Ottar Osen | NTNU - Academia.edu (original) (raw)

Papers by Ottar Osen

Lecture notes in networks and systems, 2023

Journal of Physics: Conference Series

The prospect of a future where the maritime shipping industry is dominated by autonomous vessels ... more The prospect of a future where the maritime shipping industry is dominated by autonomous vessels is appealing and gaining global interest from industry majors, research institutions, and academia. Potential advantages include increased operational safety, reduced costs, and lower environmental footprint. However, the transition will not happen overnight and is not without challenges. For example, algorithms for autonomous navigation must take into consideration safety concerns of the own ship, its crew and passengers, other surrounding ships, and the surrounding environment. This raises a need to test and verify safety, performance, and robustness of the algorithms responsible for the autonomous functionality. In addition, the transition towards fully autonomous ships is likely to be gradual and involve remote control centres and ships with varying degrees of autonomy. Hence, humans will inevitably have to interact with autonomous vessels in a variety of scenarios, including overrid...

Hardware-in-the-loop (HIL) has been used in the industry for many years. This paper investigates ... more Hardware-in-the-loop (HIL) has been used in the industry for many years. This paper investigates some of the advantages of adopting HIL methodology in teaching and training of students in engineering education. HIL can play an important role in teaching since it contributes to fill the holes in engineering students’ knowledge and understanding of software, simulators and actual hardware. The paper describes the HIL methodology, some common industrial applications, benefits from HIL in an industrial setting, how HIL can be used in education of engineering students, why this will benefit the students, and how I have applied HIL in my teaching. As an example of HIL in teaching, I present a HIL system for simulating the operation of a classical on/off valve with two position feedback paths. Hence, the students will make programs (function blocks) that interface the HIL system, which will act as if the students where controlling an actual valve. The HIL system for valve simulation has been developed to a fidelity that in addition to simulating the open and closed feedbacks allows for selection of delay before valve movement and selection of valve travel time. The HIL valve simulator also support simulation of various common fault modes such as unexpected (uncommanded) move. In this way the HIL system is able to give a very accurate representation of a real valve. The HIL system also has a local display for configuration of delay and transit times in addition to displaying percentage open/closed while simulating the movement of the valve. The HIL system as a simulator gave students a better understanding of the industrial challenge and students found it motivating to use the HIL valve simulator because it helped bridge the gap between academic theory and real world challenges.

Big Data Analytics (BDA) and Internet of Things (IoT) are rising quickly. The recent emerging Ind... more Big Data Analytics (BDA) and Internet of Things (IoT) are rising quickly. The recent emerging Industrial IoT (IIoT), a sub-paradigm of IoT, focuses more in safety-critical industrial applications. Studies showed that the adoption of BDA increase companies' output and productivity; IoT enables companies to have more information and control in physical resources, processes, and environments; BDA and IIoT complement each other and develop as a double "helix". In this position paper, we briefly review the opportunities and challenges in this era of big data and IoT for the Møre maritime cluster; then we propose a new framework integrating BDA and IIoT technologies for offshore support vessels (OSVs) based on a hybrid CPU/GPU/FPGA 1 high performance computing platform. We believe that such a framework, when implemented, can help maritime companies increase their output and productivity, and hence enable the whole cluster to continue to be a leader in the global maritime industry.

Journal of offshore mechanics and Arctic engineering, Apr 19, 2021

This paper proposes several schemes for optimal scheduling of power producers in a shipboard powe... more This paper proposes several schemes for optimal scheduling of power producers in a shipboard power system for a typical offshore supply vessel, having a multiple number of possibly varying capacity gensets. The proposed scheduling methods are illustrated using four alternative power system configurations, ranging from a few large gensets to many gensets of smaller ratings. Mixed integer linear programming is used to formulate the optimization problems. Three formulations are presented: one for minimizing online capacity without further objectives, one that includes a redundancy constraint for loosing a group of gensets (to account for a worst-case failure scenario), and one to also balance running hours and minimizing connect/disconnect of the gensets. These different objectives can be combined and weighted based on importance, with or without redundancy constraints. Simulations are carried out to demonstrate the properties of the three different scheduling methods. The first method, minimizing online capacity only, is also used to illustrate the differences between the four genset configurations. This shows, for instance, that using more small gensets ensures generally a lower online available power (the connected capacity matches better the prevailing load) and near optimal loading of each genset around 80% (assuming equal loadsharing), at the same time as resilience to genset failures is preserved.

Fish farming is an important industry along the Norwegian west coast. This industry provides labo... more Fish farming is an important industry along the Norwegian west coast. This industry provides labor opportunities and financial income in areas that are often thinly populated. Fish are subject to diseases carried by pathogens. The value of the fish that are lost due to disease is worrisome, and emergent diseases continue to pose a severe challenge to the aquaculture industry. We have built an agent-based model to simulate the emergence of a hypothetical fish pathogen in an aquaculture facility in the Romsdalsfjord 1 to observe how this pathogen possibly spreads to multiple facilities within the fjord. This model enables us to observe how key parameters such as current speed, current direction, pathogen life span, contagiousness and fish density affect the disease dynamics. The model is implemented in NetLogo, and we have included three aquafarms at the Romsdalsfjord in the experiment.

Communications in computer and information science, 2018

In this article, the authors make a number of observations and reflections based their experience... more In this article, the authors make a number of observations and reflections based their experiences over many years of teaching courses in electrical and computer engineering bachelor programmes. We present important aspects of attendance, lectures, group work, and compulsory coursework, and how these can be addressed to improve student learning. Moreover, we discuss how to facilitate active learning activities, focussing on simple in-classroom activities and larger problem-based activities such as assignments, projects, and laboratory work, and highlight solving real-world problems by means of practical application of relevant theory as key to achieving intended learning outcomes. Our observations and reflections are then put into a theoretical context, including students' approaches of learning, constructive alignment, active learning, and problem-based versus problem-solving learning. Next, we present and discuss the results from two recent student evaluation surveys, one for senior (final-year) students and one for junior (first-and second-year students), and draw some conclusions. Finally, we add some remarks regarding our findings and point to future work.

This paper presents the development of a novel floating mobile platform for inspection and monito... more This paper presents the development of a novel floating mobile platform for inspection and monitoring of aquaculture installations at sea. The application is to provide first-hand information on the integrity of the fish cages, both the structures, the nets and the moorings. The whole system, called “Sea Farm Inspector includes a low cost ROV and a USV. The USV is an active self-stabilising autonomous carrier. The low cost ROV will be carried by the USV to the operation location. A winch on the USV platform will lift the ROV down into the water column and follow the ROV during the operation. The winch will lift the ROV out of water automatically after operation is completed and the “Sea Farm Inspector” will relocate to the next operation site. In the order to make the operation stable and safe, the USV will provide dynamic position control function, autopilot and manual manoeuvring functions. The whole system design and realisations will be presented in detail. A serial of tests both in tank and at sea has been made to verify the concept.

OCEANS 2016 - Shanghai, Apr 1, 2016

This paper presents the development of a bio-inspired swimming robot from concept design to simul... more This paper presents the development of a bio-inspired swimming robot from concept design to simulation for marine aquaculture applications. Based on investigation of several fish motions, the Manta ray is found to be the most suitable mock object since the flapping pectoral fin features long-endurance, low noise, high payload capacity, good stability and maneuverability. Through a comprehensive analysis of the structure of Manta ray, the shape proportional relationship between the body and the pectoral fins is obtained. Even though the concept design simplifies the structure, major functional components are retained. By applying two degrees of freedoms to each segment of the pectoral fin, the propulsion mechanism allow the robotic fish to swim in 3D. In addition, a thrust analysis is performed for a good understanding of the fish's aquatic locomotion principle. The flapping motion is decomposed into two orthogonal waves and realized on the robotic fish, taking advantages of sine generators. Simulation experiments including motion comparison, speed and turning tests verify the correctness of the robotic fish's structure and its propulsion mechanisms.

Robotics and Autonomous Systems, Feb 1, 2016

h i g h l i g h t s • We developed a more efficient 3D field coverage approach compared to existi... more h i g h l i g h t s • We developed a more efficient 3D field coverage approach compared to existing approaches. • We developed a numerical approach to examine the efficiency of 3D coverage algorithms in terms of skip/overlap areas. • We developed side-to-side 3D field coverage approach, which ensure 100% coverage regardless of the topographical nature of the field surface. • Simulation and real field experiments are conducted to prove the efficiency and superiority of the developed approaches.

2023 IEEE 6th Information Technology,Networking,Electronic and Automation Control Conference (ITNEC)

Energy Informatics

As wind turbines continue to grow in size, they are increasingly being deployed offshore. This ca... more As wind turbines continue to grow in size, they are increasingly being deployed offshore. This causes operation and maintenance of wind turbines becoming more challenging. Digitalization is a key enabling technology to manage wind farms in hostile environments and potentially increasing safety and reducing operational and maintenance costs. Digital infrastructure based on Industry 4.0 concept, such as digital twin, enables data collection, visualization, and analysis of wind power analytic at either individual turbine or wind farm level. In this paper, the concept of predictive digital twin for wind farm applications is introduced and demonstrated. To this end, a digital twin platform based on Unity3D for visualization and OPC Unified Architecture (OPC-UA) for data communication is developed. The platform is completed with the Prophet prediction algorithm to detect potential failure of wind turbine components in the near future and presented in augmented reality to enhance user expe...

Fossil fuels such as marine diesel oil (MDO) account for a significant part of the shipping indus... more Fossil fuels such as marine diesel oil (MDO) account for a significant part of the shipping industry’s total operating costs and have a certain negative impact on the environment. Maritime transport emits around 1000 million tonnes of CO2 annually and is responsible for about 2.5% of global greenhouse gas emissions. To focus on fuel saving is therefore important for both economic and environmental reasons. It is indicative that ship owners are now using weather routeing to save fuel and reduce emissions, particularly on long passages. In coastal areas, navigation is limited by traffic rules. This study examines whether fuel consumption can be reduced with current routeing in confined coastal areas, in this case a relatively short voyage in the Oslo Fjord, Norway. An advanced bridge simulator is used, where different current fields from a high-resolution ocean model are implemented. The results reveal that if the voyage is conducted on a typical field with following currents, instead...

TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, 2017

This paper considers the degree of competition among small and medium-sized container ports locat... more This paper considers the degree of competition among small and medium-sized container ports located in a multi-port gateway region. The level of port competition is evaluated by means of an analysis of the revealed preferences in the port-calling pattern of container feeder vessels deployed on their various links and routes. Unit of analysis is feeder vessel sailing legs and ports stays at/between adjacent container ports. At these ports' terminals, ships are moored and loading and unloading of containers are performed. The vessel movement data is provided by the Automatic Identification System (AIS). A study of the principal container ports in the Oslo Fjord area is performed, measuring the actual container feeder traffic during the year of 2015. It is demonstrated to which extent ports in the Oslo Fjord region are acting as substitutes, and to which extent they are functioning more as a complement to each other.

OCEANS 2017 – Anchorage, 2017

Marine aquaculture is deeply rooted in Norwegian national economics and traditions, especially in... more Marine aquaculture is deeply rooted in Norwegian national economics and traditions, especially in the M⊘re og Romsdal region. This paper presents the development of a novel ROV for aquaculture inspection in marine application to provide first-hand information in fishery nets. The ROV is a part of so called “Sea Farm” project. When the ROV doesnot work, it will be carried by a floating platform. A winch on the platform could lift the ROV down to the sea water and lift it out of water after operation. The basic concept of this ROV is low-cost, built with off-shelf and easily manufactured components. There are three wings on the body part. One thruster is embedded into each wing to provide the propulsion. Based on the cooperation of three thrusters, the ROV has omnidirectional movement capability. A serial tests in the water tank were implemented including motion comparison, speed and turning tests to verify the concept and its propulsion mechanisms. In the end, conclusions and future ...

2021 IEEE Global Engineering Education Conference (EDUCON)

Machine-learning requires resources that are usually not available on students private computers/... more Machine-learning requires resources that are usually not available on students private computers/laptops. Instead, students will often need to upload their code to on- or off-campus facilities. This process may be quite challenging for novice students. To mitigate this, we have developed a system for remote execution of machine-learning algorithms on public or private cloud-like environments.

OCEANS 2016 - Shanghai, 2016

Lecture notes in networks and systems, 2023

Journal of Physics: Conference Series

Journal of offshore mechanics and Arctic engineering, Apr 19, 2021

Communications in computer and information science, 2018

OCEANS 2016 - Shanghai, Apr 1, 2016

Robotics and Autonomous Systems, Feb 1, 2016

2023 IEEE 6th Information Technology,Networking,Electronic and Automation Control Conference (ITNEC)

Energy Informatics

TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, 2017

OCEANS 2017 – Anchorage, 2017

2021 IEEE Global Engineering Education Conference (EDUCON)

OCEANS 2016 - Shanghai, 2016

This paper presents an analyzing and modeling scheme that can dig into the ship sensor data to ge... more This paper presents an analyzing and modeling scheme that can dig into the ship sensor data to generate models for ship motion prediction. As the raw sensor data
contains information that is noisy and discontinuous, three data cleaning methods used for noise reduction, data continuing and resampling are developed. According to specific ship applications, various ship motion constraints are designed to
filter and establish meaningful data sets which will be used in the modeling step. Correlation analysis within the data sets is performed to figure out how significant the sensor data contributes to the predictive target. An flexible neural network
based modeling mechanism is implemented, in which the user can design the model based on the correlation analysis. By training and testing the neural network using the generated data sets, the ship motion predictive model is obtained. Through a
case study of fine maneuvering, the scheme is verified efficient in analyzing and modeling sensor data for ship motion prediction.

This paper presents the development of a bioinspired swimming robot from concept design to simula... more This paper presents the development of a bioinspired swimming robot from concept design to simulation for marine aquaculture applications. Based on investigation of
several fish motions, the Manta ray is found to be the most suitable mock object since the flapping pectoral fin features long-endurance, low noise, high payload capacity, good stability and maneuverability. Through a comprehensive analysis of thestructure of Manta ray, the shape proportional relationship between the body and the pectoral fins is obtained. Even though the concept design simplifies the structure, major functional components are retained. By applying two degrees of freedoms to each segment of the pectoral fin, the propulsion mechanism allow the robotic fish to swim in 3D. In addition, a thrust analysis is performed for a good understanding of the fish’s aquatic locomotion principle. The flapping motion is decomposed into two orthogonal waves and realized on the robotic fish, taking advantages of sine generators. Simulation experiments including motion comparison, speed and turning tests verify the correctness of the robotic fish’s structure and its propulsion mechanisms.