Abstract
Composite materials are increasingly used in wind blade because of their superior mechanical properties such as high strength-to-weight and stiffness-to-weight ratio. This paper presents vibration and damping analysis of fiberreinforced composite wind turbine blade with viscoelastic damping treatment. The finite element method based on full layerwise displacement theory was employed to analyze the damping, natural frequency, and modal loss factor of composite shell structure. The lamination angle was considered in mathematical modeling. The curved geometry, transverse shear, and normal strains were exactly considered in present layerwise shell model, which can depict the zig-zag in-plane and out-of-plane displacements. The frequency response functions of curved composite shell structure and wind blade were calculated. The results show that the damping ratio of viscoelastic layer is found to be very sensitive to determination of magnitude of composite structures. The frequency response functions with variety of thickness of damping layer were investigated. Moreover, the natural frequency, modal loss factor, and mode shapes of composite fiber reinforced wind blade with viscoelastic damping control were calculated.
Highlights
Fiber reinforced composites are widely used in advanced structural applications such as aerospace and wind blade because of high strength-to-weight and stiffness-to-weight ratio
The frequency response functions of curved composite shell structure and wind blade were calculated for investigation of damping and modal properties of structures
To carry out a finite element analysis of cylindrical composite shell, the nine-node 9 × 9 meshes were used for the composite cylindrical shell structure
Summary
Fiber reinforced composites are widely used in advanced structural applications such as aerospace and wind blade because of high strength-to-weight and stiffness-to-weight ratio. Numerical analysis of sandwiched shell structures has been studied by many researchers with different theories and methods [1,2,3,4,5]. Damping is an important factor for the dynamic design as it influences the vibration and noise levels significantly. Due to its high level of energy dissipation, the viscoelastic layer is provided to play a damping role and improves the dynamic response of the structure [13]. Investigation of the vibration and damping characteristics of composite wind blade is very important. The vibration and damping characteristics of composite fiber reinforced wind blade with viscoelastic damping control were studied using finite element method. The frequency response functions of curved composite shell structure and wind blade were calculated for investigation of damping and modal properties of structures
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