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Publications (10 of 42) Show all publications
Holmes, F. A., Kirchner, N., Kuttenkeuler, J., Krutzfeldt, J. & Noormets, R. (2019). Relating ocean temperatures to frontal ablation rates at Svalbard tidewater glaciers: Insights from glacier proximal datasets. Scientific Reports, 9, Article ID 9442.
Open this publication in new window or tab >>Relating ocean temperatures to frontal ablation rates at Svalbard tidewater glaciers: Insights from glacier proximal datasets
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 9442Article in journal (Refereed) Published
Abstract [en]

Fjord-terminating glaciers in Svalbard lose mass through submarine melt and calving (collectively: frontal ablation), and surface melt. With the recently observed Atlantification of water masses in the Barents Sea, warmer waters enter these fjords and may reach glacier fronts, where their role in accelerating frontal ablation remains insufficiently understood. Here, the impact of ocean temperatures on frontal ablation at two glaciers is assessed using time series of water temperature at depth, analysed alongside meteorological and glaciological variables. Ocean temperatures at depth are harvested at distances of 1 km from the calving fronts of the glaciers Kronebreen and Tunabreen, western Svalbard, from 2016 to 2017. We find ocean temperature at depth to control c. 50% of frontal ablation, making it the most important factor. However, its absolute importance is considerably less than found by a 2013-2014 study, where temperatures were sampled much further away from the glaciers. In light of evidence that accelerating levels of global mass loss from marine terminating glaciers are being driven by frontal ablation, our findings illustrate the importance of sampling calving front proximal water masses.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP, 2019
National Category
Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:kth:diva-255428 (URN)10.1038/s41598-019-45077-3 (DOI)000473294100029 ()31263126 (PubMedID)2-s2.0-85068232430 (Scopus ID)
Note

QC 20190815

Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-15Bibliographically approved
Deutsch, C., Moratelli, L., Thuné, S., Kuttenkeuler, J. & Söderling, F. (2018). Design of an AUV Research Platform for Demonstration of Novel Technologies. In: AUV 2018 - 2018 IEEE/OES Autonomous Underwater Vehicle Workshop, Proceedings: . Paper presented at 2018 IEEE/OES Autonomous Underwater Vehicle Workshop, AUV 2018, 6-9 November 2018, Porto, Portugal. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Design of an AUV Research Platform for Demonstration of Novel Technologies
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2018 (English)In: AUV 2018 - 2018 IEEE/OES Autonomous Underwater Vehicle Workshop, Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Maribot LoLo is an autonomous underwater vehicle (AUV) developed at the KTH Centre for Naval Architecture as part of the Swedish Maritime Robotics Centre (SMaRC). The center's cross-disciplinary activities require an AUV research platform that can be used for data collection and to test and demonstrate novel technologies. The challenge herein is to create a well-performing and yet versatile vehicle. This paper introduces Maribot LoLo and presents the underlying design philosophy which focuses on versatility and endurance. A free-flooded hull offers modularity and modifiability while reliability and robustness are achieved through hardware redundancy and a hierarchical captain-scientist relationship in the embedded system. The vehicle is designed to be operated at moderate water depths and on long-range missions. This leads to challenges in the design of the variable buoyancy system (VBS) which also is presented. The achievable range of the AUV is evaluated with a simple hydrodynamics model based on frictional drag.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Keywords
AUV, buoyancy system, design, long range, research, SMaRC, underwater robotics, versatility, Autonomous vehicles, Buoyancy, Naval architecture, Redundancy, Robotics, Autonomous underwater vehicles (AUV), Cross-disciplinary Activities, Hydrodynamics modeling, Reliability and robustness, Autonomous underwater vehicles
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-262409 (URN)10.1109/AUV.2018.8729729 (DOI)000492901600027 ()2-s2.0-85068336727 (Scopus ID)9781728102535 (ISBN)
Conference
2018 IEEE/OES Autonomous Underwater Vehicle Workshop, AUV 2018, 6-9 November 2018, Porto, Portugal
Note

QC 20191024

Available from: 2019-10-24 Created: 2019-10-24 Last updated: 2020-01-08Bibliographically approved
Dhomé, U., Tretow, C., Kuttenkeuler, J., Wängelin, F., Fraize, J., Fürth, M. & Razola, M. (2018). Development and initial results of an autonomous sailing drone for oceanic research. In: Marine Design XIII: . Paper presented at 13th International Marine Design Conference, IMDC 2018, 10 June 2018 through 14 June 2018 (pp. 633-644). CRC Press/Balkema
Open this publication in new window or tab >>Development and initial results of an autonomous sailing drone for oceanic research
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2018 (English)In: Marine Design XIII, CRC Press/Balkema , 2018, p. 633-644Conference paper, Published paper (Refereed)
Abstract [en]

This paper describes the ongoing development of Maribot Vane, an autonomous sailing vessel at the Maritime Robotics Laboratory of KTH, the Royal Institute of Technology, Stockholm. There is an accelerating need for ocean sensing where autonomous vehicles can play a key role in assisting scientists with environmental monitoring and collecting oceanographic data. The purpose of Maribot Vane is to offer a sustainable alternative for these autonomous missions by using wind and an energy efficient self-steering mechanism. The rig is composed of a free-rotating wing fitted with a coupled control surface. A completely novel wind vane self-steering solution has been developed and is being evaluated. A key point in the development of the vessel is robustness, with a goal of being able to sail in open seas for long period of times. The paper discusses some key concepts, the development method and presents initial results of the new systems. 

Place, publisher, year, edition, pages
CRC Press/Balkema, 2018
Keywords
Automobile steering equipment, Drones, Energy efficiency, Sailing vessels, Autonomous sailing, Coupled controls, Development method, Energy efficient, Environmental Monitoring, Oceanographic data, Royal Institute of Technology, Steering mechanisms, Autonomous vehicles
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-247411 (URN)2-s2.0-85061354805 (Scopus ID)9781138541870 (ISBN)
Conference
13th International Marine Design Conference, IMDC 2018, 10 June 2018 through 14 June 2018
Note

QC 20190502

Available from: 2019-05-02 Created: 2019-05-02 Last updated: 2019-05-20Bibliographically approved
Jain, R. P., Aguiar, A. P., de Sousa, J. B., Zolich, A., Johansen, T. A., Alfredsen, J. A., . . . Kuttenkeuler, J. (2018). Localization of an Acoustic Fish-Tag using the Time-of-Arrival Measurements: Preliminary results using eXogenous Kalman Filter. In: Maciejewski, AA Okamura, A Bicchi, A Stachniss, C Song, DZ Lee, DH Chaumette, F Ding, H Li, JS Wen, J Roberts, J Masamune, K Chong, NY Amato, N Tsagwarakis, N Rocco, P Asfour, T Chung, WK Yasuyoshi, Y Sun, Y Maciekeski, T Althoefer, K AndradeCetto, J Chung, WK Demircan, E Dias, J Fraisse, P Gross, R Harada, H Hasegawa, Y Hayashibe, M Kiguchi, K Kim, K Kroeger, T Li, Y Ma, S Mochiyama, H Monje, CA Rekleitis, I Roberts, R Stulp, F Tsai, CHD Zollo, L (Ed.), 2018 IEEE/RSJ INTERNATIONAL CONFERENCE ON INTELLIGENT ROBOTS AND SYSTEMS (IROS): . Paper presented at 25th IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), OCT 01-05, 2018, Madrid, SPAIN (pp. 1695-1702). IEEE
Open this publication in new window or tab >>Localization of an Acoustic Fish-Tag using the Time-of-Arrival Measurements: Preliminary results using eXogenous Kalman Filter
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2018 (English)In: 2018 IEEE/RSJ INTERNATIONAL CONFERENCE ON INTELLIGENT ROBOTS AND SYSTEMS (IROS) / [ed] Maciejewski, AA Okamura, A Bicchi, A Stachniss, C Song, DZ Lee, DH Chaumette, F Ding, H Li, JS Wen, J Roberts, J Masamune, K Chong, NY Amato, N Tsagwarakis, N Rocco, P Asfour, T Chung, WK Yasuyoshi, Y Sun, Y Maciekeski, T Althoefer, K AndradeCetto, J Chung, WK Demircan, E Dias, J Fraisse, P Gross, R Harada, H Hasegawa, Y Hayashibe, M Kiguchi, K Kim, K Kroeger, T Li, Y Ma, S Mochiyama, H Monje, CA Rekleitis, I Roberts, R Stulp, F Tsai, CHD Zollo, L, IEEE , 2018, p. 1695-1702Conference paper, Published paper (Refereed)
Abstract [en]

This paper addresses the source localization problem of an acoustic fish-tag using the Time-of-Arrival measurement of an acoustic signal, transmitted by the fish-tag. The Time-of-Arrival measurements denote the pseudo-range information between the acoustic receiver and the fish-tag, except that the Time-of-Transmission of the acoustic signal is unknown. Starting with the pseudo-range measurement equation, a globally valid quasi-linear time-varying measurement model is presented that is independent of the Time-of-Transmission of the acoustic signal. Using this measurement model, an Uniformly Globally Asymptotically Stable (UGAS), three stage estimation strategy (eXogenous Kalman Filter) is designed to estimate the position of an acoustic fish-tag and evaluated against a benchmark Extended Kalman Filter based estimator. The efficacy of the developed estimation method is demonstrated experimentally, in presence of intermittent observations using an array of receivers mounted on three Unmanned Surface Vessels (USVs).

Place, publisher, year, edition, pages
IEEE, 2018
Series
IEEE International Conference on Intelligent Robots and Systems, ISSN 2153-0858
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-246308 (URN)10.1109/IROS.2018.8593659 (DOI)000458872701117 ()978-1-5386-8094-0 (ISBN)
Conference
25th IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), OCT 01-05, 2018, Madrid, SPAIN
Note

QC 20190320

Available from: 2019-03-20 Created: 2019-03-20 Last updated: 2019-03-20Bibliographically approved
Stenius, I., Fagerberg, L. & Kuttenkeuler, J. (2016). Experimental eigenfrequency study of dry and fully wetted rectangular composite and metallic plates by forced vibrations. Ocean Engineering, 111, 95-103
Open this publication in new window or tab >>Experimental eigenfrequency study of dry and fully wetted rectangular composite and metallic plates by forced vibrations
2016 (English)In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 111, p. 95-103Article in journal (Refereed) Published
Abstract [en]

This paper deals with the shortcomings in current design methods for dynamically loaded composite structures in underwater applications. This is done through an experimental study to evaluate the eigenfrequencies of rectangular plates made from metals as well as composites that are tested in air (dry) and completely submerged under water (fully wetted). The eigenfrequencies are studied using forced vibrations. The test series comprises 19 specimens that are made from various materials including aluminium, steel, glass-fibre, and carbon-fibre with aspect ratios varying from 3.7 to 11.2 and breadth to thickness ratios ranging from 2.7 to 20.5. The test method is based on electro-mechanical excitation by random vibrations as well as stepped sine refinements in the vicinity of the identified eigenfrequency. The results clearly show how differently the specimens are affected by the "added mass" from the water when fully wetted compared to the dry condition. Slender and more lightweight configurations are more profoundly affected by water than heavier and more rigid specimens. The results clearly show that for advanced composite materials and more complex geometries the current rule-of-thumb methods used by the industry today are inadequate in predicting the shift in natural frequency due to the effect of the surrounding water.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Added mass, Composites, Eigenfrequency, Experiments, Fluid-Structure Interaction, Plates
National Category
Aerospace Engineering Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-181475 (URN)10.1016/j.oceaneng.2015.10.047 (DOI)000368219600010 ()2-s2.0-84947226717 (Scopus ID)
Note

QC 20160202

Available from: 2016-02-02 Created: 2016-02-02 Last updated: 2017-11-30Bibliographically approved
Skoglund, L., Kuttenkeuler, J., Rosén, A. & Ovegard, E. (2015). A comparative study of deterministic and ensemble weather forecasts for weather routing. Journal of Marine Science and Technology, 20(3), 429-441
Open this publication in new window or tab >>A comparative study of deterministic and ensemble weather forecasts for weather routing
2015 (English)In: Journal of Marine Science and Technology, ISSN 0948-4280, E-ISSN 1437-8213, Vol. 20, no 3, p. 429-441Article in journal (Refereed) Published
Abstract [en]

This paper presents and discusses the results of a comparison between using deterministic and ensemble weather forecasts for weather routing. The study is based on comparisons between predicted and realised performance of routes suggested by a route optimization method and focuses on two important performance factors, namely, fuel consumption and late arrival. The study is purely qualitative since the simulations do not include re-routing of the vessel as new forecasts become available. To perform the study a multi-objective dynamic programming method is tailored to the problem and implemented to perform the route optimization and a ship performance model is used to calculate the additional fuel consumption due to wind and waves acting on the ship. The results show that route optimization using ensemble weather forecasts has the potential to reduce the risk of late arrival for voyages during periods of harsh weather.

Keywords
Route optimization, Weather routing, Dynamic programming, Ensemble weather forecasts
National Category
Marine Engineering
Identifiers
urn:nbn:se:kth:diva-173765 (URN)10.1007/s00773-014-0295-9 (DOI)000360508200004 ()2-s2.0-84940610304 (Scopus ID)
Note

QC 20150922

Available from: 2015-09-22 Created: 2015-09-18 Last updated: 2017-12-01Bibliographically approved
Skoglund, L., Kuttenkeuler, J. & Rosén, A. (2014). Evaluating Weather Routing Decisions Using Ensemble Weather Forecasts. In: International Conference on Design & Operation of Container Ships: . Paper presented at International Conference on Design & Operation of Container Ships, RINA, 21-22 May 2014, London, UK (pp. 61-66). The Royal Institution of Naval Architects
Open this publication in new window or tab >>Evaluating Weather Routing Decisions Using Ensemble Weather Forecasts
2014 (English)In: International Conference on Design & Operation of Container Ships, The Royal Institution of Naval Architects , 2014, p. 61-66Conference paper, Published paper (Other academic)
Abstract [en]

Weather routing decisions are typically based on performance predictions, in terms of estimated time of arrival, ETA, fuel consumption, and consideration of various constraints on the vessel operation such as limitations on allowable acceleration levels or slamming frequencies.

Place, publisher, year, edition, pages
The Royal Institution of Naval Architects, 2014
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-164393 (URN)978-1-909024-27-4 (ISBN)
Conference
International Conference on Design & Operation of Container Ships, RINA, 21-22 May 2014, London, UK
Note

QC 20150416. QC 20160214

Available from: 2015-04-16 Created: 2015-04-16 Last updated: 2016-02-14Bibliographically approved
Garme, K., Rosén, A., Stenius, I. & Kuttenkeuler, J. (2014). Rough water performance of lightweight high-speed craft. Journal of Engineering for the Maritime Environment (Part M), 228(3), 293-301
Open this publication in new window or tab >>Rough water performance of lightweight high-speed craft
2014 (English)In: Journal of Engineering for the Maritime Environment (Part M), ISSN 1475-0902, E-ISSN 2041-3084, Vol. 228, no 3, p. 293-301Article in journal (Refereed) Published
Abstract [en]

Previous studies have shown how the use of composite materials and application of sophisticated design methods can give significantly lighter high-speed craft structures than what is normally achieved for traditional aluminium designs. A reduction in structural mass and a corresponding reduction in displacement improve the craft calm water performance but can be unfavourable regarding the rough water performance. Here, the rough water performance of two versions of a fast patrol vessel, one in aluminium and the other in carbon fibre sandwich, is studied with simplified semi-empirical methods and more advanced non-linear time domain simulations. In speeds up to 30 knots, the rough water performance of the two craft versions is found to be practically equal. At higher speeds, the lighter composite craft experiences higher vertical accelerations than the heavier aluminium craft, which implies less operational availability. Using trim ballast tanks, the rough water performance of the lighter craft is improved, and it is shown that the acceleration levels can be reduced and even lowered relative to the heavier aluminium craft. This means that the calm water advantages of a lighter composite vessel can be utilized with the same ride comfort and operational availability as for a heavier aluminium vessel.

Keywords
High-speed craft, energy efficiency, lightweight composite materials, vertical acceleration, rough water performance, bow tank, sustainability
National Category
Marine Engineering
Identifiers
urn:nbn:se:kth:diva-73402 (URN)10.1177/1475090212460456 (DOI)000340730100008 ()2-s2.0-84927596264 (Scopus ID)
Note

QC 20140919

Available from: 2012-02-02 Created: 2012-02-02 Last updated: 2017-12-08Bibliographically approved
Razola, M., Kuttenkeuler, J. & Rosén, A. (2013). Adressing localized assault loads in composite craft design. Transactions of the Royal Institution of Naval Architects Part B: International Journal of Small Craft Technology, 154(Part B2), B87-B93
Open this publication in new window or tab >>Adressing localized assault loads in composite craft design
2013 (English)In: Transactions of the Royal Institution of Naval Architects Part B: International Journal of Small Craft Technology, ISSN 1740-0694, Vol. 154, no Part B2, p. B87-B93Article in journal (Refereed) Published
Abstract [en]

This paper addresses the design of composite craft with respect to non-hydromechanic, local loads not explicitly covered in the basic design standards. The primary aim of this paper is to prompt a discussion on these localized assault loads and the associated robustness issue for composite craft. A background and review of craft robustness and resistance to these types of loads is presented to provide a basis for a more nuanced discussion on inherent differences between different material concepts. Through a literature review and interviews with designers and operators different opinions on what is regarded as robust craft and why are identified. Further, a discussion on how progress can be made with respect to designing more efficient craft out of composites, based on the outlining of a possible design approach, is presented.

Keywords
Craft design, Design approaches, Design of composites, Design standard, Literature reviews, Local loads, Material concepts, Robustness issues, Materials properties, Nanostructured materials, Naval vessels, Design
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-131884 (URN)2-s2.0-84879950022 (Scopus ID)
Note

QC 20150624

Available from: 2013-10-21 Created: 2013-10-18 Last updated: 2017-04-28Bibliographically approved
Söder, C.-J., Rosén, A., Ovegård, E., Kuttenkeuler, J. & Huss, M. (2013). Parametric roll mitigation using rudder control. Journal of Marine Science and Technology, 18(3), 395-403
Open this publication in new window or tab >>Parametric roll mitigation using rudder control
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2013 (English)In: Journal of Marine Science and Technology, ISSN 0948-4280, E-ISSN 1437-8213, Vol. 18, no 3, p. 395-403Article in journal (Refereed) Published
Abstract [en]

Severe roll angles can be developed by parametric excitation in relatively moderate weather without any apparent pre-warning for the crew onboard. In this study the prospect of using rudder control to mitigate parametric roll was investigated using multi-degree of freedom simulations. A typical modern Pure Car and Truck Carrier was considered and modelled by coupling a roll model with a planar motion manoeuvring model. The combined model was calibrated using in-service, full-scale trials and model tests. Irregular variations of the metacentric height were applied to simulate recorded, full-scale events of parametric roll that have occurred with the considered design. These simulations with rudder roll control showed promising results and demonstrate that the approach could be very efficient for mitigation of parametric roll.

Keywords
mitigation, parametric roll, pctc, roll damping, rudder roll control
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-121273 (URN)10.1007/s00773-013-0216-3 (DOI)000324110700010 ()2-s2.0-84884288014 (Scopus ID)
Note

QC 20131003

Available from: 2013-04-24 Created: 2013-04-24 Last updated: 2017-12-06Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-3337-1900

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