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1
Content available Fluidic generator of microbubbles : oscillator with gas flow reversal for a part of period
Tesař V.
Acta Mechanica et Automatica
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2015
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Vol. 9, no. 4
195--203
EN
Paper presents a fluidic device developed for generation of small (less than 1 mm in diameter) microbubbles in a liquid from gas passing gas through small passages. Until now the bubbles are larger than the size of aerator passage exits so that making the passages smaller did not result in obtaining the desirable microbubbles. Analysis of high-speed camera images (obtained with a special lens of large working distance) have shown show that the large bubble size is caused by slow ascent motion of very small bubbles so that they get into mutual contact and grow by conjunction. The solution is to pulsate the supplied gas flow by a no-moving-part fluidic oscillator. The gener-ated small bubble is moved back into the aerator passage where it is for a part of oscillation period protected from the conjunction with other, previously generated microbubbles.
2
Content available Electromechanical system-in-package carbon nanotube VCO
Kauth C., Pastre M., Kayal M.
International Journal of Microelectronics and Computer Science
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2013
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Vol. 4, nr 4
153--158
EN
Encapsulated tunable electromechanical oscillators are a milestone on the road to smart dust sensor nodes. To foster the advent of ultrahigh system sensitivity thanks to novel technologies, a computationally light analytical and semi-empirical model for carbon nanotube resonator dynamics, electromechanical and piezoresistive properties is presented. This model is the breeding ground for the subsequent design and integration of a phase locked loop and feedback circuitry, which form an adaptive closed-loop oscillator for actuation, detection and sustainment of the nanotube’s motion. Closed-loop operation and tube stretching make the system Widely universal and invariant to spreads in nanotube characteristics.
3
Content available Low-noise Wideband Circuit for Closed-loop RF CNT-NEMS Sensors
Kauth C., Pastre M., Kayal M.
International Journal of Microelectronics and Computer Science
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2012
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Vol. 3, nr 2
67-72
EN
Hybrid NEMS interfaces are the key to systems combining the benefits of highly sensitive miniaturized mechanical sensors with the vast functionalities available in electronics. In this context, a phase-locked loop, locking on a suspended resonating carbon nanotube NEMS, is implemented and characterized, able to start, track, amplify and sustain NEMS oscillation up to 100MHz in a sensing environment. Detection of the signals out of the NEMS has been found most challenging and diverse RF front-ends meant for interfacing high-impedance carbon nanotube based NEMS are analyzed. Given the feeble signals from the NEMS, their high output impedance and non-negligible interconnect parasitics, front-end design must imperatively focus on minimal noise figure. Limits on minimal detectable signal are extracted via design, simulation and characterization of a 3-stage common-emitter front-end.
4
Content available Synchronisation and periodisation of duffing oscillators coupled by elastic beam: finite element method approach
Chudzik A.
Journal of Theoretical and Applied Mechanics
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2010
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Vol. 48 nr 2
517-524
EN
Results of numerical analysis of a structure witch consists of two identical chaotic oscillators suspended on an elastic element are presented. The numerical calculations have been carried out with the use of the professional ANSYS software (User's Gude ANSYS 10). The findings show that for given conditions of the excitation, the initially uncollerated chaotic oscillations of the structure become periodic and synchronous.
PL
W artykule przedstawiono wyniki analizy numerycznej struktury składającej się z dwóch identycznych chaotycznych oscylatorów zawieszonych na sprężystej belce. Obliczenia numeryczne przeprowadzono stosując profesjonalny pakiet programu ANSYS. Wykazano, że dla danych warunków wzbudzenia, początkowo nie są skorelowane, chaotyczne oscylacje struktury stają się okresowe i synchroniczne. W warunkach, kiedy częstości wzbudzenia różnią się, zjawiska powyższe nie występują.
5
Content available remote Dynamics of System Coupled by Elastic Structures
Chudzik A.
Machine Dynamics Problems
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2009
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Vol. 33, No. 1
16-22
EN
The subject under consideration is the dynamics of two non-linear chaotic oscillators attached to an elastic beam. Duffing oscillators are stimulated by a periodic signal at w frequency. The conclusion is that for given conditions initially uncorrelated chaotic oscillators becomes periodic and synchronous as a result of interaction with the elastic beam. Another interesting observation concerns the responses of the elastic beam and the oscillators to the excitations without the synchronization of their oscillations. The numerical calculations has been achieved with the use professional ANSYS program.
6
Content available remote Synchronization of mechanical systems driven by chaotic excitation
Stefański A.
Vibrations in Physical Systems
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2002
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Vol. 20
270--271
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