الفهرس 
INTRODUCTIONيوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
Renewable energy technology is considered as one of the most promising technologies in the world. This is due to that non-renewable energy resources are on its way to vanish. As the world communities hurry up to find alternative effective,
clean, and reliable resources, wind energy is noticed to be the most rapidly growing technology. The cornerstone of this technology is the wind turbine. The wind turbine
performance can be optimized using composite material blades. Using composite material blades introduces high stiffness and strength-to-weight ratio which in turn leads to avoid wear and corrosion issues and increase its operating life.
An integrated scene of the wind turbine performance can be drawn in terms of its aerodynamic and dynamic characteristics. Dynamic performance characteristics ensure that a wind turbine can survive a specific dynamic environment with prescribed aerodynamic performance characteristics. In this context, the scope of this thesis is to highlight the significant role of the dynamic approach on strengthening the accuracy, reliability, durability, and integrity of modern Vertical Axis Wind Turbines (VAWTs) performance. This study seeks to model and optimize the wind turbine performance in terms of its design parameters and composite material blades characteristics. Furthermore, the present study aims to
establish an integrated working strategy in conducting, analyzing, and interpreting its research findings.
In order to achieve this intended goal, an integrated research methodology is accomplished. Based on wind turbine design parameters, various vertical axis wind turbines are designed. In order to improve the scalability and accuracy of the
developed models, modified mechanical parameters are introduced. The lamination plate theory is used to compute the equivalent mechanical properties for each composite blade configuration. The Finite Element Analyses (FEA) are conducted to investigate the dynamic characteristics (natural frequencies and its associated mode shapes) of wind turbine models. Numerical analyses are performed within the
SolidWorks Simulation 2020 package. Some modeling and optimization techniques as Taguchi technique and Response Surface Methodology (RSM) are employed to model and optimize the dynamic performance of wind turbine composite blades and investigates the effects of composite blade characteristics in addition to some design parameters on the whole wind turbine performance. The Analysis of Variance (ANOVA) and other tools of Taguchi technique have been used to analyze, obtain the significant design parameters, and evaluate the optimum combination levels of wind turbine design parameters. Mathematical modeling of wind rotor performance
has been established based on RSM.
Moreover, this study seeks to enhance investigation of numerical and
experimental results through using suitable experimental prototypes of various vertical axis wind turbine composite blades. Each composite blade was fabricated of glass fiber-polyester matrix composites and was sized according to the prespecified dimensions in the design stage. The dynamic characteristics such as natural frequencies, mode shapes, and modal damping ratios were extensively
investigated using the Fast Fourier Transformer (FFT) analyzer.
The numerical and experimental results show that 1. The role of composite material blades in improving the dynamic performance of a wind turbine is significant.
2. The maximum value of natural frequency is achieved under
[0°/90°/0°/90°/0°/90°] composite blade configuration and is attributed to the
high level of stiffness at this condition.
3. The high damping values at [R6] stacking sequence layout is related to the small level of stiffness and high energy dissipation.
4. With the proper choice of stacking sequence, fiber and matrix materials for the composite blades, high values of system damping factor for various modes of composite blades may be obtained.
5. The suggested finite element models of the composite blades provide an
efficient tool for the dynamic analysis with proper accuracy.
6. The Taguchi method with the additive model combined with the Response Surface Methodology (RSM) is a very efficient and practical tool for modelling and optimizing VAWT designs with various input parameters.