Browsing NTNU Open by Author "Norstad, Inge"
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A metaheuristic solution method for optimizing vessel fleet size and mix for maintenance operations at offshore wind farms under uncertainty
Halvorsen-Weare, Elin Espeland; Norstad, Inge; Stålhane, Magnus; Nonås, Lars Magne (Journal article; Peer reviewed, 2017)Maintenance operations at offshore wind farms are challenging due to the offshore element; maintenance technicians and spare parts need to be transported from an onshore port or offshore station to the individual wind farm ... -
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)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 ... -
Fleet Deployment Optimization in Liner Shipping
Steen, Sondre Morten (Master thesis, 2012)This thesis presents a study of a real fleet deployment problem in liner shipping. In the context of data from Saga Forest Carriers and actual contracts between charterers and shipping companies, an optimization model is ... -
Fleet Scheduling of Service Vessels used in a more exposed Norwegian Aquaculture Industry
Ramm, Henrik Theodor; Berge, Alexander Wallem (Master thesis, 2017)This thesis studies a maritime transportation problem for service vessels used in the Norwegian aquaculture industry. We create an optimization model which try to find the most efficient fleet size and mix and associated ... -
Green Tramp Shipping Routing and Scheduling: Effects of Market-Based Measures on CO2 Reduction
Wang, Xin; Norstad, Inge; Fagerholt, Kjetil; Christiansen, Marielle (Chapter, 2019)In this chapter we examine, from a tramp ship operator’s point of view, how potential CO2 emission reduction measures impact the operational decisions and their economic and environmental consequences. Two market-based ... -
Modeling of Seaborne Transport of Fresh Salmon - Inventory Routing with Continuous Time Formulation for a Perishable Product
Kamphus, Marte Tuverud (Master thesis, 2017)Norway produced 1,31 million tonnes of farmed salmon in 2015, and the production is expected to grow to 5 million tonnes in 2050. Every day, around 120 semi-trailers are on the roads, just with the mission of transporting ... -
Optimisation of a New Energy System in Longyearbyen based on LNG and Solar Energy - Applying Mixed Integer Linear Programming and a Rolling Horizon Heuristic
Hovden, Petter (Master thesis, 2018)Longyearbyen is an isolated, Arctic settlement, where the energy situation is facing changes in near future. Today s energy system in Longyearbyen is a stand-alone system, consisting of a coal power plant as primary power ... -
Optimization Model Aimed for the Aquaculture Industry for Fleet Composition and Routing of Wellboats
Hornsletten, Hanne (Master thesis, 2017)The Norwegian aquaculture industry is continuously seeking further growth, and aims to almost fivefold today s salmon production within the year of 2050. As the aquaculture industry is experiencing remarkable growth and ... -
Optimization, risk and resilience in LNG transportation systems
Berle, Øyvind Foldal; Norstad, Inge; Asbjørnslett, Bjørn Egil (Journal article; Peer reviewed, 2013)Purpose – This paper aims to address how to systematically address vulnerability in a maritime transportation system using a formal vulnerability assessment approach, create quantitative measures of disruption risk and ... -
Planning LNG Annual Delivery Programs with Speed Optimization and Multiple Loading Ports
Haug, Helle Villmones; Solum, Sigrid Hallem; Warholm, Sanna Marie Baug; Fagerholt, Kjetil; Li, Mingyu; Norstad, Inge (Peer reviewed; Journal article, 2023)We study the planning problem of creating Annual Delivery Programs (ADPs) in the Liquefied Natural Gas Industry (LNG), in which an LNG producer must fulfill a series of long-term contracts for LNG deliveries with customers ... -
Ship routing and scheduling with speed optimization and voyage separation requirements
Norstad, Inge (Doctoral theses at NTNU;2017:43, Doctoral thesis, 2017)Summary of the thesis This PhD thesis discusses how operations research (OR) can be used to help ship operators with finding good solution for their tactical planning problems. The research has been a part of the larger ... -
The LEANWIND suite of logistics optimisation and full lifecycle simulation models for offshore wind farms
McAuliffe, Fiona Devoy; Lynch, Katie; Sperstad, Iver Bakken; Nonås, Lars Magne; Halvorsen-Weare, Elin Espeland; Jones, Dylan; Wall, Graham; Irawan, Chandra; Norstad, Inge; Stålhane, Magnus (Journal article; Peer reviewed, 2018)The offshore wind sector has achieved significant cost reductions in recent years. However, there is still work to be done to maintain and surpass these savings across current and future farms. There is increased competition ... -
Use of Clusters in a Route Generation Heuristic for Distribution of Fish Feed
Thygesen, Sondre; Haugland, Marius Gyberg (Master thesis, 2017)Fish farming is an industry in growth which is also expanding its area of operation. Among the biggest cost-contributors are costs associated with the distribution of fish feed. The demand is heavily varied and the system ...