Paulo Cesar Ribas

• Polami, Komeyl Baghizadeh; Pahl, Julia & Ribas, Paulo Cesar (2026). Data-Driven Fuel Consumption Analysis for Maintenance Operations in Offshore Wind Farms. In Armas, Jesica de & Ruiz, Eduardo Lalla (Ed.), Logistics and Maritime Systems: 14th International Conference, LOGMS 2026, held in conjunction with EUROMar 2026, Barcelona, Spain, July 7–10, 2026, Proceedings. Springer. ISSN 9783032307958. p. 143–155. doi: 10.1007/978-3-032-30795-8_13. Full text in Research Archive Show summary

  This study presents a data-driven analysis of fuel consumption in offshore wind farm (OWF) maintenance operations using high-frequency engine logs, navigation records, met-ocean data, and operator-reported activity logs from a service offshore vessel (SOV). The results show that transit-related activities account for nearly three-quarters of total mission fuel consumption. Based on this finding, predictive modeling is focused on transit operations, where the greatest potential for fuel and emission reduction exists. Among the evaluated models, Random Forest (RF) achieved the best performance, with an R2 of 0.857, MAE of 3.412 L/h, and RMSE of 8.917 L/h on unseen test data. Feature importance analysis shows that vessel speed is the dominant predictor, followed by wave-related variables. These findings indicate that weather-aware routing and speed selection can support lower fuel use, CO2 emissions, and maintenance costs in OWF logistics.

• Logsdon, Lucia Balsemão Furtado; Filho, Virgilio José Martins Ferreira & Ribas, Paulo Cesar (2025). Optimization models and heuristics for effective pipeline decommissioning planning in the oil and gas industry. Computers and Chemical Engineering. ISSN 0098-1354. 197. doi: 10.1016/j.compchemeng.2025.109044. Full text in Research Archive
• Vianna, Igor Girão Peres; Ribas, Paulo Cesar; Ferreira, Virgílio José Martins & Gribkovskaia, Irina (2025). Analysis of Fleet Management Policies for Offshore Platform Supply Vessels: The Brazilian Case. Journal of Marine Science and Engineering (JMSE). 13(4). doi: 10.3390/jmse13040686. Full text in Research Archive Show summary

  Offshore oil and gas activities are crucial in the petroleum industry. Offshore oil and gas installations require different cargo to operate. A heterogeneous fleet of platform supply vessels (PSVs) transports cargo supply to installations. The PSV fleet management in Brazil faces challenges such as the non-availability of the spot market, variations and uncertainties in delivery order demands and due dates, inspection and corrective vessel maintenance, and multiple time windows for service at installations. PSV fleet management aims to satisfy cargo delivery requests in time and quantity, avoid delays, and achieve a balance among delivery service levels, vessel costs, and greenhouse gas emissions. We develop several PSV fleet management policies with delivery service level or fuel consumption goals, composed of new fleet management procedures such as vessel control, vessel assignment to voyages including cargo selection, vessel routing, speed selection, and dynamic re-routing. The results of tests on a real Brazilian case demonstrate that the developed policies with the incorporated fleet management procedures improve fleet performance indicators. The comparative analysis of policies shows their different impacts on indicators, allowing managers to select the best fleet management policy by considering the trade-offs between delivery service level, costs, and emissions, depending on their goals.

• Xue, Manru & Ribas, Paulo Cesar (2024). Short-term scheduling of support vessels in wind farm maintenance. In Pong, Philip WT (Eds.), Renewable energy resources and conservation. Springer. ISSN 9783031590047. p. 93–100. doi: 10.1007/978-3-031-59005-4_11. Full text in Research Archive
• Vega, Jonathan De La; Santana, mateus; Pureza, Vitoria; Morabito, reinaldo; Ribas, Paulo Cesar & Bastos, Yan (2022). Model‐based solution approach for a short‐term flight rescheduling problem in aerial passenger transportation to maritime units. International Transactions in Operational Research. ISSN 0969-6016. doi: 10.1111/itor.13079. Full text in Research Archive
• Vega, Jonathan De La; Vieira, Thiago; Santana, mateus; Pureza, Vitoria; Morabito, reinaldo & tavares, roberto [Show all 8 contributors for this article] (2022). Helicopter recovery in an oil and gas industry: Model and solution approaches. EURO Journal on Transportation and Logistics. ISSN 2192-4376. doi: 10.1016/j.ejtl.2022.100084. Full text in Research Archive
• Vieira, Thiago; Vega, Jonathan De La; tavares, roberto; munari, Pedro; Morabito, Reinaldo & Bastos, Yan [Show all 7 contributors for this article] (2021). Exact and heuristic approaches to reschedule helicopter flights for personnel transportation in the oil industry. Transportation Research Part E: Logistics and Transportation Review. ISSN 1366-5545. doi: 10.1016/j.tre.2021.102322. Full text in Research Archive
• Bittencourt, Gustavo Cunha de; Chagas, Rennan Danilo Seimetz; silva, Victor anselmo; Igor, Girao Peres Vianna; Longhi, Rafael Pedro & Filho, Virgilio Jose Martins Ferreira [Show all 7 contributors for this article] (2021). A solution framework for the integrated problem of cargo assignment, fleet sizing, and delivery planning in offshore logistics. Computers & industrial engineering. ISSN 0360-8352. doi: 10.1016/j.cie.2021.107653. Full text in Research Archive
• yamashita, denise; Silva, Bruno; Morabito, Reinaldo & Ribas, Paulo Cesar (2019). A multi-start heuristic for the ship routing and scheduling of an oil company. Computers & industrial engineering. ISSN 0360-8352. doi: 10.1016/j.cie.2019.07.039. Full text in Research Archive
• Stanzani, Amélia de Lorena; Pureza, Vitoria; Morabito, Reinaldo; Silva, Bruno; yamashita, denise & Ribas, Paulo Cesar (2018). Optimizing multiship routing and scheduling with constraints on inventory levels in a Brazilian oil company. International Transactions in Operational Research. ISSN 0969-6016. doi: 10.1111/itor.12478. Full text in Research Archive
• rodrigues, vinicius; Morabito, Reinaldo; yamashita, denise; Silva, Bruno & Ribas, Paulo Cesar (2017). Ship Routing with Pickup and Delivery for a Maritime Oil Transportation System: MIP Model and Heuristics. Systems. doi: 10.3390/systems4030031. Full text in Research Archive
• Fabro, Joao; Stebel, Sergio Luiz; Rossato, Daniel; Polli, Helton; Arruda, Lucia Valeria Ramos & Neves, Flavio [Show all 9 contributors for this article] (2014). A MILP (Mixed Integer Linear Programming) decomposition solution to the scheduling of heavy oil derivatives in a real-world pipeline. Computers and Chemical Engineering. ISSN 0098-1354. doi: 10.1016/j.compchemeng.2014.01.004. Full text in Research Archive
• Ribas, Paulo Cesar; Yamamoto, Lia; Polli, Helton; Arruda, Lucia Valeria Ramos & Neves, Flavio (2013). A micro-genetic algorithm for multi-objective scheduling of a real world pipeline network. Engineering Applications of Artificial Intelligence. ISSN 0952-1976. doi: 10.1016/j.engappai.2012.09.020. Full text in Research Archive
• Boschetto, Suelen Neves; Neves, Flavio; Brondani, Willian; Magatao, Leandro; Arruda, lucia Valeria ramos & Ribas, Paulo Cesar (2009). A combined approach for operational scheduling of a real-world pipeline network. Computer-aided chemical engineering. ISSN 1570-7946. doi: 10.1016/S1570-7946(09)70324-4. Full text in Research Archive
• Boschetto, Suelen Neves; Felizari, Luiz Carlos; Yamamoto, Lia; Magatao, Leandro; Stebel, Sergio Luiz & Neves, Flavio [Show all 8 contributors for this article] (2008). An integrated framework for operational scheduling of a real-world pipeline network. Computer-aided chemical engineering. ISSN 1570-7946. doi: 10.1016/S1570-7946(08)80048-X. Full text in Research Archive
• Ribas, Paulo Cesar & Vieira, Guilherme Ernani (2008). Fractional factorial analysis to the configuration of simulated annealing applied to the multi-objective optimization of master production scheduling problems. International Journal of Production Research. ISSN 0020-7543. doi: 10.1080/00207540601080472. Full text in Research Archive
• Neves, Flavio; Magatao, Leandro; Stebel, Sergio Luiz; Boschetto, Suelen Neves; Felizari, Luiz Carlos & Czaikowski, daniel irineu [Show all 8 contributors for this article] (2007). An efficient approach to the operational scheduling of a real-world pipeline network. Computer-aided chemical engineering. ISSN 1570-7946. doi: 10.1016/S1570-7946(07)80139-8. Full text in Research Archive
• Ribas, Paulo Cesar & vieira, guilherme ernani (2004). A new multi-objective optimization method for master production scheduling problems using simulated annealing. International Journal of Production Research. ISSN 0020-7543. doi: 10.1080/00207540410001733869. Full text in Research Archive

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• Ribas, Paulo Cesar (2026). Crew Transfer Vessels Routing for Offshore Wind Farm Maintenance: Impacts of Electric Vessel Charging Consideration. Full text in Research Archive
• Igor, Girao Peres Vianna; Ribas, Paulo Cesar; Gribkovskaia, Irina & Filho, Virgilio Jose Martins Ferreira (2021). Multi-objective optimization approach for operational supply vessel planning. Full text in Research Archive
• Blattmann, Maren Emily & Ribas, Paulo Cesar (2025). From oil and gas to offshore wind: Assessing Norway’s logistical readiness and strategic landscape in the energy transition. Høgskolen i Molde - Vitenskapelig høgskole i logistikk. Full text in Research Archive
• Arumugam, Varun & Ribas, Paulo Cesar (2025). Evaluating hybrid and alternative fuels for sustainable offshore operations: a case study of PSVS on the Norwegian continental shelf. Høgskolen i Molde - Vitenskapelig høgskole i logistikk. Full text in Research Archive

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