Search for dissertations about: "Electric arc"

Showing result 1 - 5 of 35 swedish dissertations containing the words Electric arc.

  1. 1. Modelling of Electric Arc Welding arc-electrode coupling

    University dissertation from Gothenburg : Chalmers University of Technology

    Author : Alireza Javidi Shirvan; Högskolan Väst.; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Manufacturing and materials engineering; Produktions- och materialteknik; electric welding; arc welding simulation; electrode; plasma; cathode layer; sheath; arc discharge;

    Abstract : Arc welding still requires deeper process understanding and more accurateprediction of the heat transferred to the base metal. This can be provided by CFD modelling.Most works done to model arc discharge using CFD consider the arc corealone. READ MORE

  2. 2. Modelling of cathode-plasma interaction in short high-intensity electric arc Application to Gas Tungsten Arc Welding

    University dissertation from Göteborg : Chalmers University of Technology

    Author : Alireza Javidi Shirvan; Högskolan Väst.; [2016]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik; Electric arc discharge; sheath; pre-sheath; Knudsen layer; doped refractory cathode; arc-cathode coupling; Gas Tungsten Arc simulation; OpenFOAM.; electric arc discharge;

    Abstract : In arc welding the quality of the weld is strongly influenced by the thermal history of the workpiece which is itself governed by the electric arc heat source. The models for predicting weld properties thus need a good evaluation of the distribution of the heat input from thearc to the workpiece. READ MORE

  3. 3. Electric arc-contact interaction in high current gasblast circuit breakers

    University dissertation from Stockholm : Mekanik

    Author : Torbjörn Nielsen; KTH.; [2001]
    Keywords : Electric arc; Contact evaporation; Near cathode region; Metal particles; CFD; Computational fluid dynamics; MHD; Magnetohydrodynamics;

    Abstract : .... READ MORE

  4. 4. Auroral Electric Fields From Satellite Observations and Numerical Modelling

    University dissertation from Stockholm : KTH

    Author : Tomas Karlsson; KTH.; [2001]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Satellite measurements; electric fields; ionosphere; magnetosphere; diverging electric fields; downward current region; black aurora; westward travelling surge; auroral bulge; subauroral ion drifts SAID ; subauroral electric fields SAEF ; mid-latit; TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : This thesis is about electrodynamics of thehigh-latitude/auroral region of near-Earth space. The work ismainly based on electric field measurements made by the doubleprobe instrument on the Freja satellite at altitudes ofapproximately 800-1700 km, together with measurements fromother instruments on the same satellite, and ground-basedinstrumentation. READ MORE

  5. 5. On the polymer-based nanocomposites for electrical switching applications

    University dissertation from Stockholm, Sweden : KTH Royal Institute of Technology

    Author : Venkatesh Doddapaneni; KTH.; [2017]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymer-based nanocomposites; Inorganic nanoparticles; Electrical arcs; Circuit breakers; Ablation Outgassing; Arc interruption capability; PMMA; CuO; Fe3O4; ZnO; Au; Radiative energy; Electric power; Arc temperature.; Physics; Fysik;

    Abstract : Recent research demonstrated that polymer based nanocomposites (PNCs) have been engineered in order to improve the arc interruption capability of the circuit breakers. PNCs are the combination of nano-sized inorganic nanoparticles (NPs) and polymers, opened up new developments in materials science and engineering applications. READ MORE