Transient effects of tendon disconnection of a TLP by hull–tendon–riser coupled dynamic analysis

Yang, Changdong; Kim, M.H.

doi:10.1016/j.oceaneng.2010.01.005

Cited by 72 publications

(19 citation statements)

References 9 publications

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“…Frequency-domain analysis was performed using WAMIT for hydrodynamic coefficients and wave forces. Subsequently, the time-domain 6DOF motion analysis was performed using CHARM3D (Ryu [4]; Yang [15]; Yang [16]; Bae [17]; Li [18]; Kim et al [19]). The DP FPSO vessel is a 200,000 ton tanker moored in 1829 m water depth.…”

Section: Time-domain Simulation Conditionsmentioning

confidence: 99%

Fuel-Optimal Thrust-Allocation Algorithm Using Penalty Optimization Programing for Dynamic-Positioning-Controlled Offshore Platforms

Kim

2018

Energies

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This research, a new thrust-allocation algorithm based on penalty programming is developed to minimize the fuel consumption of offshore vessels/platforms with dynamic positioning system. The role of thrust allocation is to produce thruster commands satisfying required forces and moments for position-keeping, while fulfilling mechanical constraints of the control system. The developed thrust-allocation algorithm is mathematically formulated as an optimization problem for the given objects and constraints of a dynamic positioning system. Penalty programming can solve the optimization problems that have nonlinear object functions and constraints. The developed penalty-programming thrust-allocation method is implemented in the fully-coupled vessel-riser-mooring time-domain simulation code with dynamic positioning control. Its position-keeping and fuel-saving performance is evaluated by comparing with other conventional methods, such as pseudo-inverse, quadratic-programming, and genetic-algorithm methods. In this regard, the fully-coupled time-domain simulation method is applied to a turret-moored dynamic positioning assisted FPSO (floating production storage offloading). The optimal performance of the penalty programming in minimizing fuel consumption in both 100-year and 1-year storm conditions is demonstrated compared to pseudo-inverse and quadratic-programming methods.

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Section: Time-domain Simulation Conditionsmentioning

confidence: 99%

Fuel-Optimal Thrust-Allocation Algorithm Using Penalty Optimization Programing for Dynamic-Positioning-Controlled Offshore Platforms

Kim

2018

Energies

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“…Low [105] used the same hybrid method to envisage the extreme responses of coupled floating structures. Yang and Kim [106] carried out coupled analysis of hull-tendon-riser for a TLP. The mooring line/riser/tendon system was modelled as an elastic rod.…”

Section: Analysis Technique Of Classic Sparmentioning

confidence: 99%

Review of offshore energy in Malaysia and floating Spar platform for sustainable exploration

Islam

Jameel

Jumaat

et al. 2012

Renewable and Sustainable Energy Reviews

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Rapidly rising trends of fuel consumption indicate enormous energy crisis of global proportions in near future. Following the trend, Malaysia's fuel consumption has been increasing by an annual rate of 7.2% since 1990 and has even reached 44.9 Mtoe in 2008. It is forecasted to reach 207.3 Mtoe by the year 2030. Due to serious depletion of reserves in various onshore locations, the exploration process is expanded to offshore deeper waters. Seven sedimentary basins belonging to Malaysia, in South China Sea, show great promise to be excellent sources of hydrocarbons. For deep-sea exploration fixed offshore structures are not feasible. An economical alternative is Spar platforms, which are floating structures ideal for exploration of deep water deposits. In this research, Malaysian experience in offshore hydrocarbon exploration is investigated. Various kinds of operational Spar platforms are censoriously explored and their recent technical developments are reviewed. The study reveals that Malaysia's primary energy requirements were met (in year 2008) with natural gas by 43.4% of the total, crude oil by 38.2%, coal by 15.3% and hydropower by 3.1%; indicating evidently that natural gas and crude oil are still the predominant energy sources. Out of the total energy, around 70% oil and 85% natural gas come from offshore fields. These large figures highlight the necessity to consider economically viable alternatives. Spar platform is an innovative marine structure designed to conduct such deep sea explorations. First commissioned Spar at Kikeh field of Malaysia is testimony to immense potential and possibilities of incorporating Spar platforms in the country's deep reserves for sustainable energy generation. Classic Spar, Truss Spar, Cell Spar and Cell-truss Spar are identified to be well suited for these environments. Since the offshore fields are located at waters with more than 1000 m depth, Spar platforms can be successfully installed at these Malaysian deep water fields.

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“…Sengupta and Ahmad (1996) studied reliability of the TLP structure with respect to the maximum and minimum tendon stress under stochastic excitation, they also determined the optimum strength of tethers for the maximum expected life of the platform. Kim and Yang (2010) studied the transient effect of tendon disconnection on the performance of the TLP during harsh environmental conditions and they observed that heave and pitch natural periods are affected by the tendon breakage.…”

Section: Introductionmentioning

confidence: 99%

TLP Structural Health Monitoring Based on Vibration Signal of Energy Harvesting System

Jahangiri

Mirab

Fathi

et al. 2016

Lat. Am. j. solids struct.

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Structural Health Monitoring (SHM) of Tension Leg Platform (TLP) is very crucial for preventing catastrophic and sudden collapse of the structures. One of the methods of monitoring these structures is implementing SHM sensors. Supplying energy for these sensors for a long period is a challenging problem. So, one of the new methods of supplying energy for SHM, is usage of mechanical energy. In this method, the piezoelectric material is employed to convert the mechanical energy which is resulted from vibration of structure, to electrical energy. The advantage of this method is based on not implementing the battery charging system. Therefore, in this paper, after modeling TLP structure, energy supplying of these sensors with piezoelectric converters is studied. Furthermore, fault diagnosis of these structures in the presence of different uncertainties is proposed by the features of voltage signal, produced from piezoelectric patches and fuzzy classification method. Results show that this method can diagnose faults of the structure with an acceptable success rate.

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Transient effects of tendon disconnection of a TLP by hull–tendon–riser coupled dynamic analysis

Cited by 72 publications

References 9 publications

Fuel-Optimal Thrust-Allocation Algorithm Using Penalty Optimization Programing for Dynamic-Positioning-Controlled Offshore Platforms

Fuel-Optimal Thrust-Allocation Algorithm Using Penalty Optimization Programing for Dynamic-Positioning-Controlled Offshore Platforms

Review of offshore energy in Malaysia and floating Spar platform for sustainable exploration

TLP Structural Health Monitoring Based on Vibration Signal of Energy Harvesting System

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