Sökning: "ultrasonic waves"

Visar resultat 11 - 15 av 35 avhandlingar innehållade orden ultrasonic waves.

1. 11. Lamb wave evaluation of concrete plates

   Författare :Oskar Tofeldt; Teknisk geologi; []
   Nyckelord :Lamb waves; guided waves; impact-echo; concrete; non-destructive evaluation;

   Sammanfattning : This thesis is about the application of Lamb waves for non-destructive evaluation of plate-like concrete structures under one-sided access test condition using a portable equipment consisting of an accelerometer and impact hammer. With this type of equipment and based on array signal processing, the impact-echo (IE) method can be extended with measurements of surface waves; this extension allows an evaluation with Lamb waves. LÄS MER

3. 12. On-chip Ultrasonic Sample Preparation

   Författare :Ida Sadat Iranmanesh; Martin Viklund; Johan Nilsson; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ultrasound; Sample preparation; Particle manipulation; Fysik; Physics; Biological Physics; Biologisk fysik;

   Sammanfattning : Acoustofluidics has become a well-established technology in the lab-on-a-chip scientific community. The technology involves primarily the manipulation of fluids and/or particles in microfluidic systems. LÄS MER

4. 13. Surface Wave Testing of Pavements

   Författare :Nils Rydén; Teknisk geologi; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; geographical and geological engineering; Hydrogeologi; teknisk geologi; teknisk geografi; Hydrogeology; inversion; guided waves; road; pavement; Surface waves; non-destructive testing;

   Sammanfattning : A novel approach for surface wave testing of pavements is presented. It is a non-destructive testing (NDT) technique that can be used to obtain the thickness and stiffness properties of the different layers in a pavement. LÄS MER

5. 14. Elastic wave scattering from corrugated surfaces in anisotropic media

   Författare :Tatiana Krasnova; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; corrugated surface; perturbation approach; scattering; anisotropy; ultrasonic waves; null field approach; integral equation; Green s function;

   Sammanfattning : .... LÄS MER

7. 15. Modelling of ultrasonic testing for cracks near a non-planar surface

   Författare :Jonathan Westlund; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ultrasonics; BIEM; Elastic waves; Nondestructive testing; Crack; BEM.;

   Sammanfattning : Nondestructive testing using ultrasound has important applications in e.g. the nuclear power and aerospace industries, where it is used to inspect safety-critical parts for flaws. LÄS MER