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 24 for “"damping effects"”.
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Damping Effects of Drogue Parachutes on Orion Crew Module Dynamics
… deployed are under-predicting the amount of damping as seen in free-flight tests. The Apollo Legacy Chute Damping model has been resurrected and applied to the Orion system. The legacy model has been applied to predict CM damping under drogue parachutes for both Vertical Spin Tunnel free …
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Applying the Newmark Method to the Discontinuous Deformation Analysis
… for energy dissipation. But DDA usually exhibits damping effects that are inconsistent with theoretical solutions. The deep reason for these artificial damping effects has been an open question, and it is hypothesized that these damping effects could result from the time integration scheme. In …
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Elastic and inelastic responses of columns after sudden loss of bracing
… Galerkin’s method. With the consideration of the effects of the bracing location and the bracing stiffness, the maximum deflection of the column during motion is determined. The contribution of damping effects to the maximum deflection of the column is examined. Damping effects in the Galerkin …
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Forced oscillations in simple and binary gas atmospheric models
… but these have neglected to include the damping effects of heat conduction and viscosity. These also ignored the second order terms in the equations of motion which, in effect, treats an otherwise singular perturbation problem as regular. Upper atmosphere studies of the diurnal density …
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Damping of Vibration Using Periodically Voided Viscoelastic Metamaterials
This thesis investigates the damping effects of a metamaterial, on structural vibration, by inducing periodic voids in the base damping material as opposed to infusing the damping material with other material. Metamaterials have been used previously to improve the damping of vibrational waves and …
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Constructive utilization of intentional nonlinearity in systems of coupled micro/nanomechanical resonators
… considered as unwanted. In some works nonlinear effects are taken into account, but these are considered as perturbations of linear effects, and mostly explored in the regime of weakly nonlinear effects. Some additional recent works have focused on intentionally exploiting the rich dynamics …
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Calculation of Unbalanced Magnetic Pull in Cage Induction Machines
… leads to several new aspects of the damping effects of parallel stator windings and the cage rotor being highlighted.
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Spatio-temporal slope measurement of short wind waves under the influence of surface films at the Heidelberg Aeolotron
… on small-scale waves are reported. The wave damping effects of different substances are analyzed. It is shown that, except for low wind speeds, gas transfer velocities across the air-sea boundary layer can be parametrized with the mean square slope of the waves, independent of the specific …
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A computer implementation of the static and dynamic analysis of induced strain actuated beams
… patches on the beam structure, structural damping effects, and the effects of stiffening and mass loading due to the presence of the actuators. DAISA has been designed to perform static-response, free-vibration, steady-state harmonic-response, and frequency-response analyses describing the …
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Thermoelectric Magnetohydrodynamic Flows During Various Crystal Growth Processes With an Externally Applied Magnetic Field
… inertialess at the beginning and the convective effects emerge as the Reynolds number Re is increased for a particular case. For relatively weak magnetic field strength, the convective effects dominate the EM damping effects for very large Re. For weak magnetic field case, the convective effects …
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Three-Dimensional Nonlinear Dynamics of a Moored Cylinder to be Used as a Breakwater
… of the structure are considered. Linear damping is used to model the fluid and mooring damping effects. Normal and oblique harmonic wave forces at various frequencies and amplitudes are applied to the cylinder. The effects of the forcing amplitude and frequency, and the coefficient of …
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Effect of air on vibration of structures
… theory - are applied to derive solutions for damping ratios of air. Experiments such as an unbaffled plate experiment, a pendulum experiment and a baffled plate experiment are designed and conducted to observe the damping effect of air. Experimental results illustrate the applicability of the …
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Effects of baffles on damping lateral fluid sloshing oscillations in tanker trucks
… research was aimed at studying the effects of baffles on reducing the lateral sloshing and thereby, improving the stability of heavy-duty trucks. Various configurations (horizontal, vertical, horizontal and vertical, and diagonal) of baffles were considered for this purpose. The …
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Nonlinear Mr Model Inversion for Semi-Active Control Enhancement With Open-Loop Force Compensation
… to controlling dampers, the well-known Skyhook Damping control algorithm has enjoyed great success for both fully active and semi-active control problems. The Skyhook design strategy is to create a control force that emulates what a passive linear damper would create when connected to an …
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Dynamic analysis of magnetorheological elastomer configured sandwich structures
… of force amplitudes, boundary conditions and damping effects under localised magnetic fields to be made. In parallel to these experimental investigations, a new theoretical model was developed by combining the magnetisation effects on iron particles in terms of the curing times. In addition, a …
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Light scattering studies of heavy fermion and high Tc superconductors
… evident in CeCu2Si2, and are found to exhibit damping effects which are consistent with theoretical predictions. Finally, an investigation of the phonon spectra of several heavy fermion compounds presents evidence for anomalous magnetoelastic and deformation potential coupling in some heavy …
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Investigations on Void Formation in Composite Molding Processes and Structural Damping in Fiber-Reinforced Composites with Nanoscale Reinforcements
… vibrational loads during service, and improved damping characteristics of the composite structure are desirable. To this end, a second goal is to explore the use of matrix-embedded nanoscale reinforcements to augment the inherent damping capabilities in FRCs. The first objective is addressed …
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Structure and Persistence of Surface Ship Wakes
… includes turbulent hydrodynamics, free-surface effects, environmental forcing through Langmuir-type circulations, generation of surface currents and redistribution of surface-active substances, surface-roughness modification, and simulation of the signature generated by reflection and scattering …
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Collapse dynamics of ultrasound contrast agent microbubbles
… shells on the order of nanometers thick. The damping effects of these viscoelastic coatings are widely known to significantly alter the bubble dynamics for linear and low-amplitude behavior; however, their effects on strongly nonlinear and destruction responses are much less studied. This …
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