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showing 10 items of 2973 documents

New Forms of Work in the Light of Globalization in Software Development

2009

Globalization in software development introduced significant changes in the way organizations operate today. Software is nowadays produced by team members from geographically, temporally and culturally remote sites. Organizations seek for benefits that global market offers and face new challenges. Naturally resistant to change, these organizations often do not realize necessity for tailoring existing methods for distributed collaboration. Our empirical investigation shows a great variety in the ways organizations distribute responsibilities across remote sites and conclude that these can be divided into two main categories: joint collaboration that requires investments in team building and …

EngineeringKnowledge managementProgramvaruteknikGlobal software engineeringbusiness.industryTeam software processSoftware developmentSoftware EngineeringFace (sociological concept)Collaboration modelsOutsourcingVariety (cybernetics)GlobalizationSoftwareOffshoringWork (electrical)Forms of workJoint (building)business
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Identification of Defensive Performance Factors in the 2010 FIFA World Cup South Africa

2016

The aim of this study was to determine the efficacy of defensive play in elite football, to identify variables associated with the direct recovery of ball possession, and to propose a model for predicting the success of defensive transitions. We analyzed 804 transitions in the final stages of the Fedération Internationale Football Association (FIFA) World Cup 2010, and investigated the following variables using univariate, bivariate, and multivariate analyses: duration of defensive transition, possession loss zone, position of players at the start and end of the defensive transitions, defensive organization, general defensive approach, time of the match, position of defense, zone in which t…

EngineeringMultivariate analysisElite soccerPhysical Therapy Sports Therapy and RehabilitationBivariate analysisFootballArticleObservational methodology03 medical and health scienceslcsh:GV557-1198.9950302 clinical medicine0504 sociologySoccerObservació (Mètode científic)Orthopedics and Sports Medicineelite soccer; defensive phase; observational methodology; performance analysisObservation (Scientific method)performance analysisObservational methodologylcsh:Sportsbusiness.industry05 social sciencesdigestive oral and skin physiologyPerformance analysisOffensiveUnivariate050401 social sciences methodsAdvertising030229 sport sciencesDefensive phaseFutbolelite soccerPerformance indicatorobservational methodologybusinessSocial psychologyhuman activitiesdefensive phase
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Biomechanical analysis of the humeral tray positioning in reverse shoulder arthroplasty design

2017

Despite the widespread use of reverse total shoulder arthroplasty, the fundamental effects of implant configuration on certain biomechanical outcomes have not been completely elucidated especially for the most innovative prostheses. Aim of this work is to investigate the behaviour of a new reverse shoulder prosthesis, characterized by a humeral tray with a variable offset, designed to increase the range of motion and to reduce the impingement. The purposes of this study were to evaluate the effect of reverse shoulder implant design parameters on the deltoid muscle forces, required to produce abduction, and on the shoulder range of motion, in order to provide a more systematic understanding …

EngineeringOffset (computer science)medicine.medical_treatmentProsthesisIndustrial and Manufacturing Engineering03 medical and health sciences0302 clinical medicineDeltoid muscleVirtual prototypingmedicineCADReverse engineeringSettore ING-IND/15 - Disegno E Metodi Dell'Ingegneria IndustrialeReverse shoulder prosthesiFEM030222 orthopedicsbusiness.industryWork (physics)030229 sport sciencesArthroplastyFinite element methodTrayModeling and SimulationRange of motionbusinessBiomedical engineeringInternational Journal on Interactive Design and Manufacturing (IJIDeM)
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Robust output feedback ℌ<inf>∞</inf> control synthesis with pole placement for offshore wind turbine system: An LMI…

2012

This paper deals with output ℌ ∞ control synthesis for a linear parameter-varying model of a floating wind turbine. A nonlinear model is introduced and linearized to obtain a linear model for each desired azimuth angle using the wind turbine software FAST. The main contributions of this paper are threefold. Firstly, the family of linear models are represented based on an affine parameter-varying model structure. Secondly, the bounded parameter-varying parameters are removed using upper bounded inequalities in the control design process. Thirdly, the control problem is formulated in terms of linear matrix inequalities (LMIs). The simulation results show a comparison between a controller desi…

EngineeringOffshore wind powerMathematical optimizationbusiness.industryControl theoryLinear systemFull state feedbackLinear modelFloating wind turbineRobust controlbusinessTurbine2012 IEEE International Conference on Control Applications
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Installation of offshore wind turbines: A technical review

2021

Abstract The installation phase is a critical stage during the lifecycle of an offshore wind turbine. This paper presents a state-of-the-art review of the technical aspects of offshore wind turbine installation. An overview is first presented introducing the classification of offshore wind turbines, installation vessels, rules and regulations, and numerical modelling tools. Then, various installation methods and concepts for bottom-fixed and floating wind turbines are critically discussed, following the order of wind turbine foundations and components. Applications and challenges of the methods are identified. Finally, future developments in four technical areas are envisioned. This review …

EngineeringOffshore wind powerWind powerVDP::Teknologi: 500::Miljøteknologi: 610Renewable Energy Sustainability and the Environmentbusiness.industry020209 energy0202 electrical engineering electronic engineering information engineering02 engineering and technologybusinessTurbineMarine engineering
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Linear parameter‐varying modelling and control of an offshore wind turbine with constrained information

2014

This study deals with linear parameter-varying modelling and output-feedback H ∞ control design for an offshore wind turbine. The controller is designed with consideration that not all the information in the feedback loop will be used. This constraint is incorporated into the design procedure. Constrained information means that a special zero-non-zero pattern is forced upon the gain matrix. The constrained controller is obtained based on parameter-dependent Lyapunov functions and formulated in terms of linear-matrix inequalities. Since the functions are dependent on the wind speed and accurate wind speed measurements are rarely available in practice, an extended Kalman filter is used to est…

EngineeringOperating pointControl and OptimizationWind powerbusiness.industryBlade pitchOpen-loop controllerDrivetrainComputer Science Applications1707 Computer Vision and Pattern RecognitionControl engineeringControl and Systems Engineering; Human-Computer Interaction; Computer Science Applications1707 Computer Vision and Pattern Recognition; Control and Optimization; Electrical and Electronic EngineeringWind speedComputer Science ApplicationsHuman-Computer InteractionOffshore wind powerControl and Systems EngineeringControl theoryElectrical and Electronic EngineeringbusinessLPV modeling constrained information H1 control wind turbine.IET Control Theory & Applications
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Offshore Wind Payload Transfer Using Flexible Mobile Crane

2015

This article presents an offshore-simulated loading and unloading of a payload from a floating platform to a fixed structure. The experiments are performed in a dry-lab, where a Stewart platform is used to simulate the motion of the vessel. A hydraulically actuated vehicle loader crane is used to perform the tasks of payload transfer. The crane includes a hydraulic winch where the wire force is measured by a load cell. A mathematical model of the winch is derived and is experimentally verified. The control strategies include a heave compensation and a constant tension mode. A motion reference unit is used to generate the reference motion of the moving platform. Experimental results show the…

EngineeringPayloadbusiness.industryConstant TensionHeave Compensationlcsh:QA75.5-76.95Computer Science ApplicationsOffshore wind powerControl and Systems EngineeringModeling and SimulationTransfer (computing)Marine Operationlcsh:Electronic computers. Computer scienceMobile cranebusinessHydraulic WinchSoftwareMarine engineeringModeling, Identification and Control: A Norwegian Research Bulletin
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Foundations of offshore wind turbines: A review

2019

Abstract Offshore wind is a source of clean, renewable energy of great potential value to the power industry in the context of a low carbon society. Rapid development of offshore wind energy depends on a good understanding of technical issues related to offshore wind turbines, which is spurring ongoing research and development programmes. Foundations of offshore wind turbines present one of the main challenges in offshore wind turbine design. This paper reviews the present state of knowledge concerning geotechnical and structural issues affecting foundation types under consideration for the support structures of offshore wind turbines, and provides recommendations for future research and de…

EngineeringRenewable Energy Sustainability and the Environmentbusiness.industry020209 energyComputingMethodologies_MISCELLANEOUSFoundation (engineering)Context (language use)02 engineering and technologyTurbineCivil engineeringRenewable energyOffshore wind power0202 electrical engineering electronic engineering information engineeringComputingMethodologies_DOCUMENTANDTEXTPROCESSINGElectric power industrybusinessVDP::Teknologi: 500::Marin teknologi: 580::Offshoreteknologi: 581
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Semiactive control for floating offshore wind turbines subject to aero-hydro dynamic loads

2011

Wind and wave dynamic loads might cause undesirable vibrations that affect the structure integrity and system performance of floating offshore wind turbines. This paper addresses the problem of dynamic load mitigation by using semiactive control techniques with the tuned liquid column dampers placed on the turbine’s tower. The control law is formulated based on the mixed H2/H∞ methods for ensuring the system stability and reliability. Furthermore, the proposed controller only uses output feedback so as to avoid the dependence on the knowledge of the states of the system. Peer Reviewed

EngineeringRenewable Energy Sustainability and the Environmentbusiness.industryEnergy Engineering and Power TechnologyTurbineFloating wind turbinesDynamic load testingDamperVibrationOffshore wind powerReliability (semiconductor)Control theory:Energies::Recursos energètics renovables [Àrees temàtiques de la UPC]Electrical and Electronic EngineeringbusinessTowerOffshore wind energyEnergies renovables -- Producció
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A novel current-based approach for very low variation detection of resistive sensors in wheatstone bridge configuration

2014

EngineeringResistive sensorsWheatstone bridgelaw.inventionlawElectronic engineeringCurrent conveyorHigh resolutionElectrical and Electronic EngineeringLinear responseHigh sensitivityWheatstone bridgeHigh accuracybusiness.industryOffset compensationElectrical engineeringAD844; Bridge balancing; Current conveyor; Current-mode circuit; High accuracy; High resolution; High sensitivity; Linear response; Offset compensation; Resistive sensor detection; Small resistive variation; Wheatstone bridge; Electrical and Electronic EngineeringSmall resistive variationAD844Variation (linguistics)Current-mode circuitKelvin bridgeResistive sensor detectionCurrent (fluid)businessBridge balancing
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