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 18 of 18 for “"Environmental loads"”.
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Standardized structural design for post-disaster modular housing units under clustered environmental loads
… a multi-design standardized solution. Known environmental loading taken from building codes is analyzed over the entire United States to create a data-set that describes the distinct loading conditions of each region. Loads are clustered into grouping that suggest a single housing typology …
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Mechanical Structure Design and Analysis of Focal Plane Unit (Fpu) for Earth Observation (Eo) Payload
… mechanics also needs to handle harsh launching loads to get the satellite in space. The important constraints of this design are the mass and volume which need to be considered during the design. Optical performance depends a lot on the design of the mechanics used to support and align optical …
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Nonlinear Control and Robust Observer Design for Marine Vehicles
… of the ship and bias from the slowly varying environmental loads. It also filters out wave frequency motion to avoid wear of actuators and excessive fuel consumption. Especially, the observer structure with a saturation function makes the proposed observer robust against neglected …
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Design, Analysis, Fabrication, and Testing of a Nanosatellite Structure
… and the model boundary conditions. We perform environmental testing on the integrated spacecraft at NASA Wallops Flight Facility to investigate the properties of the structural assembly. Finally, we create a model of the ION-F stack to verify the integrity of the structure at the launch loads. …
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Uranium extraction from seawater : investigating hydrodynamic behavior and performance of porous shells
… reserves resulting in higher prices and greater environmental footprints. An unlimited supply of uranium, roughly 4.3 billion tonnes, is dissolved in the ocean at a concentration of 3 parts per billion. Chemists have been developing polymers to extract uranium from seawater to provide fuel and …
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Early-age behavior of CRCP and its implications for long-term performance
… approach, structural responses of CRCP due to environmental and traffic loadings are computed. Damage to concrete is estimated over time, and pavement distress is predicted using empirically derived distress models. The reliability of the current CRCP design procedures depends, to a large …
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Dynamic behavior of operational wind turbines considering aerodynamic and seismic load interaction
… perform coupled simulations of wind and seismic loads, a seismic module has been developed for the publicly available National Renewable Energy Laboratory (NREL) code, FAST, at the first step of this research. This achievement allows engineers working in this industry to directly consider …
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Dynamic analysis of a spar-type offshore floating wind turbine and its mooring system
… its mooring systems, analysed under various environmental loads both by using state-of-the-art numerical software and conducting an experiment campaign at the Kelvin Hydrodynamics Laboratory. The free decay test has been carried out first to get the spar platform's motions natural frequencies …
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Determining the Influence of Experimental Setup and Inputs on Nonlinear Systems
… dynamic loading. The complex, multi-axial loads and surrounding system are the environmental conditions. Due to the lack of understanding of nonlinear system dynamics, the components and structures have been over-designed to handle these environmental conditions and reduce nonlinear …
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Towards monitoring volcanoes in Iceland and Hawai’i with seismic velocity variations
… controlling dv/v can be difficult and seasonal environmental stresses can obscure volcanic signals. I use volcanic tremor (∼ 0.3 to 1.0 Hz) at Kīlauea summit, Hawai’i, as a passive source for interferometry. Noise cross-correlation functions (CCFs), calculated between 230 station pairs, have …
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Drag coefficient and damping of moorings and their effect on FPSO's response
… in 400m water-depth is selected. Effects of environmental loads, including floater motions, current and waves, on the mooring line damping are investigated. Effect of random WF motions on mooring line damping, according to the study, can be represented by an equivalent harmonic WF motion if …
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Performance assessment of stabilised/solidified waste-forms
… a broad range of contaminants, binder systems, environmental exposures, and ages since the remediation. Conceptual models for each site were developed, based upon historical information from the literature. The models were used to identify the environmental loads, acting at the sites, and to …
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Freshwater fishes and microplastics in an era of multiple stressors
Microplastics, plastics < 5 mm in size, are environmental contaminants typically arising from the breakdown of larger plastics that may cause negative impacts when consumed by freshwater fishes. However, microplastic exposure occurs in combination with other interacting multiple stressors, for …
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Cyclic response of Gulf of Mexico clay from the Walker Ridge
… withstand a combination of non-standard cyclic environmental loads, gravity loads and seismic loads. The importance of these structures, be it from a safety, economic or environmental point of view, warrants an understanding of how their foundations and the foundation soils behave under cyclic …
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Structural fatigue assessment and optimisation of offshore wind turbine jacket foundations.
… into a super element model. The time-series loads obtained from Bladed are used to assess fatigue damages experienced during the foundation's service life. Furthermore, the research presents a topology optimisation method to retrofit an existing jacket foundation design by finding the optimum …
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Development and Applications of a Flat Triangular Element for Thin Laminated Shells
… deformations and rotations under the action of environmental loads like the wind and snow loads. The wind load is modeled as a nonuniform pressure load and the snow load as lumped concentrated loads. Since the direction of the pressure load is assumed to be normal to the current configuration of …
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Direct and adaptive quantification schemes for extreme event statistics in complex dynamical systems
… including mechanical components under environmental loads, ship rolling and capsizing, critical events in power grids, as well as chemical reactions and conformational changes in molecules. It has been recognized that extreme events occur more frequently than Gaussian statistics suggest …
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Service Life Assessment of Harbor Structures - Case studies of chloride ingress into concrete and sheet piling corrosion rates
… their remaining service life. Since the environmental loads on these structures differ substantially depending on their location, both globally and locally, the degradation processes of the structures also differ. Assessment of these types of structures must therefore combine general …