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 22 for “"Ring Model"”.
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Prediction of the off-road rigid-ring model parameters for truck tire and soft soil interactions
… and development. Fully detailed virtual truck models using the simplified off-road rigid-ring model parameters may further increase these economical savings within the automotive industry. The determination of the off-road rigid-ring parameters is meant to facilitate the simulation of full …
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MIMO channel model
… the capacity capability of the geometric channel model by using the one-ring and two-ring channel model and attempting to explain the differences and similarities between these two models.Simulations were performed on one-ring and two-ring channel models by using mat-lab code programming. These …
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Modeling of liner finish effects on oil control ring lubrication in internal combustion engines based on deterministic method
Twin-land oil control ring is widely used in the automotive diesel engines, and is gaining more and more applications in the modern designs of gasoline engines. Its interaction with the cylinder liner surface accounts for around 10% of the total frictional losses within an internal combustion …
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Design of miniature floating platform for marginal fields
… analysis and hull optimization. A self-developed model "Discrete Vortex Ring Model" (DVRM) to efficiently estimate the viscous drag due to the vortex shedding of the oscillatory heave plate is presented in details. This new model DVRM combined with the standard radiation/diffraction code WAMIT is …
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Modelling and validation of agricultural tire-terrain interaction
… has been extensively used for many engineering applications. More precisely, computerized methods have paved way for accurately simulating tire-terrain interaction. By predicting forces, vibrations, and numerous physical effects, any industry with pneumatic tires can greatly reduce time, …
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A Spatial Analysis of 24HL1085: A Prehistoric Site in the Bear's Paw Mountains
… In order to complete this analysis the three ring model developed by Stevenson (1985) was adapted and combined with the trend surface analysis created by Hodder and Orton (1976). Theory behind this analysis was based heavily on work done by Binford (1978, 1979, 1980, 1983, 1987). Results from …
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A Spatial Analysis of 24HL1085: A Prehistoric Site in the Bear's Paw Mountains
… In order to complete this analysis the three ring model developed by Stevenson (1985) was adapted and combined with the trend surface analysis created by Hodder and Orton (1976). Theory behind this analysis was based heavily on work done by Binford (1978, 1979, 1980, 1983, 1987). Results from …
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Self-similarity of Random Aggregation Trees in Hyperbolic Spaces
… power-law degree distribution and strong clustering, emerge naturally once a network is embedded into a hyperbolic space of a negative curvature. This thesis develops this general idea in application to the self-similar structure of rooted trees. We use a self-similarity framework based on the …
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Modeling internal combustion engine three-piece oil control ring coupling reduced order oil transport based on neural network
… contributes to particle formation and piston ring friction occupies 1/3 to 1/2 of total mechanical losses in engines. In almost all of modern gasoline engines, three-piece oil control ring (TPOCR) is used considering its low-cost and satisfying oil control performance in low load work …
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Deep HI observations of nearby late-type galaxies
… of the interacting galaxies. Using a tilted-ring model, we also construct a large-scale rotation curve of the system formed by the interacting galaxies. Consistently with the large-scale velocity field, we observe a flat trend for the rotation velocity of the system from 20 kpc out to 80 kpc, …
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Deep HI observations of nearby late-type galaxies
… of the interacting galaxies. Using a tilted-ring model, we also construct a large-scale rotation curve of the system formed by the interacting galaxies. Consistently with the large-scale velocity field, we observe a flat trend for the rotation velocity of the system from 20 kpc out to 80 kpc, …
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Identification of Tire Dynamics Based on Intelligent Tire
… fusion technology of intelligent tire and tire modeling. To achieve goals, extensive literature reviews on the estimation methods using the intelligent tire system was conducted at first. Strain-based intelligent tires were introduced and tested in the laboratory for this research. Based on the …
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Development and Validation of a Tool for In-Plane Antilock Braking System (ABS) Simulations
… capabilities a step forward by integrating models that are best developed in different software interfaces. An in-plane rigid ring model is used to understand the transient response of tires to various high frequency events such as Anti-Lock Braking and short wavelength road disturbances. A …
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A zero kernel operating system : rethinking microkernel design by leveraging tagged architectures and memory-safe languages
… fit within the scope of a language memory-safety model. To reduce the scope of these errors, microkernels isolate and reduce privilege by moving much of the traditional kernel into userspace services. However, their effectiveness is limited by the inflexibility of modern hardware. The Zero Kernel …
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Development and optimization of a wide base FEA truck tire model for prediction of tire-road interactions
… has been a dynamic movement towards virtual modeling and experimentation of pneumatic tires. This thesis provides a detailed analysis of the selection, construction, validation, and possible applications for a Finite Element Analysis (FEA) based tire model. Through the use of an Adaptive …
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Mathematical Analysis of Compressive/Tensile Molecular and Nuclear Structures
… bond lengths; an ideal pyramidal solid which models covalent bonds was also generated. Second, the macroscopic compression/tension architectural approach was applied to forces at the molecular level, considering atomic interactions as compressive (repulsive) and tensile (attractive) forces. …
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Developing an approach utilizing local deterministic analysis to predict the cycle friction of the piston ring-pack in internal combustion engines
… goes to the friction loss between piston ring pack and liner finish. A twin-land oil control ring (TLOCR) deterministic model was developed by Chen et al. and it helps the automotive companies investigate the effects of liner finish, rings, and lubricants on friction and oil control of the …
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Modeling the lubrication of the piston ring pack in internal combustion engines using the deterministic method
Piston ring packs are used in internal combustion engines to seal both the high pressure gas in the combustion chamber and the lubricant oil in the crank case. The interaction between the piston ring pack and the cylinder bore contributes substantially to the total friction power loss for IC …
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Complex Equilibrium of Laterally Curved Wakes
… The analyses provide useful information in modeling curved or spiral wakes such as turbulence field surrounding tip vortices shed from a wing. In order to achieve our objectives, the Virginia Tech 3’ x 2’ subsonic wind tunnel was used to take velocity measurements of toroidal ring model and …
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A multi-scale model for piston ring dynamics, lubrication and oil transport in internal combustion engines
… engine friction reduction. Piston and piston rings contribute approximately half of the total engine friction and are therefore central to friction reduction efforts. The most common method to reduce mechanical losses from piston rings has been to lower ring tension, the normal force providing …
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