Sökning: "Nondestructive Evaluation"

Visar resultat 6 - 10 av 17 avhandlingar innehållade orden Nondestructive Evaluation.

  1. 6. Ultrasonic NDT in Defect Detection - Mathematical modelling

    Författare :Håkan Wirdelius; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; crack; null field approach; transducers; optimisation; ultrasonics; elastic waves; nondestructive testing; T matrix method; inverse problem;

    Sammanfattning : This thesis is concerned with the mathematical modelling of the ultrasonic nondestructive testing situation. The first part of the thesis treats a simplified model of an ultrasonic transducer and its implementation into a T-matrix method-based solution to a crack scattering problem. LÄS MER

  3. 7. Structural health monitoring of concrete structures using diffuse waves

    Författare :Patrik Fröjd; Teknisk geologi; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; övervakning; ultraljud; betong; diffusa vågor; oförstörande provning; structural health monitoring; ultrasound; concrete; nondestructive testing; Civil engineering; diffuse waves;

    Sammanfattning : The work presented in this thesis has aimed to investigate and implement techniques for ultrasonic measurements in structural health monitoring applications for civil structures. The focus of the work has been to make these systems practical in real applications, where the large size of the structures, and the changing environments they are exposed to, pose problems for many methods which otherwise fare well in laboratory settings. LÄS MER

  4. 8. Image based methods for nondestructive detection of compression wood in sawn timber

    Författare :Jan Nyström; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Träteknik; Wood Technology;

    Sammanfattning : Compression wood is an anomaly in wood formed by the living softwood tree to compensate for excessive, asymmetric loads by developing special fibres. Compression wood has special properties that are unwanted in the utilisation of sawn wood products and is thus desirable to detect and reject in an early stage. LÄS MER

  5. 9. Remote Acoustic Characterization of Thin Sheets

    Författare :Etienne Mfoumou; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Remote acoustic excitation; material characterization; acoustic NDT; vibration-based technique; sheet material evaluation; fracture toughness.;

    Sammanfattning : There is a need to monitor the existence and effects of damage in structural materials. Aircraft components provide a much publicized example, but the need exists in a variety of other structures, such as layered materials used in food packaging industries. LÄS MER

  7. 10. Nuclear safeguards evaluation and analysis techniques for application to nuclear fuel material in Generation IV nuclear energy systems

    Författare :Matilda Åberg Lindell; Sophie Grape; Ane Håkansson; Peter Andersson; Juhani Hyvärinen; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fysik; Physics;

    Sammanfattning : A new generation of nuclear energy systems called Generation IV is under development to ensure that nuclear power will be a safe, reliable and sustainable energy source for the future. This thesis addresses the challenge of making future nuclear energy systems increasingly resistant to nuclear material diversion attempts. LÄS MER