Full time-domain nonlinear coupled dynamic analysis of a truss spar and its mooring/riser system in irregular wave

Yang, Mengmeng; Teng, Bin; Xiao, Longfei; Ning, Dezhi; Shi, Zuoqiang; Yan, Qing

doi:10.1007/s11433-013-5273-4

Cited by 17 publications

(8 citation statements)

References 11 publications

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“…Such floating structures are normally anchored to the seabed with catenary or (semi) taut mooring systems. With the increase of water depth, the dynamic interactions between floating platform and its mooring system become increasingly important [2].…”

Section: Introductionmentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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As the offshore engineering moving from shallow to deep waters, the foundation types for fixed and floating platforms have been gradually evolving to minimize engineering costs and structural risks in the harsh offshore environments. Particular focus of this paper is on the foundation instability and its failure mechanisms as well as the relevant theory advances for the prevailing foundation types in both shallow and deep water depths. Piles, spudcans, gravity bases, suction caissons, and plate anchors are detailed in this paper. The failure phenomena and mechanisms for each type of foundations are identified and summarized, respectively. The theoretical approaches along with sophisticated empirical solutions for the bearing capacity problems are then presented. The major challenges are from flow-structure-soil coupling processes, rigorous constitutive modeling of cyclic behaviors of marine sediments, and the spatial variability of soil properties for large-spreading structures. Further researches are suggested to reveal the instability mechanisms for underpinning the evolution of offshore foundations. Citation:Gao F P, Li J H, Qi W G, et al. On the instability of offshore foundations: theory and mechanism.

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Section: Introductionmentioning

confidence: 99%

On the instability of offshore foundations: theory and mechanism

Gao

et al. 2015

Sci. China Phys. Mech. Astron.

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“…Based on the scale ratio of 1:60 and the maximum water depth of the wave basin, a truncated mooring system was designed and modelled for a truncated water depth of 600 m. In total, seven models of top-tensioned risers, including six production risers and one drilling riser, were vertically installed through the moon pool of the spar and in the deep pit without truncation. Additional details including the mooring and riser systems are given in [36].…”

Section: Parameter Estimationmentioning

confidence: 99%

LH-moment estimation for statistical analysis on the wave crest distributions of a deepwater spar platform model test

et al. 2017

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The design of fixed and compliant offshore platforms requires the reliable estimation of extreme values with small probabilities of exceedance based on an appropriate probability distribution. The Weibull distribution is commonly utilised for the statistical analysis of wave crests, including near-field wave run-ups. The parameters are estimated empirically from experimental or onsite measurements. In this paper, the data set of wave crests from a Spar model test was statistically analysed by using the method of LH-moments for parameter estimation of the Weibull distribution. The root-mean-square errors (RMSEs) and the error of LH-kurtosis were used to examine the goodness-of-fit. The results for the first four LH-moments, the estimated parameters, and the probability distributions showed that the level of the LH-moments has a significant influence. At higher levels, the estimation results gave a more focused representation of the upper part of the wave crest distributions, which indicates consistency with the intention of the method of LH-moments. The low tail RMSE values of less than 2.5% demonstrated that a Weibull distribution model estimated by using high-level LH-moments can accurately represent the probability distribution of large extreme wave crests for incident waves, wave run-ups, and moon pool waves. Goodness-of-fit test on the basis of comparison of sampling LH-kurtosis and theoretical LH-kurtosis was recommended as a procedure for selecting an optimum level

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“…Mooring system is required in order to hold floating platforms such as cages or aquaculture farms against the available external forces (Zhao et al 2012;Yang et al 2014;Cifuentes and Kim 2015;Pan et al 2016). These external forces are mainly comprised of wind, current and wave.…”

Section: Offshore Aquaculture With Its Mooring Systemmentioning

confidence: 99%

Simulation of offshore aquaculture system for macro algae (seaweed) oceanic farming

Olanrewaju

Magee

Kader

et al. 2016

Ships and Offshore Structures

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Large-scale cultivation of seaweed has become one of the most important aquaculture activities in Malaysia which may help increase farmers' incomes as well as seaweed itself can be processed into many beneficial end products. The present location of seaweed farming selected by farmers is situated close proximity to the coastline which is between 100 and 200 m from the seashore. The unfavourable condition of sea during rough sea with high wave and high speed of current is always a problem to the farmers since this environmental condition destroys their seaweed planting lines. To avoid the above problem, especially in monsoon prone area, a thorough analysis needs to be done in order to prevent environmental load from destroying seaweed platform on its mooring line when subjected to greater stress. The main objective of this study is to perform a simulation study which will allow analysis of the best mooring system for multi-body floating seaweed farm, together with understanding of the reliability and effectiveness of the system. This paper presents the design of seaweed platform model with mooring assessment in order to obtain a comprehensive and reliable seaweed mooring platform with the aid of mooring simulation software and model tests.

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Full time-domain nonlinear coupled dynamic analysis of a truss spar and its mooring/riser system in irregular wave

Cited by 17 publications

References 11 publications

On the instability of offshore foundations: theory and mechanism

On the instability of offshore foundations: theory and mechanism

LH-moment estimation for statistical analysis on the wave crest distributions of a deepwater spar platform model test

Simulation of offshore aquaculture system for macro algae (seaweed) oceanic farming

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