Filament wound articulated pressure structures are a novel class of pressure containers that show great potential for applications in the aerospace and commercial industries. The most important issues for the design of articulated structures reflect on the determination of the optimal meridional profile and the corresponding winding parameters. Previous researches limited their work into the geodesic-isotensoid design. However, the available design space is restricted due to the geometry of geodesics and the netting theory assumption. In this paper, the optimal design for determining the meridional profiles is outlined, subjected to geometrical limitations, stability-ensuring winding conditions and the Tsai-Wu failure criterion. The stress field is modeled using classical lamination theory, and the non-geodesic trajectories are employed to enlarge the design space and improve the structural performance. The cubic splines curve with equidistant interpolation knots is chosen to approximate the meridional profile. The objective is to maximize the performance factor by employing nonlinear optimization techniques. Two design problems are solved: firstly the optimal meridional profile is determined under the given opening radius and the slippage coefficient. Secondly, the different optimal profiles with various slippage coefficients are obtained to demonstrate the effect non-geodesic trajectories have on the geometry and performance of articulated pressure structures. The optimal profiles derived by the present method are compared with the geodesic-isotensoid profile with the same polar opening radius. Results reveal that the articulated structure designed using the present method has stronger structure and greater internal volume than that using geodesic-isotensoid method. The present method is convenient for the optimal design of meridional profiles of articulated pressure vessels by means of non-geodesic fiber placement.
Optimal shapes and winding parameters for filament wound articulated vessels
2008
17 Seiten, 8 Bilder, 1 Tabelle, 17 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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