High Fidelity Hydroelastic Analysis Using Modal Matrix Reduction
Open Access
- 1 June 2023
- journal article
- research article
- Published by MDPI AG in Journal of Marine Science and Engineering
- Vol. 11 (6), 1168
- https://doi.org/10.3390/jmse11061168
Abstract
Structural assessment is a main concern when designing and operating any sort of offshore structure. This assessment is meant to ensure that the structural integrity is preserved along the lifespan of the asset, withstanding the worst sea-states that will be encountered and making sure that the accumulated fatigue damage will not jeopardize its structural integrity neither. The purpose of this paper is to present a fast and reliable hydroelastic model. This model is based on time-domain tight-coupling of a three-dimensional FEM (finite element method) linear structural model and a three-dimensional FEM seakeeping hydrodynamics model. In order to reduce the computational cost of structural dynamic simulations, the high-fidelity structural solution is projected onto the modal basis to obtain the modal matrix system and to extend the response amplitude operators (RAO) to the modal responses (MRAO). From there, the number of structural degrees of freedom can be greatly reduced by retaining only those eigenmodes preserving most of the structural elastic energy. The use MRAOs and/or the large reduction in structural degrees of freedom allows us to: first, quickly analyse the large number of loadcases required on the design stage; and second, to implement a digital twin for structural health monitoring in operational conditions. The paper also presents an application case of the developed methodology.Funding Information
- European Commission (952966, 101006860)
- Ministerio de Ciencia e Innovación (PID2021-126561OB-C31)
This publication has 12 references indexed in Scilit:
- Fully 3D ship hydroelasticity: Monolithic versus partitioned strategies for tight couplingMarine Structures, 2021
- Analysis of the hydroelastic effect on a container vessel using coupled BEM–FEM method in the time domainShips and Offshore Structures, 2019
- Predictions of Ship Extreme Hydroelastic Load Responses in Harsh Irregular Waves and Hull Girder Ultimate Strength AssessmentApplied Sciences, 2019
- Nonlinear time-domain hydroelastic analysis for a container ship in regular and irregular head waves by the Rankine panel methodShips and Offshore Structures, 2018
- A comprehensive study on ship motion and load responses in short-crested irregular wavesInternational Journal of Naval Architecture and Ocean Engineering, 2018
- A time-domain second-order FEM model for the wave diffraction-radiation problem. Validation with a semisubmersible platformMarine Structures, 2018
- Hydroelastic analysis of global and local ship response using 1D–3D hybrid structural modelShips and Offshore Structures, 2018
- A FEM fluid–structure interaction algorithm for analysis of the seal dynamics of a Surface-Effect ShipComputer Methods in Applied Mechanics and Engineering, 2015
- Accelerated 3D multi-body seakeeping simulations using unstructured finite elementsJournal of Computational Physics, 2013
- Fatigue damage calculation of ULCS based on hydroelastic model for springingShips and Offshore Structures, 2013