Blar i Institutt for havromsoperasjoner og byggteknikk på forfatter "Æsøy, Vilmar"
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A Comprehensive Survey of Prognostics and Health Management based on Deep Learning for Autonomous Ships
Ellefsen, Andre; Ushakov, Sergey; Æsøy, Vilmar; Zhang, Houxiang (Journal article; Peer reviewed, 2019)The maritime industry widely expects to have autonomous and semiautonomous ships (autoships) in the near future. In order to operate and maintain complex and integrated systems in a safe, efficient, and cost-beneficial ... -
A multi-body dynamic model based on bond graph for maritime hydraulic crane operations
Chu, Yingguang; Æsøy, Vilmar (Chapter; Peer reviewed, 2015)This paper presents a bond graph model of a maritime crane lifting system comprised of a 3DOFs crane with three revolute joints, a winch, a segment of wire, and a pendulum load. The multi-body model contains the dynamic ... -
An Object-Oriented Modeling Approach to Virtual Prototyping of Marine Operation Systems Based on Functional Mock-Up Interface Co-Simulation
Chu, Yingguang; Hatledal, Lars Ivar; Æsøy, Vilmar; Ehlers, Sören; Zhang, Houxiang (Journal article; Peer reviewed, 2018)This paper presents an object-oriented modeling (OOM) approach to model development of marine operation systems, specifically the hydraulic systems of marine cranes. Benefited from the rapid development of computation ... -
An Unsupervised Reconstruction-Based Fault Detection Algorithm for Maritime Components
Ellefsen, Andre; Bjørlykhaug, Emil Dale; Æsøy, Vilmar; Zhang, Houxiang (Journal article; Peer reviewed, 2019)In recent years, the reliability and safety requirements of ship systems have increased drastically. This has prompted a paradigm shift toward the development of prognostics and health management (PHM) approaches for these ... -
Applying System-Oriented Sustainability Scoring for Cruise Traffic Port Operators: A Case Study of Geiranger, Norway
Johansen, Børge Andreas Heggen; Aspen, Dina Margrethe; Sparrevik, Magnus; Æsøy, Vilmar (Peer reviewed; Journal article, 2021)Balancing the positive and negative impacts of cruise tourism is a challenging task for port operators. Necessary information for cruise port planning and decision making may be laborious to acquire and further combine for ... -
Auto-docking av lite passasjerfartøy
Hagen, Eivind (Bachelor thesis, 2019)Denne bacherloroppgaven er skrevet for NTNU Ålesund, og går ut på å utvikle et konsept for automatisk docking og lading av autonome passasjerbåter. Dette dockingkonseptet er tenkt som en del av bypakken i Ålesund, der ... -
Automatic Fault Detection for Marine Diesel Engine Degradation in Autonomous Ferry Crossing Operation
Ellefsen, Andre; Cheng, Xu; Holmeset, Finn Tore; Ushakov, Sergey; Æsøy, Vilmar; Zhang, Houxiang (IEEE International Conference on Mechatronics and Automation;, Chapter, 2019)The maritime industry generally anticipates having semi-autonomous ferries in commercial use on the west coast of Norway by the end of this decade. In order to schedule maintenance operations of critical components in a ... -
Component-based Modelling and Simulation for Marine Crane System Design.
Li, Yu (Master thesis, 2016)This master thesis is going to develop a hydraulic components library for modelling and simulation for marine crane system design. The topic of this thesis is "Component-based modelling and simulation for marine crane ... -
Computational Fluid Dynamics Simulations of Nonlinear Sloshing in a Rotating Rectangular Tank Using the Level Set Method
Grotle, Erlend Liavåg; Bihs, Hans; Æsøy, Vilmar; Pedersen, Eilif (Journal article; Peer reviewed, 2018)In this paper, numerical simulations of nonlinear sloshing in rectangular tanks are presented. Model implementations in the open source software reef3d are tested, and the results are compared with experimental data from ... -
Conceptual design study of a harvesting tool for large-scale seaweed production on current kelp farms
Johansen, Markus Mathisen (Master thesis, 2022)Tare er blitt et populært og mye diskutert tema de siste årene på grunn av dets mange ideelle egenskaper som plante og ressurs. Tare finnes i naturen eller kan dyrkes. Begge metoder praktiseres, men siden høsting av vill ... -
Control of the combustion process and emission formation in marine gas engines
Krivopolianskii, Vladimir; Valberg, Ingebrigt; Stenersen, Dag; Ushakov, Sergey; Æsøy, Vilmar (Journal article; Peer reviewed, 2018)A smooth transition to the use of gas engines instead of conventional engines in marine shipping is a logical pathway for compliance with tightening environmental regulations. Currently, five major gas engine concepts are ... -
Deep Reinforcement Learning based Energy Management in Marine Hybrid Vehicle
Kumar, Swapnil (Master thesis, 2021)Automatisering har nylig fått mye oppmerksomhet fra maritim industri. Selv om mye autonome navigasjoner har blitt lagt vekt på, er det også viktig å ta opp behovet for autonom kontroll av andre prosesser som energiledelse. ... -
Design Optimization of Exhaust Gas Economizer Using CFD Simulations for Medium Speed Marine Diesel Engines Combine with Exhaust After Treatment
Hewagama, Prabath Priyadarshana (Master thesis, 2021)Denne oppgaven presenterer optimaliseringen av avgassøkonomiseringsenheten til et spillgjenvinningssystem for en middels hastighets marine dieselmotor ved bruk av CFD-simuleringer og kombinert systemkonseptutvikling med ... -
Development of a parametric CAD model for braided ropes
Rødal, Bodil (Master thesis, 2019)Fletting har eksistert i århundrer og er kanskje mest kjent i form av hårfletting. I dag har fletting mange forskjellige bruksområder. Det er brukt i både tekstil-, medisin-, fly- og marin industri. Motivasjonene for denne ... -
Distributed Co-Simulation of Maritime Systems and Operations
Sadjina, Severin Simon; Kyllingstad, Lars Tandle; Rindarøy, Martin; Skjong, Stian; Æsøy, Vilmar; Pedersen, Eilif (Journal article, 2018)Here, we present the concept of an open virtual prototyping framework (VPF) for maritime systems and operations that enables its users to develop reusable component or subsystem models, and combine them in full-system ... -
Dynamic modelling of the thermal response enhanced by sloshing in marine LNG fuel tanks
Grotle, Erlend Liavåg; Æsøy, Vilmar (Journal article; Peer reviewed, 2018)This paper investigates the thermal response in marine liquefied natural gas (LNG) fuel tanks by experiments and modelling. The aim of this work is to develop phenomenological models that can predict the rapid pressure ... -
An effective model-based thruster failure detection method for dynamically positioned ships
Wang, Tongtong; Li, Guoyuan; Skulstad, Robert; Æsøy, Vilmar; Zhang, Houxiang (Chapter, 2020)This paper presents an effective model-based thruster failure detection and isolation method for dynamically positioned (DP) offshore surface vessels. A DP vessel is supposed to maintain its position and heading at a ... -
Experimental and Numerical Investigation of Sloshing under Roll Excitation at Shallow Liquid Depths
Grotle, Erlend Liavåg; Bihs, Hans; Æsøy, Vilmar (Journal article; Peer reviewed, 2017)This paper investigates sloshing at shallow-liquid depths in a rectangular container by using experimental and numerical methods. A motion platform is used to perform a prescribed periodic rotational motion to excite the ... -
Experimental Study of Ignition Delay, Combustion, and NO Emission Characteristics of Hydrogenated Vegetable Oil
Krivopolianskii, Vladimir; Bjørgen, Karl Oskar Pires; Emberson, David; Ushakov, Sergey; Æsøy, Vilmar; Løvås, Terese (Journal article; Peer reviewed, 2019)In this article, a comparative study of hydrogenated vegetable oil (HVO) and diesel was performed in two constant volume combustion rigs and an optical accessible compression-ignited chamber (OACIC). Ignition, combustion, ... -
Fault Prognostics Using LSTM Networks: Application to Marine Diesel Engine
Han, Peihua; Ellefsen, Andre; Li, Guoyuan; Æsøy, Vilmar; Zhang, Houxiang (Peer reviewed; Journal article, 2021)Maintenance is the key to ensuring the safe and efficient operation of marine vessels. Currently, reactive maintenance and preventive maintenance are two main approaches used onboard. These approaches are either cost-intensive ...