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 62 for “"viscous damping"”.
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Tailoring the Geometry of Micron Scale Resonators to Overcome Viscous Damping
… oscillations of micron scale beams in a viscous fluid, such as water, is an open challenge of direct relevance to the development of future technologies. We study the stochastic dynamics of doubly-clamped micron scale beams in a viscous fluid driven by Brownian motion. We use a …
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Equivalent Viscous Damping and Inelastic Displacement for Strengthened and Reinforced Masonry Walls
The masonry still one of the widespread construction system for low-rise residential buildings even for countries prone to seismic risk. Despite seismic design methods yet in use are force-based, in the last decades was highlighted as the differences in strength between two levels of damage is low, …
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A Numerical Model for Nonlinear Response of R/C Frame-Wall Structures
… to variations in initial stiffness, amount of viscous damping, and unloading slope of force-deformation curve was studied.
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The generation mechanisms of acoustic emission in metal cutting
… and due to the high strain rates, opposing viscous damping becomes the dominant mechanism governing dislocation movement). Although viscous damping governs the mechanics of deformation in metal cutting, it is proposed that AE is generated due to the interaction between dislocations and …
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Análise dinâmica linear de cascas axissimétricas com um elemento finito curvo
… by the Modal Superposition Method supposing a viscous damping by means of percentage of the criticai damping. The theory is applied in some numerical examples and the results are compared to those presented by other authors. The Automatic Program developed in FORTRAN-IV is also presented.
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A study of modal-space control of a beam-cable structure: experiment and theory
… implemented in analog form and provided modal viscous damping in each of the three modes of the structure. Transient response to initial conditions was analyzed experimentally and theoretically. Control hardware included permanent magnet-coil systems for the three control force actuators and …
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Damping and flexural properties of prestressed concrete members subjected to reversed cyclic loading
… structures, and examines the "equivalent viscous damping" approach to the measurement of structural damping. Part two describes the reversed cyclic testing of prestressed concrete members: end moments were applied to the members to simulate earthquake loading, and measurements were made of …
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Advanced experimental modelling of hydrodynamic and aerodynamic wakes in floating offshore wind turbines using particle image velocimetry
… dynamics (CFD) methods are employed to calibrate viscous damping coefficients in POT models to improve accuracy, their high computational cost limits practical use. The reliability of simplified CFD models for refining POT viscous damping remains unexplored, representing a clear knowledge gap. …
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Transfer matrix analysis of an electrohydraulically driven rotary- vibratory drilling system
… stiffness, internal material, and external fluid damping. These properties were introduced through a new continuum transfer matrix for a damped pipe element. The model allows for the inclusion of realistic geometrical representations for the drill string, and the inclusion of masses, springs, …
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Extension to Multiple Species of a Two-Equation Turbulence Model for High Speed Flows
… corrections are not required, nor are viscous damping factors or wall functions to produce the law of the wall, and it has previously been validated for approximately one hundred test cases ranging from incompressible to hypersonic flow regimes. Initial validation cases using …
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Modelling and Analysis of the Axial Vibration on BHA of Horizontal Drilling Rig
… such as weight on bit, friction coefficient, viscous damping coefficient, and the number of stabilizers. The dynamic mathematical model is validated by the finite element simulation and analysis. Moreover, it can monitor the deformation of BHA real time and help drillers adjusting the …
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A study of the maximum transient response of simple fully yielding structures
… elastoplastic system and the effect upon it of viscous damping and a transition region between the elastic and plastic states. The extension of the approach to the two degree of freedom elastoplastic system was also investigated. The study was undertaken within the context of the earthquake …
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Horizontal Stiffness of Wood Diaphragms
… are analyzed and compared in terms of equivalent viscous damping, global stiffness, shear stiffness, and flexural stiffness in order to evaluate the characteristics of each construction parameter and combinations thereof. Recommendations are presented at the end of this study as to the next steps …
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A moving mesh method for non-isothermal multiphase flows
… the simulation accuracy especially when the viscous damping is weak (small Ohnesorge number, $Oh$). For the example of a circular/spherical droplet, the interfacial tension and the associated pressure jump are exactly balanced numerically and thus the static Laplace solution exists in our …
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Design, Analysis, and Initial Testing of a Fiber-Optic Shear Gage for 3D, High-Temperature Flows
… housing as the primary measurement system. No viscous damping was required. The gage has both fiber-optic instrumentation and strain gages mounted on the flexures for validation of the newer fiber optics. The sensor is constructed of Haynes 230, a high-temperature nickel alloy. The gage housing …
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Novel probe structures for high-speed atomic force microscopy
… these stacked structures. By manipulating the viscous damping and mechanical mode coupling it becomes feasible to attain the aforementioned desired dynamic characteristics.
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Modelling of liquid droplet dynamics in a high DC magnetic field
… that is used to measure the surface tension and viscous damping coefficients of a liquid droplet. This technique has been the subject of much analysis; theoretical, numerical, and experimental with a number of different external forces used to confine the droplet. These external forces are found …
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A Study of Non-Fluid Damped Skin Friction Measurements for Transonic Flight Applications
… experience during transonic flight, a vibration damping mechanism needed to be implemented. Viscous damping had been used in previous attempts to passively dampen the vibrations of skin friction gages in other applications, yet viscous damping proved to be an undesirable solution due to its …
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Aptamer-based nano-scale dielectric sensor for protein detection
… to be sensitive, this mechanism suffered from viscous damping in liquid phase measurements. Therefore, a novel nanoscale dielectric sensor was developed capable of monitoring biomolecular recognition events in liquid phase with high sensitivity. The use of this sensor for attaining highly …
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