Probabilistic analysis and fatigue life assessment of floating collar of fish cage due to random wave loads

Bai, Xiaodong; Zhao, Yunpeng; Dong, Guohai; Bi, Chen

doi:10.1016/j.apor.2018.09.018

Cited by 19 publications

(9 citation statements)

References 36 publications

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“…Kristiansen and Faltinsen [7] proposed a screen type of force model for the current loads on net cages. Bai et al [8] assessed the fatigue life to the floating collar of a fish cage under random wave loads. The basic idea behind multi-purpose platforms is to devise a platform able to exploit the synergies among different offshore industries, providing a cheaper alternative than single-use platforms.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Coupled Dynamics of an Offshore Floating Multi-Purpose Platform: Part A — Rigid Body Analysis

Collu

Ruzzo

et al. 2019

Volume 6: Ocean Space Utilization

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A multi-purpose platform (MPP) is an offshore system designed to serve the purposes of more than one offshore industry. Indeed, over the past decades, a number of industries have expanded, or are expanding, from onshore to offshore locations (renewables, aquaculture, tourism, mineral extractions, etc.), and the research on these type of platform is increasing. In the present work, a MPP able to accommodate wind turbines, wave energy converters, and aquaculture systems are considered. This work presents the first part (Part A) of the analyses of the dynamics of the floating support structure for this MPP, focusing on the rigid body dynamic response, while its complementary hydroelastic analysis is presented in Part B (OMAE2019-96282). The aim here is to assess the dynamic response of the platform with respect to the preliminary requirements imposed by the wind turbine, the aquaculture system, and the other ancillary systems. After describing the platform analyzed, and explaining the aero-hydro coupled model of dynamics approach adopted, two independent analyses are conducted, one using the SESAM package by DNV-GL, and another using ANSYS AQWA, in order to verify the results, in absence of experimental data. Considering a severe, but still operational, load case, the preliminary results seem to demonstrate that the chosen platform can satisfy the dynamics constraints imposed by the payload systems.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Coupled Dynamics of an Offshore Floating Multi-Purpose Platform: Part A — Rigid Body Analysis

Collu

Ruzzo

et al. 2019

Volume 6: Ocean Space Utilization

View full text Add to dashboard Cite

show abstract

“…Similar errors may exist for non-HSLC fits and may be a limitation of the Weibull fit itself. For example, long term Weibull fits were used in Bai et al (2018) to describe the fatigue accumulation in fish cages, which found that the fatigue life estimate of the Weibull fit was approximately 50% that of a fatigue life calculated using measured data. In this case the primary difference is that Bai et al (2018) yielded conservative results.…”

Section: Weibull Fit Comparisonmentioning

confidence: 99%

Fatigue Estimation on a High-Speed Wave Piercing Catamaran During Normal Operations

Warren

Ali-Lavroff

McVicar³

et al. 2022

IJME

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The estimation of fatigue life in the design process is particularly important for weight-optimised ships such as high-speed aluminium craft, but to date no research has been published on the fatigue accumulation on large wave-piercing catamarans, focusing on long-term operations. This paper assesses the applicability of classification society rules for high-speed catamarans with respect to fatigue design. This was achieved by comparing the long-term distributions of stress, measured on a 111m long wave-piercing catamaran ferry whilst operating in the Canary Islands and during the delivery voyage, with load spectra estimated using a method accepted by the classification society, DNV. The paper also proposes an improved distribution fitment method for fatigue analysis. A detailed method to convert measured stress histories in the time domain into an appropriate stress-spectrum and fitment of Weibull parameters is presented. Results show that the simplified method accepted by the classification society is highly conservative regarding fatigue estimation compared to fatigue results based on measured data. The proposed combined Weibull fitment method substantially improves the accuracy of simplified fatigue analysis methods.

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“… Dissolved Oxygen Water temperature, °C Salinity, psu Wave condition Significant wave height, m Direct impact on the structural integrity and stability of the structure by applying wave loads ( Wei et al, 2014 ). Also, causes fatigue in the structure ( Bai et al, 2018 , 2016 ). May cause buckling failure in floating collars ( Li et al, 2013 ; Fu and Moan, 2012 ; Huang et al, 2016a ; Jensen et al, 2007 ).…”

Section: Reliability Analysis Of the Integrated Systemmentioning

confidence: 99%

“… Sub-system/Assembly/Component Studied limit-states Description Ref Aquaculture Grid mooring system for net cage system Fatigue Direct integration by assuming a worst-case scenario: extreme-value event method ( Hou et al, 2019a , b ) Floating collar Tensile strength Buckling Fatigue Static, vibration and fatigue analysis of a Finite Element (FE) model. Estimating fatigue life from fatigue laws (S-N curves) (potentially non-linear HDPE fatigue and strength behaviour) ( Bai et al, 2018 ; Zhao et al, 2019a ; Liu et al, 2019a ) Mooring chains Ultimate strength First Order Reliability Method (FORM) for Time-dependent reliability assessment of mooring chains subjected to corrosion. ( Hou et al, 2017 ) Offshore Wind Turbine Foundation Fatigue Buckling Ultimate Strength Reliability analysis using two methods, Monte Carlo Simulation (MCS) with Latin Hypercube Sampling and FORM.…”

Section: Reliability Analysis Of the Integrated Systemmentioning

confidence: 99%

Reliability of multi-purpose offshore-facilities: Present status and future direction in Australia

Aryai

Abdussamie

Salehi

et al. 2021

Process Safety and Environmental Protection

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Sustainable use of the ocean for food and energy production is an emerging area of research in different countries around the world. This goal is pursued by the Australian aquaculture, offshore engineering and renewable energy industries, research organisations and the government through the “Blue Economy Cooperative Research Centre”. To address the challenges of offshore food and energy production, leveraging the benefits of co-location, vertical integration, infrastructure and shared services, will be enabled through the development of novel Multi-Purpose Offshore-Platforms (MPOP). The structural integrity of the designed systems when being deployed in the harsh offshore environment is one of the main challenges in developing the MPOPs. Employing structural reliability analysis methods for assessing the structural safety of the novel aquaculture-MPOPs comes with different limitations. This review aims at shedding light on these limitations and discusses the current status and future directions for structural reliability analysis of a novel aquaculture-MPOP considering Australia’s unique environment. To achieve this aim, challenges which exist at different stages of reliability assessment, from data collection and uncertainty quantification to load and structural modelling and reliability analysis implementation, are discussed. Furthermore, several solutions to these challenges are proposed based on the existing knowledge in other sectors, and particularly from the offshore oil and gas industry. Based on the identified gaps in the review process, potential areas for future research are introduced to enable a safer and more reliable operation of the MPOPs.

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Probabilistic analysis and fatigue life assessment of floating collar of fish cage due to random wave loads

Cited by 19 publications

References 36 publications

Analysis of the Coupled Dynamics of an Offshore Floating Multi-Purpose Platform: Part A — Rigid Body Analysis

Analysis of the Coupled Dynamics of an Offshore Floating Multi-Purpose Platform: Part A — Rigid Body Analysis

Fatigue Estimation on a High-Speed Wave Piercing Catamaran During Normal Operations

Reliability of multi-purpose offshore-facilities: Present status and future direction in Australia

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