Finite Element Modelling of Wind Turbine Blade In a series of research projects at Chalmers within the Swedish Wind Power Technology Centre (SWPTC) [1–6], Finite Element models of an international benchmark wind turbine blade [7] have been studied, see figure 1. A recent collaborative effort between Chalmers University of Technology and DIAB AB (situated in Laholm, Sweden) has focused on modelling of failure mechanisms thought to occur in wind turbine blades. Fig. 1: Top: Shell element version of Finite Element Model of the NREL 5MW wind turbine blade, developed at Chalmers and CCG Composites to mimick the mechanical properties of the Jonkman report [7]. bottom, left: Results from geometrically nonlinear FE-analysis of test specimen. bottom,right: Postmortem analysis of tested specimen. In a recent study, the predictive quality of geometrically nonlinear FE models with anisotropic linear ma- terial models to predict failure mechanisms and failure loads of curved sandwich beams subjected to end loading was investigated experimentally [6]. It is believed that the results could be improved by using more advanced material modelling, as the core material is porous and will exhibit highly nonlinear behavior when compacted. Thus, the topic of this study is to investigate and implement advanced material models and compare the results to existing test data. Further testing may also be of interest. The project has been initiated in collaboration by Wind Turbine researchers at Chalmers and the company DIAB and will be supported by technical experts from ANSYS, a leading FE software developer. • Supervisor: Professor Ragnar Larsson, Chalmers, [email protected] • Industry Advisor: Carl-Johan Lindholm, DIAB, [email protected] • 2 nd Industry Advisor: Jonas Norlin, ANSYS, [email protected]
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Finite Element Modelling of Wind Turbine BladeIn a series of research projects at Chalmers within the Swedish Wind Power Technology Centre (SWPTC)[1–6], Finite Element models of an international benchmark wind turbine blade [7] have been studied, seefigure 1. A recent collaborative effort between Chalmers University of Technology and DIAB AB (situatedin Laholm, Sweden) has focused on modelling of failure mechanisms thought to occur in wind turbine blades.
Fig. 1: Top: Shell element version of Finite Element Model of the NREL 5MW wind turbine blade, developedat Chalmers and CCG Composites to mimick the mechanical properties of the Jonkman report [7].bottom, left: Results from geometrically nonlinear FE-analysis of test specimen. bottom,right:Postmortem analysis of tested specimen.
In a recent study, the predictive quality of geometrically nonlinear FE models with anisotropic linear ma-terial models to predict failure mechanisms and failure loads of curved sandwich beams subjected to endloading was investigated experimentally [6]. It is believed that the results could be improved by using moreadvanced material modelling, as the core material is porous and will exhibit highly nonlinear behavior whencompacted. Thus, the topic of this study is to investigate and implement advanced material models andcompare the results to existing test data. Further testing may also be of interest. The project has beeninitiated in collaboration by Wind Turbine researchers at Chalmers and the company DIAB and will besupported by technical experts from ANSYS, a leading FE software developer.
• Supervisor: Professor Ragnar Larsson, Chalmers, [email protected]
• Industry Advisor: Carl-Johan Lindholm, DIAB, [email protected]
• 2nd Industry Advisor: Jonas Norlin, ANSYS, [email protected]
References
[1] Norlin, J. and Jarpner, C., Fluid Structure Interaction on Wind Turbine Blades, MSc thesis 2012:24,Chalmers (2012)
[2] Khorsand, M., Johansson, A., Abrahamsson, T., Development of simplified models for wind turbineblades with application to NREL 5MW offshore research wind turbine, in Proceedings of IMACXXXI, AConference on Structural Dynamics, 2014
[3] Fransen, I. et al, FE modelling of wind turbine blade, Project report from course TME130: Group 4,Chalmers (2014)
[4] Echaniz, I. et al, FE modelling and testing of sandwich composites, Project report from course TME130:Group 5, Chalmers (2014)
[5] Ask, S. et al, Finite Element Modelling of Wind Turbine Blade, Project report from course TME131:Group 1, Chalmers (2015)
[6] Lindholm, C-J., Johansson, A. T., Experimental Analysis of Stresses in Sandwich Structures due to theBrazier Effect, in Proceedings of ICCM20, International Conference on Composite Mechanics, Copen-hagen, 2015
[7] Jonkman, J. et al, Definition of a 5MW reference wind turbine for offshore system development, technicalreport, National Renewable Energy Laboratory, (2010)
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