Sökning: "lamb waves"

Hittade 5 uppsatser innehållade orden lamb waves.

1. 1. Application of Lamb waves using piezoelectric technique for structure health monitoring

   M1-uppsats, KTH/Hälsoinformatik och logistik

   Författare :Simon Mauritz; [2023]
   Nyckelord :Structural health monitoring SHM ; damage detection; Lamb waves; piezoelectric PZT ; printed circuit board PCB ; circuit simulation; Strukturell hälsoövervakning SHM ; skadedetektering; Lambvågor; piezoelektrisk PZT ; printed circuit board PCB ; kretssimulering;

   Sammanfattning : Structural health monitoring (SHM) is damage detection strategy for aerospace, civiland mechanical infrastructure. This project tries to show that Lamb waves, that are being generated and sensed with piezoelectric transducers, can be used for damage detection in a SHM system. LÄS MER

3. 2. Optical Fiber sensing of acoustic waves using overlapping FBGs

   Master-uppsats, Mittuniversitetet/Institutionen för elektronikkonstruktion

   Författare :Erik Lillebø Hole; [2019]
   Nyckelord :Ultrasonic; Optical Fiber Sensing; Fiber Bragg Grating;

   Sammanfattning : The objective of this thesis was to investigate if an optical fiber sensing method with the use of two overlapping fiber Bragg gratings to measure Lamb wave $S_0$ modes in a steel plate, and how it would compare to traditional PZT transducers. A solution was proposed where the use of an optical fiber sensing system was built and took advantage of the strain dependence of a fiber Bragg grating mounted to a steel plate. LÄS MER

4. 3. Structural Health Monitoring of Composite Fan Outlet Guide Vane : Detecting damages and impacts using piezoelectric wafer active sensors and Lamb waves

   Master-uppsats, KTH/Lättkonstruktioner

   Författare :Jonatan Palmquist; [2016]
   Nyckelord :;

   Sammanfattning : The use of composite materials within the aerospace industry has increased in the last decades and is still on the rise. Most composite applications are in the aircraft body parts but engine components such as fan blades and fan outlet guide vanes (FOGV) are now also to be found. LÄS MER

5. 4. Semi-Analytical Finite Element method for guided waves in civil engineering plate-like structures

   Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Teknisk geologi; Lunds universitet/Väg- och vattenbyggnad (CI)

   Författare :Christian Nielsen; [2015]
   Nyckelord :seismics; structural health monitoring; lamb waves; SAFE; semi analytical finite element; wave guide finite element; non destructive testing; civil engineering; ultrasound; ultrasonography; comsol; wave guide; plate; Technology and Engineering;

   Sammanfattning : Guided waves have a signicant potential for Structural Health Monitoring (SHM) and Non-Destructive Testing (NDT) due to their relatively long distance of propagation and sensitivity to discontinuities along the propagation path, anywhere through the material thickness. The inability to model wave guides of arbitrary cross-section using current matrix methods, has led to the development of a technique called Semi-Analytical Finite Element (SAFE). LÄS MER

7. 5. Numerical simulations of energy absorbing boundaries for elastic wave propagation in thick concrete structures subjected to impact loading

   Master-uppsats, Institutionen för fysik

   Författare :Daniel Olsson; [2012]
   Nyckelord :Numerical simulations; elastic media; wave propagation; concrete; impact loading; energy absorbing boundaries; longitudinal; primary wave; secondary wave; shear; Rayleigh damping; Rayleigh wave;

   Sammanfattning : As many of the world’s nuclear power plants are near the end of their supposed life span a need arise to assess the components crucial to the safety of these plants. One of these crucial components is the concrete reactor confinement; to assess its condition, non-destructive testing (NDT) is an attractive method. LÄS MER