Sökning: "Oblique impact"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden Oblique impact.

  1. 1. Head impact detection with sensor fusion and machine learning

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Författare :Aron Strandberg; [2022]
    Nyckelord :head impact detection; sensor fusion; 3D; machine learning; support vector machine; random forests;

    Sammanfattning : Head injury is common in many different sports and elsewhere, and is often associated with differentdifficulties. One major problem is to identify and value the injury or the severity. Sometimes there is no sign of head injury, but a serious neck distortion has occurred, causing similar symptoms as head injuries e.g. LÄS MER

  3. 2. Evaluation of Coefficient of Friction in Oblique Helmet Impacts: An Experimental and Numerical Study

    Master-uppsats, KTH/Hållfasthetslära

    Författare :Philip Singh; [2022]
    Nyckelord :FE model; friction; helmet impact; LS-DYNA; FE-modell; friktion; hjälmislag; LS-DYNA;

    Sammanfattning : The focus of this thesis was to increase the knowledge in the area of "dynamic friction" during oblique helmet impacts, both experimentally and numerically. Physical experiments have been performed with multiple helmets, different angles of the anvil and different surface materials, with results of impact forces from the anvil and accelerations of the head. LÄS MER

  4. 3. Utvärdering av höjdosäkerhet i digital terrängmodell framtagen med fotografier infångade med DJI Phantom 4 RTK

    Kandidat-uppsats, Högskolan i Gävle/Samhällsbyggnad

    Författare :Maya Bååth; Frida Jonsson; [2020]
    Nyckelord :Fotogrammetri; Digital höjdmodell; UAS; NRTK-UAS; Mätosäkerhet; Punktmoln;

    Sammanfattning : Att använda obemannade flygfarkoster, även kallat UAS (unmanned aerial systems), i karterings- och modelleringssyften har blivit en välanvänd metod de senaste åren. Mycket på grund av den tekniska utvecklingen som till stor del automatiserat processen med att framställa höjdmodeller och ortofoton. LÄS MER

  5. 4. Semantic Segmentation of Oblique Views in a 3D-Environment

    Master-uppsats, Linköpings universitet/Datorseende

    Författare :Victor Tranell; [2019]
    Nyckelord :Semantic segmentation; 3D segmentation; oblique views; multiview segmentation; satellite imagery; convolutional neural networks;

    Sammanfattning : This thesis presents and evaluates different methods to semantically segment 3D-models by rendered 2D-views. The 2D-views are segmented separately and then merged together. LÄS MER

  7. 5. Evaluation of Test Methods for Football Helmets Using Finite Element Simulations

    Master-uppsats, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Aðalheiður Gunnarsdóttir; [2019]
    Nyckelord :Concussion; Football Helmets; Test methods; FE simulations;

    Sammanfattning : Introduction: Concussions in American Football are of a major concern due to highly reported injury rates. The importance of properly designed helmets have shown effect in reducing the risk of injuries, such as skull fractures. However, they are not as effective in reducing the risk of concussion. LÄS MER