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 8 of 8 for “"Thermoelastic Damping"”.
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Finite element model of thermoelastic damping in MEMS
Damping in MEMS resonators was studied experimentally and numerically. Quality factor measurements were performed on Draper gyroscopes made from boron doped silicon wafers with varying amount of germanium (0%, 2%, 23%, 30% ). The quality factors of gyroscopes with germanium were measured to be …
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MEMS Transducer for Hearing Aid Device
… using finite element method. Further, a study of thermoelastic damping effect of four designed MEMS mirrors used as resonators is presented. An optical measurement system based on Mach-Zehnder interferometer is</p>
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Analysis and Approximation of Viscoelastic and Thermoelastic Joint-Beam Systems
… behavior of systems resulting from various damping models, including Kelvin-Voigt, Boltzmann, and thermoelastic damping. Approximation schemes will also be introduced. Finally, we look at optimal control for the Kelvin-Voigt model using a linear feedback regulator.
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Modeling and Simulation of Microelectromechanical Systems in Multi-Physics Fields
… electric actuation (AC and DC), squeeze-film damping, thermoelastic damping, and structural forces. The second objective is to investigate MEMS phenomena, such as squeeze-film damping and dynamic pull-in, and use the latter to design a novel RF-MEMS switch. In the first part of the …
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Nonlinear Dynamics of Electrostatically and Magnetically Actuated MEMS
… The effect of these complex oscillations on thermoelastic damping (an inherent dissipation mechanism that limits the quality factor of these devices) in electrostatic MEMS is also studied."
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Characterisation of mechanical loss in fused silica ribbons for use in gravitational wave detector suspensions
… LIGO. The measurements also showed a reduced thermoelastic damping effect from that theoretically calculated from which an altered value for the Young’s modulus of the fibres was found compared to the value for bulk fused silica. Measurements performed using the violin modes and pendulum modes …
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Multi-Physical Study of MEMS Resonators and Oscillators
… model has been derived to explain the damping dependent frequency shift characteristic of TPO. The solution of the model indicates that the stiffness of the actuator beam decreases as the value of damping coefficient drops at lower gas density caused by the change in the gas molecular …
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Untersuchung der Energiedissipationsprozesse mikromechanischer Systeme
Im Fokus dieser Arbeit stehen Dämpfungseffekte schwingfähiger Mikroelektromechanischer Systeme (MEMS), die nach dem kapazitiven Wirkprinzip arbeiten. Die verschiedenen Dissipationsprozesse und die zugehörigen analytischen Modelle sowie numerischen Berechnungsmöglichkeiten auf physikalischer Ebene …