Finite element modelling and model updating of small scale composite propellers

Maljaars, P.J.; Kaminski, M.L.; Besten, J.H. den

doi:10.1016/j.compstruct.2017.04.023

Cited by 14 publications

(19 citation statements)

References 15 publications

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“…The stiffness contribution of the hub has been modelled by a full clamping of the propeller blade at the blade-hub interface. The models were discretised by quadratic solid elements using a 29 × 30 × 4 element distribution, meaning that 29, 30 and 4 elements are distributed in chord-wise, radial and through-thickness direction, respectively [13,27]. The added mass matrices have been computed from Equation (51) and diagonalised with a Hinton-Rock-Zienkiewicz lumping technique, which means that the diagonal entries of the full added mass matrix are scaled with the ratio of the sum of the entries that contribute to the motion in the same direction over the sum of the diagonal entries that contribute to the motion in that direction [7].…”

Section: Fluid Added Mass Validationmentioning

confidence: 99%

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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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Section: Fluid Added Mass Validationmentioning

confidence: 99%

“…For the structural modelling, the FEM package MSC MARC/Mentat has been used. The blade FEM modelling has been extensively described in [13,27]. In summary, the FEM models consist of one propeller blade without the hub part.…”

Section: Steady and Unsteady Bem-fem Couplingmentioning

confidence: 99%

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

Maljaars

Kaminski

Besten

2018

JMSE

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“…In the FEM modelling, special attention has been given to the establishment of the material orientations in composite blades. In [19,20], the importance of a proper material orientation for doubly curved structures has been described. Standard commercial FEM software packages are usually not able to define unambiguously the material orientations in complex geometries [19].…”

Section: Structure Modelmentioning

confidence: 99%

“…Standard commercial FEM software packages are usually not able to define unambiguously the material orientations in complex geometries [19]. In [20], an approach has been presented to determine the element dependent material orientations in doubly curved structures. In this method, the through thickness direction and the projection of the transverse laminate (90 • )-direction on the element surface is used to establish the material orientation per element.…”

Section: Structure Modelmentioning

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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“…The analytical method of the multi-row single-row nails connection used in this paper is based on the elastic statically indeterminate method, which takes into account the tensile stiffness of the connecting pieces, the diameter and pitch of the fasteners, but does not take into account the bending stiffness of the connected parts [3] . For the form of double lap connection by the 1 row×4 rows of nails (shown in Figure. For the same upper and lower plates, the load of the fasteners is calculated as follows:…”

Section: Engineering Algorithm Of Composites Connectionmentioning

confidence: 99%

Finite Element Analysis of Multiple Bolted Connection between Composites and Metal Materials

Fan¹,

Han²

2017

Proceedings of the 2017 5th International Conference on Mechatronics, Materials, Chemistry and Computer Engineering (ICMMCCE 20

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Abstract:Two finite element models based on PATRAN/ NASTRAN are carried out to determine the nail load distribution of double lap structure with composites and metal materials. And the results were compared with the classical stiffness algorithm to verify the simulation model is effectiveness to calculate pin load distribution. Results show that the pin load distribution of the double-lap joints is uneven. It has a similar shape to bathtub. The modeling method with CBUSH can be used in pin-load distribution and CGAP can be used in hole edge stress concentration of composite laminates. The conclusions have been obtained to offer useful engineering-oriented reference for the design of multi-fastener joints in laminated composite plates.

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Finite element modelling and model updating of small scale composite propellers

Cited by 14 publications

References 15 publications

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

Finite Element Analysis of Multiple Bolted Connection between Composites and Metal Materials

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