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 11 of 11 for “"System Strength"”.
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Standing seam roof system strength under uplift loading
… supported, standing seam metal building roof systems. To achieve this end, eight sets of full-scale roof system tests were conducted. Each test set consisted of a single span base test and a three-span, multi-purlin line, confirming test. The base test method for uplift loading, in its present …
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A historiography of South Africa's public health care governance affecting health system strength from the 1940s to 2023
… minority rule socially engineered a system built on the brutality of black and brown people in South Africa leading to the aggravation of opportunistic infections. Centuries of white capitalist governance enslaved Black populations through settler colonialism and continued to inflict …
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Strength of z-purlin supported standing seam roof systems under gravity loading
The objective of the Standing Seam Roof Systems Research Project at the Virginia Polytechnic Institute and State University is to develop a design procedure for the strength of Z-purlin supported standing seam roof systems under gravity leading. Various approaches were taken to calculate the …
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Transmission grid strength analysis and operation of inverter-based microgrids
… inertia and short-circuit capacity to the power system. As a result, frequency response and voltage regulation may be adversely affected. For this reason, this work focuses on evaluating transmission system strength and operation of microgrids with inverter-interfaced resources. The strength of …
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Improved HVdc dynamic performace via phase locking to virtual Thévenin voltage
… introduced and evaluated for application in HVdc systems. As compared with the conventional Trans-vector PLL method, it is shown that the enhanced tracking ability of the IC-PLL improves the dynamic performance of the HVdc system. The thesis shows that these benefits accrue in LCC-HVdc systems as …
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Synchronous Condensers and Grid-Forming Control for the Integration of Inverter-Based Resources in Weak Grids
Power systems with a higher share of inverter-based resources (IBR) exhibit reduced system strength and inertia, which are otherwise provided by synchronous generators (SG). This is because IBRs do not have the rotational inertia of SGs, and they do not contribute to short-circuit fault currents as …
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A structural design process for a next generation aerospace design environment
… tightly coupled, somewhat ‘monolithic’, sizing system. Strength, stability and stiffness design criteria were considered. Automation of the process was also considered and compared against the existing sizing process. It was found that the current labour intensive sizing process could be …
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Alloy design or three-dimensional printing of hardenable tool materials
… 3DP tools made to date are composed of a high-strength skeleton material and a low-strength infiltrant. The search for a hardenable/hard 3DP system is the mission of this dissertation. Five major accomplishments can be found in the dissertation: (1) development of the 420/bronze material system …
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Computational Investigation of Tunable Steel Plate Shear Walls for Improved Seismic Resistance
… (SPSWs) are popular lateral force resisting systems whose practical applications range from high seismic regions to medium and low seismic areas and wind load applications. The factors which make SPSW attractive include its energy dissipation capacity, excellent ductility, constructability, …
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Seismic stability of buckling-restrained braced frames
… are widely used as a seismic force-resisting system due to their advantageous properties for ductility and energy dissipation. However, because of the modest overstrength and relatively low post-yielding stiffness, BRBFs subjected to seismic loading may be susceptible to concentrations of …
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Significance of battery energy storage systems in mitigating the challenges in weak grids
Power systems have undergone major transformations in recent years, with the main sources of generation shifting from fossil fuel generators to renewable energy sources (RES). This trend is expected to continue, as almost all government bodies have faced enormous public pressure to address climate …