Search Results - "Veijola, T."

Compact damping models for laterally moving microstructures with gas-rarefaction effects by Veijola, T., Turowski, M.

“…Compact models for the viscous damping coefficient in narrow air gaps between laterally moving structures are reported. In the first part of the paper, a…”
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Synthesis of Reduced Equivalent Circuits for Transmission Lines by Kallio, A., Veijola, T.

“…This paper presents a method for generating lumped models for symmetrical transmission-line two-ports. These models consist of an ideal transformer and…”
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Gas damping model for a RF MEM switch and its dynamic characteristics by Veijola, T., Tinttunen, T., Nieminen, H., Ermolov, V., Ryhanen, T.

“…A compact model for a capacitive RF MEM switch with damping is presented. The damping model is based on analytic expressions for flow resistances due to the…”
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Large-displacement modelling and simulation of micromechanical electrostatically driven resonators using the harmonic balance method by Veijola, T., Mattila, T., Jaakkola, O., Kiihamaki, J., Lamminmaki, T., Oja, A., Ruokonen, K., Seppa, H., Seppala, P., Tittonen, I.

“…Nonlinearities in electrostatically driven micromechanical resonators are studied with circuit simulations. Models for the resonators are built of elementary…”
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Numerical and compact modelling of squeeze-film damping in RF MEMS resonators by Veijola, T., Lehtovuori, A.

“…Oscillatory gas flow in squeeze-film dampers is studied up to frequencies where the length of the acoustic wave is comparable with the dimensions of the air…”
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Compact model for a cantilever beam MEM contact switch by Veijola, T.

“…A compact model for a cantilever beam microelectromechanical (MEM) contact switch is constructed. The beam deflection is modeled by discretizing the beam along…”
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Comparison between damping coefficients of measured perforated structures and compact models by Veijola, T., De Pasquale, G., Soma, A.

“…Measured damping coefficients of six different perforated micromechanical test structures are compared with damping coefficients given by published compact…”
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Equivalent-circuit model of the squeezed gas film in a silicon accelerometer by Veijola, Timo, Kuisma, Heikki, Lahdenperä, Juha, Ryhänen, Tapani

“…We present a new electric equivalent circuit for the forces created by a squeezed gas film between vertically moving planar surfaces. The model is realized…”
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Model for thermal spreading impedance in GaAs MESFETs by Veijola, T.

“…A simulation model for dynamic temperature response in GaAs MESFET structures is presented. In the model, the heated volumes below the gate fingers are…”
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Identification of cascaded microwave circuits with moderate reflections using reflection and transmission measurements by Veijola, T.V., Valtonen, M.E.

“…A method for identifying the component values of a cascaded microwave circuit with the aid of the time-domain reflection and transmission coefficients is…”
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The influence of gas-surface interaction on gas-film damping in a silicon accelerometer by Veijola, Timo, Kuisma, Heikki, Lahdenperä, Juha

“…A mathematical model for the effective viscosity of a gas film in small air gaps between silicon and metal surfaces is presented. The model is based on the…”
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Simple but Accurate Models for Squeeze-film Dampers by Veijola, T.

“…Simple but accurate compact models are derived for squeeze-film dampers having rectangular areas and vibrating in translational or in torsion motion. First,…”
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Model of capacitive micromechanical accelerometer including effect of squeezed gas film by Veijola, T., Ryhanen, T.

“…An electrical component model for a micromechanical accelerometer is presented. In addition to the varying capacitances, the motion of the seismic mass and the…”
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Model for gas film damping in a silicon accelerometer by Veijola, T., Kuisma, H., Lahdenpera, J.

“…A mathematical model for the effective viscosity of a gas film in small air gaps between silicon-metal surfaces is presented. The model is based on the…”
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Modeling of nonlinear micromechanical resonators and their simulation with the harmonic-balance method by Veijola, Timo, Mattila, Tomi

“…A model for a micromachined electrostatically driven high‐Q beam resonator is constructed of nonlinear voltage‐controlled current and charge sources. Its…”
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Transient capacitance measurement of MEM capacitor by Nieminen, Heikki, Hyyryläinen, Jari, Veijola, Timo, Ryhänen, Tapani, Ermolov, Vladimir

“…Previously, steady-state measurement methods have been used to characterize micro-electro-mechanical (MEM) capacitor performance during reliability testing and…”
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Compressible squeeze-films in vibrating MEMS structures at high frequencies by Veijola, T.

“…A simple model is presented to approximate the damping due to gas in vibrating MEMS squeeze-film structures at high frequencies. The model is based on the…”
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3D FEM simulations of perforated MEMS gas dampers by Veijola, T.

“…A 3D Navier-Stokes FEM solver was used to study the damping forces due to air flow in a perforated damper in translational motion normal to surfaces. Several…”
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Quality Factor and Resonance Frequency Shift Due to Air in RF MEMS Radial Disk Resonators by Veijola, T.

“…Damping due to air in RF MEMS disk resonators is studied with simulations. The fluid flow in the air gaps and around the oscillating structure is studied with…”
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Dynamic simulation model for a vibrating fluid density sensor by Veijola, Timo, Corman, Thierry, Enoksson, Peter, Stemme, Göran

“…A dynamic simulation model for a vibrating fluid density sensor is presented. The model includes electrostatic excitation, two torsional and two bending…”
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