SIMPACK应用分析

null The AeroDyn – SIMPACK Interface The AeroDyn – SIMPACK Interface AeroDyn Overhaul Kick-off Meeting Feb 13th and 14th Boulder, CO ContentsContentsWhat is SIMPACK? Motivation Project Status The Actual SIMPACK / AeroDyn Interface “SIM2AD” Structural Models of Rotor Blades Improvements of SIM2AD and/or AeroDyn Example of a Coupled Model Conclusion SIMPACK – What is it?SIMPACK – What is it?SIMPACK is a general multi-body simulation code Simulation of structural Dynamics of general systems Integration of flexible bodies is possible Freedom in modeling: Modeling of entire system models completely in SIMPACK modular coupling to external Code Co-Simulation, Code Export, Code Import, Pre- und Post-Processor, controlling elements, etc. Motivation MotivationState-of-the-Art Wind Turbine Simulation 2 - Step Approach1. Step: Analysis of entire system Calculation of loads at interconnection points2. Step: Component analysis High level of detail Quasi-static / partly dynamic Loadcases are derived from 1. step calculationsProblem: Coupling effects are NOT consideredSIMPACK WindExample: Model with 28 modal degrees of freedom[Fig. Vestas] RNKF, T16, 1718, 1920-2324-27281234567, 89, 101112131415flexible beamWind [Fig. Renk Aerogear, Renk AG ] Project StatusProject StatusDrive train modelsDetailed gearwheelRotor aerodynamics - WindWind fieldsControl systemEl. power PratedPitch Angle [o]Wind speedVeinVnennVausRot. speed 90oTower modelBlade modelSIMPACK / AeroDyn Interface “SIM2AD”SIMPACK / AeroDyn Interface “SIM2AD”Sim2AD SIMPACK “User Force” controlling of AeroDyn calculation disposes forces at markersSIMPACK model... Hub...i:j Blatt : Elem i : Ni : 1SIMPACK time integrationSim2ADMod transfer of variablesUser interface user specification: - number of blades - number of elements - important markersSim2ADSub by AeroDyn & Sim2AD called subroutinesAeroDyn output file airfoil fileAeroDyn inputwind file AeroDyn aerodynamic calculationkineticskinematicsAeroDyn InterfaceSIMPACKThe SIM2AD GUIThe SIM2AD GUIOne force element for all blade elements Force element: Determination of model kinematics Assembling of aerodynamic forces Input in GUI: Number of blades Number of elements Important markers Model RequirementsModel RequirementsAt least 4 different bodies: Tower Nacelle Low speed shaft Rotor blades These bodies must offer the important markers: (analogue to ADAMS2AD) Ground marker Tower marker Yaw bearing marker Nacelle marker Low speed shaft marker (one for each blade) Pitch reference marker (one for each blade) Aerodynamic marker (one for each blade element) Aerodynamic MarkerAerodynamic Markerdefine the point of application of the aerodynamic forces. One marker is required for each blade element Position: blade elements aligned with chord line Orientation: x-axis: along the span of the blade y-axis: nominally upwind z-axis: towards leading edge >>Aerodynamic Markers have to be defined in position and orientation at the blade model!Structural Blade ModelsStructural Blade ModelsSuper-element-approach Stiff bodies Component flexibility modeled by flexible joints Blades and tower are modeled flexible in bending and torsion Modal reduced FE beam elements Flexible body Possibility to model stiffness for bending, torsion, and tension Modal reduced general FE model Flexible body Considering the complete stiffness matrices In which way are the markers attached to the blade models???1. Super-element-approach1. Super-element-approachAerodynamic Marker: located on rigid body Location and orientation are free to use Dynamical behavior is represented well with only three super elements BUT: information about blade deformation is not sufficient for aerodynamics with low number of super-elements 2. Modal reduced FE beam elements2. Modal reduced FE beam elementsModeled in SIMPACK Module SIMBEAM One Marker must be defined at the elastic axis between two flexible elements More markers are not allowed! Aerodynamic Forces: 2 Possibilities Cubic interpolation can be realized in the interface Dummy bodies can be used that contain the aerodynamic markers (realized at present) 3. Modal reduced general FE model3. Modal reduced general FE modelModel can be created in general FE codes like ANSYS, ABAQUS, etc. Modal reduction in the SIMPACK Module FEMBS FE Nodes can be chosen for marker positions. Nodes have to be located at the aerodynamic marker positions in FE code >> not very usefulDisadvantages of the Actual InterfaceDisadvantages of the Actual InterfaceDisadvantages occur for all structural blade models More flexibility between markers and Aerodynamic reference points is required. Possibility: Discretisation of aerodynamical elements should be independent of structural discretisationDiscretisation of aerodynamics and structural dynamicsDiscretisation of aerodynamics and structural dynamicsAerodynamic reference points are static input for AeroDyn Deviation caused by blade rotation or turbine deformation is given by the MBS – model Aerodynamic 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 itself Marker in SIMPACKAerodynamic ref pointExample: Time Integration of the Coupled ModelExample: Time Integration of the Coupled ModelConclusionConclusion AeroDyn can be used in conjunction with SIMPACK Different structural models for elastic rotor blades can be used with AeroDyn A redesign of the coupling may be useful to reduce modeling effort >> Aerodynamic discretisation should be independent from structural discretisationnullMore information: www.simpack.com www.windenergie.eu