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 54 for “"physics-based model"”.
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Pushing with a physics-based model
… motion are difficult to measure. We derived a physics-based box pushing model and implemented a feedback-based pushing pipeline using the model. Experimental results show that our pushing model has fair predictive power and our pushing pipeline can reliably push the target to the goal. We …
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Tire-Road Friction Coefficient Estimation Using a Multi-scale, Physics-based Model
… surfaces by manipulating texture. General, physics-based methods for predicting friction are incredibly difficult, if not impossible to realize—However, for the specific case of rubber sliding across a rough surface, the primary physical mechanisms responsible for friction, notably rubber …
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Physics-based model and data analysis for the estimation of transverse flowing particles
… through the interrogation laser. However, no model yet has used a complete physical simulation to provide a predictive model that can be used to determine key pulse shape effects that would be valuable to determine the shape and size of particles passing through the laser beam. Such a model …
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Development and assessment of a physics-based model for subcooled flow boiling with application to CFD
… and, more recently, in electronics cooling. Physics-based models that describe boiling heat transfer, when coupled with Computational Fluid Dynamics (CFD), can be an invaluable tool to increase the performance of such systems. Existing modeling approaches do not incorporate all relevant heat …
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Self-calibrating mass flow sensor
… In analyzing the mass flow sensing system, a physics-based model was developed to describe the relationship between the rate of mass flow through the combine and the measured force imparted to the impact plate in terms of mechanical properties of the grains and the interior geometry of the …
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Constitutive Modeling of Friction in Bolted Connections
… in mechanical engineering, requiring accurate models to optimize designs. However, the exact nature of frictional contact between components is unknown and poses a significant challenge to modeling the nonlinear vibration of assemblies. This thesis applies empirical and physics-based modeling …
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COMMON MODE VOLTAGE ELIMINATION IN THREE-PHASE FOUR-LEG INVERTERS UTILIZING PULSE DENSITY MODULATION
… density modulation (PDM) in conjunction with model predictive control (MPC) and delta modulation. A physics-based model of the equipment under test (EUT), utilizing state-space modeling, was analyzed using computer simulations and a laboratory prototype, utilizing SiC switching devices, was …
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Physics-Based Li-Svo Cathode Model
<p>A cathode half cell physics-based model for a St. Jude Medical fabricated silver vanadium oxide (SVO) cathode coin cell battery was constructed. The model is based on a single particle Fick's second law approach with the open-circuit potential modeled with a Redlich-Kister equation. By assuming …
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Investigation of the hazards of substrate current injection: transient external latchup and substrate noise coupling
… depends on the duration of the trigger event. A physics-based model is provided to model the effects of aggressor to victim spacing and orientation on transient triggering of external latchup. The latchup susceptibility of standard cell based designs is also investigated. Guard rings are used to …
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Data assimilation into physics-based thermoacoustic models using Bayesian neural network ensembles
… tests, leading to costly re-designs. A physics-informed, data-driven model of a flame would allow for important quantities, such as the fluctuating heat release rate of the combustion process, to be estimated for a given burner geometry. This in turn would enable different geometries to …
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A digital approach to the management of brownfields
… oil wells. Building on the output of validated physics-based models, this thesis investigates a range of analytic methods which may be used to determine a probable depth of gas lift injection of wells without pressure gauges, and finds that the Random Forest method coupled with a k-means …
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Multi-Scale Physics Based Modeling of Tire Rolling Resistance Considering Aging
… dissertation aims to develop a comprehensive physics-based model for predicting the rolling resistance of a viscoelastic material due to dynamic deformations caused by tire rotation using an analytical approach. The model was developed by proposing a Gaussian wave function propagating across a …
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Direct Adaptive Control for Stability and Command Augmentation System of an Air-Breathing Hypersonic Vehicle
… Control scheme for stabilizing a non-linear, physics based model of the longitudinal dynamics for an air breathing hypersonic vehicle. The model, derived from first principles, captures the complex interactions between the propulsion system, aerodynamics, and structural dynamics. The …
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Deterministic and stochastic modeling of the water entry and descent of three-dimensional cylindrical bodies
An effective physics-based model has been developed that is capable of reliably predicting the motion of a three-dimensional mine-shaped object impacting the water surface from air and subsequently dropping through the water toward the sea bottom. This deterministic model, MINE6D, accounts for …
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Formulating design rules to predict 2D materials and heterostructures for next-generation electronics
… first-principles quantum theory methods, physics-based model Hamiltonian analysis, and high-performance computing, the structure-property relationships of two-dimensional materials, their heterostructures, and their interaction with substrates, have been explored to identify simple design …
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A physics-based emissions model for aircraft gas turbine combustors
In this thesis, a physics-based model of an aircraft gas turbine combustor is developed for predicting NO. and CO emissions. The objective of the model is to predict the emissions of current and potential future gas turbine engines within quantified uncertainty bounds for the purpose of assessing …
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The Polarimetric Impulse Response and Convolutional Model for the Remote Sensing of Layered Vegetation
… exists no complete, computationally efficient, physics-based model to compute the radar backscatter from forest canopies. Several models attempt to predict the backscatter coefficient for random forest canopies by using the Vector Radiative Transfer (VRT) Theory with success, however, these …
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A service-driven approach to assist water management during extreme events
… data synthesis, near-real-time forecasting, and model-based decision support for water operations. A structure to rapidly process heterogeneous information and models needed for near-real-time water management is critical for decision makers. This dissertation develops a service-driven approach …
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Adaptive control of hydraulic shift actuation in an automatic transmission
A low-order dynamic model of a clutch for hydraulic control in an automatic transmission is developed by separating dynamics of the shift into four regions based on clutch piston position. The first three regions of the shift are captured by a physics-based model and the fourth region is …
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Nonlinear dynamic model and simulation of a high pressure monotube shock absorber using the bond graph method
A physics-based model for a high pressure monotube shock absorber is proposed by which the nonlinear dynamic behavior of these dampers can be analyzed. The bond graph technique is used to model these shock absorbers accurately over a wide range of stroking frequencies and to identify the …
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