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 16 of 16 for “"resistive force theory"”.
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Development of Elastic Resistive Force Theory & Applications to Uprooting
… cost, especially for large systems. Granular Resistive Force Theory (RFT) is a reduced-order, rateindependent model that has been shown to successfully capture the motion of rigid intruders in granular media, with a reduced computational cost. RFT is based on a rate-independent theory that …
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Wheel design optimization for locomotion in granular beds using resistive force theory
The application of Resistive Force Theory to further understand the dynamics of wheeled locomotion through granular materials was explored. Resistive Force Theory is a new terradynamic model that simplifies the calculation of the forces applied to bodies moving through granular media because it …
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Wheel design optimization for locomotion in granular beds using resistive force theory
Inspired by hypotheses of Resistive Force Theory, a general dimensionless form for granular locomotion has been discovered, which instructs how to scale size, mass, and driving parameters to relate dynamic behaviors of different locomotors in the same granular media. These scalings are …
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Physical experimentation and actuated wheel design for granular locomotion using Resistive Force Theory
… the applications and predictive power of the Resistive Force Theory (RFT), an empirical model based on linear superposition designed to predict the interactive forces between solid bodies and granular media. Four-spoke wheel designs, made of four treads with a hinge halfway down each tread set …
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Development of a reduced-order modeling technique for granular locomotion
… reduced-order modeling technique called granular Resistive Force Theory(RFT) for modeling wheeled locomotion on granular beds. A combination of various modeling techniques, namely plasticity-based continuum modeling, discrete element method (DEM) modeling, along with RFT and collaborative …
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Bacteria in shear flow
… we developed a mathematical model employing resistive force theory. In general, the modeling of a bacterium requires consideration of two factors: the rotating flagellar bundle and the cell body to which the flagella are attached. To make the problem analytically tractable, we study the …
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Simulation and theoretical study of swimming and resistive forces within granular media
… the sand-swimming sandfish lizard. I developed a resistive force theory (RFT) with empirical force laws to explain the swimming speed observed in animal experiments. By varying the amplitude of the undulation in the RFT, I found that the range of amplitude used by the animal predicted the optimal …
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Optimizing Snake Locomotion on a Plane: A Variational and Analytical Framework for Friction and Normal Force Modulation
… steady, periodic deformations and utilizing resistive force theory (RFT), we derive variational optimization conditions for minimizing the mechanical cost of transport (mCoT) and maximizing forward displacement. The results show that sawtooth-shaped body waveforms—characterized by alternating …
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Reduced-order modeling of granular intrusions driven by continuum approaches
… deep insights into the origin of granular resistive forces encountered during granular intrusions. We further use these insights to extend an empirical modeling method called Resistive Force Theory (RFTs) for real-time modeling of granular intrusions. RFTs developed in this work are …
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Influence of pH and protein ChePep on motility of Helicobacter pylori
… were analyzed and torque was calculated using resistive force theory (RFT). The results indicated that decreasing pH leads to decreased fraction of motile trajectories and mainly impacts the high end of distributions of swimming speeds and length of trajectories. At all pH’s the bacteria swim …
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Propulsion By Sinusoidal Locomotion: A Motion Inspired By Caenorhabditis Elegans
… and the application of the state-space airloads theory to the theoretical forces of sinusoidal motion. An original MATLAB program has been developed to analyze the video records of C. elegans' movement in different fluids, including Newtonian and non-Newtonian fluids. The experimental and …
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Tricks and tips for faster small-scale swimming: Complex fluids and elasticity
… empirical extensions of the classical Newtonian resistive-force theory to model the waving of slender filaments in non-Newtonian fluids, based on experimental measurements for the motion of rigid rods in non-Newtonian fluids and on the Carreau fluid model. We then use our models to address waving …
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Geometry and Hydrodynamics of Swimming with a Bundle of Bacterial Flagella
… the hydrodynamics of slender filaments, namely resistive-force theory (RFT) for the analytical calculations and slender-body theory (SBT) for the numerical simulations. The first part of the thesis, comprising three chapters, deals with the geometric aspects of having multiple helical filaments …
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Bacterial motility and growth in open and confined environments
… on cell body and flagellum near a boundary (resistive force theory) or model the swimming microorganism by a multipole expansion to account for the flow field interaction between cell and boundary. An accumulation of swimming bacteria near solid boundaries has been observed in similar …
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Active cellular flows: biological networks, cytoplasmic streaming and swimming bacteria
… near-optimal nuclear spreading. Lubrication theory produces an even simpler solution, applicable to more general cell geometries and incurring errors below 5% compared with the exact solution. An application of this lubrication result to transport leads to fully analytical solutions for the …
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Active filaments and hydrodynamic interactions in microscale propulsion
… Our results point to the robustness of force modulation for synchronization, an important feature for biological dynamics that therefore suggests it could be the most essential physical mechanism overall in arrays of cilia. In the last chapter on active filaments, we report on active …