SIMPACK Academy Topics

Part 1: Fundamentals and System Design of Wind Turbines

Wind turbines are the largest rotating structures on earth. Operation in the turbulent
atmospheric boundary layer and random seas involves various dynamic problems and attracts both high fatigue and ultimate loads.

The cost-efficient and reliable design depends on tailoring of system dynamics including aero-elastic, mechanical, electrical, civil and control engineering.

The course combines theoretical background with recent industrial experience to provide a comprehensive introduction to the state of the art of wind turbine dynamics and design from a system´s viewpoint.

• Wind characteristics and spatial and temporal modelling of 3D wind field for fatigue and extreme event analysis
• Rotor aerodynamics, blade element momentum theory and CFD methods, rotor blade design
• Basic concepts of wind turbines, design of mechanical, electrical and control system, esp. of variable-pitch, variable-speed type
• Dynamic problems and aero-elastic simulation, methods and tools, experimental validation
• Product development process incl. certification, wind turbine design standards and dimensioning load cases, fatigue and ultimate limit state analysis of tower, hub and blade
• Dynamics and design of offshore wind turbines (optional)

Part 2: Design and Analysis of Drive Trains in Wind Turbine and other large Industrial Applications

The possible conjunction of drive train and structural natural frequencies can be seen as general problem regarding the design and dimensioning of large drive trains. Especially in the field of wind turbines this fact is obvious, due to the complex elastic grounded system which is working under turbulent stochastic input (wind speed). The same tendencies can also be found in other fields of application. This leads to the conclusion that it is absolutely necessary to have an exact knowledge of the dynamic drive
train and the surrounding structure behaviour already in the design phase.

The course gives an overview to the dimensioning and design of drive train systems and their components. Furthermore the advantages as well as the accuracy of the multi-bodysystem method will be shown.

• Dimensioning of shafts according to DIN 743 and methods of modelling shafts in multi-body-system models.
• Design and calculation of gears by the usage of DIN 3990 and possibilities of modelling the tooth contact in multi-body-system models
• Basic to the selection of bearings and description of several methods to model bearings in multi-bodysystem models
• Consideration of FEM structures for shafts, gear housing and surrounding structures in MBS models
• Analysis of the drive trains in the frequency domain under usage of mode representation, Campbelland waterfall diagram
• Calculation of load cases by means of the co-simulation with Matlab/Simulink, modelling of the rotorand generator sided excitations

Download: SIMPACK_Wind_Academy_2009.pdf

Compact and reduced representations of finite element models are essential for the efficient analysis of multibody system which include flexible bodies as well as for stress calculation based on loads, which were calculated by multibody system analyses. The theoretical background and software implementation of the following topics will be discussed:

• Reduction of linear finite element models for MBS applications
• Monitoring of reduced finite element models (comparison with the non-reduced FEM model)
• Integration of reduced finite element models into multibody systems
• Requirements for stress and strength calculations based on reduced finite element models

These will be accompanied by practical examples, showing in detail:

• Mode calculation
• Selection of boundary conditions
• Mode selection
• Durability calculation