Room:
Egbert-von-Hoyer Hall
Topic:
E. Design and systems engineering
Form of presentation:
Oral
Duration:
90 Minutes
Chaired by: K. Dykes, T. Chaviaropoulos
11:30
Wind Farm Turbine Type and Placement Optimization
Pierre-Elouan Réthoré | National Renewable Energy Laboratory | United States
Show details
Authors:
Pierre-Elouan Réthoré | National Renewable Energy Laboratory | United States
Katherine Dykes | United States
George Scott | United States
Jason Fields | United States
Monte Lunacek | United States
Julian Quick | United States
Peter Graf | United States
The layout of turbines in a wind farm is already a challenging nonlinear, non-convex, nonlinearly constrained continuous global optimization problem. Here we begin to address the next generation of wind farm optimization problems by adding the complexity that there is more than one turbine type to choose from. The optimization becomes a nonlinear constrained mixed integer problem, which is a very difficult class of problems to solve. This document briefly summarizes the hybrid genetic algorithm we have developed, the code validation steps we have performed, and the initial results for multi-turbine type and placement optimization (TTP_OPT) we have run.
11:50
On the impact of multi-axial stress states on trailing edge bondlines in wind turbine rotor blades
Pablo Noever Castelos | Leibniz Universität Hannover | Germany
Show details
Authors:
Pablo Noever Castelos | Leibniz Universität Hannover | Germany
Claudio Balzani | Germany
For a reliable design of wind turbine blades all of their components have to be designed to withstand the loads appearing in the blade's lifetime. A bondline failure can lead to the loss of a rotor blade and is extraordinarily relevant to be treated with strong emphasis when designing a wind turbine. Large blade deflections result in high strains in the adhesive connections, especially at the trailing edge. The latest edition of the DNV GL demands a three-dimensional stress analysis of bondlines, whereas before an isolated shear stress proof was sufficient. This presentation shows the influence of multi-axial stress states on the ultimate and fatigue load resistance of trailing edge adhesive bonds. The findings highlight the importance to include a three-dimensional stress state in the failure analysis of adhesive bonds in modern wind turbine rotor blades, and the necessity to perform a three-dimensional characterization of adhesive materials.