Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Ultrasonic Inspection"”.
-
Signal processing techniques for ultrasonic inspection
… techniques. Special interest has been given to ultrasonic examination techniques and the problems encountered when they are applied to thick welded plates. Some suggestions are given using signal processing methods. Chapter 2 treats the need for nondestructive testing as seen in the light of …
-
Automated ultrasonic inspection of heat exchanger tubesheets welds
… integrity of these welds before commissioning. Inspection methods available for the inspection of the welds were limite9 to manual techniques. This proved to be very labour intensive, leading to operator fatigue. Furthermore, the interpretation of the results from the inspection equipment was …
-
Development of an automated ultrasonic inspection cell for detecting subsurface discontinuities in cast iron
1 PDF file (vi, 116 pages)
-
Ultrasonic inspection methods for defect detection and process control in roll-to-roll flexible electronics manufacturing
… materials to test their suitability at launching ultrasonic Lamb waves along Polyethylene Terephthalate (PET) film. Using hydrogel wedges, the fundamental antisymmetric (Ao) Lamb wave mode was successfully propagated a distance of 2 cm. ABS wedges were found to initiate longitudinal waves, which …
-
Multi-objective combinatorial optimization problems in transportation and defense systems
… of systems architecting and railroad track inspection scheduling. In particular, multi-objective system of systems architecting problems with system flexibility and performance improvement funds have been investigated. Efficient solution methods are proposed and evaluated for not only the …
-
Development of optical fiber laser array method for assessing quality of chip packages
… focuses on the development of an improved laser ultrasonic inspection system for quality evaluation of microelectronic packages of all sizes. This new system uses an optical fiber array consisting of two optical fiber probes, instead of the single fiber probe used in the original inspection …
-
Monte Carlo solution to the inverse problem of ultrasonic defect characterisation
… parameters of flaw captured in pulse-echo ultrasonic inspection data for immersion testing at low angles of incidence is treated as an inverse problem, formulated in terms of directly recovering the underlying physical description of the defect. The forward problem of modelling the …
-
Closure integrity testing of heat sealed aseptic packaging using scanning acoustic microscopy
… was to determine the possible application of ultrasonic inspection for non-destructive, online evaluation of the integrity of heat sealed, flexible package structure commonly used in packaging of aseptic and shelf-stable food products. A scanning acoustic microscope (SAM), Olympus UH-3, and …
-
A STUDY OF THE THERMAL CYCLING PERFORMANCE OF SOLDER JOINTS IN AREA ARRAY PACKAGING
… reliability of electronic components involve the inspection of solder joints in area array packaging. It is of note that solder interconnections are the vulnerable parts of circuit board assemblies (CBA), because they are mainly subjected to various assembly process during electronic manufacturing …
-
Delamination in fiberglass pre-impregnated laminated composites from ultrasonic a-scan signal using artificial intelligence
… of IID using artificial neural network from ultrasonic signal has great potential to be applied, but no attempt has been made to detect and classify this failure mode in FGLC material. The classification of delamination against impact not only applicable as prediction tool to characterise the …
-
Autonomous unmanned aerial vehicle for non-destructive testing
… and the ability to access areas where manned inspection is not practical. The mobility and size of UAVs offer the flexibility to quickly deploy remote inspections of large-scale assets and targets with complex geometry, such as wind turbine blades. The platform also provides airborne …
-
Detection and assessment of wood decay – glulam beams and wooden utility poles
… report documents the development of acoustic and ultrasonic inspection methods on wooden glulam beams and utility poles. All beams and poles examined where composed of Douglas-fir. The report begins with a description of the structure of trees, the mechanical behavior of wood subjected to rot, and …