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 25 for “"Resistive force"”.
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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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Determining optimal load for a constant-load cycle ergometer test relative to isotonic leg strength
… investigated the determination of an optimal resistive force for use during a short-term, high-intensity cycling power test. Twenty-four college females [age (yrs) x̄=22.0 ± 0.50; weight (kg) x̄=60.3 ± 1.46] gave consent and participated in a 1 repetition maximum (RM) test of the leg extensors …
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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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Um modelo constitutivo para o escoamento através de um arranjo de barras de seção circular
… flow are made. Constitutive equations for the resistive force are determined from Jakob's and Rowe's correlations, and its behaviour analysed for a standard case. Comparison of these equations with Bottgenbach's experiments shows good agreement of the direction of the pressure, although direct …
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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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Robust proprioceptive grasping with a soft robot hand
… finger unit modules. The finger module includes resistive force sensors on the fingertips for contact detection and resistive bend sensors for measuring the curvature profile of the finger. The curvature sensors can be used to estimate the contact geometry and thus to distinguish between a set of …
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Squat exercise biomechanics during short-radius centrifugation
… speeds up to 30 revolutions per minute. Constant force springs provided additional resistive force up to 25% of body weight. Dependent measure included the three-dimensional position of the left and right knee, left and right foot reaction forces, and muscle activity. We investigated 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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Elbow exoskeleton mechanism for multistage poststroke rehabilitation.
… to offer all three types of exercises (external force, assistive and resistive) in a single structure. The design enhances torque to weight ratio compared to joint based actuation systems. The structural lengths of the exoskeleton are determined based on the mean anthropometric parameters of …
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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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Optimisation considerations for the measurement of human muscle power
… measure power outputs. Most of the tests utilise resistive forces that are based on total-body mass values (TBM). Conceptually, selecting an optimal resistive force based on total-body mass may not be the best approach. Resistive forces that reflect the mass of the lean tissue specifically …
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Propulsion By Sinusoidal Locomotion: A Motion Inspired By Caenorhabditis Elegans
… 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 numerical studies of swimming C. …
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Scoliosis Analog Model for the Evaluation of Bracing Technology
… of the spinal curve by applying corrective forces. The magnitude and direction of these corrective forces applied by the brace to the spine remain unknown. Additionally the brace fitting process involves making alterations to the brace that affect its corrective force capacity. The objective …
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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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