Rüzgar türbini göbeğinin yapısal tasarımı ve optimizasyonu

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Thesis Type: Postgraduate

Institution Of The Thesis: Kocaeli University, Fen Bilimleri Enstitüsü, Makina Mühendisliği Bölümü, Turkey

Approval Date: 2011

Thesis Language: Turkish

Student: SERKAN DEMİRCİ

Supervisor: Murat Makaraci

Open Archive Collection: AVESIS Open Access Collection

Abstract:

In this study, optimum structural design of a 3 bladed Horizontal Axis Wind Turbine (HAWT), rated 500 kW, has been aimed. For the HAWT, shape, dimension, material and force investigation has been made and dimensions have been designed as parametric functions of the turbine power. Then, two different hub geometries have been chosen named as plate and spherical hub. The forces acting on the hub have been calculated and verified with literature values. Since the loads are cyclic, the structural design has been made against fatigue failure. Finite element fatigue analysis has been realized with solid models of plate and spherical hubs by using ANSYS Workbench software. Later, hub diameter and thickness have been chosen as independent variables and the relations of hub mass, minimum equivalent stress, safety factor and life with the variables have been obtained by Design of Experiments (DOE) in Design Xplorer software. With realization of life condition, Goal Driven Optimization module in Design Xplorer software has been used to obtain the minimum hub mass for 3 different safety factor for each hub form. Based on these findings, the spherical hub has been chosen for the 500 kW HAWT because of its minimum weight and thus, optimal hub diameter and thickness values have been determined. Finally, by taking blade connection ring thickness factor, blend radius ratio and ring height ratio percentage as design variables, static and fatigue analyses, DOE and GDO optimizations have been renewed. As a result, an important amount of weight reduction has been achieved.