TY - RPRT

T1 - Anisotropic beam model for analysis and design of passive controlled wind turbine blades

A1 - Branner,Kim

A1 - Blasques,José Pedro Albergaria Amaral

A1 - Kim,Taeseong

A1 - Fedorov,Vladimir

A1 - Berring,Peter

A1 - Bitsche,Robert

A1 - Berggreen,Christian

AU - Branner,Kim

AU - Blasques,José Pedro Albergaria Amaral

AU - Kim,Taeseong

AU - Fedorov,Vladimir

AU - Berring,Peter

AU - Bitsche,Robert

AU - Berggreen,Christian

PB - DTU Wind Energy

PY - 2012

Y1 - 2012

N2 - The main objective of the project was, through theoretical and <br/>experimental research, to develop and validate a fully coupled, <br/>general beam element that can be used for advanced and rapid <br/>analysis of wind turbine blades. This is fully achieved in the project <br/>and the beam element has even been implemented in the aeroelastic <br/>code HAWC2. It has also been demonstrated through a parametric <br/>study in the project that a promising possibility with the tool is to <br/>reduce fatigue loads through structural couplings. More work is <br/>needed before these possibilities are fully explored and blades with <br/>structural couplings can be put into production. <br/>A cross section analysis tool BECAS (BEam Cross section Analysis <br/>Software) has been developed and validated in the project. BECAS <br/>is able to predict all geometrical and material induced couplings. <br/>This tool has obtained great interest from both industry and <br/>academia. <br/>The developed fully coupled beam element and cross section <br/>analysis tool has been validated against both numerical calculations <br/>and experimental measurements. Numerical validation has been <br/>performed against beam type calculations including Variational <br/>Asymptotical Beam Section Analysis (VABS) and detailed shell <br/>and solid finite element analyses. Experimental validation included <br/>specially designed beams with built-in couplings, a full-scale blade <br/>section originally without couplings, which subsequently was <br/>modified with extra composite layers in order to obtain measurable <br/>couplings. Both static testing and dynamic modal analysis tests <br/>have been performed. <br/>The results from the project now make it possible to use structural <br/>couplings in an intelligent manner for the design of future wind <br/>turbine blades. The developed beam element is especially developed for wind turbine blades and can be used for modeling <br/>blades with initial curvature (pre-bending), initial twist and taper. <br/>Finally, it have been studied what size of structural couplings can <br/>be obtained in current and future blade designs.

AB - The main objective of the project was, through theoretical and <br/>experimental research, to develop and validate a fully coupled, <br/>general beam element that can be used for advanced and rapid <br/>analysis of wind turbine blades. This is fully achieved in the project <br/>and the beam element has even been implemented in the aeroelastic <br/>code HAWC2. It has also been demonstrated through a parametric <br/>study in the project that a promising possibility with the tool is to <br/>reduce fatigue loads through structural couplings. More work is <br/>needed before these possibilities are fully explored and blades with <br/>structural couplings can be put into production. <br/>A cross section analysis tool BECAS (BEam Cross section Analysis <br/>Software) has been developed and validated in the project. BECAS <br/>is able to predict all geometrical and material induced couplings. <br/>This tool has obtained great interest from both industry and <br/>academia. <br/>The developed fully coupled beam element and cross section <br/>analysis tool has been validated against both numerical calculations <br/>and experimental measurements. Numerical validation has been <br/>performed against beam type calculations including Variational <br/>Asymptotical Beam Section Analysis (VABS) and detailed shell <br/>and solid finite element analyses. Experimental validation included <br/>specially designed beams with built-in couplings, a full-scale blade <br/>section originally without couplings, which subsequently was <br/>modified with extra composite layers in order to obtain measurable <br/>couplings. Both static testing and dynamic modal analysis tests <br/>have been performed. <br/>The results from the project now make it possible to use structural <br/>couplings in an intelligent manner for the design of future wind <br/>turbine blades. The developed beam element is especially developed for wind turbine blades and can be used for modeling <br/>blades with initial curvature (pre-bending), initial twist and taper. <br/>Finally, it have been studied what size of structural couplings can <br/>be obtained in current and future blade designs.

KW - DTU-Wind-Energy-E-0001(EN)

KW - DTU-Wind-Energy-Report-E-0005

BT - Anisotropic beam model for analysis and design of passive controlled wind turbine blades

T3 - DTU Wind Energy E

T3 - en_GB

ER -