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Papers by Fernando Abrahão

Research paper thumbnail of Experimentos computacionais com heurísticas de melhorias para o problema do caixeiro viajante

Research paper thumbnail of Aircraft routing problem model for fractional fleets using fault prognostics

Journal of Quality in Maintenance Engineering, Apr 30, 2021

PurposeThe objective of this work is to provide a novel aircraft allocation model for fractional ... more PurposeThe objective of this work is to provide a novel aircraft allocation model for fractional business aviation. This model may provide decision-makers with alternative routing solutions that take into consideration preventive maintenance and failure prognostics information. The expected results are more efficient routing solutions when compared to conventional planning models, to help decision-makers improve operations and maintenance planning.Design/methodology/approachThe model is a mixed integer linear problem formulation addressing and considering preventive maintenance and failure prognostics for optimal operations. Numerical experiments were performed using both field and synthetic data to validate the proposed method. All instances are solved using branch, price and cut algorithms from open-source software.FindingsThe results obtained in this study show that the use of failure prognostics information in aircraft routing can provide improvements in overall planning. By choosing slightly longer flight legs, the flight cost will increase, but putting an aircraft with a higher risk of failure on a leg inbound to a maintenance base can reduce maintenance and overall operating cost.Originality/valueThe model and method provide decision-makers with routing solutions that consider new aspects of planning, not used in previous works, such as failure. Most of the literature focuses on solving routing problems for large commercial airlines. Considering that, few solutions are found in literature for fractional business operators, which have their own operational particularities, such as a company managing a fleet of aircraft belonging to multiple shareowners. In such operation, clients may not always fly in the aircraft that they are shareowners, but an aircraft from the fractional fleet of the same category. Here, the company managing the aircraft guarantees that an aircraft will be ready to attend client demands in minimum time. One of the major differences from other models of operation is the dynamic nature of its flight demands, thus requiring flexible and agile planning limiting the available time to find a routing solution.

Research paper thumbnail of SIAD-AERO: A New Methodology for the Inspection of Energy Assets

This paper aims to present the SIAD-AERO Project. The Project has the objective to develop a semi... more This paper aims to present the SIAD-AERO Project. The Project has the objective to develop a semiautonomous system for energy assets inspection, capable to deploy embedded sensors in an aerial platform, to capture and process images in the visible, infrared and ultraviolet bands, detecting anomalies automatically and presenting an optimal plan of action. A better quality of service and operational efficiency were the premises guiding the project. The initial requirements for the system have been included and described, as well as a description of the designed system, which includes its four subsystems and its development methodology using Feature Driven Development (FDD). The achieved results are presented, discussing the paradigms broken during the project’s development.

Research paper thumbnail of Mro 4.0

Advances in civil and industrial engineering book series, 2020

The demand for increased efficiency of production processes, while maintaining quality and safety... more The demand for increased efficiency of production processes, while maintaining quality and safety in the operating environment, are permanent requirements of industrial revolutions. In the information age, data acquisition and its use to affect business strategies are being carried out by sensing production lines, tracking processes, and the product itself throughout its life cycle. Industry 4.0 requires an organizational transformation in terms of culture, process, and technology for the organization to be able to harness the potential of information. This chapter seeks to establish the difficulties and challenges of organizational transformation from the analysis of an aviation MRO company in light of integrated logistics support (ILS). The discussion will lead to the points to be taken into account from all elements of the ILS that will produce a roadmap for decision-makers to follow.

Research paper thumbnail of Effects of design for maintainability in complex aircraft systems

Research paper thumbnail of Fleet Maintenance Scheduling with an Ant Colony System Approach

Springer eBooks, 2006

The paper presents highlights of a doctoral research addressed to model and solve the problem of ... more The paper presents highlights of a doctoral research addressed to model and solve the problem of preventive maintenance scheduling of fleets of vehicles. The problem is formulated and several Ant Colony based approaches were proposed and tested considering different instances of the maintenance scheduling problem, including applications related to the preventive maintenance of an aircraft fleet belonging to the Brazilian

Research paper thumbnail of Optmization In Performance-Based Logistics Contracts

Performance-based Logistics (PBL) contracts require metrics and methodologies set... more Performance-based Logistics (PBL) contracts require metrics and methodologies set in a systemic way to provide readiness for the warfighter at reasonable costs. There must be a clever and verifiable connection of metrics in order to access and analyze data and to deliver sound and consistent inputs for the entire support system to accomplish its goals. A system of incentives and penalties usually takes place and suggests functions to be maximized and/or minimized in a multi-criterion and highly integrated environment. This study deals with the optimization of the entire setup of Performance-Based Logistics contracts and is limited to a preliminary study in a simple scenario that has showed a promises results. A mixed method, using both the Ɛ-Constraint and Goal Programming is proposed to model the case. Results indicate that metrics used for reliability, maintainability, availability and supportability (RAMS) and costs can be optimized simultaneously for clever contracts

Research paper thumbnail of A meta-heurística colônia de formigas para solução do problema de programação de manutenção preventiva de uma frota de veículos com múltiplas restrições: aplicação na Força Aérea Brasileira

Research paper thumbnail of Semantic voice search in IETP: filling the gap for maintenance 4.0

Journal of Quality in Maintenance Engineering

PurposeA framework is being developed to help Integrated Electronic Technical Publications (IETP)... more PurposeA framework is being developed to help Integrated Electronic Technical Publications (IETP) consultation inside and outside the aviation maintenance hangar. The expected results are the reduction in time to access the desired IETP and to assist mechanics while performing maintenance tasks using voice recognition.Design/methodology/approachThe work is being conducted based on literature review and consultation with mechanics from the aviation industry, through questionnaires. The development will be made through study cases by building a core search engine and mobile applications to support the mechanics during the maintenance activities.FindingsThe identified problem in small maintenance shops and defence organizations suggests that IETP are not entirely accessible before and during the maintenance activity. Such organizations suffer from information and communications technology (ICT) low infrastructure capability and demand access to multiple IETP databases as they usually s...

Research paper thumbnail of Evolução Do Risco Aviário No Brasil Entre 2006 e 2010: Estatísticas e Probabilidades

Conexao Sipaer, Jul 18, 2012

Research paper thumbnail of Optimization in performance-based logistics contracts

2017 IEEE International Workshop on Metrology for AeroSpace (MetroAeroSpace), 2017

Performance-based Logistics (PBL) contracts require metrics and methodologies set in a systemic w... more Performance-based Logistics (PBL) contracts require metrics and methodologies set in a systemic way to provide readiness for the warfighter at reasonable costs. There must be a clever and verifiable connection of metrics in order to access and analyze data and to deliver sound and consistent inputs for the entire support system to accomplish its goals. A system of incentives and penalties usually takes place and suggests functions to be maximized and/or minimized in a multi-criterion and highly integrated environment. This study deals with the optimization of the entire setup of Performance-Based Logistics contracts and is limited to a preliminary study in a simple scenario that has showed a promises results. A mixed method, using both the £-Constraint and Goal Programming is proposed to model the case. Results indicate that metrics used for reliability, maintainability, availability and supportability (RAMS) and costs can be optimized simultaneously for clever contracts.

Research paper thumbnail of An Operational Availability Optimization Model Based on the Integration of Predictive and Scheduled Maintenance

Health monitoring technologies and data analytics are increasingly widespread in the aviation ind... more Health monitoring technologies and data analytics are increasingly widespread in the aviation industry following the growth in the capacity and speed of abundant and accurate data generation and transmission from the aircraft systems. These advances are fueling a change process in aircraft maintenance strategy towards a more proactive, precise, and effective approach consolidated in the concepts of Integrated Vehicle Health Monitoring (IVHM) and Prognostics and Health Management (PHM). Following that, several model-based and data-driven prognostics methods for Remaining Useful Life (RUL) estimation have been developed in the pursuit of improving predictive maintenance interventions for different types of components. Recent papers showcased the significant challenges faced to achieve forecast accuracy as posed by the inherent uncertainty involved in the functional dynamics of complex systems. This work acknowledges these difficulties and tackles variability by embracing it in the met...

Research paper thumbnail of Mro 4.0

Advances in Civil and Industrial Engineering

The demand for increased efficiency of production processes, while maintaining quality and safety... more The demand for increased efficiency of production processes, while maintaining quality and safety in the operating environment, are permanent requirements of industrial revolutions. In the information age, data acquisition and its use to affect business strategies are being carried out by sensing production lines, tracking processes, and the product itself throughout its life cycle. Industry 4.0 requires an organizational transformation in terms of culture, process, and technology for the organization to be able to harness the potential of information. This chapter seeks to establish the difficulties and challenges of organizational transformation from the analysis of an aviation MRO company in light of integrated logistics support (ILS). The discussion will lead to the points to be taken into account from all elements of the ILS that will produce a roadmap for decision-makers to follow.

Research paper thumbnail of A Study on Maintenance Task Interval Optimization by Metaheuristics

Simpósio de Pesquisa Operacional e Logística da Marinha - Publicação Online

Research paper thumbnail of Development of the Aerologlabtool

Simpósio de Pesquisa Operacional e Logística da Marinha - Publicação Online

Research paper thumbnail of Effects of design for maintainability in complex aircraft systems

Procceedings of the 24th ABCM International Congress of Mechanical Engineering

Research paper thumbnail of Fleet Maintenance Scheduling with an Ant Colony System Approach

Lecture Notes in Computer Science, 2006

The paper presents highlights of a doctoral research addressed to model and solve the problem of ... more The paper presents highlights of a doctoral research addressed to model and solve the problem of preventive maintenance scheduling of fleets of vehicles. The problem is formulated and several Ant Colony based approaches were proposed and tested considering different instances of the maintenance scheduling problem, including applications related to the preventive maintenance of an aircraft fleet belonging to the Brazilian

Research paper thumbnail of Experimentos computacionais com heurísticas de melhorias para o problema do caixeiro viajante

Research paper thumbnail of Aircraft routing problem model for fractional fleets using fault prognostics

Journal of Quality in Maintenance Engineering, Apr 30, 2021

PurposeThe objective of this work is to provide a novel aircraft allocation model for fractional ... more PurposeThe objective of this work is to provide a novel aircraft allocation model for fractional business aviation. This model may provide decision-makers with alternative routing solutions that take into consideration preventive maintenance and failure prognostics information. The expected results are more efficient routing solutions when compared to conventional planning models, to help decision-makers improve operations and maintenance planning.Design/methodology/approachThe model is a mixed integer linear problem formulation addressing and considering preventive maintenance and failure prognostics for optimal operations. Numerical experiments were performed using both field and synthetic data to validate the proposed method. All instances are solved using branch, price and cut algorithms from open-source software.FindingsThe results obtained in this study show that the use of failure prognostics information in aircraft routing can provide improvements in overall planning. By choosing slightly longer flight legs, the flight cost will increase, but putting an aircraft with a higher risk of failure on a leg inbound to a maintenance base can reduce maintenance and overall operating cost.Originality/valueThe model and method provide decision-makers with routing solutions that consider new aspects of planning, not used in previous works, such as failure. Most of the literature focuses on solving routing problems for large commercial airlines. Considering that, few solutions are found in literature for fractional business operators, which have their own operational particularities, such as a company managing a fleet of aircraft belonging to multiple shareowners. In such operation, clients may not always fly in the aircraft that they are shareowners, but an aircraft from the fractional fleet of the same category. Here, the company managing the aircraft guarantees that an aircraft will be ready to attend client demands in minimum time. One of the major differences from other models of operation is the dynamic nature of its flight demands, thus requiring flexible and agile planning limiting the available time to find a routing solution.

Research paper thumbnail of SIAD-AERO: A New Methodology for the Inspection of Energy Assets

This paper aims to present the SIAD-AERO Project. The Project has the objective to develop a semi... more This paper aims to present the SIAD-AERO Project. The Project has the objective to develop a semiautonomous system for energy assets inspection, capable to deploy embedded sensors in an aerial platform, to capture and process images in the visible, infrared and ultraviolet bands, detecting anomalies automatically and presenting an optimal plan of action. A better quality of service and operational efficiency were the premises guiding the project. The initial requirements for the system have been included and described, as well as a description of the designed system, which includes its four subsystems and its development methodology using Feature Driven Development (FDD). The achieved results are presented, discussing the paradigms broken during the project’s development.

Research paper thumbnail of Mro 4.0

Advances in civil and industrial engineering book series, 2020

The demand for increased efficiency of production processes, while maintaining quality and safety... more The demand for increased efficiency of production processes, while maintaining quality and safety in the operating environment, are permanent requirements of industrial revolutions. In the information age, data acquisition and its use to affect business strategies are being carried out by sensing production lines, tracking processes, and the product itself throughout its life cycle. Industry 4.0 requires an organizational transformation in terms of culture, process, and technology for the organization to be able to harness the potential of information. This chapter seeks to establish the difficulties and challenges of organizational transformation from the analysis of an aviation MRO company in light of integrated logistics support (ILS). The discussion will lead to the points to be taken into account from all elements of the ILS that will produce a roadmap for decision-makers to follow.

Research paper thumbnail of Effects of design for maintainability in complex aircraft systems

Research paper thumbnail of Fleet Maintenance Scheduling with an Ant Colony System Approach

Springer eBooks, 2006

The paper presents highlights of a doctoral research addressed to model and solve the problem of ... more The paper presents highlights of a doctoral research addressed to model and solve the problem of preventive maintenance scheduling of fleets of vehicles. The problem is formulated and several Ant Colony based approaches were proposed and tested considering different instances of the maintenance scheduling problem, including applications related to the preventive maintenance of an aircraft fleet belonging to the Brazilian

Research paper thumbnail of Optmization In Performance-Based Logistics Contracts

Performance-based Logistics (PBL) contracts require metrics and methodologies set... more Performance-based Logistics (PBL) contracts require metrics and methodologies set in a systemic way to provide readiness for the warfighter at reasonable costs. There must be a clever and verifiable connection of metrics in order to access and analyze data and to deliver sound and consistent inputs for the entire support system to accomplish its goals. A system of incentives and penalties usually takes place and suggests functions to be maximized and/or minimized in a multi-criterion and highly integrated environment. This study deals with the optimization of the entire setup of Performance-Based Logistics contracts and is limited to a preliminary study in a simple scenario that has showed a promises results. A mixed method, using both the Ɛ-Constraint and Goal Programming is proposed to model the case. Results indicate that metrics used for reliability, maintainability, availability and supportability (RAMS) and costs can be optimized simultaneously for clever contracts

Research paper thumbnail of A meta-heurística colônia de formigas para solução do problema de programação de manutenção preventiva de uma frota de veículos com múltiplas restrições: aplicação na Força Aérea Brasileira

Research paper thumbnail of Semantic voice search in IETP: filling the gap for maintenance 4.0

Journal of Quality in Maintenance Engineering

PurposeA framework is being developed to help Integrated Electronic Technical Publications (IETP)... more PurposeA framework is being developed to help Integrated Electronic Technical Publications (IETP) consultation inside and outside the aviation maintenance hangar. The expected results are the reduction in time to access the desired IETP and to assist mechanics while performing maintenance tasks using voice recognition.Design/methodology/approachThe work is being conducted based on literature review and consultation with mechanics from the aviation industry, through questionnaires. The development will be made through study cases by building a core search engine and mobile applications to support the mechanics during the maintenance activities.FindingsThe identified problem in small maintenance shops and defence organizations suggests that IETP are not entirely accessible before and during the maintenance activity. Such organizations suffer from information and communications technology (ICT) low infrastructure capability and demand access to multiple IETP databases as they usually s...

Research paper thumbnail of Evolução Do Risco Aviário No Brasil Entre 2006 e 2010: Estatísticas e Probabilidades

Conexao Sipaer, Jul 18, 2012

Research paper thumbnail of Optimization in performance-based logistics contracts

2017 IEEE International Workshop on Metrology for AeroSpace (MetroAeroSpace), 2017

Performance-based Logistics (PBL) contracts require metrics and methodologies set in a systemic w... more Performance-based Logistics (PBL) contracts require metrics and methodologies set in a systemic way to provide readiness for the warfighter at reasonable costs. There must be a clever and verifiable connection of metrics in order to access and analyze data and to deliver sound and consistent inputs for the entire support system to accomplish its goals. A system of incentives and penalties usually takes place and suggests functions to be maximized and/or minimized in a multi-criterion and highly integrated environment. This study deals with the optimization of the entire setup of Performance-Based Logistics contracts and is limited to a preliminary study in a simple scenario that has showed a promises results. A mixed method, using both the £-Constraint and Goal Programming is proposed to model the case. Results indicate that metrics used for reliability, maintainability, availability and supportability (RAMS) and costs can be optimized simultaneously for clever contracts.

Research paper thumbnail of An Operational Availability Optimization Model Based on the Integration of Predictive and Scheduled Maintenance

Health monitoring technologies and data analytics are increasingly widespread in the aviation ind... more Health monitoring technologies and data analytics are increasingly widespread in the aviation industry following the growth in the capacity and speed of abundant and accurate data generation and transmission from the aircraft systems. These advances are fueling a change process in aircraft maintenance strategy towards a more proactive, precise, and effective approach consolidated in the concepts of Integrated Vehicle Health Monitoring (IVHM) and Prognostics and Health Management (PHM). Following that, several model-based and data-driven prognostics methods for Remaining Useful Life (RUL) estimation have been developed in the pursuit of improving predictive maintenance interventions for different types of components. Recent papers showcased the significant challenges faced to achieve forecast accuracy as posed by the inherent uncertainty involved in the functional dynamics of complex systems. This work acknowledges these difficulties and tackles variability by embracing it in the met...

Research paper thumbnail of Mro 4.0

Advances in Civil and Industrial Engineering

The demand for increased efficiency of production processes, while maintaining quality and safety... more The demand for increased efficiency of production processes, while maintaining quality and safety in the operating environment, are permanent requirements of industrial revolutions. In the information age, data acquisition and its use to affect business strategies are being carried out by sensing production lines, tracking processes, and the product itself throughout its life cycle. Industry 4.0 requires an organizational transformation in terms of culture, process, and technology for the organization to be able to harness the potential of information. This chapter seeks to establish the difficulties and challenges of organizational transformation from the analysis of an aviation MRO company in light of integrated logistics support (ILS). The discussion will lead to the points to be taken into account from all elements of the ILS that will produce a roadmap for decision-makers to follow.

Research paper thumbnail of A Study on Maintenance Task Interval Optimization by Metaheuristics

Simpósio de Pesquisa Operacional e Logística da Marinha - Publicação Online

Research paper thumbnail of Development of the Aerologlabtool

Simpósio de Pesquisa Operacional e Logística da Marinha - Publicação Online

Research paper thumbnail of Effects of design for maintainability in complex aircraft systems

Procceedings of the 24th ABCM International Congress of Mechanical Engineering

Research paper thumbnail of Fleet Maintenance Scheduling with an Ant Colony System Approach

Lecture Notes in Computer Science, 2006

The paper presents highlights of a doctoral research addressed to model and solve the problem of ... more The paper presents highlights of a doctoral research addressed to model and solve the problem of preventive maintenance scheduling of fleets of vehicles. The problem is formulated and several Ant Colony based approaches were proposed and tested considering different instances of the maintenance scheduling problem, including applications related to the preventive maintenance of an aircraft fleet belonging to the Brazilian