Hydro-elastic analysis and optimization of a composite marine propeller

Blasques, José Pedro Albergaria Amaral; Berggreen, Christian; Andersen, Poul

doi:10.1016/j.marstruc.2009.10.002

Cited by 54 publications

(19 citation statements)

References 8 publications

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“…In the marine fields, composite materials are generally used to the hulls of boats and yachts excluding huge vessels. Recently, the studies of marine propellers are focused on the application of composite materials [1][2][3][4][5][6][7] . Composites can have advantages of high elasticity, damping and specific strength compared with metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Study on Composite Material Marine Propellers

Yamatogi¹,

Murayama

Uzawa

et al. 2011

Marine Engineering

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In this study, the authors conducted mechanical property tests and the vibration characteristic tests of CFRP (carbon fiber reinforced plastics) specimens that can be adopted as new marine propeller materials. CFRP materials exhibited higher strength than NAB (nickel aluminum bronze casting) which is conventionally used as material for marine propellers. The damping ratio of CFRP materials was four times larger or more than that of NAB. In field tests using a small fishing boat, two types of CFRP propellers were manufactured by using CF-prepreg. One propeller was laminated with CF-Fabric and another with CF-UD, to obtain a quasi-isotropic composite. These are the so-called "built-up type" as three CFRP blades were assembled in an NAB boss. An NAB propeller of the so-called "mono-block type" was also manufactured to facilitate comparison with CFRP propellers. Analyses of field test results are ongoing. In vibration tests, the damping ratios of the both types of CFRP propellers were about ten times larger than that of the NAB propeller. Cavitation which can cause erosion on the surface is a severe problem for FRP propellers. Therefore, we cavitation erosion resistances for eight kinds of FRP and an NAB were evaluated in cavitation tests using a magnetostriction ultrasonic transducer. The cavitation erosion resistance of the NAB was much superior to that of FRP materials. However, it was found that aramid fibers on the surface of FRP can improve the erosion resistance. In order to improve the erosion resistance of FRP materials to the same level as that of NAB, the further research is necessary.

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Section: Introductionmentioning

confidence: 99%

Study on Composite Material Marine Propellers

Yamatogi¹,

Murayama

Uzawa

et al. 2011

Marine Engineering

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“…These methods typically involve partitioned fluid-structure interaction (FSI) computations, meaning that the fluid and structural problem are separately solved and coupling iterations are required to converge to the fully coupled solution. For steady propeller FSI computations mainly Reynolds-averaged Navier-Stokes (RANS) methods [1][2][3][4] and boundary element methods (BEM) [5][6][7][8][9][10][11][12] have been used for solving the fluid part of the coupled problem.…”

Section: Introductionmentioning

confidence: 99%

Boundary Element Modelling Aspects for the Hydro-Elastic Analysis of Flexible Marine Propellers

Maljaars

Kaminski

Besten

2018

JMSE

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Boundary element methods (BEM) have been used for propeller hydrodynamic calculations since the 1990s. More recently, these methods are being used in combination with finite element methods (FEM) in order to calculate flexible propeller fluid-structure interaction (FSI) response. The main advantage of using BEM for flexible propeller FSI calculations is the relatively low computational demand in comparison with higher fidelity methods. However, the BEM modelling of flexible propellers is not straightforward and requires several important modelling decisions. The consequences of such modelling choices depend significantly on propeller structural behaviour and flow condition. The two dimensionless quantities that characterise structural behaviour and flow condition are the structural frequency ratio (the ratio between the lowest excitation frequency and the fundamental wet blade natural frequency) and the reduced frequency. For both, general expressions have been derived for (flexible) marine propellers. This work shows that these expressions can be effectively used to estimate the dry and wet fundamental blade frequencies and the structural frequency ratio. This last parameter and the reduced frequency of vibrating blade flows is independent of the geometrical blade scale as shown in this work. Regarding the BEM-FEM coupled analyses, it is shown that a quasi-static FEM modelling does not suffice, particularly due to the fluid-added mass and hydrodynamic damping contributions that are not negligible. It is demonstrated that approximating the hydro-elastic blade response by using closed form expressions for the fluid added mass and hydrodynamic damping terms provides reasonable results, since the structural response of flexible propellers is stiffness dominated, meaning that the importance of modelling errors in fluid added mass and hydrodynamic damping is small. Finally, it is shown that the significance of recalculating the hydrodynamic influence coefficients is relatively small. This fact might be utilized, possibly in combination with the use of the closed form expressions for fluid added mass and hydrodynamic damping contributions, to significantly reduce the computation time of flexible propeller FSI calculations.

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“…RANS solvers were used in the flexible propeller FSI computations presented in [1][2][3][4]. BEM solvers were applied in the hydro-elastic propeller analysis as presented in [5][6][7][8][9][10][11][12]. In the hydro-elastic coupling, procedures presented in [13,14] VLM solvers were applied.…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of Fluid–Structure Interaction Computations of Flexible Composite Propellers in Open Water Conditions Using BEM-FEM and RANS-FEM Methods

Maljaars

Bronswijk

Windt

et al. 2018

JMSE

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In the past several decades, many papers have been published on fluid-structure coupled calculations to analyse the hydro-elastic response of flexible (composite) propellers. The flow is usually modelled either by the Navier-Stokes equations or as a potential flow, by assuming an irrotational flow. Phenomena as separation of the flow, flow transition, boundary layer build-up and vorticity dynamics are not captured in a non-viscous potential flow. Nevertheless, potential flow based methods have been shown to be powerful methods to resolve the hydrodynamics of propellers. With the upcoming interest in flexible (composite) propellers, a valid question is what the consequences of the potential flow simplifications are with regard to the coupled fluid-structure analyses of these types of propellers. This question has been addressed in the following way: calculations and experiments were conducted for uniform flows only, with a propeller geometry that challenges the potential flow model due to its sensitivity to leading edge vortex separation. Calculations were performed on the undeformed propeller geometry with a Reynolds-averaged-Navier-Stokes (RANS) solver and a boundary element method (BEM). These calculations show some typical differences between the RANS and BEM results. The flexible propeller responses were predicted by coupled calculations between BEM and finite element method (FEM) and RANS and FEM. The applied methodologies are briefly described. Results obtained from both calculation methods have been compared to experimental results obtained from blade deformation measurements in a cavitation tunnel. The results show that, even for the extreme cases, promising results have been obtained with the BEM-FEM coupling. The BEM-FEM calculated responses are consistent with the RANS-FEM results.

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Hydro-elastic analysis and optimization of a composite marine propeller

Cited by 54 publications

References 8 publications

Study on Composite Material Marine Propellers

Study on Composite Material Marine Propellers

Boundary Element Modelling Aspects for the Hydro-Elastic Analysis of Flexible Marine Propellers

Experimental Validation of Fluid–Structure Interaction Computations of Flexible Composite Propellers in Open Water Conditions Using BEM-FEM and RANS-FEM Methods

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