Browsing NTNU Open by Author "Barros, Anne"
Now showing items 1-20 of 49
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A Degrading Element of Safety-instrumented Systems with Combined Maintenance Strategy
Zhang, Aibo; Liu, Yiliu; Barros, Anne; Kassa, Elias (Chapter, 2019)Safety-instrumented systems (SISs) are widely used to prevent hazardous events. The mechanical actuator subsystem in a SIS can become more vulnerable with time due to progressive degradation mechanisms, such as erosion, ... -
A dynamic Bayesian network approach for prognosis computations on discrete state systems
Foulliaron, Josquin; Bouillaut, Laurent; Aknin, Patrice; Barros, Anne (Journal article, 2017)The maintenance optimization of complex systems is a key question. One important objective is to be able to anticipate future maintenance actions required to optimize the logistic and future investments. That is why, over ... -
A modelling methodology for the assessment of preventive maintenance on a compressor drive system
Zhang, Yun; Barros, Anne; Rauzy, Antoine; Lunde, Erling (Chapter, 2018)Huge rotary machines are commonly used in oil and gas processing plants for separation, compression and boosting. Their reliability is of high importance to avoid operation downtime and production loss. In this paper, we ... -
A Study on the Impacts of Maintenance Duration on Dynamic Grouping Modeling and Optimization of Multicomponent Systems
Vu Hai, Canh; Do Van, Phuc; Barros, Anne (Journal article; Peer reviewed, 2018)In the framework of maintenance optimization of multicomponent systems, dynamic grouping maintenance based on rolling horizon has developed and became an interesting approach. However, most existing dynamic grouping models ... -
An Extension Graphical Duration Models Integrating Conditional Sojourn Time Distributions
Foulliaron, Josquin; Bouillaut, Laurent; Aknin, Patrice; Barros, Anne (Journal article; Peer reviewed, 2017)System degradation modelling is a key problem when performing any type of reliability study. It is used to determine the quality of the computed reliability indicators and prognostic estimates. However, the mathematical ... -
Analysis of Vibration Data and Investigation of Models to Support Maintenance Decision of Rotating Components
Tajiani, Bahareh (Doctoral theses at NTNU;2024:5, Doctoral thesis, 2024)This PhD project focuses on analysis of vibration data and investigation of mathematical models to support maintenance decision of rotating components and more specifically roller bearings. The PhD work generally consists ... -
Condition Monitoring and Prognosis for Subsea Multiphase Pump
Liu, Fenfen (Master thesis, 2015)This thesis presents a case study about the condition monitoring of the twin-screw multiphase pump in the subsea field to demonstrate how condition monitoring techniques can be applied for subsea equipment. Firstly a FMECA ... -
Condition-Based Maintenance Models: Application to Subsea Safety Systems
Zhang, Yun (Doctoral theses at NTNU;2018:375, Doctoral thesis, 2018)This PhD thesis clarifies concepts and challenges in maintenance modelling for subsea systems. The main objective is to develop suitable condition-based maintenance (CBM) models for some typical safety systems in subsea. ... -
Degradation Modelling for Predictive Maintenance - An Application to High Voltage Rotary Machines
Islam, Abu Md Ariful (Master thesis, 2017)Large high voltage rotary machines are commonly utilized in gas processing plants for operations such as dewatering and compression. The availability of these machines are very critical as the operation down times are ... -
Evaluation of the warranty cost of a product with type III stochastic dependence between components
Zhang, Nan; Fouladirad, Mitra; Barros, Anne (Journal article; Peer reviewed, 2018)This paper analyses respectively the expected warranty costs from the perspectives of the manufacturer and the consumer. For a two-component series system with stochastic dependence between components, both the non-renewing ... -
Hybrid Modelling for Dynamic Reliability Assessments in Subsea Oil and Gas Processing Systems
Arismendi Torres, Renny Jose (Master thesis, 2017)Traditional reliability methods such as fault tree analysis and reliability block diagrams were not designed to account for the complex dynamic behavior of most industrial systems. These traditional reliability methods ... -
Imperfect Testing and its Influence on Availability of Safety Instrumented Systems
Sachdeva, Shipra (Master thesis, 2015)Imperfect testing of SIS, its types, definitions and models that take in account its contribution to average unavailability of the system. -
Implementing IEC 61508 for Qualification of Safety-Instrumented Systems for Submergible Tube Bridges
Olsen, Ole-Henrik Dag (Master thesis, 2016)Qualification of new technology (or systems) has become an important discipline within application areas that have strict requirements to safety and/or reliability, and where new technology is not adequately covered by ... -
Integration of prognostics and control of an oil/CO2 subsea separation system
Bernardino, Lucas Ferreira; de Souza, André Felipe Ferreira; Secchi, Argimiro Resende; Bezerra, Maurício; Barros, Anne (Journal article, 2020) -
Introduction of degradation modeling in qualification of the novel subsea technology
Srivastav, Himanshu; Lundteigen, Mary Ann; Barros, Anne (Journal article; Peer reviewed, 2021)All-electric systems are the novel subsea technology that is an upgrade of widely deployed electro-hydraulic control systems. They promised more reliable equipment and a safer environment. An all-electric production system ... -
Inventory Management and Procurement Procedures for Spare Parts
Filip, Eduard (Master thesis, 2018)Financial implications are what drives attention to optimizing spare parts inventories. After all, with an infinite supply of money, companies could stock as many parts as they desire. However, the modern business environment ... -
Joint maintenance and controller reconfiguration policy for a gradually deteriorating control system
Langeron, Yves; Grall, Antoine; Barros, Anne (Journal article, 2017)This paper tackles the maintenance decision-making of gradually deteriorating control systems. The main feature of these systems is their ability within a closed-loop to drive actuators in order to set the controlled process ... -
Maintenance analysis of a two-component load-sharing system
Zhang, Nan; Fouladirad, Mitra; Barros, Anne (Journal article, 2017)This paper presents a two-component load-sharing system. The failure rates of the two components are time dependent and load dependent. Whenever one fails, it is imperfectly repaired with a time delay during which the ... -
MAINTENANCE STRATEGIES IN CIVIL ENGINEERING - OVERVIEW AND APPLICATION IN FERRY FREE E39
Amiri, Razieh (Master thesis, 2016)This report focuses on the maintenance activities in civil engineering considering the used case Bjørnafjorden as a part of Ferry Free E39 project. Civil engineering is one of the oldest sectors in engineering, and its ... -
Optimal imperfect maintenance cost analysis of a two-component system with failure interactions
Zhang, Nan; Fouladirad, Mitra; Barros, Anne (Journal article; Peer reviewed, 2018)This paper considers a two-component system with failure interactions. Component 1 is repairable and component 2 is non repairable and is subject to an increasing degradation. One considers two different shock models. In ...