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.
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Showing 1 to 20 of 36 for “"nondestructive evaluation (NDE)"”.
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Implementation of Infrared Non-Destructive Evaluation in Fiber-Reinforced Polymer Bouble-Web I-Beams
… only short-term proof testing for validation. Nondestructive evaluation (NDE) is a way to implement health monitoring of the bridge beams and needs to be assessed. The principal underlying infrared thermal imaging (IR) nondestructive evaluation (NDE) is to induce a thermal gradient in the beam …
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Nondestructive evaluation of composite rods using ultrasonic wave propagation
Nondestructive Evaluation (NDE) is a branch of applied science that is concerned with assessing the properties and serviceability of materials and structures without causing collateral damage or depreciation. This study presents a detailed analysis of advanced composite rods (comprised of two or …
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Active Magnetic Bearings used as an Actuator for Rotor Health Monitoring in Conjunction with Conventional Support Bearings
… a spinning. Similar to modal analysis and other nondestructive evaluation (NDE) techniques which apply input signals to static structures in order to monitor responses; this approach allows for the measurement of both input and output response in a rotating system for evaluation. However, unlike …
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Data fusion techniques for nondestructive evaluation and medical image analysis
… of methods to perform data fusion for nondestructive evaluation (NDE) and medical imaging applications. The general framework for these applications includes region-of-interest (ROI) detection followed by feature extraction and classification of the detected ROI. Image processing …
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Adhesively bonded composite repairs in marine applications and utility model for selection of their nondestructive evaluation
… open literature base concerning adhesively bonded composite repairs, primarily originating from within the aerospace industry. Moreover, little work has been done toward the optimization of repairs on marine composite structures, despite a growing number of such applications. Few …
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Nondestructive Evaluation of Zirconium Phosphate Bonded Silicon Nitride Radomes
… shock capabilities. Zirconium phosphate bonded silicon nitride (Zr-PBSN), which has a low and thermally stable dielectric constant, high rain erosion resistance and a low-cost processing method, has been developed for radome applications in advanced tactical missiles. Pressureless sintering …
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The Effects of Carbon Fiber Misalignment on Composite Material Strength
<p>Nondestructive Evaluation (NDE) is an effective way for determining material properties. More specifically, ultrasonic waves along with visual measurements from a microscope can be used to systematically determine the elastic modulus of single ply composites that are subject to an altered …
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A "divide-and-conquer" strategy for NDE signal inversion in gas transmission pipelines
<p>Signal inversion in nondestructive evaluation (NDE) applications is a critical step before remediation decisions are made. The accuracy and confidence of the signal inversion results therefore play a key role in evaluating the effectiveness of the NDE procedure. Conventional NDE signal inversion …
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Performance simulation of a composite orthopedic implant device
… performance of composite hip prostheses under complex mechanical and environmental loading conditions are studied through theoretical modelling and experimental investigations. Two static strength models, namely, a cantilever beam model and an elastic foundation model, were developed using …
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Multi-sensor data fusion using geometric transformations for the nondestructive evaluation of gas transmission pipelines
<p>Nondestructive evaluation (NDE) plays a vital component in the operation and maintenance of large infrastructure such as gas transmission pipelines, nuclear power plants, aircraft, bridges and highways, etc. As this infrastructure continues to age it is essential that the inspection techniques …
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Study Of Chaotic Ultrasound And Frequency Sweep Excitations In Sonic Ir Nde Technology
<p>Sonic Infrared (IR) Imaging Nondestructive Evaluation (NDE) technology has shown inherent advantages, such as fast detection for all direction and all dimension flaws, for both metal and composite materials. The purpose of this dissertation is to study and investigate the physical process of two …
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Nondestructive evaluation for hybrid-composite girder bridges
… that may occur during concrete placement can go undetected. The research to be presented is focused on the application of nondestructive evaluation (NDE) technologies of thermography, ultrasonic testing, and acoustic emission testing to assess the quality of placement within the arch section of …
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An invariance transformation algorithm for defect characterization of ultrasonic signals for the nondestructive evaluation of concrete
<p>Nondestructive evaluation (NDE) techniques offer cost-effective strategies for monitoring the integrity of a variety of civil infrastructure, such as natural gas and sewer pipelines, without the need to take the system off-line. However, interpretation of NDE signals in terms of the location, …
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Optimized techniques for real-time microwave and millimeter wave SAR imaging
… radar (SAR)-based imaging techniques, used for nondestructive evaluation (NDE), have shown tremendous usefulness for the inspection of a wide variety of complex composite materials and structures. Studies were performed for the optimization of uniform and nonuniform sampling (i.e., measurement …
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Robotic Inspection and Data Analytics to Localize and Visualize the Structural Defects of Civil Infrastructure
… Penetrating Radar (GPR) serves as a significant nondestructive evaluation (NDE) technique to inspect and survey underground objects (e.g., rebars, utility pipes) in complex urban environments. In addition to GPR, visual-based surface defect detection plays a crucial role in assessing and …
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Impedance-based Nondestructive Evaluation for Additive Manufacturing
Impedance-based Non-Destructive Evaluation for Additive Manufacturing (INDEAM) is rooted in the field of Structural Health Monitoring (SHM). INDEAM generalizes the structure-to-itself comparisons characteristic of the SHM process through introduction of inter-part comparisons: instead of comparing …
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Inspection of Flexible Fillers in Post-Tensioned Bridges
… being used in new bridges, FDOT needs effective nondestructive evaluation (NDE) methods to employ in their biennial inspections. There are currently numerous NDE methods available to inspectors that have been used to identify defects in PT bridges that use CG, but the NDE methods identified in …
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Develop Sonic Infrared Imaging Nde For Local Damage Assessment In Civil Structures
<p>Nondestructive Evaluation (NDE) is an interdisciplinary field of study, which is concerned with the development of analysis techniques and measurement technologies for the quantitative characterization of materials, tissues and structures. Ultrasonic IR Imaging is a novel NDE technique, which …
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A process and investigation into the influence of cast surface condition on fatigue life
… this research aims to draw connections between nondestructive evaluation (NDE) techniques and fatigue results of cast test specimens. A process of specimen manufacturing, processing, and inspection is presented in this research, along with fatigue testing results. It is known that poor surface …
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Influence of antenna pattern on synthetic aperture radar (SAR) imaging and complex permittivity extraction from images of multilayered media
… (SAR) imaging technique has been widely used for nondestructive evaluation (NDE) applications. To evaluate the performance of a SAR imaging system, factors including image production time, image quality, and capability to get quantitative information from a produced SAR image are commonly …
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