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Simulation and theoretical study of swimming and resistive forces within granular media
(Georgia Institute of Technology, 2011-11-14)
Understanding animal locomotion requires modeling the interaction of the organism with its environment. Locomotion within granular media like sand, soil, and debris that display both solid and fluid-like behavior in response ...
Nontrivial Impact
(Georgia Institute of Technology, 2015-08-18)
The purpose of this investigation is to identify and calculate the forces that occur on an impulsive object as it intrudes into granular media. The system analyzed is a computational model of a sinusoidally actuated ...
Kink-induced transport and segregation in oscillated granular layers
(Georgia Institute of Technology, 2003-09-26)
We use experiments and molecular dynamics simulations of vertically oscillated granular layers to study horizontal particle segregation induced by a kink (a boundary between domains oscillating out of phase). Counterrotating ...
Scaling and Dynamics of Sphere and Disk Impact into Granular Media
(Georgia Institute of Technology, 2008-02-29)
Direct measurements of the acceleration of spheres and disks impacting granular media reveal simple power law scalings along with complex dynamics which bear the signatures of both fluid and solid behavior. The penetration ...
The Effectiveness of Resistive Force Theory in Granular Locomotion
(Georgia Institute of Technology, 2014)
Resistive force theory (RFT) is often used to analyze the movement of microscopic
organisms swimming in fluids. In RFT, a body is partitioned into infinitesimal segments, each of which generates thrust and experiences ...
Mechanics of undulatory swimming in a frictional fluid
(Georgia Institute of Technology, 2012-12)
The sandfish lizard (Scincus scincus) swims within granular media (sand) using axial body undulations to propel itself without the use of limbs. In previous work we predicted average swimming speed by developing a numerical ...
Dynamics of drag and force distributions for projectile impact in a granular medium
(Georgia Institute of Technology, 2004-05-14)
Our experiments and molecular dynamics simulations on a projectile penetrating a two-dimensional granular medium reveal that the mean deceleration of the projectile is constant and proportional to the impact velocity. Thus, ...
A terradynamics of legged locomotion on granular media
(Georgia Institute of Technology, 2013-03-22)
The theories of aero- and hydrodynamics predict animal movement and device design in air and water through the computation of lift, drag, and thrust forces. Although models of terrestrial legged locomotion have focused on ...
The Effect of limb kinematics on the speed of a legged robot on granular media
(Georgia Institute of Technology, 2010-04-22)
Achieving effective locomotion on diverse terrestrial substrates can require subtle changes of limb kinematics. Biologically inspired legged robots (physical models of organisms) have shown impressive mobility on hard ...
Tail use improves soft substrate performance in models of early vertebrate land locomotors
(Georgia Institute of Technology, 2016-05-27)
In the evolutionary transition from an aquatic to a terrestrial environment, ancient vertebrates (e.g. early tetrapods) faced the challenges of terrestrial locomotion on flowable substrates (e.g. sand and mud) of variable ...