Improved fatigue design methods for offshore wind turbine rotor blades considering non-linear Goodman analysis combined with finite element analysis Stefan.

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Presentation transcript:

Improved fatigue design methods for offshore wind turbine rotor blades considering non-linear Goodman analysis combined with finite element analysis Stefan Wessels Michael Strobel Dr. Arno van Wingerde Isabel Koprek Dr. Hans-Gerd Busmann

Outline Idea & Motivation Used Fundamentals Structural Model Programming the fatigue Analysis based on NLGD´s Validation Fatigue Analysis on a rotor blade model Conclusion & Outlook

Idea & Motivation Square – Cube – Law leads to increasing blade weights Conservative approaches in blade design Material properties of fiber composites can be exploited further Goal: Weight & Cost reduction in the early design stage Track: Damage calculation using FEM and Non-Linear-Goodman-Analysis http://www.enercon.de

Used Fundamentals Non-Linear-Goodman-Diagram (NLGD) Rain-Flow-Counting Miner-Sum

Structural Model FEM-Rotor-Blade-Model Model generated with FOCUS ANSYS-Solver 8-noded SHELL99-Elements 4-noded SHELL181-Elements Loads applied on arbitrary cross section CARDS (JAVA - Open-Source Postprocessor)

Programming the fatigue Analysis based on NLGD´s Principal procedure

Programming the fatigue Analysis based on NLGD´s Programming the NLGD Transforming S-N-curve data Determination of maximum number of cycles out of NLGD Using method to find a point in a triangle Logarithmic interpolation φ

Validation Results are compared with FOCUS FOCUS  beam model Improved method  3D FEM-Model Four points on an arbitrary cross section are investigated Comparison of damage for UD-Laminate and +/- 45°-Laminate Three different approaches

Validation Big deviations Comparison of the results Comparison of strain-time-series  Factor k to adjust the damage calculation

Fatigue Analysis on a rotor blade model Transition zone of webs of particular interest Analysis of: UD-Laminate in spar caps +/-45°-Laminate for outer shell Adhesive bonding

Fatigue Analysis on a rotor blade model Results of the damage calculation Damage of adhesive bonding Damage of +/-45°-Lamiante Damage of UD-Lamiante in the spar caps Increasing damage towards the tip due to: Deceasing thickness and cross section area Constant load on the blade section Change from two to one web

Conclusion & Outlook The Improved fatigue design method helps: Enhancing the material usage Detecting critical areas in terms of fatigue Increases the accuracy of the material prediction (using NLGD´s) Issues to improve Check other approaches for damage accumulation The way of applying loads on 3D-FEM-Models

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