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Andersen, Poul
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Hydro-Elastic Tailoring and Optimization of a Composite Marine Propeller
Abstract
The following paper deals with the design and optimization of a flexible composite marine propeller. The blade shape is obtained from an existing high skew metal propeller. The aim is to tailor the laminate to control the elastic couplings and therefore the deformed shape of the blade. The development of a hydroelastic code is described first where the finite element method and boundary element method are used for the structural and hydrodynamic sub-models, respectively. The equilibrium between the elastic and hydrodynamic forces is obtained by direct substitution. NOMADm, a mesh adaptive direct search filter algorithm, is used together with DACE, a surface fitting algorithm, to determine the optimal laminate lay-up and blade pitch angle. The optimal configurations which reduce the fuel consumption for the combination of two load cases are found. The strength requirements are then analyzed using the Tsai-Wu failure criteria. The results show that it is possible to design a flexible composite marine propeller that will enable a reduction of the fuel consumption while withstanding the imposed loads.