Vortex-Induced Vibration (VIV)
Reduced-order modeling, consistent derivation of wake oscillators, analysis of stability thresholds and non-stationary complex dynamics.
Reduced-order modeling, consistent derivation of wake oscillators, analysis of stability thresholds and non-stationary complex dynamics.
Phase-Noise Reduction in MEMS Based Oscillators
Theory of noise in oscillators, synchronization of oscillators, means to exploit nonlinearity to reduce phase noise.
Theory of noise in oscillators, synchronization of oscillators, means to exploit nonlinearity to reduce phase noise.
Three order of magnitude phase noise reduction due to nonlinear synchronization enhancement: (left) simplified circuit schematic of the experimental setup, (center) nonlinear synchronization domain enhancement (solid lines - model, red dots - measurements), (right) phase-noise reduction (model vs measurements). *Experimental measurements were done by Tom Kenny group, Micro Structures and Sensors Laboratory at Stanford University
Nonlinear Modal Interaction in MEMS Resonators
Internal resonances, bifurcations analysis, amplitude and frequency saturation, induced nonlinear damping due to modal coupling.
Internal resonances, bifurcations analysis, amplitude and frequency saturation, induced nonlinear damping due to modal coupling.
3:1 internal resonance in micromechanical beam: (left) SEM of the micromechanical beam and the two modes of interest, (center) bifurcation diagram (model vs measurements), (right) representative response curves. *Experimental measurements were done by Daniel López group,
Nanofabrication and Devices at Argonne National Laboratory