Sökning: "percussive"

Visar resultat 1 - 5 av 13 uppsatser innehållade ordet percussive.

  1. 1. Innerytans inverkan på utmattningshållfasthet i bergborrstänger

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Tillämpad materialvetenskap

    Författare :Erik Hållström; [2022]
    Nyckelord :Top hammer drill; Surface roughness; Flush hole; Material fatigue; Topphammarborr; Materialutmattning; Spolhål; Ytjämnhet;

    Sammanfattning : Top hammer drilling uses a percussive force at the top combined with a rotational energy that transmits through a rod to a drill bit that crushes rock. It is a drilling method that is preliminary used in mining, construction and operations under ground. Fatigue strength plays an important role in the drill rods life span. LÄS MER

  3. 2. Identification and strength classification of weakness zones in the Garpenberg mine based on measurement while drilling (MWD)

    Master-uppsats, Luleå tekniska universitet/Geoteknologi

    Författare :Ioannis Peroulakis; [2022]
    Nyckelord :Drilling; MWD; Garpenberg; Mining; Geotechnics;

    Sammanfattning : Boliden’s Garpenberg mine produces Zn-Pb-Ag(Cu-Au) using a sublevel stoping with pastefill mining method. The orebody is strongly affected by the existence of weakness zones mainly consisting of Talc Schist and Phlogopite Schist which affect the design, planning and production of the stope. LÄS MER

  4. 3. Identifying Important Features to Minimize Hole Deviation in Percussive Drilling

    Master-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Ketan Dhananjay Deshpande; [2021]
    Nyckelord :Bending; Buckled profile; Drilling; Hole deviation; Mathematical model; Böjning; Buckled profil; Borrning; Hålavvikelse; Matematisk modell;

    Sammanfattning : Hole deviation is one of the most significant problems in drilling applications. Deviated holes result in inefficient blasting and have severe economic impacts due to increased equipment consumption. Conversely, straighter holes help in increasing production scales and reduce operational costs. LÄS MER

  5. 4. Welfare Evaluation of Stunning Practices for Farmed Fish in the European Union

    Magister-uppsats, Linnéuniversitetet/Institutionen för biologi och miljö (BOM)

    Författare :Rickard Barkerud; [2021]
    Nyckelord :farmed fish; stunning methods; fish welfare; welfare indicators; stress responses; aquaculture;

    Sammanfattning : An optimal method for stunning animals before slaughter should result in instantaneous and irreversible insensibility. Today, there are various stunning and slaughter practices used around the world for farmed fish. LÄS MER

  7. 5. Cavitation analysis on test rig. : An experimental and CFD study executed in collaboration with Epiroc AB

    Master-uppsats, Umeå universitet/Institutionen för tillämpad fysik och elektronik

    Författare :Oskar Kuoppala; [2021]
    Nyckelord :CFD; Cavitation; Water Hammer;

    Sammanfattning : This master thesis project was done in collaboration with Epiroc Group Ab. Epiroc supplies high-quality drills of various types that can be used both above and below ground. A major problem in their percussive rock drills is that that cavitation is formed. Cavitation is a phenomenon that occurs when a fluid is subject to a sudden pressure drop. LÄS MER