Key aspects of the structural design of small swath ships
Key aspects of the structural design of small swath ships
This study addresses the principal components of the structural design process with particular reference to small SWATH ships. Structural design criteria for aluminium alloy and glass reinforced polyester were developed with special regard to fatigue and creep considerations. Theoretical methods for predicting material properties of GRP laminates were evaluated against experimental data and found to be suitable for design purposes. Initial design stage load prediction algorithms were developed for hydrodynamic side force and slam pressure which were suitable for a microcomputer. Peak primary stresses due to side force were compared with those caused by the worst possible torque. Aluminium alloy and GRP (single skin and sandwich) were compared at both the local and ship level using purpose written structural design microcomputer programs. An evaluation procedure for SWATH ship designs was also developed which was suitable for investigating alternative material configurations. The need for further finite element based design studies was identified as a result of exploratory studies with the microcomputer-based structural design procedure developed in the course of this work. A simplified finite element representation of GRP sandwich structures was evaluated theoretically, and empirically by means of a physical model of a GRP-balsa sandwich SWATH section. The effects of changes to the geometry and framing system of small aluminium alloy SWATH ships were investigated using the finite element method. The same method was used to investigate the significance of core properties and side load for GRP sandwich SWATH ships. Designs for the haunch and strut of a 70 tonne SWATH ship were evolved for both aluminium alloy and GRP sandwich and a comparison made, which indicated a weight penalty was associated with the latter. An exploratory investigation of the potential of advanced composites indicated significant weight savings with respect to GRP.
University of Southampton
1989
Loscombe, Peter Robin
(1989)
Key aspects of the structural design of small swath ships.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
This study addresses the principal components of the structural design process with particular reference to small SWATH ships. Structural design criteria for aluminium alloy and glass reinforced polyester were developed with special regard to fatigue and creep considerations. Theoretical methods for predicting material properties of GRP laminates were evaluated against experimental data and found to be suitable for design purposes. Initial design stage load prediction algorithms were developed for hydrodynamic side force and slam pressure which were suitable for a microcomputer. Peak primary stresses due to side force were compared with those caused by the worst possible torque. Aluminium alloy and GRP (single skin and sandwich) were compared at both the local and ship level using purpose written structural design microcomputer programs. An evaluation procedure for SWATH ship designs was also developed which was suitable for investigating alternative material configurations. The need for further finite element based design studies was identified as a result of exploratory studies with the microcomputer-based structural design procedure developed in the course of this work. A simplified finite element representation of GRP sandwich structures was evaluated theoretically, and empirically by means of a physical model of a GRP-balsa sandwich SWATH section. The effects of changes to the geometry and framing system of small aluminium alloy SWATH ships were investigated using the finite element method. The same method was used to investigate the significance of core properties and side load for GRP sandwich SWATH ships. Designs for the haunch and strut of a 70 tonne SWATH ship were evolved for both aluminium alloy and GRP sandwich and a comparison made, which indicated a weight penalty was associated with the latter. An exploratory investigation of the potential of advanced composites indicated significant weight savings with respect to GRP.
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Published date: 1989
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Local EPrints ID: 461633
URI: http://eprints.soton.ac.uk/id/eprint/461633
PURE UUID: b70aa891-c070-423a-b191-a5d08d910aa1
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Date deposited: 04 Jul 2022 18:51
Last modified: 04 Jul 2022 18:51
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Author:
Peter Robin Loscombe
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