Factors that could enable the development of a distribution system for hydrogen applied to heavy-duty vehicles in Sweden are studied in this thesis. Fuel cell and hydrogen technology could be a solution in an electrification mix to reduce the environmental impacts of heavy-duty vehicles (Neef, 2009). However, the distribution system for hydrogen in Sweden is limited, with only five hydrogen refueling stations geographically dispersed (Vätgas Sverige, n.d.). In addition, distribution options at the lowest-cost delivery mode are highly dependent on the hydrogen application, density of demand, quantity to be transported, and distance between the delivery point and the production (Bersani, et al., 2018) To determine what factors could be decisive to develop a distribution system, the technological innovation system framework has been applied in this study. The analysis is carried out with the framework’s system functions. Further, the analysis is based on literature on hydrogen that considers hindering factors and barriers, policy recommendations, lock-in effects, distribution and transportation, and centralized vs. de-centralized systems. Moreover, data has been collected through 11 semi-structured interviews with actors from different sectors, energy companies, truck manufacturers, and researchers, amongst others. The analysis concludes that cross-sectoral collaboration, pilot testing, and governmental support can be enabling factors for the development of a distribution system in Sweden. / Faktorer som kan möjliggöra utvecklingen av ett distributionssystem för vätgas applicerat för tunga fordon i Sverige studeras i den här studien. Tekniken för bränsleceller och vätgas kan vara en lösning i en elektrifieringsmix för att minska miljöpåverkan från tunga fordon (Neef,2009). Distributionssystemet för vätgas i Sverige är dock begränsat, med endast fem vätgastankstationer som är geografiskt spridda (Vätgas Sverige, n.d.). Dessutom är distributionsalternativen till lägst kostnad i hög grad beroende av väteapplikationen, efterfrågan, kvantitet som ska transporteras och avståndet mellan leveranspunkten och produktionen (Bersani, et al., 2018). För att avgöra vilka faktorer som kan vara avgörande för att utveckla ett distributionssystem har ramverket för teknisk innovation system tillämpats i den här studien. Analysen utförs med ramverkets systemfunktioner. Vidare baseras analysen på litteratur om väte som tar hänsyn till hindrande faktorer och barriärer, policyrekommendationer, lock-in-effekter, distribution och transport och centraliserade kontra decentraliserade system. Dessutom har data samlats ingenom 11 halvstrukturerade intervjuer med aktörer från olika sektorer, energibolag, lastbilstillverkare och forskare, bland annat. Utifrån analysen dras slutsatsen att sektorsövergripande samarbete, pilottestning och statligt stöd är faktorer som kan möjliggöra en utveckling av ett distributionssystem för vätgas i Sverige.

The ever increasing demands on today's engine performance and emissions control is forcing the automotive industry to make use of innovative solutions. One of these is to apply the technology of VNT turbos on commercial petrol vehicles. When using a VNT turbo, the aspect ratio of the turbine can be altered while driving to suit the current operating window. In order to actually gain performance while using a VNT, the vanes have to be properly controlled using a suitable control strategy. In this project, direct collocation have been utilized through the usage of YOP which is an adaptation of CasADi in MATLAB to solve non-linear optimization problems. Comprehensive models of the turbocharger and the cylinders have been built and validated to properly represent a VEP4 LP engine from AUROBAY. The models are implemented in YOP to create and simulate different OCPs using the turbo speed as state and position of the vanes as control signal. With this model in YOP together with the air mass flow per second as reference, a good reference following together with decent values for relevant parameters can be accomplished. Other objective functions such as minimum time and maximal volumetric efficiency are also investigated in the project which yield likewise results. From the results it can be concluded that this type of model and control strategy can be used with success when studying optimal control of a VNT turbo.

Sustainable transport involves more choices and possibilities than ever before, and the topic is widely discussed within the maritime industry. To a large extent the innovations and technology exists, but even though there is a drive and consciousness to change, sustainability is still not a cornerstone in the decision-making process when new ships and transport solutions are developed. The gap between sustainability ambitions and actual actions is far from closed. This thesis introduces a new framework called Systems Engineering for Sustainable Ship design (SE4SS), which is based on the Systems Engineering methodology for conducting concept developments and the Sustainable Development Goals (SDG) for operationalizing sustainability. The new framework makes sustainability aspects an essential part of ship design concept development and the following decision-making process. The SE4SS framework includes an application of the SDGs on a product level (ship) and suggests appropriate tools & methods for sustainability assessment, considering different levels of ambitions and amount of available resources that projects may have. The framework has been validated against three cases of ship design concept development within the commissioner organization SSPA. The result shows that the suggested approach is useful in terms of ; (1) raising a holistic awareness of sustainability aspects in ship design, highlighting the existing opportunities and responsibilities, (2) creating a more transparent trade-off analysis where priorities need to be stated, preventing greenwashing, (3) structuring the process which facilitates the integration of sustainability aspects from the start and the communication between the project manager/naval architect and different stakeholders. Full-scale application of the SE4SS is needed in order to fully validate its usability and generalizability, however this thesis argues that the introduced framework may be a valuable tool in both illuminating and reducing the ambition-action gap within the maritime sector. / Hållbara transporter involverar fler val och möjligheter än någonsin tidigare och ämnet är mycket omdiskuterat inom den maritima industrin. Till stor del så finns redan innovationerna och teknologin som krävs för en hållbar omställning, men trots ett driv och en medvetenhet kring förändring så är hållbarhet fortfarande inte en grundsten i beslutsfattandeprocessennär nya fartyg och transportlösningar utvecklas. Gapet mellan hållbarhetsambitioner och faktiska handlingar är fortfarande stort.Den här masteruppsatsen introducerar ett nytt ramverk kallat systemteknik för hållbar skeppsdesign (SE4SS) som baseras på en systemteknisk metodik för konceptutveckling där FNs globala mål (SDGna) för hållbar utveckling har använts för att operationalisera hållbarhet. Detta nya ramverk gör hållbarhets aspekter till en grundläggande del i konceptutvecklingen av fartyg och den efter följande beslutsprocessen.SE4SS-ramverket inkluderar en applicering av SDGna på produktnivå (fartyg) och föreslår lämpliga verktyg & metoder för hållbarhetsanalyser, där hänsyn tas till att olika ambitionsnivåer samt tillgängliga resurser projekt kan ha.Ramverket har validerats gentemot tre fallstudier av konceptstudier inom fartygsdesign som genomförts av det uppdragsbeställande företaget SSPA. Resultatet visar att det föreslagna ramverket är användbart med avseende på; (1) skapar en holistisk medvetenhet när det gäller hållbarhetsaspekter inom fartygsprojektering där möjligheter och ansvar betonas,(2) skapar en mer transparent avvägningsanalys där prioriteringar måste fastställas, vilket försvårar grönmålning, (3) strukturerar utvecklingsprocessen vilket underlättar både integreringen av hållbarhetsfrågor från början och kommunikationen mellan projektledaren/skeppsdesignern och olika intressenter. Fullskalig applicering av SE4SS behövs för att stärka valideringen kring användarbarhet och generaliserbarhet, emellertid så argumenterar denna uppsats för att det introducerade ramverket kan vara ett värdefullt verktyg när det gäller att både belysa och minska ambition-handlingsgapet inom den maritima branschen.

Shipping is the world’s largest mode of transportation, considering mass moved a distance: it is the most e˙effective way to carry large volumes far. In order for the shipping industry to keep its position and develop even further, efforts are made to increase efficiency and reduce the environmental footprint from the industry. More efficient ships, reduced fuel consumption, use of alternative fuels and exhaust gas treatment are some of the choices to reduce shipping’s environmental footprint and achieve the sustainability goal established by EU and enforced by the International Maritime Organization.Throughout the thesis, en evaluation of 18 energy efficiency measures and 4 alternative fuels is performed. Energy efficiency measures reduce a ship’s fuel consumption and alternative fuels substitutes fossil fuels with higher content of environmentally harmful content. The measures and fuels, covered in the study, are evaluated for nine representative container ship´s. Data from year 2016 are used for the nine container ships. The current procedure followed for new investments is analyzed for all measures and fuels for each ship, focused on the financial study of each measure and fuel. The results are then included in a risk and benefit analysis that introduces external aspects, not included in the traditional financial evaluation, that include: those that influence the ship and the ship’s environment and those affected by the ship’s operations.The main goal is to evaluate the possibilities to reduce emissions by considering these aspects and involve more stakeholders in the investment of measures and fuels for shipping to keep its position as the most efficient mode of transportation.

Road feedback is an essential part of the driving experience, representing a connection betweenthe driver and the vehicle motion. Road feedback in a steer-by-wire system must berecreated and transferred to the driver through a feedback motor mounted on the steeringwheel. This project aimed to implement a function in the feedback motor control with thepurpose of giving the driver road feedback. The function should enhance the drivers trustand confidence in the steering system. Specifically, the function should provide the driverwith a feeling of being connected to the vehicle. A pre-study on the subject of steering feel was made as well as an interview study, whichresulted in a list of hypotheses. The hypotheses became a basis for generating conceptideas, together with measurement data of vehicle network signals for different drivingscenarios. Two different functions were then modelled and implemented in MathWorksSimulink. Function 1 models force components acting on the front road wheels in longitudinal,lateral and vertical direction. The forces result in a torque contribution fromeach dimension that acts around the steering axis and represents a reaction in the steeringsystem due to road disturbances. The torque is then translated to a steering wheel torque.Function 2 strives to capture road surface roughness through the high frequency informationin the steering rack motor torque. Three different road surfaces were studied; smoothasphalt, rough asphalt and gravel road. A test rig was used in order to verify the behaviour of the functions. The final step of theproject was to implement the functions in a test vehicle, where they could be further tunedand evaluated. The force component models of Function 1 captured different types of roadfeedback which were evaluated separately by timing, authenticity and desirability. Theresult of this evaluation was positive considering them separately. When the models werecombined it resulted in an unwanted behaviour. Function 2 gave torque feedback that feltauthentic and natural, especially for the gravel road case. However, it was more difficult todistinguish different asphalt types. The conclusion was that neither Function 1 nor 2 couldbe approved as finished functions, however both are considered as interesting concepts forfurther development. Fully steer-by-wire steering transmissions have now been approved for usage. This meansthat one of the remaining challenges for implementing steer-by-wire cars on today’s marketis the subjective views from the customers. Function 1 and 2 could be a way to providethe drivers with trust towards the steering, and at the same time, enhance the drivingexperience. / <p>The presentation was held at ACAS at Linköping University. The presentation included a summary and learnings from the project. A short demonstration was performed using a test-rig consisting of a steering wheel, a feedback motor and a control unit. </p>

Nowadays vehicle design paradigm influences not only the effectiveness of the different means of transport, but also the environment and economy in a critical way. The assessment of the consequences that design choices have on society at large are necessary to understand the limits of the methods and techniques currently employed. One of the mechanisms set in motion is the planned obsolescence of products and services. This has affected vehicle design paradigm in such a way that the variety in the market has shadowed the primary function of vehicle systems: the transport of persons and goods. Amongst the consequences of the expansion of such market is the exponential rise on combustion emissions to the atmosphere, which has become a great hindrance for humans health and survival of ecosystems. The development of evaluation tools for such consequences and their piloting mechanisms is needed so as to implement an ECO2  (Ecological and Economical) vehicle design paradigm. Moreover, the multifunctional design paradigm that drives aeronautical and vehicle engineering is an ever-growing demand of smart materials and structures, able to fulfil multiple requirements in an effective way. The understanding of certain phenomena intrinsic to the introduction of novel materials has found certain limits due to the complexity of the models needed. This work presents as a first step an assessment of the causes and consequences of the vehicle exponential market growth based on the analysis of the planned obsolescence within. Furthermore, a method for the acoustic response analysis of multilayered structures including anisotropic poroelastic materials is introduced. The methodology consists in a plane wave approach as a base for introducing the complex mechanic and acoustic equations governing anisotropic homogeneous media, e.g. open-celled foams, into an alternative mathematical tool manipulating physical wave amplitudes propagation within the studied media. In addition, this method is coupled to a power partitioning and energetic assessment tool so as to understand the phenomena present in complex multilayered designs. / <p>QC 20150323</p>

The main objective of this project is to investigate the applicability of the IMO second-generation intact stability criteria in enhancing the process of designing fishing vessels, which often face stability challenges due to their narrow hulls and harsh operating environments. The study involves analyzing the impact of these criteria, specifically focusing on dead ship conditions and Level 1 and Level 2 excessive acceleration criteria, on the design of three fishing vessels. Through thorough theoretical examination and practical assessment, the research seeks to provide naval architects with valuable insights into designing safer and more stable fishing vessels. The investigation also explores the potential benefits of incorporating bilge keels to mitigate lateral acceleration effects, aiming to enhance crew safety. Finally, a discussion of the computation results is held, followed by a conclusion. / Huvudsyftet med detta projekt är att undersöka tillämpbarheten av IMO:s andra generationens kriterier för intaktstabilitet för att förbättra processen med att designa fiskefartyg. Denna typ av fartyg har ofta flera stabilitetsutmaningar på grund av deras smala skrov och krävande driftsmiljöer. Studien innefattar att analysera effekterna av dessa kriterier, med särskild fokus på "dead ship" villkor samt nivå 1- och nivå 2-kriterierna för kraftiga acceleration, på designen av tre fiskefartyg. Genom teoretisk granskning och praktisk bedömning ämnar forskningen ge fartygskonstruktörer insikter för att designa säkrare och mer stabila fiskefartyg. Undersökningen utforskar också de potentiella fördelarna med att inkludera slingerkölar för att mildra effekterna av lateral acceleration och därmed öka besättningens säkerhet. Rapporten avslutas med en diskussion kring beräkningsresultaten, följt av en slutsats.

High-Frequency Mechanical Impacts (HFMI) is a surface treatment technique utilized to introduce residual stresses and extend the service life of structures. This project primarily focuses on studying the life extension effects of HFMI on welded structures that have undergone fatigue and have existing cracks. This is of significant importance for the maintenance of structures jointed with welds, such as bridge structures. Therefore, this project selected welded components with lower fatigue strength in bridge structures as research specimens for analysis and testing.To simulate the conditions that bridges experienced over many years of usage, initial notches were prepared near the weld toes. A data acquisition and control system was developed to analyze crack propagation behavior, using NI devices to assess the pre-fatigue condition and control the fatigue testing machine. To understand the test results, fracture mechanics calculations and finite element simulations were applied for comparison.In conclusion, based on the experimental results, HFMI improves the life of welded structures with cracks. This demonstrates the feasibility of using HFMI for the maintenance of bridge welding structures and extending their service life. / HFMI (High-Frequency Mechanical Impacts) är en ytbehandlingsteknik som används för att införa restspänningar och förlänga livslängden hos strukturer. Detta projekt fokuserar främst på att studera effekterna av HFMI på svetsade strukturer som har genomgått utmattning och har befintliga sprickor. Detta är av stor betydelse för underhållet av strukturer som sammanfogas med svetsar, t.ex. brokonstruktioner. I detta projekt valdes därför svetsade komponenter med lägre utmattningshållfasthet i brokonstruktioner som forskningsexemplar för analys och provning.För att simulera de förhållanden som broar utsätts för under många års användning förbereddes initiala sprickor vid svetsfogarna. Ett datainsamlings och styrsystem utvecklades för att analysera sprickornas utbredning, med hjälp av NI-enheter för att bedöma tillståndet före utmattning och styra utmattningsprovningsmaskinen. För att göra de experimentella resultaten mer rimliga användes brottmekaniska beräkningar och finita elementsimuleringar för jämförelse.Slutsatsen är att HFMI, baserat på de experimentella resultaten, förbättrar livslängden avsevärt för svetsade strukturer med sprickor av djup mindre än 0.5 mm. Detta visar att det är möjligt att använda HFMI för underhåll av svetsade brokonstruktioner och förlänga deras livslängd.

The aim of this thesis work is to design an electric axle that contains all the operational components, like the powertrain, suspension, brakes, and steering system. One of the requirements of this design work is to package all the axle components compactly in one single unit. This work is also carried out to assess the viability of assisting in the overall modularity of the chassis as modularity in commercial vehicles has become a popular trend in recent years due to the increasing market competition as well as the need for more sustainable products. The work has been carried out in three phases - research, conceptualization, and analysis. The research phase consisted of both market research on the existing products available commercially and a literature review of the various components of an axle to find feasible alternatives to the components currently being used in electric axles. In the conceptualization phase, the various e-axle concepts were compared using methods like PUGH’s matrix to eliminate concepts that did not seem feasible for the detailed design. Preliminary CAD models were designed for the One-motor solution and the In-wheel motor solution. The In-wheel motor solution was eliminated due to some critical limitations and the One-motor solution was chosen for the next sub-phase of detailed CAD modeling. This concept was then analysed using Finite Element analysis as well as kinematic analysis to get insights into the axle performance as well as to observe the load distribution on the axle during operation. / Målet med detta examensarbete är att designa en elektrisk axel som innehåller alla driftskomponenter, såsom kraftöverföring, fjädring, bromsar och styrning. Ett av kraven för denna design är att kompakt packa alla axelkomponenter i en enda enhet. Arbetet utförs också för att bedöma genomförbarheten av att bidra till den övergripande modulariteten hos chassit, eftersom modularitet inom kommersiella fordon har blivit en populär trend de senaste åren på grund av ökad marknadskonkurrens samt behovet av mer hållbara produkter. Arbetet har genomförts i tre faser - forskning, konceptualisering och analys. Forskningsfasen bestod av både marknadsundersökningar av befintliga produkter som finns kommersiellt tillgängliga och en litteraturgenomgång av olika delkomponenter i en axel för att hitta genomförbara alternativ till de komponenter som för närvarande används i elektriska axlar. I konceptualiseringsfasen jämfördes olika e-axelkoncept med hjälp av metoder som PUGH-matrisen för att eliminera koncept som inte verkade genomförbara för den detaljerade designen. Preliminära CAD-modeller designades för enmotorslösningen och in-wheel- motorlösningen. In-wheel-motorlösningen eliminerades på grund av vissa begränsningar, och enmotorslösningen valdes för nästa underfas av detaljerad CAD-modellering. Detta koncept analyserades sedan med hjälp av elementanalys samt kinematisk analys för att få insikter i axelns prestanda och observera belastningsfördelningen på axeln under drift.

Wind propulsion is a traditional way to propel ships over the oceans. In the recent development towards more sustainable shipping, sailing is considered in the industry again with high momentum. For a modern merchant ship, the aerodynamic forces generated on the particular rigging are unusual. Tailored research and experiments are required to understand their influence on the ship’s sailing behaviour. This work concerns the aerodynamic interactions on a model-sized car carrier with four 360° rotatable, symmetric, rigid wings aligned along the centreline on deck. Differential pressures on the wings are measured to capture the generated normal forces. In a comprehensive post-processing, data recorded in systematic experiments at two apparent wind angles were evaluated. A comparison for the different wing positions on board the model shows stronger interactions in upwind sailing conditions than when reaching. The two-dimensional data prove a significant influence of the hull in the normal force profiles over the wing span. The results of this work indicate that the aerodynamic conditions while sailing have to be attentively considered for efficient wing trimming. / Under en lång tid användes främst vindkraft för framdrivningen av fartyg. Det är först på senare år att seglingskonceptet har fått ett nytt uppsving inom marinindustrin med tanke på dess hållbarhet. För fraktfartyg är de aerodynamiska krafterna vid segling ovanliga. Därför behövs särskild forskning och experimentella metoder för att förstå hur de påverkar fartygens seglingsbeteende. I detta arbete undersöks aerodynamiska interaktioner på en modell av ett biltransportfartyg med fyra symmetriska, 360° roterbara vingsegel på däck längs midskeppslinjen. I systematiska experiment på två kurser mot vinden mättes differenstryck över vingprofilen för att undersöka de genererade normalkrafterna. En jämförelse av data från de fyra olika vingpositionerna och båda kurserna mot vinden visar att de aerodynamiska interaktionerna är starkare på kryss än vid halvvind. De upmätta profilerna av tvådimensionella normalkraftkoefficienter över vingspannet visar på betydande aerodynamiska interaktioner med fartygets skrov. Resultaten av detta arbete visar hur viktigt det är med en grundlig undersökning av strömningsförhållandena för en effektiv segeltrim.