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 45 for “"sloshing"”.
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Granular sloshing absorbers for vibration control
… damping device, that uses a granular material sloshing in a rotating cylindrical container as the energy sink. Tuning of a granular sloshing absorber is shown to be effective using a laboratory prototype, increasing the inherent damping of the structure by two orders of magnitude with an added …
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Liquid sloshing in containers with flexibility
Sloshing is the low frequency oscillations of the free surface of a liquid in a partially filled container. The dynamic response of structures holding the liquid can be significantly influenced by these oscillations, and their interaction with the sloshing liquid could lead to instabilities. It is …
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Multifunctionality of distributed sloshing dampers in buildings
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002.
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Maneuvering Control of a Spacecraft with Propellant Sloshing
… and structural complexity. In this research, the sloshing fuel mass is treated as an unactuated degree of freedom within a rigid body. Specifically, the propellant is modeled as a pendulum mass anchored at the center of a spherical tank. After obtaining the coupled equations of motion, several …
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Liquid sloshing in containers : its utilisation and control
Sloshing is the oscillation of a contained liquid. In the first part of this thesis, the interaction between liquid sloshing and a mechanical oscillator has been exploited to control resonant vibrations of the oscillator. A deep-liquid-level sloshing absorber is presented as a practical alternative …
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Improving the design of travelling wave type sloshing absorbers
Liquid sloshing absorbers are simple structures consisting of a partially full container of liquid with a free surface. The primary objective of this thesis is to investigate the potential to improve the design of rectangular sloshing absorbers through attaching surface roughness elements …
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Design of effective traveling wave sloshing absorbers for structural control
A liquid sloshing absorber is a container partially filled with liquid. The primary objective of this thesis is to contribute to the understanding of rigid liquid sloshing absorbers with shallow depths, in structural control applications. An effective means of using intentionally induced liquid …
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Sloshing tank to enhance WEC performance: Modelling, validation and integration
L'abstract è presente nell'allegato / the abstract is in the attachment
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Effects of baffles on damping lateral fluid sloshing oscillations in tanker trucks
… of the high center of gravity and dynamic sloshing of the liquid payload. Payloads are often toxic and hence, rollover accidents can be catastrophic. Therefore, attempts to increase the threshold velocity and predicting its value under various on-road maneuvers are of paramount …
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Low-Gravity Sloshing in Spherical Tanks: Experimental Investigation Toward Numerical and Analytical Modeling
Uncontrolled sloshing in spacecraft propellant tanks can severely disturb vehicle attitude and dynamics, jeopardizing critical proximity maneuvers. Despite decades of research, the dynamics of low-gravity sloshing remain insufficiently understood and difficult to model with reliability, also due to …
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Simulation of Multi-Layer-Liquid Sloshing Effects on Vessel Motions by Using Moving Particle Simulation
… between ship motions and inner-liquid tank sloshing have been investigated by a coupled program between ship motion and sloshing analysis programs. For the sloshing program, Moving Particle Simulation (MPS), which is based on the Lagrangian approach, is used. This sloshing program is …
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A phenomenological rapid sloshing model for use as an operator guidance system on liquefied natural gas carriers
A concept for a non-intrusive sloshing guidance system based on a phenomenological Rapid Sloshing Model is proposed to reduce the operational risk of sloshing damage to LNG carriers. A numerical sloshing model is implemented in a commercial Navier-Stokes Computational Fluid Dynamics (CFD) code …
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Liquid Slosh Analysis Using Smoothed Particle Hydrodynamics
… for propellant slosh simulations. Simulated sloshing liquid frequency and damping ratio data for 1g cases has been compared to existing experiments for both spherical and prismatic container geometries. The 0g case has been studied to determine what further modifications would be required to …
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Modelo numérico de efeitos hidrodinâmicos em escoamentos internos e externos
… walls; several cases of internal flow, dambreak, sloshing and sloshing with mass transfer in a 2D box were studied and compared with experimental results, showing good results.
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Effects of Interfaces and Interactions between Multiphase Flow and Solid on Engineering Structures
… behaviors involved. The effects of liquid sloshing on a container mounted on a carrier are studied from an equivalent mechanical model of liquid sloshing in the container. The nonlinear mechanical model is presented and inviscid and viscous liquids are considered and compared for their …
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Dynamic stability of an elliptical pendulum with unilateral simple supports
… use of mechanical pendulums to substitute the sloshing dynamics of the fluid. Cylindrical tanks have been effectively characterized by simple pendulums combined with some fixed masses. Just recently, a WVU team proposed the use of an elliptical pendulum to substitute the sloshing dynamics in …
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Comparison of Guidance Methods for Autonomous Planetary Lander
… of motion for an arbitrary planetary lander with sloshing fuel and a gimbaled nozzle are derived using a Newtonian approach. A six degree of freedom (6DOF) simulation of the vehicle system dynamics is programmed in Simulink to test the various guidance methods. The guidance methods are assessed …
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The instability of axial-symmetric gravity-capillary waves generated by a vertically-oscillating sphere
… phenomena widely seen in lab model tests such as sloshing, ship model wakes measurements, etc. Despite its fundamental importance, the mechanism that governs the occurrence of this phenomenon is still unknown. The objective of this thesis is to understand the mechanism of this instability …
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Linear 1-D analysis of oscillation instabilities in stationary plasma thrusters
… a fundamental harmonic of 74.2 kHz, exhibited a sloshing type of behavior and was found to have several characteristics of a predator-prey type cycle. Although all modes were found to be highly damped, contrary to the existence of oscillation instabilities, it is believed that an …
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