scholarly journals Quantifying uncertainties for Risk-Based Inspection planning using in-service Hull Structure Monitoring of FPSO hulls

2022 ◽  
Vol 81 ◽  
pp. 103100
Author(s):  
R.B. Hageman ◽  
F.H. van der Meulen ◽  
A. Rouhan ◽  
M.L. Kaminski
Keyword(s):  
Inspection Planning ◽  
Hull Structure ◽  
Structure Monitoring

Hull Structure Monitoring Using Inertial Measurement Units

2017 ◽  
Vol 17 (9) ◽  
pp. 2676-2681 ◽  
Author(s):  
Xianglu Ma ◽  
Shiqiao Qin ◽  
Xingshu Wang ◽  
Wei Wu ◽  
Jiaxing Zheng ◽  
...  
Keyword(s):  
Inertial Measurement Units ◽  
Inertial Measurement ◽  
Hull Structure ◽  
Structure Monitoring ◽  
Measurement Units

Ship hull structure monitoring using fibre optic sensors

2001 ◽  
Vol 10 (3) ◽  
pp. 472-478 ◽  
Author(s):  
G Wang ◽  
K Pran ◽  
G Sagvolden ◽  
G B Havsgård ◽  
A E Jensen ◽  
...  
Keyword(s):  
Ship Hull ◽  
Fibre Optic ◽  
Hull Structure ◽  
Structure Monitoring

Structural Reliability Applications in Design and Maintenance Planning of Ships Subjected to Fatigue and Corrosion

2012 ◽  
Author(s):  
Marcos Corrêa Câmara ◽  
Júlio C. Ramalho Cyrino
Keyword(s):  
Reliability Index ◽  
Structural Reliability ◽  
Time Dependent ◽  
Maintenance Planning ◽  
Inspection Planning ◽  
Utilization Factor ◽  
Hull Girder ◽  
Target Reliability Index ◽  
Hull Structure ◽  
Reliability Method

This paper presents structural reliability applications in design and maintenance planning for ships hull structures. For the assessment of structural strength, the model developed consists in an ultimate limit-state of hull-girder considering degradation by corrosion based in a statistical investigation of time-variant hull girder strength made by ABS (American Bureau of Shipping) on 2007. The time dependent reliability index obtained with the minimum elastic section modulus required by the rules of the classification society American Bureau of shipping (ABS), of two ship designs are compared against the results obtained from the target reliability index based design. The target reliability index assessment for corroded hulls is also showed. The monte-carlo simulation reliability method is used to calculate the time-dependent reliability of the primary hull structure. Two approaches of fatigue and corrosion-enhanced fatigue time dependent reliability are developed. A long term stress range applied to a detail is fitted to a weibull distribution based in a known design life. A utilization factor is introduced in order to consider the fraction of time at sea. A risk-based inspection planning is discussed for commercial and naval vessels Both S-N curve and fracture mechanics based reliability methods are used and the results are compared. An example of reliability updating after a inspection result is showed.

Probabilistic Inspection Planning of the Åsgard A FPSO Hull Structure With Respect to Fatigue

2000 ◽  
Vol 122 (2) ◽  
pp. 134-140 ◽  
Author(s):  
Inge Lotsberg ◽  
Gudfinnur Sigurdsson ◽  
Per Terje Wold
Keyword(s):  
Fatigue Life ◽  
Hot Spot ◽  
Fatigue Cracks ◽  
Probabilistic Methods ◽  
Production Unit ◽  
Inspection Planning ◽  
Hull Structure ◽  
Service Inspection

Probabilistic methods has been used to develop a basis for an in-service inspection program for the A˚sgard A FPSO hull structure with respect to fatigue cracks. A˚sgard A is a floating production unit constructed for Statoil and was installed on the A˚sgard Field during the winter 1999. Hot spot areas showing the shortest calculated fatigue lives have been selected for probabilistic analyses. This implies areas at doubling plates and transverse stiffeners in the deck structure and the connections between the side longitudinals and the transverse frames. In FPSOs, there are a number of details with similar geometry that also are fabricated in the same way. Some of the details like those in the deck structure are also subjected to the same magnitude of loading. Consequently, there will be correlation in fatigue life when several components are considered at the same time. The effect of this correlation has been investigated for components that have a welded surface and components that are ground. A number of analyses have been performed to investigate the effect of this correlation on required amount of in-service inspection. And it is shown how results from these analyses are transferred into an in-service inspection program for the A˚sgard A FPSO. [S0892-7219(00)00302-2]

Silicon Tetrachloride Synthesis from Rice Hulls: Transmission and Scanning Electron Microscope Study

1972 ◽  
Vol 30 ◽  
pp. 236-237 ◽  
Author(s):  
Richard S. Thomas ◽  
Prabir K. Basu ◽  
Francis T. Jones
Keyword(s):  
Silicon Tetrachloride ◽  
Silica Sand ◽  
Mineral Matter ◽  
Chemical Heterogeneity ◽  
Scanning Electron Microscope Study ◽  
Rice Hulls ◽  
Hull Structure ◽  
Lower Temperature ◽  
Image Position ◽  
Disposal Problem

Silicon tetrachloride, used in industry for the production of highest purity silicon and silica, is customarily manufactured from silica-sand and charcoal.SiCl4 can also be made from rice hulls, which contain up to 20 percent silica and only traces of other mineral matter. Hulls, after carbonization, actually prove superior as a starting material since they react at lower temperature. This use of rice hulls may offer a new, profitable solution for a rice mill byproduct disposal problem.In studies of the reaction kinetics with carbonized hulls, conversion of SiO2 to SiCl4 was found to proceed within a few minutes to a constant, limited yield which depended reproducibly on the ambient temperature of the reactor. See Fig. 1. This suggested that physical or chemical heterogeneity of the silica in the hull structure might be involved.

scholarly journals Solving the Problems of Inspection Planning under Parametric Uncertainty of Underlying Models

2013 ◽  
Vol 46 (9) ◽  
pp. 489-494
Author(s):  
Nicholas A. Nechval ◽  
Konstantin N. Nechval ◽  
Maris Purgailis ◽  
Uldis Rozevskis ◽  
Vadim Danovich ◽  
...  
Keyword(s):  
Parametric Uncertainty ◽  
Inspection Planning

scholarly journals Inspection planning by defect prediction models and inspection strategy maps

2021 ◽  
Author(s):  
Elisa Verna ◽  
Gianfranco Genta ◽  
Maurizio Galetto ◽  
Fiorenzo Franceschini
Keyword(s):  
Probabilistic Models ◽  
Prediction Models ◽  
Design Tool ◽  
General Interest ◽  
Manufacturing Processes ◽  
Analysis Tool ◽  
Manufacturing Companies ◽  
Inspection Planning ◽  
Inspection Strategy ◽  
Defect Prediction Models

AbstractDesigning appropriate quality-inspections in manufacturing processes has always been a challenge to maintain competitiveness in the market. Recent studies have been focused on the design of appropriate in-process inspection strategies for assembly processes based on probabilistic models. Despite this general interest, a practical tool allowing for the assessment of the adequacy of alternative inspection strategies is still lacking. This paper proposes a general framework to assess the effectiveness and cost of inspection strategies. In detail, defect probabilities obtained by prediction models and inspection variables are combined to define a pair of indicators for developing an inspection strategy map. Such a map acts as an analysis tool, enabling positioning assessment and benchmarking of the strategies adopted by manufacturing companies, but also as a design tool to achieve the desired targets. The approach can assist designers of manufacturing processes, and particularly low-volume productions, in the early stages of inspection planning.

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