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 40 for “"Non-Destructive Evaluation (NDE)"”.
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Design of miniature mobile robots for non-destructive evaluation
… or are hazardous for humans. In particular, the evaluation of complex infrastructures that consist of numerous components with small structural dimensions motivate the application of robotic micro systems for inspection and on-site manipulation. This thesis describes the development of a …
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Robotic Platform for Internal Inspection
… UGV that has been developed for the purpose of non-destructive evaluation (NDE) and internal inspection of environments where human penetration may be difficult or hazardous. Various NDE and sensing techniques are described in this paper but the focus is on the mechanical and electrical design …
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The effect of microstructure on the fatigue and fracture properties of vintage power rotor steels
… of normal maintenance, a periodic inspection by non-destructive evaluation (NDE) is performed to determine if flaws have developed, or progressed from pre-existing conditions, that exceed safe limits for operation. In 2008, after over fifty years of service at a power plant and at Alcator, the …
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Development of a generalized fatigue assessment approach for steel castings.
… indication size using an industry accessible non-destructive evaluation (NDE) technique, such as phased array ultrasonic testing (PAUT), correlated to the proposed lower limits of the LEFM fatigue design approach.
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Machine learning-based non-destructive evaluation of fatigue damage in metals
Non-destructive evaluation (NDE) of fatigue damage in metals is crucial for ensuring high product performance and safety. In remanufacturing, NDE for the incoming recycled metal materials is also essential to maximize the benefits of utilizing such materials. However, critical challenges exist in …
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A Barkhausen Noise Testing System for CANDU Feeder Pipes
… noise (BN) testing system was developed for the non-destructive evaluation (NDE) of residual stresses in CANDU reactor feeder pipes. The system consists of a four-channel arbitrary waveform flux control system (FCS), and the spring-loaded tetrapole prototype (SL4P) BN probe. The combination of …
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Non-Destructive Bridge Deck Condition Assessment with a Probability-Based Deterioration Threshold
… agencies across the country. In past decades, Non-Destructive Evaluation (NDE) techniques, capable of detecting various deteriorations types, e.g., cracking, delamination and reinforcing steel corrosion, have emerged. These techniques generate large amounts of data representing different …
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The Economy of Preventive Maintenance of Concrete Bridges Due to Corrosion
<p>The current practice for physical evaluation and delayed maintenance of deteriorated concrete bridge is fundamentally wrong. This research presents a new approach for the evaluation of the condition states of steel reinforced concrete bridge members, which is based on their chemical conditions …
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Investing in quality : identifying the true value of advanced weld inspection technology
… the inherently variable nature of arc welding, non-destructive weld evaluation is critical to ensure that welding processes remain in control, and that defective parts are quarantined and repaired before being released downstream. The "conventional" ultrasonic weld inspection technology in use …
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Assessment of FRP-confined concrete : understanding behavior and issues in nondestructive evaluation using radar
… piers has urged the development of' an effective non-destructive evaluation (NDE) methodology. Radar technologies have shown great potential for assessing the structural and material integrity of FRP-confined concrete systems. In developing such technology, an interdisciplinary approach must be …
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Machine-Learning-Based Non-Destructive Evaluation of Refractory Anchor Welds via Analysis of Percussion-Induced Acoustic Signals
… but traditional inspection methods are often destructive, time-consuming, or limited in accuracy. This thesis investigates a novel non-destructive evaluation (NDE) technique that leverages machine learning (ML) and percussion-induced audio analysis to assess weld quality. A custom weld plate …
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Inverse Volume-of-Fluid Meshless Method for Efficient Non-Destructive Thermographic Evaluation
… potential of the multi-dimensional high-fidelity non-destructive evaluation (NDE) method.</p>
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Towards structural health monitoring in carbon nanotube reinforced composites
An experimental investigation was conducted to understand the non-destructive evaluation (NDE) capabilities of carbon nanotubes (CNTs) of several network architectures towards structural health monitoring (SHM). As heterogeneous composite structures become increasingly common in industry, detecting …
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Crack Detection in Aluminum Structures
… the structure. This also fits the description of non-destructive evaluation (NDE). The main difference is that NDE takes place while the structure is out of service and SHM is intended to take place while the structure is in service. As such, SHM provides the opportunity to provide early warning …
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INTELLIGENT NON-DESTRUCTIVE EVALUATION EXPERT SYSTEM FOR CARBON-CARBON COMPOSITES USING THERMOGRAPHY, ULTRASONICS, AND COMPUTED TOMOGRAPHY
This study develops a reliable intelligent non-destructive evaluation (NDE) expert system for carbon-carbon (C/C) composites based on thermography, ultrasonic, computed tomography and post processing by means of fuzzy expert system technique. Data features and NDE expert knowledge are seamlessly …
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Design and Calibration of a RF Capacitance Probe for Non-Destructive Evaluation of Civil Structures
… by the time deterioration becomes evident. Non-destructive evaluation (NDE) methods are potentially among the most useful techniques developed for assessing constructed facilities. They are noninvasive and can be performed rapidly. Portland cement concrete can be nondestructively evaluated …
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Ultrasonic sensor platforms for Non-Destructive Evaluation
… are receiving increasing attention for use in Non-Destructive Evaluation (NDE), due to their attractiveness in terms of cost, safety and their accessibility to areas where manual inspection is not practical. A reconfigurable Lamb wave scanner, using autonomous robotic platforms is presented. …
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An integrated framework for finite element modelling of ultrasonic inspections of carbon fibre reinforced polymer components
… materials pose a challenge for ultrasonic Non Destructive Evaluation (NDE) inspections due to their anisotropic material properties and often complex morphology.This Thesis develops an integrated framework to allow for accurate Finite Element Analysis (FEA) simulations of CFRP components to …
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Silence of the lamb waves
… substrates. Contact (transducer-based) and non-contact (photoacoustic) generation methods along with deterministic and probabilistic tomographic reconstruction algorithms were implemented evaluate their suitability for non-destructive evaluation (NDE) and in-line control of surface additions …
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Understanding Magnetic Flux Leakage from Gouges and Dents Containing Gouges
… flux leakage (MFL) is the most widely used non-destructive evaluation (NDE) technique for operating gas and oil transmission pipelines. The Queen’s Applied Magnetics Group (AMG) has been studying MFL signals from dents for the past 5 years, and recently began considering MFL signals from …
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