Jakob Kuttenkeuler

• Professor
• KTH Royal Institute of Technology

International regulations on greenhouse gas (GHG) emissions as well as strong market demand for zero-emission transport calls for a radical change in the shipping industry. Measures such as hull form optimization, use of alternative fuels and efficient machinery systems, new coatings, and smart routing have already improved the energy efficiency of...

Good knowledge of the atmospheric boundary layer in open seas is crucial for the development of wind-propelled and wind-assisted ships. Still, very little data is available away from the shores, and one needs to rely on modelling to estimate the wind conditions at sea. This paper presents experimental measurements of the vertical wind profile over...

_ Modern wind propulsion systems on ocean-going cargo vessels require automated trimming. Rigid wingsail designs often incorporate more than one degree of freedom enabling to trim for optimal performance in all sailing conditions. A profound understanding of the aerodynamic behavior is the basis for any trimming strategy. The region around stall is...

Uncrewed aerial vehicles (UAVs) are frequently used in glaciological applications, among other things, for photogrammetric assessments of calving dynamics at glacier termini. However, UAVs are often limited by battery endurance and weight constraints on the scientific payload that can be added. At Sálajiegna, the largest freshwater calving glacier...

1. RISE, SSPA Maritime Centre, 2. National Technical Univ. Athens (NTUA) 3. Alfawall Oceanbird, 4. Wallenius Marine, 5. Wallenius Wilhelmsen Ocean AS, 6. Royal Institute of Technology, 7. StormGeo Figure 1. The Orcelle demonstrator International regulations on greenhouse gas (GHG) emissions as well as strong market demand for zero-emission transpor...

Telltales are used by sailors on boats of any size, from a small dinghy up to ocean racing mega yachts. They give information to the trimmer about the local flow conditions on the sails and hence enable optimal trimming. With the development of wind powered commercial vessels, the process of sail trimming however needs to be automated, and new sens...

This study combines high-fidelity simulation models with experimental power consumption data to evaluate the performance of Energy Management Strategies (EMS) for fuel cell/battery hybrid Autonomous Underwater Vehicles (AUV). The performance criteria are energy efficiency, power reliability and system degradation. The lack of standardized drive cyc...

With the current developments of wind powered and wind assisted vessels comes the need for realistic ship model testing. Traditional test methods of free sailing models are somewhat limited by the difficulties to mimic the effects of the wind propulsion systems or at least for recreating them at the correct scale. Simulations are possible but time...

Arctic lakes are exposed to warming during increasingly longer ice-free periods and, if located in glaciated areas, to increased inflow of meltwater and sediments. However, direct monitoring of how such lakes respond to changing environmental conditions is challenging not only because of their remoteness but also because of the scarcity of present...

In this article, the problem of collaborative tracking of an underwater target using autonomous surface vehicles (ASVs) is studied. Distance-based formation control with a collision-avoidance potential function is employed as a solution. A formation control protocol is devised and applied to the formation tracking problem. With the protocol, the ve...

This paper analyses the transit performance of state-of-the-art underwater vehicles and presents an intermediate-fidelity steady-state flight mechanics model for qualitative performance assessment of underwater vehicles. Focusing on the comparison of underwater gliders and propeller-driven AUVs, a simple glide metric is presented and the transit pe...

Preliminary measurements on the atmospheric boundary layer over the open ocean are reported in this paper in order to better understand the wind characteristics, both true and apparent, experienced by very large sails of height up to 100 m and indeed comparable with the atmospheric boundary-layer thickness. A lidar and a sonic anemometer were mount...

This dataset provides measurements of water temperature recorded in the glacier-proximal arctic-alpine Lake Tarfala in the Kebnekaise Mountains, Northern Sweden. Measurements were conducted at least every 120 minutes, between September 2016 and September 2019, at three different sites in the lake. For each site, data take the form of a time series...

Real-time monitoring and evaluation of practical trials with autonomous sailboats is often challenging: varying winds and waves influence a visual evaluation directly connected to a subjective verification of expected mechanical behavior while the inherent nature of sailing with different sensors operating in different coordinate frames complicates...

LoTUS is a bottom landing, Long Term Underwater Sensing node made for the observation of ocean water temperatures. LoTUS is moored to the seafloor and measures temperature according to a specified time schedule until, at the end of the mission, it surfaces to transmit the collected data to on-shore recipients using an Iridium link. The paper presen...

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...

In Arctic alpine regions, glacio‐lacustrine environments respond sensitively to variations in climate conditions, impacting, for example,glacier extent and rendering former ice‐contact lakes into ice distal lakes and vice versa. Lakefloors may hold morphological records of past glacier extent, but remoteness and long periods of ice cover on such la...

This paper presents unique experimental set-ups in model scale and full scale for evaluating roll damping properties of a Panamax Pure Car and Truck Carrier at speed. The purpose of this study is to develop a method for the assessment of roll damping based on full scale trials and to validate the use of roll damping derived from model tests for ful...

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...

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 wet...

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 l...

A comparative Life Cycle Assessment is performed for different structural material concepts on a 24-m-long high-speed patrol craft. The study is comparative and determines the differences in and sensitivities to environmental impact, especially in relation to the total impact of fuel burn for the different material concepts. The material concepts a...

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 performa...

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 l...

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 m...

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 resi...

This paper presents unique experimental set-ups in model scale and full scale for evaluating roll damping properties of a Panamax Pure Car and Truck Carrier at speed. The purpose of this study is to develop a method for the assessment of roll damping based on full scale trials and to validate the use of roll damping derived from model tests for ful...

The paper compares measurement-based measures for human vibration exposure. Data were collected during sea trials on a 10 m, 50 kn coastguard craft equipped with a three-axial accelerometer at the coxswain seat and with vertically mounted gauges measuring the acceleration of the cockpit floor. The ISO 2631-1:1997 measures of vibration (namely the r...

This workshop draws on experience in the international collaboration for engineering education reform, called the CDIO Initiative, where project-based learning is a key part of the concept. The purpose of project-based courses in engineering education is to provide environments where students can develop a deeper working knowledge of technical fund...

The paper considers the hydroelastic interaction involved in panel-water impacts for high-speed craft. Hydroelastic panel-water impacts are simulated by using the finite element code LS-DYNA and a simplified in-house developed method. The mechanisms involved are studied through a systematic series of simulations comprising different impact velociti...

This paper presents an integrated design procedure for determination of structural arrangement and scantlings for the complete structure of small high-speed craft. The purpose of the procedure is to serve as a tool in the preliminary design stage where it enables generation of weight minimized designs with very limited effort. The design procedure...

KTH har infört en ny utbildningsstruktur, som innebär att de två sista åren på civilingenjörsutbildningen utgörs av masterprogram samt att studenterna ska vara behöriga att ta ut en kandidatexamen efter tre års studier. Man kan därmed säga att både kandidat och master ligger inbäddade i den femåriga civilingenjörsutbildningen. Kombinationen av utbi...

The paper reviews experience from the implementation of a project based design-build (DB) course given during the last year of the master level education at two specializations at the Royal Institute of Technology (KTH). Key features concerning constructive alignment, efficient learning modes, the teacher's role, assessment and general implementati...

The paper describes an experimental study with the major aim to get a detailed picture of the pressure distribution carrying a planning craft at high speed through calm water and waves. The instrumentation, load cases and performed runs are discussed as well as the steps to use the measurement data for evaluation of numerical models for planing cra...

The paper deals with sustainability aspects of design-implement courses in engineering education. Conclusions from a course at KTH that has proven to be sustainable are presented, based on experiences from seven years' course development. Design-implement courses are often assumed to be expensive but the presented paper illustrates that they can be...

This paper considers modelling of hydroelasticity in water impacts of ship-hull bottom-panels by use of explicit finite element methods. The finite element analysis is based on a multi-material arbitrary Lagrangian-Eulerian formulation and a penalty contact algorithm. This modelling technique enables the modelling of the instantaneous fluid-structu...

The paper considers full-scale trials that have been performed to evaluate the structural design of the Visby Class corvette. In particular evaluation of the applied design loads is discussed. A method which enables detailed experimental evaluation of the hydrodynamic loads on high-speed craft hull structures is presented. The method involves press...

The paper considers explicit FE-modelling of fluid-structure interaction in hull-water impacts. To minimize the variables studied and to enable comparison with analytical methods, the problem is here idealised as a two-dimensional rigid wedge impacting on a calm water surface. A parameter study is performed, where the sensitivity in the mesh resolu...

Integrated assessment of functional disciplinary knowledge and personal and interpersonal competence is discussed in the context of a final-year project course in a Masters programme in engineering. We state the rationale behind the course design and describe in detail the assessment system, where peer assessment and feedback are key elements. We t...

Design and testing of a blended wing body aeroelastic wind-tunnel model was presented. A simple modular aeroelastic model in combination with sophisticated easy to use experimental equipment for data acquisition was used. An overview of the blended wing body (BWB) concepts and results were presented. The use of optical positioning system in combina...

The aeroservoelastic behaviour of a thin rectangular wing with a controllable trailing edge flap is investigated. A rather high aspect ratio motivates a numerical model based on linear beam theory for the structural dynamics and strip theory for the unsteady aerodynamic loads. Experimental flutter testing shows good agreement with the numerical sta...

The usefulness of an optical motion capture system in aeroelastic wind-tunnel testing is investigated. A system consisting of four infrared charge-coupled device cameras, observing flat passive reflecting markers, is installed in a low-speed tunnel to measure Butter mode shapes. Free vibration and aeroelastic measurements are performed on four wing...

A method for determination of orthotropic elastic material properties of plates using resonance frequencies is developed and verified. The elastic properties are found through minimization of the difference between experimentally measured resonance frequencies and the eigenfrequencies obtained by finite element (FE) analysis using the plate stiffne...

The robustness of aeroelastic design optimization with respect to uncertainties in material and structural properties is studied both numerically and experimentally. The model consists of thin orthotropic composite wings virtually without fuselage. Three different configurations with consistent geometry but varying orientation of the main stiffness...

This thesis treats various aspects of structural polymercomposites in aircraft applications. The mechanical performanceand quality of resin transfer molded (RTM) carbon fiberreinforced epoxy composites is studied. In a first part, the influence of manufacturing process parameters on the mechanicalbehavior of laminates is experimentally investigated...

An experimental and analytical study was made on the effect of stress singularities on the strength of expanded PVC foam materials of different densities. Experiments were performed on specimens with different wedge geometries ranging from sharp cracks, with the ordinary inverted square root stress singularity, to shallow reentrant corners with wea...