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1、应用分析应用分析 Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado2 ContentsWhat is SIMPACK?MotivationProject StatusThe Actual SIMPACK/AeroDyn Interface“SIM2AD”Structural Models of Rotor Blades Improvements of SIM2AD and/or AeroDynExample of a Coupled ModelConclu
2、sion Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado3 Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado4 Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado5 Univers
3、itt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado6 Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado7 Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado8 Universitt Stuttgar
4、t AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado9 Aerodynamic Markerdefine the point of application of the aerodynamic forces.One marker is required for each blade element Position:blade elements aligned with chord lineOrientation:x-axis:along the span of the bladey-axis:n
5、ominally upwind z-axis:towards leading edge Aerodynamic Markers have to be defined inposition and orientation at the blade model!Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado10 Structural Blade Models1.Super-element-approachStiff bodiesComponent flexi
6、bility modeled by flexible joints Blades and tower are modeled flexible in bending and torsion2.Modal reduced FE beam elementsFlexible bodyPossibility to model stiffness for bending,torsion,and tension3.Modal reduced general FE modelFlexible bodyConsidering the complete stiffness matricesIn which wa
7、y are the markers attached to the blade models?Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado11 1.Super-element-approach12vm1m2m3m4Aerodynamic Marker:located on rigid bodyLocation and orientation are free to useDynamical behavior is represented well wi
8、th only three super elementsBUT:information about blade deformation is not sufficient for aerodynamics with low number of super-elements Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado12 2.Modal reduced FE beam elementsModeled in SIMPACK Module SIMBEAMO
9、ne Marker must be defined at the elastic axis between two flexible elementsMore markers are not allowed!Aerodynamic Forces:2 Possibilities1.Cubic interpolation can be realized in the interface2.Dummy bodies can be used that contain the aerodynamic markers(realized at present)Universitt Stuttgart Aer
10、oDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado13 3.Modal reduced general FE modelModel can be created in general FE codes like ANSYS,ABAQUS,etc.Modal reduction in the SIMPACK Module FEMBSFE Nodes can be chosen for marker positions.Nodes have to be located at the aerodynamic m
11、arker positions in FE code not very useful Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado14 Disadvantages of the Actual InterfaceDisadvantages occur for all structural blade modelsMore flexibility between markers and Aerodynamic reference points is req
12、uired.Possibility:Discretisation of aerodynamical elements should be independent of structural discretisation Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado15 Discretisation of aerodynamics and structural dynamicsAerodynamic reference points are static
13、 input for AeroDynDeviation caused by blade rotation or turbine deformation is given by the MBS modelAerodynamic reference points and markers in the mbs code do not need to be identical when using cubic interpolation Implementation possible in interface SIM2AD or AeroDyn itselfMarker in SIMPACKAerod
14、ynamic ref point Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado16 Example:Time Integration of theCoupled Model Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado17 ConclusionAeroDyn can be used in conjunction
15、 with SIMPACKDifferent structural models for elastic rotor blades can be used with AeroDynA redesign of the coupling may be useful to reduce modeling effort Aerodynamic discretisation should be independent from structural discretisation Universitt Stuttgart AeroDyn Overhaul Kick-off Meeting 2008,Feb 13th and 14th Boulder,Colorado18 More information:www.windenergie.eu