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 74 for “"Thermal Loads"”.
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Effects of thermal loads on Texas steel bridges
The effects of thermal loads on steel bridges are not well understood. Although thermal effects are discussed in the AASHTO specifications, the appropriateness of the recommended thermal gradients is questionable. Thermal effects on the bridges can impact the design of the steel superstructure, the …
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Changes in Stormwater Thermal Loads Due to Bioretention Cells
… surfaces temperatures, and then transfer this thermal energy to runoff during a rainfall event, resulting in higher runoff temperatures. Bioretention cells are a common stormwater control practice identified as a possible thermal mitigation practice in urban watersheds harboring cold-water fish …
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Stress Changes in Railroad Car Wheels Due to Axially Symmetric Thermal Loads
… free wheels subjected to axially symmetric thermal loadings. Residual stress levels after final cooling of the wheels is determined by a sectioning technique. Results from the tests are compared to predictions from two elastic-plastic axisymmetric finite element computer programs which …
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The Structural Response of a Frame-Membrane Lunar Habitat Subjected to Impact and Thermal Loads
… loading such as impact, blast, or heavy wind loads. Because of their success on Earth, frame-membrane structures have also been proposed as possible lunar habitat. However, for any proposed lunar habitat, including frame-membrane structures, to be successful, it must be able to withstand the …
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Smart Prismatic Louver Technology for Enhanced Daylighting and Management of Thermal Loads in Green Buildings
… from mechanical systems by managing incoming thermal loads or capturing solar energy that can be used to supplement thermal systems in the building. While there are many available façade-based technologies that can perform daylighting or solar thermal energy harvesting, there remains a …
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Heat Transfer Assessment of Aluminum Alloy Corrugated Naval Ship Deck Panels under VTOL Aircraft Thermal Loads
… of aluminum alloy ship deck panels under the thermal loads of Vertical Take-off-and Landing (VTOL) capable aircraft has become a question of interest with the introduction of new primarily aluminum alloy ships to the U.S. Naval Fleet. This study seeks to provide an initial investigation of …
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Evaluation of Various Energy Storage Options for the Internal Thermal Loads of a Non-Airbreathing Hypersonic Vehicle
… Hypersonics not only produce large external thermal loads, but also an abundance of internal thermal loads from components such as power electronics, avionics, and batteries. Additionally, limited volume within such vehicles introduces additional constraints. Thus, having efficient heat sinks …
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Optomechanical Design of a Space Telescope Primary Mirror
… requirement of deformation due to space thermal loads, gravity loads in AIT environment and pressure loads during surface polishing. In addition to this, mass is also an important criterion. Telescope mass is also derived from the mass of the primary mirror. So, a lightweight primary …
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Characterization of stresses induced in doweled joints due to thermal and impact loads
… due to the application of mechanical and thermal loads has not been previously characterized. In this study a detailed Three-Dimensional Finite Element (3D FE) model was used to investigate the state of contact stresses, mid slab stresses, and load transfer efficiency that develop in dowel …
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Syngas production from heavy liquid fuel reforming in inert porous media
… Specifically, a range of equivalence ratios, thermal loads and porous materials have been examined. n-heptane was successfully reformed up to an equivalence ratio of 3, reaching a conversion efficiency (based on the lower heating value of H2 and CO over the fuel input) up to 75% for a packed …
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Thermomechanical Stability of Automotive Clutches and Brakes
… were performed to evaluate the stability thermal buckling existing in clutch disks. The commercial software ABAQUS had been used. It was discovered that monotonically increasing thermal loads constantly result in axisymmetric buckling modes. When the maximum values of thermal loads were …
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Probabilistic service life prediction of composite viscoelastic cylindrical structure under random outdoor environment
… both the statistical variations of environmental thermal loads and of material properties. The daily probability of failure was calculated considering failures due to both the excessive stress and strain. The probabilistic service life was then obtained via the evaluation of cumulative hazard …
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Elastomeric bearings in high demand applications : numerical study and experimental validation
… complex bridge movements from both environmental thermal loads and vehicular traffic. However, past bridge research, design, and installation experience demonstrates that less costly elastomeric bearings are not only easy to install, inspect, and replace, but also more forgiving of installation …
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Thermal Analysis and Response of Grid-Stiffened Composite Panels
A study aimed at determining the thermal deformation response and thermal buckling loads of rectangular grid-stiffened composite panels is presented. Two edge conditions are considered for the panel, one in which all panel edges are free to deform, and another when all the edges are restrained. In …
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Analysis of Cryogenic Cooling of Toroidal Field Magnets for Nuclear Fusion Reactors
… allow the magnets to operate under signifi cant thermal loads during the fusion process. As a case study, we look at the proposed SPARC toroidal field (TF) magnet design. We investigate the heat transfer inside the cooling channels and uid dynamics inside the cooling channels. System-level issues …
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Modeling the Transient Effects of High Energy Subsystems on High-Performance Aerospace Systems
… principles. This thesis examines the transient thermal loads that a high-energy weapon system introduces into a high performance aircraft using fundamental thermodynamic and heat transfer analyses. The high-energy weapon system employed in this research contains power storage, power conditioning …
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Thermal characterization and modeling of an energy storage system
… tool that was developed to predict and analyze thermal loads in an electric vehicle charging system. The tool was designed using computational fluid dynamics techniques and validated with experiments to provide a system-level view of the temperature profiles of all components and airflow …
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Additive Manufacturing for Phase Change Thermal Energy Storage and Management
… energy systems by time shifting or reducing peak thermal loads. Certain electronic devices such as batteries, laser systems, or electric vehicle power electronics are highly transient and require pulse heat dissipation. Heat sinks, or thermal management devices made of a phase change material can …
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Application of Machine Learning in Failure Prediction of Brazed-Aluminum Based Heat Exchangers
… and harsh environment that involves large thermal stresses due to steady-state and transient thermal loads, mechanical loads, contaminants, corrosion and exposure to low temperatures. Despite careful design for unlimited life, several pre-mature failures in different natural gas processing …
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New methods for measuring spectral bi-directional transmission and reflection using digital cameras
… be optimized to enhance daylighting and reduce thermal loads. Light redirecting window systems are one of many innovative fenestration systems available for improving the daylighting and thermal performance of buildings. Many emerging and existing light redirecting systems have both spectrally …
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