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 12 of 12 for “"Manufacturing defect"”.
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A multi-factor model for evaluating manufacturing defect opportunities in six sigma analysis
… Analysis provides a structured method for manufacturing quality problems and defect opportunities to be defined, measured, analyzed, improved, and controlled. The technique is now being widely used in both the manufacturing and service industries to evaluate the classical "defects per …
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Real-Time Thermography for In Operando Additive Manufacturing Defect Mitigation using a Machine Learning Approach
… Energy Deposition (DED), a subset of additive manufacturing, produces materials such as metal–matrix composites and functionally graded coatings by utilizing a concentrated high-power laser as the primary energy source. In spite of its benefits, DED continues to be confronted by process-induced …
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Characterization of sub-surface wrinkles within a laminated composite using a novel phased array ultrasonic scanning technique incorporating a portable nozzle and robotic arm.
… by the presence of out-of-plane wrinkles, a manufacturing defect that occurs in thick complex curvature composite stacks. This thesis presents an ultrasound scanning technique utilizing a novel phased array approach to detect out-of-plane wrinkles and, unlike previous literature results, …
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Damage development under compression-compression fatigue loading in a stitched uniwoven graphite/epoxy composite material
… was given to the effects of stitching-related manufacturing defects. Damage evaluation techniques included edge replication, stiffness monitoring, X-ray radiography, residual compressive strength, and laminate sectioning. It was found that the manufacturing defect of inclined stitches had the …
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Component-derived manufacturing yield prediction in circuit card design and assembly
Circuit card manufacturing can be a highly risky and volatile proposition due to the placement of hundreds of small, high value components. Operator mistakes, design errors, and defective parts lead to thousands of dollars in troubleshooting and rework costs per product. Raytheon Integrated Defense …
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Defect and fault tolerance techniques for nano-electronics
… nanotechnologies will be accompanied by high manufacturing defect rates and high operation-time fault rates. This thesis is concerned with developing defect and fault tolerance techniques to address low manufacturing yield due to permanent defects and reduced computational reliability due to …
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Effects of Defects on the Performance of Hierarchical Honeycomb Metamaterials Realized Through Additive Manufacturing
… cellular metamaterials, the only realistic manufacturing process is additive manufacturing (AM). The use of AM to manufacture large structures may lead to several types of defects during the manufacturing process, such as imperfect cell walls, irregular thickness, flawed joints, partially …
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Effects of Flow Control on the Aerodynamics of a Tandem Inlet Guide Vane
… suction-only values. This was attributed to a manufacturing defect which distorted the flow of the blowing jet. The results of the deviation-angle blowing experiments were not considered representative of the design intent and reinforced the importance of the hole design for creating a proper …
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Design and Analysis of Defect- and Fault-tolerant Nano-Computing Systems
… and molecular switches. One main problem in manufacturing defect-free nanodevices, both CMOS and non-CMOS, is the inherent variability in nanoscale fabrication processes. Compared to current CMOS devices, nanodevices are also more susceptible to signal noise and thermal perturbations. One …
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Multiscale finite element models for the analysis, design and optimisation of variable stiffness composites
L'abstract è presente nell'allegato / the abstract is in the attachment
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Influence of process parameters and manufacturing defects on the properties of thermoplastic composite pipes.
… industrial metallic pipes. However, during the manufacturing of TCP certain defects may be induced in it due to the effects of processing parameters and this can affect the performance of the pipe in the long run with induced defects leading into in-service failures. Among other factors in …
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Multi-classification and object detection in intelligent manufacturing
Defect detection in industries is typically conducted manually. While there are state-of-the-art machine vision techniques for automated inspection systems, there is still a gap between research advancement and practical applications, especially for manufactures with high volume and low margin. The …