Blar i SINTEF Ocean på forfatter "Fagerholt, Kjetil"
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2D-packing with an application to stowage in Roll-on Roll-off liner shipping
Hansen, Jone; Hukkelberg, Ivar; Fagerholt, Kjetil; Stålhane, Magnus; Rakke, Jørgen Glomvik (Journal article; Peer reviewed, 2016-08-14)Roll-on/Roll-off (RoRo) ships represent the primary source for transporting vehicles and other types of rolling material over long distances. In this paper we focus on operational decisions related to stowage of cargoes ... -
A genetic search-based heuristic for a fleet size and periodic routing problem with application to offshore supply planning
Borthen, Thomas; Loennechen, Henrik; Wang, Xin; Fagerholt, Kjetil; Vidal, Thibaut (Journal article; Peer reviewed, 2017-08-22)This paper introduces a genetic search-based heuristic to solve an offshore supply vessel planning problem (SVPP) faced by the Norwegian oil and gas company Statoil. The aim is to help the company in determining the optimal ... -
A New Formulation for the Combined Maritime Fleet Deployment and Inventory Management Problem
Dong, Bo; Bektas, Tolga; Chandra, Saurabh; Christiansen, Marielle; Fagerholt, Kjetil (Journal article; Peer reviewed, 2017-09-27)This paper addresses the fleet deployment problem and in particular the treatment of inventory in the maritime case. A new model based on time-continuous formulation for the combined maritime fleet deployment and inventory ... -
A Shortest Path Heuristic for Evaluating the Quality of Stowage Plans in Roll-On Roll-Off Liner Shipping
Hansen, Jone R.; Fagerholt, Kjetil; Stålhane, Magnus (Journal article; Peer reviewed, 2017-09-27)Roll-on Roll-off shipping companies transport rolling cargo, such as cars, trucks and large construction machines. When sailing, this type of cargo must be attached to the deck using chains, to prevent damaging the cargo. ... -
A survey on maritime fleet size and mix problems
Pantuso, Giovanni; Fagerholt, Kjetil; Hvattum, Lars Magnus (Journal article; Peer reviewed, 2014-06-01)This paper presents a literature survey on the fleet size and mix problem in maritime transportation. Fluctuations in the shipping market and frequent mismatches between fleet capacities and demands highlight the relevance ... -
A variable neighbourhood search heuristic for disruption management in offshore oil and gas logistics
Stålhane, Magnus; Albjerk, Nils; Danielsen, Teodor; Krey, Stian; Fagerholt, Kjetil (Journal article; Peer reviewed, 2018-04-18)This paper studies operational planning and disruption management in offshore oil and gas logistics. A significant amount of time is currently spent on operational planning, and major costs are caused by disruptions to the ... -
A vessel pickup and delivery problem from the disruption management in offshore supply vessel operations
Albjerk, Nils; Danielsen, Teodor; Krey, Stian; Stålhane, Magnus; Fagerholt, Kjetil (Journal article; Peer reviewed, 2016-06-10)This paper considers a vessel pickup and delivery problem that arises in the case of disruptions in the supply vessel logistics in the offshore oil and gas industry. The problem can be modelled as a multi-vehicle pickup ... -
Analyzing different designs of liner shipping feeder networks: a case study
Msakni, Mohamed Kais; Fagerholt, Kjetil; Meisel, Frank; Lindstad, Elizabeth (Peer reviewed; Journal article, 2020-02)This paper proposes different network structures for a real liner shipping company to serve demands between Norwegian and European continental ports. The current practice of the shipping company deploys a feeder network ... -
Benchmark Suite for Industrial and Tramp Ship Routing and Scheduling Problems
Hemmati, Ahmad; Hvattum, Lars Magnus; Fagerholt, Kjetil; Norstad, Inge (Journal article; Peer reviewed, 2014-07-01)This paper considers a class of cargo ship routing and scheduling problems from industrial and tramp shipping and presents a wide range of benchmark instances that have been created to represent realistic planning problems ... -
An economic analysis of introducing autonomous ships in a short‐sea liner shipping network
Akbar, Abeera; Aasen, Anna Kristine Almestad; Msakni, Mohamed Kais; Fagerholt, Kjetil; Lindstad, Elizabeth; Meisel, Frank (Journal article; Peer reviewed, 2020-03-16)The development of autonomous ships is at an advanced stage. It seems to be just a question of time before such ships become available at an industrial scale. In this paper, we investigate the economic advantages of utilizing ... -
The Fish Feed Production Routing Problem
Brekkå, Ivar; Randøy, Solveig; Fagerholt, Kjetil; Thun, Kristian; Vadseth, Simen Tung (Peer reviewed; Journal article, 2022)This paper introduces the fish feed production routing problem (FFPRP) faced by Norwegian salmon feed producers. The FFPRP is comprised of a production scheduling problem and a rich vehicle routing problem (VRP) and thus ... -
Heuristics for dynamic and stochastic routing in industrial shipping
Tirado, Gregorio; Hvattum, Lars Magnus; Fagerholt, Kjetil; Cordeau, Jean-François (Journal article; Peer reviewed, 2013-01)Maritime transportation plays a central role in international trade, being responsible for the majority of long-distance shipments in terms of volume. One of the key aspects in the planning of maritime transportation systems ... -
Maritime fleet deployment with speed optimization and voyage separation requirements
Borander, Venke; Straume, Anders; Dong, Bo; Fagerholt, Kjetil; Wang, Xin (Journal article; Peer reviewed, 2018-09-20)A shipping company operates a heterogeneous fleet of ships to service a given number of voyages on a number of trade routes over the planning horizon. Each ship has a predefined speed range within which it can sail. Fuel ... -
Maritime routing and speed optimization with emission control areas
Fagerholt, Kjetil; Gausel, Nora Therese; Rakke, Jørgen Glomvik; Psaraftis, Harilaos (Journal article; Peer reviewed, 2015-03)Strict limits on the maximum sulphur content in fuel used by ships have recently been imposed in some Emission Control Areas (ECAs). In order to comply with these regulations many ship operators will switch to more expensive ... -
Maximizing the rate of return on the capital employed in shipping capacity renewal
Mørch, Ove; Fagerholt, Kjetil; Pantuso, Giovanni; Rakke, Jørgen Glomvik (Journal article; Peer reviewed, 2017)Decisions regarding investments in capacity expansion/renewal require taking into account both the operating fitness and the financial performance of the investment. While several operating requirements have been considered ... -
Offshore supply planning in a rolling time horizon
Fernandez Cuesta, Eirik; Andersson, Henrik; Fagerholt, Kjetil (Journal article; Peer reviewed, 2018-09-20)This paper presents a real transportation problem stemming from offshore oil and gas logistics and shows how optimization models used in a rolling horizon simulation framework can be very valuable to assess and improve the ... -
On two speed optimization problems for ships that sail in and out of emission control areas
Fagerholt, Kjetil; Psaraftis, Harilaos (Journal article; Peer reviewed, 2015)This paper deals with two speed optimization problems for ships that sail in and out of Emission Control Areas (ECAs) with strict limits on sulfur emissions. For ships crossing in and out of ECAs, such as deep-sea vessels, ... -
Operational planning for routes and schedules for a fleet of fuel supply vessels
Christiansen, Marielle; Fagerholt, Kjetil; Rachaniotis, Nikos; Stålhane, Magnus (Journal article; Peer reviewed, 2017-09)This paper considers a real operational problem of routing and scheduling a fleet of fuel supply vessels used to service customer ships anchored outside a major port. The problem can be formulated as a rich multi-trip ... -
Optimal ship lifetime fuel and power system selection
Lagemann, Benjamin; Lindstad, Elizabeth; Fagerholt, Kjetil; Rialland, Agathe Isabelle; Erikstad, Stein Ove (Peer reviewed; Journal article, 2021)Alternative fuels and fuel-flexible ships are often seen as promising solutions for achieving significant greenhouse gas reductions in shipping. We formulate the selection of alternative fuels and corresponding ship power ... -
Optimization in offshore supply vessel planning
Halvorsen-Weare, Elin Espeland; Fagerholt, Kjetil (Journal article; Peer reviewed, 2016)This paper considers the offshore supply vessel (OSV) planning problem, which consists of determining an optimal fleet size and mix of OSVs as well as their weekly routes and schedules for servicing offshore oil and gas ...