic welding. This study investigates the relationships between friction stir spot welding parameters (tool rotational speed, plunge rate and dwell time) and weld properties (joint geometry, process temperature, microstructure, lap shear resistance and failure mechanisms) in polymethylmethacrylate (also known as PMMA) single-spot joints. PMMA friction stir spot welds showed similar mechanical performance in comparison to other current welding techniques, with equal or shorter welding cycle times. Differential scanning calorimetry and gel permeation chromatography analysis demonstrated that polymer degradation level in the weld region was negligible. The statistical models proposed for FSSW of PMMA showed good repeatability and reproducibility for the investigated material and welding ranges. Moreover, the feasibility of the Friction Spot Welding (FSpW) a new joining technology developed as a further improvement of the friction stir spot welding was successfully demonstrated in thermoplastic polymers for the first time worldwide. Sound FSpW-single lap joints on PMMA were produced and their properties studied within an exploratory study.
A busca por eficiência econômica e tecnologias ecologicamente corretas tem sido observada em praticamente todos os setores da produção industrial, desde o desenvolvimento de materiais, design de produtos e inclusive na área da soldagem. A soldagem ponto por fricção e mistura mecânica, FSSW (do inglês Friction Stir Spot Welding) e a Friction Spot Welding FSpW são técnicas de soldagem recentes e que têm sido amplamente empregadas na união de ligas metálicas leves, em que as soldas geralmente apresentam excelentes propriedades mecânicas. Além disso, ciclos de soldagem curtos, baixo consumo de energia e ausência de necessidade de adição de material ou elementos de soldagem são características positivas encontradas nesses novos processos. Na área de materiais poliméricos, entretanto, este é um novo e promissor assunto. Neste trabalho buscou-se investigar a relação entre os parâmetros do processo de soldagem por FSSW (velocidade de rotação da ferramenta, taxa de penetração e tempo de recalque) e as propriedades das juntas (geometria da solda, máxima temperatura processual, área afetada termicamente, resistência mecânica ao cisalhamento sob tensão e mecanismos de fratura) em placas de poli (metacrilato de metila). Foi possível observar a formação de juntas com resistência mecânica ao cisalhamento semelhante a outros processos atualmente utilizados na indústria, com tempos de ciclo de soldagem iguais ou inferiores a esses processos. As análises via calorimetria diferencial exploratória (DSC) e cromatografia por permeação em gel (GPC) demonstraram que os níveis de degradação termomecânica encontrados nas amostras foram insignificantes. A modelagem estatística do processo demonstrou a boa repetibilidade e reprodutibilidade dentro das condições estudadas. Nesse trabalho, também foi investigado através de um estudo exploratório, pela primeira vez, a viabilidade da nova técnica FSpW na soldagem de termoplásticos, demonstrando, com sucesso, a capacidade de obtenção de juntas de boa qualidade em PMMA.

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Gonçalves, Joel. « Soldagem pontual por fricção (FSpW) de poliamida 6 ». Universidade Federal de São Carlos, 2015. https://repositorio.ufscar.br/handle/ufscar/7314.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Friction Spot Welding (FSpW) is an innovative technique developed and patented in 2005 by the Helmholtz Zentrum Geesthacht (HZG) research center in Germany. FSpW uses the friction between a rotating tool and the workpieces to generate heat enough to cause diffusion across the interface to consolidate the weld. This new welding technology has been tested and optimized with the objective of produce overlap weld joints between two polyamide 6 plates. Full factorial design of experiments (24) and analysis of variance (ANOVA) allowed to explain the effects of weld parameters as rotational speed (RS), welding time (WT), plunge depth (PP), holding pressure time (HPT) and the interactions between these main parameters on the microstructural characteristics and mechanical strength of the joints. The rotational speed (RS) and welding time (WT), within the limits studied, had greater influence on the mechanical single lap shear strength of the joints that achieved up to 26 MPa. This behavior was related to the higher heat generation during the weld, reaching temperatures of up to 275°C, thereby increasing the welded area. The parameter holding pressure time (HPT), designed in this study allowed the cooling and solidification of the polymer under pressure, improving the weld surface finishing and avoiding defects as voids in the weld area. The most common failure for the joints with higher mechanical strength was the fracture of one of the plates while the joints with lower mechanical strength showed interface shear failure. The degree of crystallinity of PA6 in the welded area did not show a significant difference as compared to the base material. The molecular weight of PA6 in the welded area was reduced in the worst case 7% as compared to the base material (Mv = 41.800 g/mol), and that reduction occurred linearly with the increase of the temperature during the welding; however, that low degree of degradation was not found to affect the mechanical strength of the joints. These characteristics emphasize the potential of this FSpW as an alternative to the current welding methods for polyamide 6.
A Soldagem Pontual por Fricção (FSpW) foi desenvolvida e patenteada pela Helmholtz-Zentrum Geesthacht (HZG), na Alemanha. A FSpW é uma técnica de soldagem pontual que ocorre por meio da fricção de uma ferramenta, com movimentos rotacional e axial, através das amostras, gerando aquecimento suficiente para fundir e misturar localmente o(s) polímero(s), com posterior consolidação sob pressão. Este estudo teve como principal objetivo investigar o uso da FSpW na fabricação de juntas pontuais entre chapas de poliamida 6 (PA6) sobrepostas. Experimentos do tipo fatorial completo (24) e análise de variância (ANOVA) possibilitaram a compreensão dos efeitos dos parâmetros de soldagem, velocidade de rotação (VR), tempo de soldagem (TS), profundidade de penetração da ferramenta (PP), tempo de consolidação (TC), e de suas interações, sobre características microestruturais e a resistência mecânica das juntas. Os parâmetros velocidade de rotação (VR) e tempo de soldagem (TS), dentro dos limites estudados, apresentaram maior influência sobre a resistência mecânica das juntas, alcançando 26 MPa. Este comportamento foi relacionado à maior geração de calor durante a soldagem, atingindo temperaturas de até 275oC, consequentemente, aumentando a área soldada. A utilização do parâmetro tempo de consolidação (TC), idealizado neste estudo, possibilitou o resfriamento e solidificação do polímero sob pressão, melhorando o acabamento superficial da solda e evitando a formação de defeitos. Juntas com maiores valores de resistência ao cisalhamento sob tração apresentaram maior probabilidade de falha por fratura de uma das chapas, enquanto que juntas menos resistentes falharam por separação das chapas. O grau de cristalinidade da PA6 nas soldas não sofreu variação significativa e observou-se um decréscimo de até 7% na massa molar da PA6 em relação ao material de base (Mv = 41.800 g/mol) que ocorreu de forma linear com o aumento da temperatura durante a solda, porém essa alteração não comprometeu a resistência mecânica da solda.

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Kennard, Kirtis Frankland. « A Simple Method for Evaluating Wear in Different Grades of Tooling Applied to Friction Stir Spot Welding ». BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5529.

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In this study tools consisting of a 5mm cylindrical pin and a 12mm shoulder held by a simple tool holder were used to compare the wear of 11 tooling materials. The objective was to determine if using these tools in a spot welding configuration to simulate friction stir welding could differentiate the potential performance of tooling materials. All tools were made of varying percentages of polycrystalline cubic boron nitride (PCBN), tungsten (W) and rhenium (Re). The materials are referred to herein as GV1, GV2, G1, G2, G3, G4, G5, G6, G7, G8 and G9.The tools were run to 205 welds if they did not fracture first. The grades averaged the following quantities of welds before fracture failure GV-1:0; GV-2:200; G1:82; G2:204; G3:205; G4:205; G5:96; G7:102.73; G8:21.2; G9:38.5. Of the tools that ran the full 205 welds without chipping, the average calculated volume loss, which was the best indication of wear, was as follows G2:1.83%; G3:2.53%; G4:2.41%; G5:1.93%; and G7:2.30%.The study showed that G2 had the least wear and G6 had the most wear, of those tools that completed all 205 spot welds. Fracture was the failure mode of all grades with over 70% CBN content. It was found that small CBN grain size was not correlated to better wear performance, as has been seen in a prior study.

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Ziegler, Daniel (Daniel M. ). « Compiling Gallina to go for the FSCQ file system ». Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113460.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2017.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 85-87).
Over the last decade, systems software verification has become increasingly practical. Many verified systems have been written in the language of a proof assistant, proved correct, and then made runnable using code extraction. However, due to the rigidity of extraction and the overhead of the target languages, the resulting code's CPU performance can suffer, with limited opportunity for optimization. This thesis contributes CoqGo, a proof-producing compiler from Coq's Gallina language to Go. We created Go', a stylized semantics of Go which enforce linearity, and implemented proof-producing compilation tactics from Gallina to Go' plus a straightforward translation from Go' to Go. Applying a prototype of CoqGo, we compiled a system call in the FSCQ file system, with minimal changes to FSCQ's source code. Taking advantage of the increased control given by CoqGo, we implemented three optimizations, bringing the system call's CPU performance to 19% faster than the extracted version.
by Daniel Ziegler.
M. Eng.

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Matchett, Michael William. « Resolution of enantiomers using cyclodextrins in HPLC, FSCE and NMR ». Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307070.

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Heinrich, Bernd. « Auswirkungen der FSC-Zertifizierung auf die Waldrestholzbereitstellung ». Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-202319.

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Ali, Khaled Yousif. « Friction Stir Welding Between Similar and Dissimilar Materials ». Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1513857047779233.

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Karlsson, Alexandra. « Attityder till certifieringssystemen FSC och PEFC i skogsbranschen ». Thesis, Linnéuniversitetet, Institutionen för biologi och miljö (BOM), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-38481.

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Different groups in the forestry sector were likely to have different views regarding the responsibility for an environmentally sustainable forestry and the benefits of certification and this study aimed to examine the attitudes that existed in the forestry sector to the certification schemes FSC and PEFC. In the study a survey and a questionnaire were sent out to different groups. The investigation was made with respect to three groups: forest owners, forest contractors and employees working with the certification schemes on a daily basis at the forest company Södra. The groups agreed that the owner of the forest had the main responsibility for an environmentally sustainable forestry. The study revealed that all three groups highly valued the environmental aspect of certification. Forest owners also identified financial gain as a benefit. The forest contractors felt that the certification gave orderliness to their work but also saw an economic cost from being certified. The forest company employees found certification as an access to a widermarket with certified products. Half of the forest owners estimated their knowledge of the certification schemes to be inadequate while forest contractors and the employees of Södra valued their knowledge as sufficient. The forest owners had less education about the certification schemes than the other groups.
Olika grupper i skogsbranschen riskerar att ha olika syn när det gäller ansvaret för ett miljömässigt hållbart skogsbruk och nyttan med certifiering och den här studien gjordes för att undersöka vilka inställningar som fanns i skogsbranschen till certifieringssystemen FSC och PEFC. Arbetet gjordes med avseende på tre grupper: skogsägare, skogsentreprenörer och anställda som arbetar på skogsföretaget Södra med certifiering i sitt dagliga arbete. I studien skickades en enkät och ett frågeformulär ut. Undersökningen visade att de tre grupperna värderade miljömässigt hållbart skogsbruk med certifiering högt. Som skogsägare fick man en certifieringspremie för det certifierade virke som man sålde. Skogsägarna såg också en ekonomisk vinning med certifiering. Skogsentreprenörerna ansåg att certifiering i högre grad gav ordning och reda i deras arbete men att det fanns en ekonomisk kostnad med att vara certifierad. Skogsföretagsgruppen menade att certifierade produkter gav tillgång till en större marknad för skogsföretaget. Grupperna var överens om att ansvaret för ett miljömässigt hållbart skogsbruk låg på de/den som ägde skogsmarken. Samtidigt uppskattade hälften av skogsägarna att deras kunskaper om certifieringarna var otillräckliga medan skogsentreprenörerna och skogsföretagsgruppen ansåg att deras kunskaper var tillräckliga. Detta kunde bero på att skogsägarna fick mindre utbildning av certifiering än de andra två grupperna. Det här arbetet har visat att grupperna inte har olika syn när det gäller vikten av att ett miljömässigt hållbart skogsbruk bedrivs.

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Reese, Gregory A. « Dissimilar Friction Stir Welding Between Magnesium and Aluminum Alloys ». Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955097/.

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Joining two dissimilar metals, specifically Mg and Al alloys, using conventional welding techniques is extraordinarily challenging. Even when these alloys are able to be joined, the weld is littered with defects such as cracks, cavities, and wormholes. The focus of this project was to use friction stir welding to create a defect-free joint between Al 2139 and Mg WE43. The stir tool used in this project, made of H13 tool steel, is of fixed design. The design included an 11 mm scrolled and concave shoulder in addition to a 6 mm length pin comprised of two tapering, threaded re-entrant flutes that promoted and amplified material flow. Upon completion of this project an improved experimental setup process was created as well as successful welds between the two alloys. These successful joints, albeit containing defects, lead to the conclusion that the tool used in project was ill fit to join the Al and Mg alloy plates. This was primarily due to its conical shaped pin instead of the more traditional cylindrical shaped pins. As a result of this aggressive pin design, there was a lack of heat generation towards the bottom of the pin even at higher (800-1000 rpm) rotation speeds. This lack of heat generation prohibited the material from reaching plastic deformation thus preventing the needed material flow to form the defect free joint.

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Reilly, Aidan. « Modelling of friction stir spot welding ». Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/244946.

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Friction stir spot welding (FSSW) is a solid-state welding process which is especially useful for joining precipitation-hardened aluminium alloys that undergo adverse property changes during fusion welding. It also has potential as an effective method for solid-state joining of dissimilar alloys. In FSSW, heat generation and plastic flow are strongly linked, and the scale of the process in time and space is such that it is difficult to separate and control the influence of all the relevant input parameters. The use of modelling is well-established in the field of welding research, and this thesis presents an analysis of the thermal and mechanical aspects of FSSW, principally using the finite element (FE) technique. Firstly, a thermal FE model is shown, which is subsequently validated by reference to experimental temperature data in both aluminium-to-aluminium and aluminium-to-steel welds. Correlations between high-quality welds and temperature fields are established, and predictions are made for peak temperatures reached under novel welding conditions. Deformation and heating are strongly linked in FSSW, but existing modelling tools are poorly suited to modelling flow processes in the conditions extant in FSSW. This thesis discusses the development and optimisation of two novel techniques to overcome the limitations of current approaches. The first of these uses greatly simplified constitutive behaviour to convert the problem into one defined purely by kinematics. In doing so, the boundary conditions reduce to a small number of assumptions about the contact conditions between weld material and tool, and the model calculation time is very rapid. This model is used to investigate changes in the slip condition at the tool to workpiece interface without an explicit statement of the friction law. Marker experiments are presented which use dissimilar composition but similar strength alloys to visualise flow patterns. The layering behaviour and surface patterns observed in the model agree well with observations from these experiments. The second approach extends the FE method to include deformation behaviour without the need for a fully-coupled approach, guided by the kinematic model. This is achieved using an innovative sequential small-strain analysis method in which thermal and deformation analyses alternate, with each running at a very different timescale. This technique avoids the requirement to either remesh the model domain at high strains or to use an explicit integration scheme, both of which impose penalties in calculation time and model complexity. The method is used to relate the purely thermal analysis developed in the work on thermal modelling to welding parameters such as tool speed. The model enables predictions of the spatial and temporal evolution of heat generation to be made directly from the constitutive behaviour of the alloy and the assumed velocity profile at the tool-workpiece interface. Predictions of the resulting temperature history are matched to experimental data and novel conditions are simulated, and these predictions correlate accurately with experimental results. Hence, the model is used to predict welding outcomes for situations for which no experimental data exists, and process charts are produced to describe optimum welding parameters. The methods and results presented in this thesis have significant implications for modelling friction stir spot welding, from optimising process conditions, to integration with microstructural models (to predict softening in the heat-affected zone, or the formation of intermetallics at the interface in dissimilar welds). The technique developed for sequential small strain finite element analysis could also be investigated for use in other kinematically constrained solid-state friction joining processes.

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Livres sur le sujet "FSCW"

Mubiayi, Mukuna Patrick, Esther Titilayo Akinlabi et Mamookho Elizabeth Makhatha. Current Trends in Friction Stir Welding (FSW) and Friction Stir Spot Welding (FSSW). Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-92750-3.

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Council, Field Studies. FSC overseas experiences in 2003. Shrewsbury : FSC, 2003.

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Services, Information Handling, dir. FSC/locator code conversion tables. Englewood, Col : Information Handling Services, 1987.

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S, Oca Bernardo, dir. The Andrew B. Gonzalez, FSC reader. Malate, Manila, Philippines : De La Salle University Press, 1996.

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Salm, Luke. Brother Arnold Rèche, FSC, apostolic ascetic. Romeoville, Ill. (100 De La Salle Dr., Romeoville 60441-1896) : Christian Brothers Publications, 1986.

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New York (State). Legislature. Legislative Commission on the Modernization and Simplification of Tax Administration and the Tax Law. The New York tax treatment of DISCs and FSCs. [Albany] : The Commission, 1986.

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Salm, Luke. Brother Benilde Romançon, FSC : The teacher saint. Romeoville, Ill. (100 De La Salle Dr., Romeoville, Ill. 60441-1896) : Christian Brothers Publications, 1987.

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Malaysian FSC Consultative Study Working Group., dir. Forest stewardship council (FSC) : Malaysian consultative study : report. Petaling Jaya, Selangor, Malaysia : WWF Malaysia, 1993.

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Salm, Luke. Brother Mutien-Marie Wiaux, FSC : Sanctity in simplicity. Romeoville, Ill. (100 De La Salle Dr., Romeoville 60441-1896) : Christian Brothers Publications, 1989.

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Kirby, Leo. Brother Charles Henry Buttimer, FSC : Superior general, 1966-1976. Romeoville, Ill. (100 De La Salle Dr., Romeoville 60441-1896) : Christian Brothers Publications, 1985.

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Chapitres de livres sur le sujet "FSCW"

Issakov, Vadim. « FSCW Radar ». Dans Microwave Circuits for 24 GHz Automotive Radar in Silicon-based Technologies, 189–90. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13598-9_10.

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Gooch, Jan W. « FSCT ». Dans Encyclopedic Dictionary of Polymers, 328. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5333.

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Kok, L. J. J., Ken Poston et Gary Moore. « Bombardier Aerospace FSW Demonstrator ». Dans ICAF 2011 Structural Integrity : Influence of Efficiency and Green Imperatives, 73–81. Dordrecht : Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1664-3_5.

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Santos, Telmo G., Jorge Martins, Luis Mendes et Rosa M. Miranda. « Process Developments in FSW ». Dans Proceedings of the Eighth International Conference on Management Science and Engineering Management, 1015–21. Berlin, Heidelberg : Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55122-2_88.

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Liu, Xiaojun. « Forward-scattered Light (FSC) ». Dans Encyclopedia of Systems Biology, 757. New York, NY : Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4419-9863-7_1082.

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Mishra, Rajiv Sharan, Partha Sarathi De et Nilesh Kumar. « FSW of Aluminum Alloys ». Dans Friction Stir Welding and Processing, 109–48. Cham : Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07043-8_5.

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Raut, Niyati N., Vivek Yakkundi, Akshay Vartak et S. N. Teli. « Effect of Plunging and Dwelling Period on Temperature Profile and Energy Dissipation in FSSW and Its Relevance in FSW ». Dans Proceedings of International Conference on Intelligent Manufacturing and Automation, 211–20. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4485-9_22.

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Fraisse, Mateo Cariño. « FSC® forest management auditing ». Dans Forest Management Auditing, 187–200. Milton Park, Abingdon, Oxon ; New York, NY : Routledge, 2018. : Routledge, 2018. http://dx.doi.org/10.4324/9781315745985-13.

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Florian, Diego, Ilaria Dalla Vecchia et Mauro Masiero. « FSC® Forest Management Certification ». Dans Forest Management Auditing, 81–92. Milton Park, Abingdon, Oxon ; New York, NY : Routledge, 2018. : Routledge, 2018. http://dx.doi.org/10.4324/9781315745985-6.

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Meyghani, Bahman, et Mokhtar Awang. « Finite Element Modeling of FSW ». Dans Welding Simulations Using ABAQUS, 7–12. Singapore : Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1320-4_3.

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Actes de conférences sur le sujet "FSCW"

Korszeń, Karol, et Jarosław Dawidczyk. « Algorithms for data processing in FSCW systems ». Dans SPIE Proceedings, sous la direction de Ryszard S. Romaniuk. SPIE, 2007. http://dx.doi.org/10.1117/12.784847.

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Wu, Zhanchuan, Ying Fan, Honghui Wen et Dawei Gao. « Vibration Suppression of FSCW-IPM with Auxiliary Slots ». Dans 2018 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2018. http://dx.doi.org/10.1109/ecce.2018.8557390.

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Wang, Aimeng, et Yi Tian. « A Method for Improving Torque Density in FSCW PM Machines ». Dans 2019 19th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF). IEEE, 2019. http://dx.doi.org/10.1109/isef45929.2019.9097070.

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Kim, Nam-Ho, Chan-Ho Kim, Tae-Hyuk Ji, Yong-Jae Kim et Sang-Yong Jung. « Axial Flux Permanent Magnet FSCW Machine Decoupling Unbalance Magnetic Force ». Dans 2021 24th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2021. http://dx.doi.org/10.23919/icems52562.2021.9634454.

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Wang, Aimeng, et Dashuang Li. « Investigation of Coil Pitch Types in FSCW Interior PM Synchronous Machine ». Dans 2021 13th International Symposium on Linear Drives for Industry Applications (LDIA). IEEE, 2021. http://dx.doi.org/10.1109/ldia49489.2021.9505864.

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Dajaku, Gurakuq, Sachar Spas, Xhevat Dajaku et Dieter Gerling. « Comparison of two FSCW PM machines for integrated traction motor/generator ». Dans 2015 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, 2015. http://dx.doi.org/10.1109/iemdc.2015.7409058.

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Dajaku, Gurakuq, Volodymyr Bilyi et Dieter Gerling. « Feasibility analysis of an improved FSCW for synchronous reluctance traction machines ». Dans 2017 IEEE International Electric Machines and Drives Conference (IEMDC). IEEE, 2017. http://dx.doi.org/10.1109/iemdc.2017.8002041.

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Zhang, Hui, Oskar Wallmark et Mats Leksell. « On fault tolerance for IPM-FSCW machines adopting a modular converter ». Dans 2014 17th International Conference on Electrical Machines and Systems (ICEMS). IEEE, 2014. http://dx.doi.org/10.1109/icems.2014.7013739.

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Carrasco, Maitane, Amaia Lopez-de-Heredia et Irma Villar. « Comparison of Fault-tolerant control strategies for a nine-phase IPMSM-FSCW ». Dans 2020 IEEE Vehicle Power and Propulsion Conference (VPPC). IEEE, 2020. http://dx.doi.org/10.1109/vppc49601.2020.9330941.

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Wang, Aimeng, et Shengjun Wei. « Improved Sliding Mode Control of FSCW PM Machine for Electric Vehicle Application ». Dans 2019 19th International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering (ISEF). IEEE, 2019. http://dx.doi.org/10.1109/isef45929.2019.9097068.

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Rapports d'organisations sur le sujet "FSCW"

Gehler, Christopher P. Unity of Effort : Crisis Beyond the FSCL. Fort Belvoir, VA : Defense Technical Information Center, mai 1999. http://dx.doi.org/10.21236/ada381939.

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Marshall, David B. Reducing Fracture Tendencies in PCBN FSW Tools. Fort Belvoir, VA : Defense Technical Information Center, août 2009. http://dx.doi.org/10.21236/ada504865.

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Marshall, David. Reducing Fracture Tendencies in PCBN FSW Tools. Fort Belvoir, VA : Defense Technical Information Center, juillet 2010. http://dx.doi.org/10.21236/ada524909.

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Hall, Dewayne P. Integrating Joint Operations Beyond the FSCL. Is Current Doctrine Adequate ? Fort Belvoir, VA : Defense Technical Information Center, novembre 1997. http://dx.doi.org/10.21236/ada335397.

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Barry, II, et Robert F. Who's Zooming Who ? Joint Doctrine and the Army ; Air Force Debate Over the FSCL. Fort Belvoir, VA : Defense Technical Information Center, mai 1994. http://dx.doi.org/10.21236/ada284070.

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Borg, Lars E., Zurong Dai, Gary R. Eppich, Amy M. Gaffney, Victoria G. Genetti, Patrick M. Grant, Leonard W. Gray et al. Analysis of a Uranium Oxide Sample Interdicted in Slovakia (FSC 12-3-1). Office of Scientific and Technical Information (OSTI), janvier 2014. http://dx.doi.org/10.2172/1124874.

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CIFOR. Evaluasi dampak sertifikasi Forest Stewardship Council (FSC) terhadap pengelolaan hutan alam di daerah tropis. Center for International Forestry Research (CIFOR), 2013. http://dx.doi.org/10.17528/cifor/004347.

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Fothergill, David. Surface and 60 FSW Performance Testing of the Modified MBS 2000 Closed Circuit Oxygen Rebreather. Fort Belvoir, VA : Defense Technical Information Center, mars 2007. http://dx.doi.org/10.21236/ada465121.

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Swiergosz, M. J., et R. J. Steckel. Limited Unmanned Evaluation of the DIVEX SLS MK IV Backpack at Sea Level and 1000 FSW. Fort Belvoir, VA : Defense Technical Information Center, avril 2005. http://dx.doi.org/10.21236/ada443528.

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Kerce, Elyse W. Taylor-Leaver FSC (Family Service Center) : A Prototype for Program Evaluation of Navy Family Service Centers. Fort Belvoir, VA : Defense Technical Information Center, août 1988. http://dx.doi.org/10.21236/ada197536.

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