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 21 for “"Coupled Analysis"”.
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A hydrodynamic analysis of deep-water moorings
… configuration and design method. Methods of analysis need to be re-evaluated as water depth increases. The primary purpose of this thesis is to study the hydrodynamics of deep water moorings and the nonlinear dynamic response of the mooring line, which is representative of a Spar platform and …
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Flexible dynamics of floating wind turbines
… Tower Flex, a structural dynamics model for a coupled analysis of offshore floating wind turbines consisting of a tower, a floating platform and a mooring system. In this multi-body, linear frequency-domain model, the tower is represented as a series of uniform Timoshenko beams connected to …
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Multidisciplinary design optimization of an eVTOL aircraft using analytical target cascading
… across independently designed subcomponents via coupled analysis and design. In this work, a hierarchical decomposition approach is introduced for the integration of preliminary sizing as well as various component level design and optimization models of a fully electric vertical takeoff and …
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Drag coefficient and damping of moorings and their effect on FPSO's response
… due to its lowdamped characteristic and hence coupled analysis is normally preferred to accurately predict the floater motions as well as the mooring and riser system response. The aims of this thesis are to investigate mooring line damping, drag coefficient of mooring chain and their effect on …
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Coupled Adjoint-based Sensitivity Analysis using a FSI Method in Time Spectral Form
A time spectral and coupled adjoint based sensitivity analysis of rotor blade is carried out in this study. The time spectral method is an efficient technique to solve unsteady periodic problems by transforming unsteady equation of motion to a steady state one. Due to the availability of the …
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Helium Atom Scattering from Chiral Structures
… considerations to im- prove data acquisition and analysis; the second is the development of a theoretical basis to help quantify the interaction of He with a chiral surface as well as assess its sensitivity as a probe of surface chirality. Chapter 2 introduces a 3D scattering simulation that …
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Dynamics of multi-body space interferometers including reaction wheel gyroscopic stiffening effects : structurally connected and electromagnetic formation of flying architectures
… connected interferometers, we develop a coupled disturbance analysis method that accurately predicts a space telescope's optical performance in the presence of reaction wheel vibrational disturbances. This method "couples" a reaction wheel to a structure using estimates of the …
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Numerical Analysis of RAP Elements under Dynamic Loading
… model is developed in a FLAC platform and a coupled analysis using the Finn model with Byrne (1991) formulation is conducted. The FD model calibrated for top-down shakings similar to the vibroseis tests succeeded in qualitatively reproducing the general observed behavior without …
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Visualizing and Interacting with Externally Coupled Engineering Analysis Results
<p>Visualizing and interacting with engineering analysis results can provide valuable insights into a system's performance and aid in engineering decision-making. Currently, the majority of analysis codes are developed as isolated solutions focusing only on the most prominent physical influence to …
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LEU+ Fuel Cycle Investigation of the BWRX-300 Design Using Neutronic and Two-Phase Thermal Hydraulic Analyses
… conditions respectively. When performing coupled calculations between these two codes, large computational cost is seen, especially in neutronic burnup calculations in three dimensions. The main challenge when performing coupled neutronic burnup calculations in BWRs is the accurate capture …
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Model Reduction of Computational Aerothermodynamics for Multi-Discipline Analysis in High Speed Flows
… flux and pressure loads for multi-disciplinary analysis of hypersonic vehicles.NASA and the Department of Defense have expressed renewed interest in the development of responsive, reusable hypersonic cruise vehicles capable of sustained high-speed flight and access to space. However, an …
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Optimization of Pile Reinforced Slopes Using Finite Element Analyses
… slopes. Many practical empirical design and analysis methods of slope stability and piled-slope stability have been proposed. However, the solutions of analysis and design methods proposed vary due to different analysis methods used and the design methods are poorly understood because the …
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Development of a Sediment Sampling Free Fall Penetrometer Add-on Unit for Geotechnical Characterization of Seabed Surface Layers
… layer characteristics and behavior based on a coupled analysis of geotechnical data from in-situ PFFP tests and the sedimentological data collected using box cores and the novel sediment sampler. In summary, novel strategies and instrumentation to carry out simultaneous sediment sampling and …
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A Computational Framework for Long-Term Atomistic Analysis of Solute Diffusion in Nanomaterials
… three-dimensional, deformation-diffusion coupled analysis of solute mass transport in nanomaterials. First, a computational framework is presented, which consists mainly of: (1) a computational model for interstitial solute diffusion, which couples a nonlinear optimization problem with a …
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Computational Study of Highway Bridges Structural Response Exposed to a Large Fire Exposure
… was predicted through a series of three loosely coupled analyses: fire analysis, thermal analysis, and structural analysis. Two different types of fire modeling methodologies were developed in this research and used to predict the thermo-structural response of bridge structural elements: one to …
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Finite element study of geosynthetic encased stone columns in sensitive soft clay
… conditions. The model was further implemented in coupled analysis formulation and coded into FEM program AFENA. Various cases with different soil parameters were then simulated and compared with the FD solutions for various triaxial tests so as to check the stability of the FEM code. The coupled …
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Coupling of Structural Dynamic and Acoustic Analyses Using the FEM and BEM
… (FEM) is chosen for the structural dynamic analysis in order to calculate the natural frequencies and harmonic responses of the structure. The boundary element method (BEM) is used in the acoustic analysis of the structure to calculate the radiated sound field. In the BEM, only the surface …
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Application of the Finite Element Method to Solve Coupled Multiphysics Problems for Subsurface Energy Extraction
Fractures are a source of extra compliance in the rock mass. Fracture compliance can estimate the fracture roughness and the type of fluid filling the fracture. The focus of this research study in chapter 2 is to illustrate how the compliance ratio of rough fractures can diverge from the compliance …
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Grade effects on thermal-mechanical behavior during the initial solidification of steel
… these two models are combined for a preliminary coupled analysis of a depression. The effect of different steel grade on the relevant behavior is captured according to the phase fractions and the properties of each phase. The model is validated using analytical solutions, and applied to explore …
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A CFD study of fluid-structure interaction problems for floating offshore wind turbines
… fixed-bottom wind turbines, an FOWT is a fully coupled system where the wind turbine with flexible blades and the floating platform with its mooring system interact with each other in wind and waves, which makes old design tools inadequate.;This work aims to develop a fully coupled high-fidelity …
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