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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 341 to 350 of 2104 (0.021 seconds)| 341 |
Robotic pipe inspection : system design, locomotion and controlBlyth, William Alexander January 2017 (has links)
The structural integrity of an industrial plant is a key safety and economic consideration for operators in many sectors including: power generation, oil and gas and petrochemical. To ensure safe operation, the plant often undergoes scheduled inspection using Non-Destructive Testing (NDT) methods to detect, size and locate defects such as cracks in welds or corrosion, with the accuracy and repeatability of inspections being critical to monitoring defect growth. Considering the significant cost of plant downtime for inspection, there is an economic benefit to be gained by increasing the speed of inspections, alongside reducing access requirements. Robotic NDT aims to address some of these issues, with an increase in inspection speed, repeatability and accuracy, and the added potential to remove human operators from hazardous environments. Conventional mobile climbing robots are limited by their manoeuvrability, with lateral drift, gravitational effects and continuous motion being particular issues that remain challenging in the context of complex geometries. This thesis aims to investigate the potential for enhanced mobility in mobile climbing robots to precisely follow inspection paths on cylindrical surfaces in various orientations, without drift. This has been done through the development of a reduced actuation mecanum wheel platform, using magnetic adhesion and external position encoding, allowing full translational motion whilst using kinematic and geometric constraints to prevent rotation. Through dynamic modelling of the platform, a model based control structure has been synthesised, allowing for improved consistency of performance in all orientations. The platform has been applied to representative inspection paths and used to conduct ultrasonic inspection of test samples, with the capability to correct for lateral drift and cover large inspection areas, improving the inspection accuracy and area coverage over conventional systems, without requiring operator intervention.
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Sulphur lubricant additives for oils and emulsionsYahagi, Y. January 1979 (has links)
No description available.
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The atomization of non-Newtonian fluidsGibbs, P. C. January 1982 (has links)
No description available.
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| 344 |
A prediction method for fires in roomsBagnaro, M. A. January 1983 (has links)
No description available.
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| 345 |
Temperature effects in the fatigue behaviour of a cast Al-Si alloyBalthazar, J. C. January 1983 (has links)
No description available.
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| 346 |
Flows in a model furnace and heat exchangerFounti, M. January 1983 (has links)
No description available.
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| 347 |
A study of natural gas and pulverized coal diffusion flamesHassan, M. M. A. January 1983 (has links)
No description available.
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| 348 |
Computational studies of materials under cyclic plasticityOloyede, Vincent Olayinka Adekunle January 1986 (has links)
No description available.
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| 349 |
Finite element solutions to elastostatic non-conforming contactsOnwordi, I. C. January 1986 (has links)
No description available.
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| 350 |
Time-dependent phenomena in uPVCEurtivong, Chalasai January 1988 (has links)
No description available.
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