This term project’s aim is to theoreticaly analyze thermal phenomena and losses in electrical power devices, describe the design and application of UniGear ZS1 type switchgear, put together a computer simulation model for thermal calculations of current and optimized solution and finally to discuss obtained results and compare them with experimentally acquired values. The main objective of this project is to determine, whether simulation is a viable and reliable enough method, that it could replace the costly real life physical testing. Modelling of the progress of thermal processes in different parts of the examined busbar will be done in computer aided design program Solidworks and its simulation plugin Flow Simulation.

The thesis is focused on a temperature-rise of a low-voltage switchgear. The first part of the work deals with a technical standard related to the chosen topic, compares software used for designing switchgear in practice and familiarizes with the working environment of the software selected for this work. The main part of the work is dedicated to a measurement and a simulation of the temperature-rise of the low-voltage switchgear. The measurement involved testing of the switchgear with regard to the individual functional units and to the whole switchgear. Subsequently, the simulation of the temperature-rise of the switchgear followed. Software used in this work is SolidWorks Flow Simulation chosen due to a wide range of functions. According to the findings there were proposed adjustments of the switchgear with respect to the technical parameters and the economic aspect in the last part of the thesis.

This thesis report aims to help the client developing their new product. The new product to be developed is a safety bracket for a safety system. The safety bracket connects different parts which create the safety system and it should be able to withstand impacts from moving objects. The client has a set of requirements that needs to be addressed during the product development process. One of the most important requirements that must be fulfilled is the given impact energy that the safety bracket must withstand. The methodology used during this thesis work is the product development processes (PDP). The product development process is used to find concepts that have the potential to answer the research questions and to fulfil the requirements. Some methods used in the product development process are brainstorming, brainwriting and combining working principles. The concepts were evaluated with a combination of Pugh´s matrix and weighting matrix. The three best concepts were selected for further development and tested with FEA simulation with Abaqus CAE. The impact simulation gave indications if the concepts could handle the impact energy and if they could fulfil the requirements. All three concepts could withstand the impact energy based on the simulations and most of the requirements could be fulfilled. The concepts with thinner profile walls had a reduction in stress and an increase in impact duration, where the kinetic energy is distributed throughout the impact. A protective shell helps with the reduction of stress and the energy absorption during the impact simulation.

This thesis is a study on an unconventional slow speed direct drive permanent magnet (PM) generator. Unlike a standard permanent magnet synchronous generator (PMSG) which has the copper coils wound around iron teeth, the work in this thesis will present a generator where the copper coils are directly mounted on the stator which eliminates the slots and teeth in the generator. By having a slotless design it is possible to eliminate cogging torque, iron losses in teeth and achieve a lightweight design. These characteristics can prove useful when developing generators for an application such as wind turbines, or more specifically vertical axis wind turbines (VAWTs) in remote areas where weight and serviceability is of concern. This thesis consists of two main parts where the main focus was on the design and simulation of slotless generators. The second part of the thesis was to investigate an available slotless axial flux machine. For the simulations, three different models were created in 2D using CAD software. Two of the models were double-rotor slotless generators and one was a single rotor variant. The electromagnetic properties of these models were analysed using FEMM and COMSOL. The results showed that the double rotor variant with the smaller magnets were more favourable considering the price of magnets and no iron core losses. The experimental results of the axial flux machine gave insight into the construction of commercially available axial slotless generators which could be used to further analyse these types of machines.

No description available.

The use of drones is becoming increasingly common in the industry due to their efficiency and safety in environments that are difficult to access. The development of industrial drones has created a new need for specialized drones with unique functions. This has led to a growing interest in additive manufacturing as a production method. Additive manufacturing, previously primarily used for prototyping, is now emerging as a viable manufacturing method. This evolution has in turn opened new design methods intended for additive manufacturing, such as topology optimization. The purpose of this project was to redesign a drone to increase its strength, reduce its weight and improve water resistance and appearance. This was achieved using a classic product development process where a concept was developed and refined using simulation tools and a product requirement specification derived from interviews and observations of the existing drone. The product was developed using SolidWorks tools such as Topology Optimization, The Finite Element (FEM) and Computer Aided Design (CAD). The result of the work is a detailed design and a prototype developed using Topology simulations based on the product requirement specification. This project lays the foundation for continued production and development of the drone. The conclusion drawn from the work is that the new product is an improved version in several aspects compared to the previous product.

In Sweden, there are students who live in small student apartments. These apartments can be called compact living as a student apartment can be as small as 16 square meters. To take advantage of the place that is in small homes, it would be good if larger furniture could be combined into a piece of furniture. On behalf of Husmuttern AB, this work has been aimed at exploring furniture concepts with sleeping and their functions in a compact living environment for students. The issues being examined are: -          What functions are desirable in a multifunctional seating and sleeping furniture for students and people living in compact living environments? -          How can a multifunctional seating and sleeping furniture be designed, that is applied to students living in a compact-living environment? Human Centered Design was used as a method and thus a qualitative data collection was carried out in the form of observations. The respondents were in the primary target group and were observed in their everyday lives in their homes. A focus group was involved in generating ideas and concepts. Functional prototypes were built, and 3D models were created in SolidWorks. Digital testing of the concepts was carried out and the development of the Generation Sofa Bed was realized. There is a discussion about how reliable this study is, when the results became situational. However, the respondents were from a limited audience and had different views on what they wanted from a sofa bed, which provided rewarding information for the development of the furniture. The conclusion is that while the Generation Sofa Bed needs to be further developed through testing and evaluation of storage facilities, it has great potential to become a finished product. / I Sverige bor det studenter i små studentlägenheter. De lägenheterna kan kallas för compact living då en studentlägenhet kan vara så liten som 16 kvadratmeter. För att ta vara på den plats som finns i små hem vore det bra om större möbler kunde kombineras till en möbel. På uppdrag av Husmuttern AB har detta arbete haft som syfte att utforska möbelkoncept med sov- och sittfunktioner i en compact living miljö för studenter. De frågor som undersöks är: 1.      Vilka funktioner är önskvärda i en multifunktionell sitt- och sovmöbel för studenter och personer som bor i compact living miljö? 2.      Hur kan en multifunktionell sitt- och sovmöbel konstrueras, som är tillämpad för studenter som bor i compact-living miljö?  Human Centered Design användes som metod och därmed genomfördes en kvalitativ datainsamling i form av observationer. Respondenterna var med i den primära målgruppen och observerades i sin vardag i sina hem. En fokusgrupp var med och genererade idéer och koncept. Funktionsprototyper byggdes och 3D modeller skapades i SolidWorks. Digital testning av koncepten genomfördes och utvecklingen av Bäddsoffan Generations blev förverkligad. Det finns en diskussion om hur pålitlig denna studie är, då resultaten blev situationsbaserade. Dock var respondenterna från en begränsad målgrupp och hade olika syn på vad de ville ha av en bäddsoffa, vilket gav givande information till utvecklingen av möbeln. Slutsatsen är att medan Bäddsoffan Generations behöver vidareutvecklas genom testning och utvärdering om förvaringsmöjligheter, så har den stor potential att bli en färdig produkt.

Med bakgrund i hur samhällets digitalisering präglar utbildningsväsendet, som i sin tur påverkar skolans teknikundervisning, behandlar det här examensarbetet teknikelevers habitus och strategier som tar sig uttryck i deras möte med användning av digitala verktyg som tillämpas i teknikundervisningen. Inspiration tas från sociologen Pierre Bourdieus teorier om olika kapitalformer och strategier. Dessutom kommer digitalt kapital att tillämpas som ytterligare teoretiskt ramverk. Övergripande syfte med arbetet är att öka förståelse för identifiering av behov och styrkor hos elevmålgruppen i samband med deras användning av digitala verktyg i teknikundervisningen. Studien bygger på en kvalitativ analys via semi- samt strukturerade intervjuer med fyra teknikelever i årskurs 1 samt tre tekniklärare på gymnasiets teknikprogram. Där data bearbetas genom datainsamling via ljudinspelningar och vidare datatranskribering. Analysen presenteras som rekonstruktioner av olika elevhabitus i form av elevprofiler och praktikbeskrivningar utifrån lärarintervjuer. Studiens resultat och analys påvisar en tendens om tidigt utvecklat digitalt kapital sammanflätad med andra kapitalformer såsom socialt- och kulturellt kapital som kännetecknar samtliga elevprofiler oavsett kön. Dessa utifrån beskrivningar som tyder på bland annat elevprofilers stor samlade tillgångar i form av digital tillgänglighet, digitala verktyg, sociala nätverk, föräldrar och/ eller syskon med akademiska utbildningar. Dessutom framträder från praktikbeskrivningar en bild av att samtliga elevprofiler, förutom att vara positiv inställda till användning av digitala verktyg, är som modiga med självständighet i problemlösning oavsett lärarens digitala kompetens. Däremot framhåller samtliga elevprofiler vikten av lärarens kompetens i digitala verktyg för stöd i undervisningen. Enligt praktikbeskrivningar för högre årskurser, krävs det att elevprofilerna utvecklar andra förmågor såsom kommunikations- samt samarbetsförmåga på ett effektivt sätt. Vilket kan tyda på att digitalt kapital behöver utvecklas i relation till andra kapitalformer för framgång och för att tillskrivas av värde i sociala praktiken. Gällande resultat om elevprofilers tidigt förvärvade digitala kapital är det av vikt att undersöka vidare egenskaper såsom mindre tålamod och vana att ”knappa sig fram” ur ett habitusperspektiv. Eftersom enligt praktikbeskrivningar dessa egenskaper anses som negativa i möte med digitala verktyg i teknikundervisningen, vilket kräver att elever följer verktygets instruktioner noggrant. Detta förefaller utgöra att dessa habitus behöver förändras för att elevprofilerna ska kunna förränta dessa som digitalt kapital i skolan som en social praktik. Vidare tenderar faktorer såsom ålder och ekonomisk tillgång i denna studie främja det digitala kapitalet för samtliga elevprofiler. Dessutom påvisar studiens resultat en tendens om att elevprofilernas tillämpade utbildningsstrategier i teknikundervisningen, såsom problemlösnings- samt informationssökningsstrategier, återspeglar deras förvärvade kapitaltillgångar och familjers sociala reproduktionsstrategier. Vidare studier om elevers digitala kapital och dess olika beståndsdelar samt hur skolan och undervisningen kan påverka det digitala kapitalet vore intressant. Detta för att bland annat undersöka hur digitalt kapital kan formas i undervisningen. Med tanke på samspelet mellan digitalt kapital och andra kapitalformer vore det intressant att undersöka hur utfallet kan påverka undervisningskvalitet och elevers lärande. Om detta i sin tur kan påvisas som externa, observerbara sociala resurser såsom elevers framtida val av högre studier och yrkespositioner. Dessutom huruvida kompetensutvecklingsstrategier för lärare inom digitala verktyg är av vikt för huvudmän och skolans organisationer. Detta för att fylla gapet med digitala ojämlikheter som kan komma att utspela sig mellan generationer däribland mellan elever och lärare. Vilket i slutändan kan gynna undervisningen och elevers lärande. / With a background in how society's digitization characterizes the educational system, which in turn affects the school's technology education, this thesis deals with technology students' habitus and strategies that are expressed in their encounter with the use of digital tools applied in technology education. Inspiration is taken from sociologist Pierre Bourdieu's theories on different forms of capital and strategies. In addition, digital capital will apply as additional theoretical framework. The overall aim of the work is to increase understanding of the identification of needs and strengths of the student target group in connection with their use of digital tools in technology education. The study is based on a qualitative analysis via semi- and structured interviews with four technology students in year 1 and three technology teachers in the high school's technology program. Where data is processed through data collection via audio recordings and further data transcription. The analysis is presented as reconstructions of different student habits in the form of student profiles and practice descriptions based on teacher interviews. The study's results and analysis demonstrate a tendency of early developed digital capital intertwined with other forms of capital such as social- and cultural capital that characterizes all student profiles regardless of gender. These are based on descriptions that indicate, among other things, student profiles' large collective assets in the form of digital accessibility, digital tools, social networks, parents and/or siblings with academic educations. In addition, a picture emerges from practice descriptions that all student profiles, in addition to being positive towards the use of digital tools, are courageous with independence in problem solving regardless of the teacher's digital competence. On the other hand, all student profiles emphasize the importance of the teacher's competence in digital tools to support teaching. According to practice descriptions for higher grades, it is required that the student profiles develop other abilities such as communication and cooperation skills in an effective way. Which may indicate that digital capital needs to be developed in relation to other forms of capital for success and to be attributed value in social practice. Regarding student profiles' early acquired digital capital, it is important to investigate further characteristics such as less patience and the habit of typing their way in from a habitus perspective. Because, according to practice descriptions, these characteristics are considered negative when dealing with digital tools in technology education, which requires students to follow the tool's instructions carefully. This seems to mean that these habitus need to change in order for the student profiles to be able to profit from these as digital capital in the school as a social practice. Furthermore, factors such as age and financial access in this study tend to promote digital capital for all student profiles. In addition, the results of the study demonstrate a tendency that the student profiles' applied educational strategies in technology education, such as problem-solving and information-seeking strategies, reflect their acquired capital assets and families' social reproduction strategies. Further studies on students' digital capital and its various components, as well as how school and teaching can affect digital capital, would be interesting. This is to investigate, among other things, how digital capital can be shaped in teaching. Considering the interaction between digital capital and other forms of capital, it would be interesting to investigate how the outcome can affect teaching quality and student learning. And if this in turn can be demonstrated as external, observable social resources such as students' future choice of higher studies and professional positions. In addition, whether competence development strategies for teachers in digital tools are of importance to principals and the school's organizations. This is to fill the gap with digital inequalities that may occur between generations, including between students and teachers. Which can ultimately benefit teaching and student learning.

Quad-rotor helicopters are agile aircraft which are lifted and propelled by four rotors. Unlike traditional helicopters, they do not require a tail-rotor to control yaw, but can use four smaller fixed-pitch rotors. However, without an intelligent control system it is very difficult for a human to successfully fly and manoeuvre such a vehicle. Thus, most of recent research has focused on small unmanned aerial vehicles, such that advanced embedded control systems could be developed to control these aircrafts. Vehicles of this nature are very useful when it comes to situations that require unmanned operations, for instance performing tasks in dangerous and/or inaccessible environments that could put human lives at risk. This research demonstrates a consistent way of developing a robust adaptive controller for quad-rotor helicopters, using fuzzy-neural networks; creating an intelligent system that is able to monitor and control the non-linear multi-variable flying states of the quad-rotor, enabling it to adapt to the changing environmental situations and learn from past missions. Firstly, an analytical dynamic model of the quad-rotor helicopter was developed and simulated using Matlab/Simulink software, where the behaviour of the quad-rotor helicopter was assessed due to voltage excitation. Secondly, a 3-D model with the same parameter values as that of the analytical dynamic model was developed using Solidworks software. Computational Fluid Dynamics (CFD) was then used to simulate and analyse the effects of the external disturbance on the control and performance of the quad-rotor helicopter. Verification and validation of the two models were carried out by comparing the simulation results with real flight experiment results. The need for more reliable and accurate simulation data led to the development of a neural network error compensation system, which was embedded in the simulation system to correct the minor discrepancies found between the simulation and experiment results. Data obtained from the simulations were then used to train a fuzzy-neural system, made up of a hierarchy of controllers to control the attitude and position of the quad-rotor helicopter. The success of the project was measured against the quad-rotor’s ability to adapt to wind speeds of different magnitudes and directions by re-arranging the speeds of the rotors to compensate for any disturbance. From the simulation results, the fuzzy-neural controller is sufficient to achieve attitude and position control of the quad-rotor helicopter in different weather conditions, paving way for future real time applications.

Rigid body modeling has historically been used to study various features of the elbow joint including both physical and computational models. Computational modeling provides an inexpensive, easily customizable, and effective method by which to predict and investigate the response of a physiological system to in vivo stresses and applied perturbations. Utilizing computer topography scans of a cadaveric elbow, a virtual representation of the joint was created using the commercially available MIMICS(TM) and SolidWorks(TM) software packages. Accurate 3D articular surfaces, ligamentous constraints, and joint contact parameters dictated motion. The model was validated against two cadaveric studies performed by Chanlalit et al. (2011, 2012) considering monopolar and bipolar circular radial head replacements in their effects on radiocapitellar stability and respective reliance upon lateral soft tissues, as well as a comparison of these with a novel anatomic radial head replacement system in an elbow afflicted with the “terrible triad” injury. Rigid body simulations indicated that the computational model was able to accurately recreate the translation of forces in the joint and demonstrate results similar to those presented in the cadaveric data in both the intact elbow and in unstable injury states. Trends in the resulting data were reflective of the average behavior of the cadaveric specimens while percent changes between states correlated closely with the experimental data. Information on the transposition of forces within the joint and ligament tensions gleaned from the computational model provided further insight into the stability of the elbow with a compromised radial head.