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 872 for “"Analytical Model"”.
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Analytical model for staging emergency evacuations
… or staged). In this dissertation, mathematical models are developed for estimating evacuation time and delay. Evacuation time is the time for evacuating all vehicles from a designated region, while delay includes queuing and moving delays incurred by evacuees. The base model handles a uniform …
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A comprehensive analytical model for pneumatic tires
This study presents a comprehensive analytical tire model for both vehicle dynamic simulation and tire design. The model is composed of two parts--modeling of the contact mechanism and determination of the tire forces/moments. A static circular beam model is introduced for the contact mechanism, in …
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Analytical model for reinforced concrete under cyclic loading
… limited by the inadequate understanding and modelling of material behavior. In many cases the degree of sophistication of the global structural analysis techniques is far superior to that of the material models being used. This situation is especially true with reinforced concrete structures. …
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Semi-analytical model of ionization oscillations in Hall thrusters
… The first part of this thesis details a steady model of the ionization region in a Hall thruster that finds existence criteria for the steady solution under the hypothesis that the steady limits match the smooth sonic passage limits. Operation outside these limits would correspond to unsteady …
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Analytical model for force prediction when machining metal matrix composites
… both money and time. This research presents an analytical force model for predicting the forces generated during machining of Metal Matrix Composites. In estimating the generated forces, several aspects of cutting mechanics were considered including: shearing force, ploughing force, and particle …
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An Analytical Model for Fusion First-Wall Temperature Calculations (Conduction)
A primary analytical thermal analysis model is presented which allows for calculation of temperatures in fusion reactor first walls. The model utilizes input quantities based on plasma physics calculations and couples a two-and-one-half-dimensional geometric analysis with a one-dimensional heat …
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A hybrid computational and analytical model of irrigation drip emitters
This thesis details a hybrid computational and analytical model to predict the performance of inline pressure-compensating (PC) drip emitters. A verified CFD model is used to predict flow behavior through tortuous paths. A method of extracting a pressure scaling parameter from the CFD results for …
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Analytical model for a cylinder sinking into a thin film
… cables sink. In this analysis, the mud cake is modeled as a Newtonian fluid. The surface of the cable is approximated as being either parabolic or circular, and it is shown that the sinking is governed by exactly two dimensionless parameters in both cases. Matlab is used to visualize the …
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A Semi-analytical Model for Nonlinear Elliptical Inclusions with Spherical Eigenstrains
… in 1957, John D. Eshelby provided a fully-analytical solution for the stress and deformation fields induced by an incompatible ellipsoidal inclusion embedded within an infinite matrix. Over the past six decades, his theory, which considers linearly elastic materials, has been essential in …
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An experimental and analytical model of a PWR pressurizer during transients
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1984.
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An analytical model of strength loss in filament wound spherical vessels
… developed using an incremental finite element model of the composite during fabrication. The sphere was modeled taking into account the winding/loading pattern and the resulting internal layer boundaries. The thickness profile of the sphere's layers were computed using a thickness …
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Determining thermal properties via parameter estimation of a one-dimensional, analytical model
“In thermal applications, thermal conductivity is used to predict how well a material conducts heat. The accuracy of the magnitude of the thermal conductivity becomes increasingly essential to optimize part geometry. Thermal conductivity can vary significantly from the nominal value due to …
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Downhole Weight on Bit Prediction with Analytical Model and Finite Element Method
… drillstring is not considered. Drillstring force modeling computer simulation can be utilized to economically determine the actual WOB value. In this thesis, two drillstring force models are programmed and compared: an analytical model and a finite element method (FEM). In conclusion the …
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Parameter Importance of an Analytical Model for Transport in the Vadose Zone
… site specific information and screening level models to assess the potential risk must be conducted. Screening level models generally require site specific input parameters. To increase efficiency it would be helpful to know which parameters have large affects on model output and which …
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An Analytical Model Which Combines Roughness- and Plasticity- Induced Fatigue Crack Closure
… size effect was investigated using the PICC-RICC model. The initial crack length (a$\rm\sb{i})$ for propagation was estimated. The predicted notch fatigue strength compared favorably with the Initiation-Propagation (I-P) Model prediction and test data. The existence of a ""worst case notch"" …
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An analytical model for the seismic analysis of reinforced concrete frame structures
The thesis is concerned with developing an analytical model to describe the cyclic behaviour of reinforced concrete members. The mechanisms which are important in the behaviour of members dominated by flexural deformations are identified. They include bar-slippage due to deterioration of the bond …
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Analytical model development and experimental investigation of process model size effects in microforming
… technologies, a critical need to develop process models that can accurately predict the required parameters, such as process forces, has arisen. As with the manufacturing processes themselves, macroscale process models can not effectively be used at the microscale due to size effects, i.e. changes …
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Analytical model and simulations of closed-loop rebreather systems for Earth and Space applications
… This thesis presents the development of an analytical rebreather model, which is the system that recirculates and conditions the air the diver is breathing during a dive. The capability of simulating rebreather performance is currently lacking in the diving commercial and military industry. …
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