Heading Analysis Of Weathervaning Turret Moored Units

Ardhiansyah, Fahmy (2017) Heading Analysis Of Weathervaning Turret Moored Units. Masters thesis, Institut Teknlogi Sepuluh Nopember.

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Abstract

This thesis report presents the heading analysis study of weathervaning turret moored unit. Design wave heading is to be in accordance with the operational conditions for the sea states contributing the most to the long term value of the dominant load effect. From the heading analysis over each of the sea states contained in the time-series, the mean heading of the floating structure can be obtained. The objective of this study is to assess heading analysis outcome as function of heading probability occurrences of weathervaning turret moored floating units and to identify optimum mooring layout design respect to heading analysis result. The raiser question need to answer in this research is the importance of heading analysis in term of mooring system design. In order to calculate heading analysis the approach are collect and gather necessary data to enable proper heading analysis, build and generate numerical model of vessel by describing the capability to weathervane, and assess the mean heading of the unit under the environment of each element. And to perform mooring analysis the global analysis of the coupled vessel-lines system will be performed with MOSES software packages and numerical tools, both in the time-domain and frequency-domain. The heading analysis results indicated that the most affected external forces that causing vessel mean heading is dedicated by wind, it is seen the relative heading between wind and vessel heading is quite small (<10degree) with large occurrence probability (up to 45%). By investigating proposed nine (9) anchor orientation, the heading study is necessary to find out the optimum mooring system layout in accordance to extreme environment load and fatigue environment load as well to be accordance with ABS requirement. =============================================================== This thesis report presents the heading analysis study of weathervaning turret moored unit. Design wave heading is to be in accordance with the operational conditions for the sea states contributing the most to the long term value of the dominant load effect. From the heading analysis over each of the sea states contained in the time-series, the mean heading of the floating structure can be obtained. The objective of this study is to assess heading analysis outcome as function of heading probability occurrences of weathervaning turret moored floating units and to identify optimum mooring layout design respect to heading analysis result. The raiser question need to answer in this research is the importance of heading analysis in term of mooring system design. In order to calculate heading analysis the approach are collect and gather necessary data to enable proper heading analysis, build and generate numerical model of vessel by describing the capability to weathervane, and assess the mean heading of the unit under the environment of each element. And to perform mooring analysis the global analysis of the coupled vessel-lines system will be performed with MOSES software packages and numerical tools, both in the time-domain and frequency-domain. The heading analysis results indicated that the most affected external forces that causing vessel mean heading is dedicated by wind, it is seen the relative heading between wind and vessel heading is quite small (<10degree) with large occurrence probability (up to 45%). By investigating proposed nine (9) anchor orientation, the heading study is necessary to find out the optimum mooring system layout in accordance to extreme environment load and fatigue environment load as well to be accordance with ABS requirement.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Heading Analysis, Weathervaning Units, Mooring System Design
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures--Models
V Naval Science > V Naval Science (General)
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions: Faculty of Marine Technology > Naval Architecture > (S2) Master Theses
Depositing User: - Fahmy Ardhiansyah
Date Deposited: 04 May 2017 02:51
Last Modified: 04 May 2017 02:53
URI: http://repository.its.ac.id/id/eprint/3814

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