Approaching its midway milestone, the EXPOSED Centre is increasing its focus on turning knowledge into innovations. Some of the main research achievements of the EXPOSED centre to this date are: Environmental descriptions of coastal sites, to improve precision and relevance of the basis for design and operations planning. Salmon and cleaner fish swimming capacity, which is important to assess new locations and new farming technology. Navigation/localization of ROV/AUVs, relative to nets and flexible structures enables more precise and autonomous operations. Machine vision‐based hole detection and integrity control used to improve inspection operations. Modelling of aquaculture systems, including vessel‐structure interaction, as a future tool to study the systems, inform design and monitor conditions. Methods to analyse and predict operational limits, supporting technology development in design decisions and operational planning. Working environment and competence requirements to improve procedures and inform design and technology development. Download Annual Report 2018
In the newly published Annual Report for EXPOSED you can read more about our work last year. In 2017, several innovations and new fish farming concepts have been presented, driven by the opportunity to apply for development licences and the persistent challenges of sea lice. Many of the 104 submitted applications aim at farming at exposed locations. SalMar's Ocean Farm 1 was the first concept to be approved. Partners in EXPOSED contribute with significant R & D to this and several of the other novel fish farm concepts. Also, fish farming and marine operations at current sites with state-of-the-art technology remain challenging and are still highly relevant for the research within the EXPOSED centre. View full annual Report
There is a need in the aquaculture industry for specific training and competence requirements as a supplement to the regulatory qualification requirements. Causal analyses of past fish escape incidents and occupational accidents in the aquaculture industry, show that "inadequate training" has been identified as a contributing factor. Adequate training is therefore an important safety factor, and the knowledge and skills of the workers may be decisive for the operational safety. A workshop was held in October 2017 on training and competence requirements in aquaculture operations. There were group sessions related to competence requirements for today's operations, as well as for future exposed fish farming. The following topics were discussed: Non-conformity reporting and how the reports can be used for learning. Quality management systems with a competence module to document employee training and formal education. Knowledge transfer (theory vs. practice). The importance of equipment-specific training (by manufacturer/technology supplier). Certification courses (HSE, [...]
For net integrity inspection operation using Remotely Operated Vehicles (ROVs), it is very important to be able to accurately decide the position and orientation of the ROV within the net-cage. This information can for instance be used to avoid collision with the net and avoid entanglement of the tether; to accurately pin-point where in the net a hole was detected by the vision system; to know what part of the net has already been inspected; and to plan the motion of the ROV in order to cover the rest of the net structure. Our solution for net-relative localization is based on onboard sensors only (yaw gyro, yaw compass, depth sensor, doppler velocity log, camera, Global Navigation Satellite System (e.g. GPS), and inclinometer or accelerometer. By using a kinematic model of the ROVs position and orientation relative to the net, combined with information from all these sensors, we have obtained very [...]
A proposed methodology for feasibility studies applicable for ship designers involved in the aquaculture industry is described in the project memo "P3 – Vessels – structures interaction; Feasibility study – elements and methodology." Based on a set of critical feasibility elements, its purpose is to provide an efficient and effective way to assess and compare a given number of alternative designs during the conceptual phase of vessel development. The main value of such studies lies, not only in the possibility of assessing a vessel's performance per se, but also how it will perform in a real operational system. Chapter 3 on State of the Art shows how feasibility studies can be regarded as an integrated – and make important contributions – within the phase of concept development of vessel design. Chapter 4 outlines the proposed methodology in detail (see figure 1), also suggesting a set of Key Performance Indicators (KPIs) [...]
As the aquaculture sites are getting more exposed to wind, waves and current, better understanding of forces between vessels and structure is needed. The reliability of mooring lines and connecting lines between vessel and structure should be investigated numerically. To improve the knowledge of contact forces between vessels and structures, an example study is performed. A study of a well boat being moored to a fish cage is conducted in SIMA using a coupled SIMO-RIFLEX simulation to solve motion and force response of the coupled system. Regular waves and current are used in the study. RIFLEX is used to model the fish cage and mooring lines. WAMIT is used to calculate the hydrodynamic properties of the well boat imported to SIMO in the SIMA workbench. The results from the simulation will be published at the 28th International Ocean and Polar Engineering Conference (ISOPE), June 10-15, 2018 in Sapporo, Japan.  [...]
Motion and mooring forces from feed barges need more attention as aquaculture goes more exposed. To efficiently perform analyses of these forces from feed barges, an analysis tool for feed barges is made. The tool consists of a database for different feed barges with pre-calculated feed barges stored in a database for easy access and setup in the SIMA workbench. SIMA1 is a workbench for simulation and analysis of marine operations and floating systems. MULDIF is used to calculate motion and wave drift forces. MULDIF is a linear three-dimensional frequency domain potential theory code. Viscous damping in roll and pitch is estimated and used as input to the MULDIF calculations. In SIMA, the user specifies dimension and mass properties of the feed barge to be analysed, and the tool finds the closest pre-calculated set-up file from the database. The SIMA set-up files contains a user interface for setting environmental conditions and define parameters for the moorings system. When the analysis is conducted, it contains a pre-defined post processor to extract and visualise selected [...]
The Annual report for 2016 is now currently available. The report describes the vision, organisation, plans as well as initial results from the centre. In 2016 there has been full activity. Eight projects have started, covering fundamental research and applied studies, innovation activities, establishment of research infrastructure and recruitment of six PhD candidates. In addition, several associated projects carry out additional activities and involve supplementary candidates. There are still a significant industrial, as well as political interest in EXPOSED and its objectives in 2016. This interest is driven by a combination of: An ambition to increase salmon production, given that key environmental challenges are addressed Increasing salmon prices Low oil prices and suppliers to the oil & gas sector looking for other industries Industrial and political will to adapt competence and capacity from other industries in to seafood A new opportunity for farmers to apply for development concessions regime that [...]
We are happy to announce yet another PhD student welcome to the project. Stian is 24 years old and holds a Masters degree in Engineering and ICT, specialised within Marine Technology. In his master thesis, he has worked with navigation algorithms related to a self-developed low-cost ROV. Alongside his studies, Stian worked with development of ROV's guidance, navigation and control (GNC)-systems at Blueye Robotics. The PhD will focus on navigation of autonomous subsea vehicles aiming towards exposed aquaculture. The plan is to look more closely at the usage of range measurements found through acoustics. To help understanding the problem, a simulator will be developed and used in implementation in a small scale model. Later, the aim is to do tests in large scale facilities. This should contribute in increased usage of autonomous subsea vehicles within aquaculture.
Bent holds a master degree in Marine Cybernetics from NTNU. His Master thesis is about experimental testing of underwater path-following for a Videoray Pro 4 ROV (Remotely Operated Vehicle). Within SFI EXPOSED he will be developing systems for remotely controlled and automated underwater vehicles. This includes the use of ROVs for inspecting fish net or cage conditions as well as verifying the safety of using such systems in the industry. In his spare time, Bent likes to spent time outdoor together with his partner.