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1、The AeroDyn SIMPACK Interface,AeroDyn Overhaul Kick-off Meeting Feb 13th and 14th Boulder, CO,Contents,What 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 Conclus
2、ion,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 Ex
3、port, Code Import, Pre- und Post-Processor, controlling elements, etc.,Motivation,State-of-the-Art Wind Turbine Simulation 2 - Step Approach,1. Step: Analysis of entire system Calculation of loads at interconnection points,2. Step: Component analysis High level of detail Quasi-static / partly dynami
4、c Loadcases are derived from 1. step calculations,Problem: Coupling effects are NOT considered,SIMPACK Wind,Example: Model with 28 modal degrees of freedom,Fig. Vestas,R,N,K,F, T,16, 17,18, 19,20-23,24-27,28,1,2,3,4,5,6,7, 8,9, 10,11,12,13,14,15,flexible beam,Wind,Fig. Renk Aerogear, Renk AG ,Projec
5、t Status,Drive train models,Detailed gearwheel,Rotor aerodynamics,- Wind,Wind fields,Control system,El. power,Prated,Pitch Angle o,Wind speed,Vein,Vnenn,Vaus,Rot. speed,90o,Tower model,Blade model,SIMPACK / AeroDyn Interface “SIM2AD”,Sim2AD SIMPACK “User Force” controlling of AeroDyn calculation dis
6、poses forces at markers,SIMPACK model,.,Hub,.,i:j,Blatt : Elem i : N,i : 1,SIMPACK time integration,Sim2ADMod transfer of variables,User interface user specification: - number of blades - number of elements - important markers,Sim2ADSub by AeroDyn & Sim2AD called subroutines,AeroDyn output file,airf
7、oil file,AeroDyn input,wind file,AeroDyn aerodynamic calculation,kinetics,kinematics,AeroDyn,Interface,SIMPACK,The SIM2AD GUI,One 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 I
8、mportant markers,Model Requirements,At 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 m
9、arker (one for each blade) Aerodynamic marker (one for each blade element),Aerodynamic Marker,define 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-a
10、xis: nominally upwind z-axis: towards leading edge Aerodynamic Markers have to be defined in position and orientation at the blade model!,Structural Blade Models,Super-element-approach Stiff bodies Component flexibility modeled by flexible joints Blades and tower are modeled flexible in bending and
11、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-approach,Aerodyna
12、mic 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 elements,Modeled in
13、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 presen
14、t),3. Modal reduced general FE model,Model 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 useful,Disadvantages of the
15、 Actual Interface,Disadvantages 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 discretisation,Discretisation of aerodynamics and structural
16、dynamics,Aerodynamic 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 interf
17、ace SIM2AD or AeroDyn itself,Marker in SIMPACK,Aerodynamic ref point,Example: Time Integration of the Coupled Model,Conclusion,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 discretisation,More information: www.windenergie.eu,
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