Structural analysis of floating offshore remote terminal for deep sea fishing

Productivity of offshore fishing can increase if there are offshore terminals providing services such as fish unloading and repair of crafts and gears to the fishing fleets. This research proposed the use of FORT (fishing offshore remote terminal) as a very large floating structure (VLFS). Structura...

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Main Author:	Abdul Malik, Asmawi
Format:	Thesis
Language:	English
Published:	2018
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.utm.my/id/eprint/85770/7/AsmawiAbdulMalikPSKM2018.pdf
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spelling	my-utm-ep.857702020-07-30T07:30:53Z Structural analysis of floating offshore remote terminal for deep sea fishing 2018 Abdul Malik, Asmawi TJ Mechanical engineering and machinery Productivity of offshore fishing can increase if there are offshore terminals providing services such as fish unloading and repair of crafts and gears to the fishing fleets. This research proposed the use of FORT (fishing offshore remote terminal) as a very large floating structure (VLFS). Structural analysis is key in the design of VLFS. The research developed an adaptable framework to simulate FORT's hydroelastic interaction and motion using Newtonian's harmonic method. The governing partial differential equation of motion including the effect of deformation and torsional inertia was expressed in a dimensionless form. A finite difference algorithm was employed to transform the differential equations into linear algebraic equations. Linear and nonlinear dynamic responses was obtained using Hamilton principle with modal superposition coupled with finite element methods. Sensitivity tests are performed to quanti$z the effect of changing numerical parameter. Variety of plate models is investigated. Techno-economic model is also developed. The solution for a selected load condition has been presented. The result on hydroelastic response for several wavelength q (0.12, 0.23 and 0.43) to structural length ratios (l:1,2:r and 4:1) revealed longish F9RT experiences higher elastic deformations as comparc a square FORT for higher wavelength. In continuous springing freeboard reaction, the safe margin decreases from 4m to below 2m at higher wavelength ratio. At small wave length the hydroelastic response is the smallest for the lower ratio orientation. It is found that hydroelastic response is minimal as aspect ratio close to 1. Resultant stress on FORT stiffness when aspect ratio approaches 1 amplifies response amplitude by 35%. Sensitivity test indicates, for full load condition, larger structure will experience larger deformation stress (0.928 MN/m2 for 250m, 1.035MN/m2 for 500m, 1.035MN/m2 for 1000m). Permanent plastic deformation starts occurr ing at 20o and worsen at 45o causing higher shear force and moment. Maximum torsional force exceeds 51.25N/m2. For long crest of 0.43 maximum torsional deflection measured are250m(19.32N/m2 for 250m), 500m (27.55N/m2 for 500m), and 1000m 1za.o:\Vm2 for 1000m). Net present value of F9RT is NPV of 146mil, internal rate of return of 22.94% overl5 years. FORT as a new concept is thus techno economically feasible. The analytical model developed is a comprehensive tool for FORT designers. 2018 Thesis http://eprints.utm.my/id/eprint/85770/ http://eprints.utm.my/id/eprint/85770/7/AsmawiAbdulMalikPSKM2018.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:134239 phd doctoral Universiti Teknologi Malaysia, Faculty of Engineering - Faculty of Engineering - School of Mechanical Engineering Faculty of Engineering - School of Mechanical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Abdul Malik, Asmawi Structural analysis of floating offshore remote terminal for deep sea fishing
description	Productivity of offshore fishing can increase if there are offshore terminals providing services such as fish unloading and repair of crafts and gears to the fishing fleets. This research proposed the use of FORT (fishing offshore remote terminal) as a very large floating structure (VLFS). Structural analysis is key in the design of VLFS. The research developed an adaptable framework to simulate FORT's hydroelastic interaction and motion using Newtonian's harmonic method. The governing partial differential equation of motion including the effect of deformation and torsional inertia was expressed in a dimensionless form. A finite difference algorithm was employed to transform the differential equations into linear algebraic equations. Linear and nonlinear dynamic responses was obtained using Hamilton principle with modal superposition coupled with finite element methods. Sensitivity tests are performed to quanti$z the effect of changing numerical parameter. Variety of plate models is investigated. Techno-economic model is also developed. The solution for a selected load condition has been presented. The result on hydroelastic response for several wavelength q (0.12, 0.23 and 0.43) to structural length ratios (l:1,2:r and 4:1) revealed longish F9RT experiences higher elastic deformations as comparc a square FORT for higher wavelength. In continuous springing freeboard reaction, the safe margin decreases from 4m to below 2m at higher wavelength ratio. At small wave length the hydroelastic response is the smallest for the lower ratio orientation. It is found that hydroelastic response is minimal as aspect ratio close to 1. Resultant stress on FORT stiffness when aspect ratio approaches 1 amplifies response amplitude by 35%. Sensitivity test indicates, for full load condition, larger structure will experience larger deformation stress (0.928 MN/m2 for 250m, 1.035MN/m2 for 500m, 1.035MN/m2 for 1000m). Permanent plastic deformation starts occurr ing at 20o and worsen at 45o causing higher shear force and moment. Maximum torsional force exceeds 51.25N/m2. For long crest of 0.43 maximum torsional deflection measured are250m(19.32N/m2 for 250m), 500m (27.55N/m2 for 500m), and 1000m 1za.o:\Vm2 for 1000m). Net present value of F9RT is NPV of 146mil, internal rate of return of 22.94% overl5 years. FORT as a new concept is thus techno economically feasible. The analytical model developed is a comprehensive tool for FORT designers.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Abdul Malik, Asmawi
author_facet	Abdul Malik, Asmawi
author_sort	Abdul Malik, Asmawi
title	Structural analysis of floating offshore remote terminal for deep sea fishing
title_short	Structural analysis of floating offshore remote terminal for deep sea fishing
title_full	Structural analysis of floating offshore remote terminal for deep sea fishing
title_fullStr	Structural analysis of floating offshore remote terminal for deep sea fishing
title_full_unstemmed	Structural analysis of floating offshore remote terminal for deep sea fishing
title_sort	structural analysis of floating offshore remote terminal for deep sea fishing
granting_institution	Universiti Teknologi Malaysia, Faculty of Engineering - Faculty of Engineering - School of Mechanical Engineering
granting_department	Faculty of Engineering - School of Mechanical Engineering
publishDate	2018
url	http://eprints.utm.my/id/eprint/85770/7/AsmawiAbdulMalikPSKM2018.pdf
_version_	1747818452046839808

Structural analysis of floating offshore remote terminal for deep sea fishing

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