Numerical modelling of fluidstructure and structure- structure interaction

Dissertation

Matti Hakala

Research output: ThesisDissertationMonograph

Abstract

Fluid-structure and structure-structure interaction in ship vibration are analysed and numerical calculation procedures based on the finite element method are developed.In the fluid-structure interaction analysis both the ship structure and the surrounding fluid are modelled three-dimensionally.The fluid effect is taken into account in the form of an added mass matrix.The coupled vibration problem is solved using the so-called modal approach, i.e. the dry modes of the structure are used as Ritz functions in the final solution.The structure structure interaction problem, involving the coupling of global and local vibration, is treated by first constructing separate models for global and local behaviour.The coupling is taken into account at a later stage using a dynamic coupling matrix and the separately calculated global and local modes.For the global modelling, a novel deck finite element is developed.A parametric study is performed in a case of a simple model resembling a boxlike ship to reveal the relative importance of various parameters in the interaction process.The developed procedures are tested using an example structure, for which experimental results are also available. The accuracy of the global-local approach and the truncation errors in the modal solution are studied.
Original languageEnglish
QualificationDoctor Degree
Awarding Institution
  • Helsinki University of Technology
Place of PublicationEspoo
Publisher
Print ISBNs951-38-2305-9
Publication statusPublished - 1985
MoE publication typeG4 Doctoral dissertation (monograph)

Fingerprint

Ships
Fluids
Fluid structure interaction
Finite element method

Keywords

  • ship vibration
  • fluid-structure interaction
  • structure-structure interaction
  • numerical modelling

Cite this

Hakala, M. (1985). Numerical modelling of fluidstructure and structure- structure interaction: Dissertation. Espoo: VTT Technical Research Centre of Finland.
Hakala, Matti. / Numerical modelling of fluidstructure and structure- structure interaction : Dissertation. Espoo : VTT Technical Research Centre of Finland, 1985. 64 p.
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abstract = "Fluid-structure and structure-structure interaction in ship vibration are analysed and numerical calculation procedures based on the finite element method are developed.In the fluid-structure interaction analysis both the ship structure and the surrounding fluid are modelled three-dimensionally.The fluid effect is taken into account in the form of an added mass matrix.The coupled vibration problem is solved using the so-called modal approach, i.e. the dry modes of the structure are used as Ritz functions in the final solution.The structure structure interaction problem, involving the coupling of global and local vibration, is treated by first constructing separate models for global and local behaviour.The coupling is taken into account at a later stage using a dynamic coupling matrix and the separately calculated global and local modes.For the global modelling, a novel deck finite element is developed.A parametric study is performed in a case of a simple model resembling a boxlike ship to reveal the relative importance of various parameters in the interaction process.The developed procedures are tested using an example structure, for which experimental results are also available. The accuracy of the global-local approach and the truncation errors in the modal solution are studied.",
keywords = "ship vibration, fluid-structure interaction, structure-structure interaction, numerical modelling",
author = "Matti Hakala",
year = "1985",
language = "English",
isbn = "951-38-2305-9",
series = "Publications / Technical Research Centre of Finland",
publisher = "VTT Technical Research Centre of Finland",
number = "22",
address = "Finland",
school = "Helsinki University of Technology",

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Hakala, M 1985, 'Numerical modelling of fluidstructure and structure- structure interaction: Dissertation', Doctor Degree, Helsinki University of Technology, Espoo.

Numerical modelling of fluidstructure and structure- structure interaction : Dissertation. / Hakala, Matti.

Espoo : VTT Technical Research Centre of Finland, 1985. 64 p.

Research output: ThesisDissertationMonograph

TY - THES

T1 - Numerical modelling of fluidstructure and structure- structure interaction

T2 - Dissertation

AU - Hakala, Matti

PY - 1985

Y1 - 1985

N2 - Fluid-structure and structure-structure interaction in ship vibration are analysed and numerical calculation procedures based on the finite element method are developed.In the fluid-structure interaction analysis both the ship structure and the surrounding fluid are modelled three-dimensionally.The fluid effect is taken into account in the form of an added mass matrix.The coupled vibration problem is solved using the so-called modal approach, i.e. the dry modes of the structure are used as Ritz functions in the final solution.The structure structure interaction problem, involving the coupling of global and local vibration, is treated by first constructing separate models for global and local behaviour.The coupling is taken into account at a later stage using a dynamic coupling matrix and the separately calculated global and local modes.For the global modelling, a novel deck finite element is developed.A parametric study is performed in a case of a simple model resembling a boxlike ship to reveal the relative importance of various parameters in the interaction process.The developed procedures are tested using an example structure, for which experimental results are also available. The accuracy of the global-local approach and the truncation errors in the modal solution are studied.

AB - Fluid-structure and structure-structure interaction in ship vibration are analysed and numerical calculation procedures based on the finite element method are developed.In the fluid-structure interaction analysis both the ship structure and the surrounding fluid are modelled three-dimensionally.The fluid effect is taken into account in the form of an added mass matrix.The coupled vibration problem is solved using the so-called modal approach, i.e. the dry modes of the structure are used as Ritz functions in the final solution.The structure structure interaction problem, involving the coupling of global and local vibration, is treated by first constructing separate models for global and local behaviour.The coupling is taken into account at a later stage using a dynamic coupling matrix and the separately calculated global and local modes.For the global modelling, a novel deck finite element is developed.A parametric study is performed in a case of a simple model resembling a boxlike ship to reveal the relative importance of various parameters in the interaction process.The developed procedures are tested using an example structure, for which experimental results are also available. The accuracy of the global-local approach and the truncation errors in the modal solution are studied.

KW - ship vibration

KW - fluid-structure interaction

KW - structure-structure interaction

KW - numerical modelling

M3 - Dissertation

SN - 951-38-2305-9

T3 - Publications / Technical Research Centre of Finland

PB - VTT Technical Research Centre of Finland

CY - Espoo

ER -

Hakala M. Numerical modelling of fluidstructure and structure- structure interaction: Dissertation. Espoo: VTT Technical Research Centre of Finland, 1985. 64 p.