Sökning: "Acoustic Emission"

Visar resultat 16 - 20 av 35 uppsatser innehållade orden Acoustic Emission.

  1. 16. Robot Condition Monitoring : A first step in Condition Monitoring for robotic applications

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Hugo Danielson; Benjamin von Schmuck; [2017]
    Nyckelord :Robot Condition Monitoring; Acoustic Emission; Hypocycloid; Gearbox; Nabtesco; SKF; ABB IRB6600; Vibration; Cepstrum; Pre-Whitening; Wavelet;

    Sammanfattning : The industrial world is in constant demand for faster, cheaper and higher quality manufacturing. Robot utilisation and automation has evolved to become a necessary asset to master in order to stay competitive in the global market. With the growing dependency on robots, unexpected downtime and brakedowns can cause devastating loss of revenue. LÄS MER

  3. 17. Designing, building and validating a test rig to measure two-port data of small fans

    Master-uppsats, KTH/MWL Marcus Wallenberg Laboratoriet

    Författare :Emil Garnell; [2017]
    Nyckelord :;

    Sammanfattning : There is a great need in the industry for measurement methods to characterize acoustic sources in ducts. One way to obtain a complete description of a source is to measure 2-port data, comprising of the source scattering matrix and the source vector. The resulting model can then be used to predict the source properties, e.g. LÄS MER

  4. 18. Master thesis within light warhead for support weapon : Investigation of defects, methods and requirement specifications in order to get a shell body shatter free

    Master-uppsats, Karlstads universitet/Avdelningen för maskin- och materialteknik

    Författare :Adam Jansson; [2016]
    Nyckelord :warhead; support weapon; shell body; shatter free; defect; method; carbon fibre; epoxy; crack; delamination; porosity; CFRP; CFRE; NDT; verkansdel; understödsvapen; granathylsa; splitterfri; defekt; metod; kolfiber; epoxi; spricka; delaminering; porositet; OFP;

    Sammanfattning : At launching the shell body, especially the backplane of the shell body, will be exposed to very high stresses due to acceleration, pressure and increased temperature from the propellant combustion. Defects in the shell body could in worst case for example result in high temperature gas leakage into the warhead and thereby ignite the explosives before exiting the launcher. LÄS MER

  5. 19. Implementation of Aeroacoustic Methods in OpenFOAM

    Master-uppsats, KTH/MWL Marcus Wallenberg Laboratoriet

    Författare :Erika Sjöberg; [2016]
    Nyckelord :;

    Sammanfattning : A general method is established for external low Mach-number flows where aeroacoustic analogies are used to decouple the sound generation from the sound propagation. The CFD solver OpenFOAM is used to compute the flow induced sound sources and Ffowcs-Williams and Hawkings acoustic analogy is implemented to calculate the propagation of sound. LÄS MER

  7. 20. Acoustic emission methods in fatigue testing

    Master-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Axel Lison Almkvist; [2015]
    Nyckelord :Acoustic emission; AE; grey iron; CFRP; Akustisk emission; AE; gråjärn; CFRP;

    Sammanfattning : Acoustic emissions are small vibration pulses, elastic waves, emitted from damage processes such as crack growth inside a material. Acoustic emission (AE) is also the name of the test method in which theses emissions are recorded and analysed and the method is used in materials research and the testing and inspection of structures. LÄS MER