Investigation of the Effect of Geodesic and Semi-geodesic Winding on the Vibration Characteristics of Variable Stiffness Filament Wound Shells of Revolution

2012 ◽  
Author(s):  
Altan Kayran ◽  
Erdem Yavuzbalkan ◽  
Serkan Ibrahimoglu
Keyword(s):  
Variable Stiffness ◽  
Vibration Characteristics ◽  
Shells Of Revolution ◽  
Filament Wound

Free Vibration Characteristics of Composite Shells of Revolution With Variable Stiffness Coefficients

2008 ◽  
Author(s):  
Altan Kayran
Keyword(s):  
Free Vibration ◽  
Constitutive Relations ◽  
Variable Stiffness ◽  
Vibration Characteristics ◽  
Filament Winding ◽  
Shell Of Revolution ◽  
Composite Shells ◽  
Shells Of Revolution ◽  
Stiffness Coefficients ◽  
Filament Wound Composite

In the present study, the effect of initial winding angle, and the starting edge of the winding operation on the variation of the thickness, stiffness coefficients and undamped free vibration characteristics of filament wound composite shells of revolution are investigated. Filaments are assumed to be placed along the geodesic fiber path on the surface of the shell of revolution resulting in the variation of the stiffness coefficients and thickness along the axis of the composite shell of revolution with general meridional curvature. The study is performed by a semi-analytical solution method which exploits the combination of the numerical integration technique, and a modified frequency trial method. The governing shell of revolution equations comprise the full anisotropic form of the constitutive relations, including first order transverse shear deformation, and all components of translatory and rotary inertia. Results are obtained for conical and spherical shells of revolution manufactured by the filament winding process, and the effect of the winding pattern on the vibration characteristics of shells of revolution is investigated thoroughly.

Effect of Semi-Geodesic Winding on the Vibration Characteristics of Filament Wound Shells of Revolution

2011 ◽  
Vol 78 (6) ◽  
Author(s):  
Altan Kayran ◽  
Can Serkan İbrahimoğlu
Keyword(s):  
Free Vibration ◽  
Natural Frequencies ◽  
Vibration Characteristics ◽  
Vibration Modes ◽  
Integration Technique ◽  
Shells Of Revolution ◽  
Spherical Shells ◽  
Filament Wound ◽  
Winding Angle ◽  
Dominant Parameter

The effect of semigeodesic winding on the free vibration characteristics of filament wound shells of revolution is studied. For this purpose multisegment numerical integration technique is extended to the solution of the free vibration problem of composite shells of revolution which are wound along the semigeodesic fiber paths counting on the preset friction used during the winding process. Sample results are obtained for truncated conical and spherical shells of revolution and the effect of preset friction on the vibration characteristics of filament wound shells of revolution is particularly analyzed. Results show that when the preset friction is increased natural frequencies of higher circumferential vibration modes also increase irrespective of the initial winding angle, and the circumferential bending stiffness stands out as the dominant parameter governing the natural frequencies of higher circumferential vibration modes.

scholarly journals Lightweight design of variable-angle filament-wound cylinders combining Kriging-based metamodels with particle swarm optimization

2021 ◽  
Author(s):  
Zhihua Wang ◽  
José Humberto S. Almeida ◽  
Aravind Ashok ◽  
Zhonglai Wang ◽  
Saullo G. P. Castro
Keyword(s):  
Particle Swarm Optimization ◽  
Design Space ◽  
Lightweight Design ◽  
Particle Swarm ◽  
Variable Stiffness ◽  
Axial Direction ◽  
General Purpose ◽  
Swarm Optimization ◽  
Variable Angle ◽  
Filament Wound

Variable-angle filament-wound (VAFW) cylinders are herein optimized for minimum mass under manufacturing constraints, and for various design loads. A design parameterization based on a second-order polynomial variation of the tow winding angle along the axial direction of the cylinders is utilized to explore the nonlinear steering-thickness dependency in VAFW structures, whereby the thickness becomes a function of the fiber angle. Particle swarm optimization coupled with several Kriging-based metamodels is developed to find the optimum designs. A single-curvature Bogner-Fox-Schmit-Castro finite element is formulated to accurately and efficiently represent the variable stiffness properties of the shells, and verifications are performed using a general-purpose plate element. Alongside the main optimization studies, a vast analysis on the design space is performed using the metamodels, showing a gap in the design space for the buckling strength that is confirmed by genetic algorithm optimizations. Extreme lightweight whilst buckling resistant designs are found, along with non-conventional optimum layouts thanks to the high degree of thickness build-up tailoring.

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