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.
Results
Showing 1 to 20 of 157 for “"Angular Velocity"”.
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Trackable Features Provide a Cue to the Angular Velocity of Rotating Objects
… on the object moves with an instantaneous linear velocity dependent upon its distance from the center of rotation, while the object as a whole rotates with a fixed angular velocity. Does the perceived rotational speed of an object correspond to its angular velocity, linear velocities, or some …
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Estimation of spacecraft attitude in the presence of unmodeled disturbance torques
… attitude from rate gyroscope measurements of angular velocity and indirect inertial orientation measurements obtained from a pair of star sensors. The estimation algorithm is developed in such a way that the measured minus estimated angular velocity residuals are consistent with the apriori …
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Visual Contributions to the Vestibulo-Ocular Reflex during Balance Recovery Tasks
… is quantified by computing the ratio of head angular velocity and eye angular velocity (VOR Gain). This measure only includes head angular movements; linear translations are not accounted for. These investigations postulate an alternative method of VOR quantification, one that assesses retinal …
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An experimental and simulation based approach toward understanding the effects of obesity on balance recovery from a postural perturbation
… types of postural perturbations: an initial angular displacement, an initial angular velocity from the natural stance, and an initial angular velocity from a prescribed position. Obese participants were unable to recover balance using an ankle strategy as well as normal-weight participants …
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Surface reconstruction from interferometric ISAR data
… algorithm was devised to determine the angular velocity of a target using only one interferometric baseline. Knowing the angular velocity of the target is necessary to correctly scale the axes of ISAR images and IFSAR point clouds. Though techniques exist for angular velocity …
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Discrete-time Stable Geometric Controller and Observer Designs for Unmanned Vehicles
… scheme estimates the attitude and constant angular velocity bias vector from a minimum of two known linearly independent vectors for attitude, and biased angular velocity measurements made in the body-fixed frame. The constant bias in angular velocity measurements is also estimated. The …
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A multisensory observer model for human spatial orientation perception
… assume that the CNS estimates "down", head angular velocity and linear acceleration utilizing an internal model for gravity and sense organ dynamics, continuously updated by sensory-conflict signals. CNS function is thus analogous to a Luenberger state observer in engineering systems. Using …
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Damage Reduction Strategies for a Falling Humanoid Robot
… of critical damage. This thesis proposes joint angular velocity strategies to reduce the impact velocity resulting from a lateral, backward, or forward fall. These strategies were used on two and three link reduced order models to simulate a fall from standing height of a humanoid robot. The …
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Electrohydrodynamic interactions of colloidal particles undergoing Quincke rotation
… rotation reaches a steady state with a constant angular velocity obtained by balancing the viscous torque with the electric torque due to the induced dipole. The dynamics of a particle undergoing Quincke rotation have been previously shown to obey the classic Lorenz oscillator equations with two …
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A biomechanical analysis of soccer heading technique
… to head as hard as they could. Incoming ball velocity was consistent at 8.2 m/s (+/− .2 m/s). Variables measured included: difference in velocity from pre-contact to post-contact, trunk ROM from initiation of flexion to contact, trunk and neck angular velocity at contact, and average linear …
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Spacecraft Attitude Tracking Control
… spacecraft. The open-loop reference attitude, angular velocity, and angular acceleration tracking commands are constructed so that the solar panel vector is perpendicular to the sun vector during the tracking maneuver. We develop a nonlinear feedback tracking control law, derived from Lyapunov …
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Kinematics of drop punt kicking in Australian rules football - comparison of skilled and less skilled kicking
… PDS motions are also typified by a higher angular velocity of the distal segment (shank). Studies that have compared the difference between skilled and less skilled kickers in Australian Rules football have found that the difference in performance is the result of 1) the position of the …
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Isokinetic Knee Strength in Females with Fibromyalgia
… muscle groups (flexors and extensors) at two angular velocities (607sec and 1807sec) were tested for both groups. Both muscle groups were assessed continuously using five reciprocal concentric-concentric cycles, followed by five eccentric-eccentric cycles.</p> …
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Design of an Experimental Rig to Characterize the Gust Response of Small Wind Turbines and Autorotating Seeds
… exposed to a sudden increase in oncoming flow velocity, i.e. a gust. These rotors consisted of blades with aspect ratios characteristic of samara seeds, which are known for their ability to maintain autorotation in unsteady wind. The models were tested in a towing tank using a custom-built …
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POWER SPECTRAL ANALYSIS OF SURFACE MYOELECTRIC SIGNALS DURING DYNAMIC CONTRACTIONS
… In this work, non-fatiguing, isotonic, constant velocity contractions of the right biceps brachii m. were studied. The median frequency and the spectral power were chosen as test indicators of any changes that may occur due either to the loading of the muscle, the angular velocity of contraction …
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The dependence of suspension viscosity on particle size, shear rate, and solvent viscosity
… of factors, including but not limited to the angular velocity, the size of particles, the volume fraction of the suspension, and the solvent viscosity of the host. Several models have been proposed in the literature describing the relative viscosity as a function of concentration. This study …
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Switching observer design, consensus management, and time-delayed control with applications for rigid-body attitude dynamics
… this dissertation provides a new switching angular velocity observer formulation to the classical problem of rigid body attitude tracking in the absence of angular rate measurements. Exponential convergence of the angular velocity state estimation errors is proven independent of control …
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NONLINEAR OBSERVER/CONTROLLER DESIGNS FOR SPACECRAFT ATTITUDE CONTROL SYSTEMS WITH UNCALIBRATED GYROS
… to be Lyapunov stable. Additionally, if the angular velocity meets a persistency of excitation (PE) condition, the scale factor and alignment observers are exponentially stable. Finally, the three observers are combined, and the combination is shown to be stable, with exponential stability if …
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Computer vision-based localization and mapping of an unknown, uncooperative and spinning target for spacecraft proximity operations
… if the target object is spinning with signicant angular velocity, it is also important to know the linear and angular velocity of the target object as well as its center of mass, principal axes of inertia and its inertia matrix. This information is essential to being able to propagate the state …
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