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  • 1.
    Alexander, Mattsson
    Halmstad University, School of Business, Engineering and Science.
    Engine stability: A study of the events occurring prior to thecombustion in a small two-stroke engine2017Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    This thesis is a study conducted in collaboration with the engine performance group atHusqvarna AB. The study focuses on engine stability of smaller two stroke handheld enginesrunning on E10 (10% ethanol mixture in gasoline). The reason for the study is the new EUproposition that by 2020 all fuel must have 10 % renewable fuel content. To meet thisproposition Husqvarna has evaluated E10 and found that the engine stability of smaller twostroke engines are affected in a negative way by the fuel.The study focuses on events occurring prior to the combustion and mainly the carburetor. Theobjective for the thesis is to seek what contribution the events occurring prior to thecombustion have to the engine stability and find simple and implantable solution to improvethe stability with regards to the carburetor.The study has been conducted in three different work packages, system understanding to buildknowledge of how the carburetor operates, fault finding to seek potential attributes that canaffect the stability and fault mode analysis to seek why the attributes affect the stability.Furthermore, all the attributes found has been tested and validated on the engine to seek theircontribution to the stability.The conclusion made of the thesis is that with simple and implementable improvements of thecarburetor the engine stability could be increased with 40 %. A total of five differentattributes were found to affect the stability of the engine. Furthermore, a very detailedexplanation of how the carburetor operates and components inside the carburetor has beenestablished during the thesis.

  • 2.
    Mattsson, Alexander
    Halmstad University, School of Business, Engineering and Science, Mechanical Engineering and Industrial Design (MTEK).
    Beräkningoptimering och konceptuell design avIndustriskydd2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    ABSTRACTAs the industry becomes more efficient all the time and the budgets narrower the demand forsafety equipment has also increased to minimize downtime and injuries. With the efficienciesgrowing in Swedish industry the supplier of this project has also seen an increased demand forsafety equipment. One product that has increased is their “Industryprotection” a productcreated to protect forklifts from colliding with walls in industry spaces.The purpose of this project is to generate a concept for a new design of the“Industryprotection”. It also involves creating a static FEM analysis of a collision between aforklift and the “Industryprotection”. The goal for the analysis is to create a steady modelwhich easily could be applied to different concepts. A study of the different calculationsmethods will also be executed.The project is split into two phases one conceptual phase and one calculation phase, the laststep of the project is to analyze the recommended concept versus the current one using theanalysis created.The work is limited to only go as far as a recommended concept is created, the dimensioning,final drawing, manufacturing preparation and validating is given to the supplier of the projectThe theory for this project is gathered from studying literature from market evaluation,computer aided calculation and design process. After theory for each phase of the project hasbeen gathered they have been modified to suit the phase. Also a large study of everyparameter in the FEM analysis has been executed to secure a stable model for the analysis.The output of the model became a simple and steady model which easily could be applied todifferent concepts. The study of different calculation methods of the model generated a fivetime increase of the amount of momentum the “Industryprotection” could endure.

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