Publications related to Response of noise-amplifier flows: From linear control to nonlinear jet breakup

Self-sustained dynamics and forced resonant oscillations in flows: cross-junction jets and sloshing liquids

In engineering, oscillatory instabilities and resonances are often considered undesirable flow features and measures are taken to avoid them. This may include avoiding certain parametric regions or implementing control and mitigation strategies. However, t ...

EPFL2023

Distributionally Robust Linear Quadratic Control

Daniel Kuhn, Bahar Taskesen, Cagil Kocyigit

Linear-Quadratic-Gaussian (LQG) control is a fundamental control paradigm that is studied in various fields such as engineering, computer science, economics, and neuroscience. It involves controlling a system with linear dynamics and imperfect observations ...

2023

Liquid film instability of an internally coated horizontal tube

François Gallaire, Edouard Boujo, Yves-Marie François Ducimetière, Shahab Eghbali

We study numerically and theoretically the gravity-driven flow of a viscous liquid film coating the inner side of a horizontal cylindrical tube and surrounding a shear-free dynamically inert gaseous core. The liquid-gas interface is prone to the Rayleigh-P ...

AMER PHYSICAL SOC2023

Gyrokinetic simulation of short wavelength ion temperature gradient instabilities in the ADITYA-U tokamak

Laurent Villard, Emmanuel Lanti

In this work, linear and nonlinear collisionless electrostatic simulation studies of the standard and short wavelength ion temperature gradient mode (SWITG) for experimental profiles and parameters of ADITYA-U tokamak are performed using the linear global ...

IOP Publishing Ltd2023

A Distributed Luenberger Observer for Linear State Feedback Systems With Quantized and Rate-Limited Communications

Colin Neil Jones, Ye Pu, Andrea Alessandretti, Francisco Fernandes Castro Rego

This article addresses the problem of simultaneous distributed state estimation, and control of linear systems with linear state feedback, subjected to process, and measurement noise, under the constraints of quantized, and rate-limited network data transm ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2021

The effects of Prandtl number on the nonlinear dynamics of Kelvin-Helmholtz instability in two dimensions

Jeremy Peter Parker

It is known that the pitchfork bifurcation of Kelvin-Helmholtz instability occurring at minimum gradient Richardson number Ri(m) similar or equal to 1/4 in viscous stratified shear flows can be subcritical or supercritical depending on the value of the Pra ...

2021

On the effect of linear feedback and parametric pumping on a resonator's frequency stability

Luis Guillermo Villanueva Torrijo

Resonant sensors based on micro- and nano-electro mechanical systems (M/NEMS) are ubiquitous in many sensing applications due to their outstanding performance capabilities, which are directly proportional to the quality factor (Q) of the devices. We addres ...

2020

System-level, Input-output and New Parameterizations of Stabilizing Controllers, and Their Numerical Computation

Maryam Kamgarpour, Luca Furieri, Na Li

It is known that the set of internally stabilizing controller

\mathcal{C}_{\text{stab}}

is non-convex, but it admits convex characterizations using certain closed-loop maps: a classical result is the {Youla parameterization}, and two recent notions are t ...

2020

Sample and Average Common-Mode Feedback in a 101 nW Acoustic Amplifier

Kyojin Choo

We present a Sample and Average Feedback Resistor (SAFR) for accurate and programmable common-mode feedback in capacitively coupled low-power amplifiers. Using only switches, clocks, and capacitors, we reduce the variation across process and temperature by ...

IEEE2020

Adaptive model predictive control for linear time varying MIMO systems

Vojislav Gligorovski

A robust, adaptive Model Predictive Control (MPC) approach for asymptotically stable, constrained linear time-varying (LTV) systems with multiple inputs and outputs is proposed. The approach consists of two-steps, carried out on-line with a receding horizo ...

2019

Response of noise-amplifier flows: From linear control to nonlinear jet breakup

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Self-sustained dynamics and forced resonant oscillations in flows: cross-junction jets and sloshing liquids

Distributionally Robust Linear Quadratic Control

Liquid film instability of an internally coated horizontal tube

Gyrokinetic simulation of short wavelength ion temperature gradient instabilities in the ADITYA-U tokamak

A Distributed Luenberger Observer for Linear State Feedback Systems With Quantized and Rate-Limited Communications

The effects of Prandtl number on the nonlinear dynamics of Kelvin-Helmholtz instability in two dimensions

On the effect of linear feedback and parametric pumping on a resonator's frequency stability

System-level, Input-output and New Parameterizations of Stabilizing Controllers, and Their Numerical Computation

Sample and Average Common-Mode Feedback in a 101 nW Acoustic Amplifier

Adaptive model predictive control for linear time varying MIMO systems

Liquid film instability of an internally coated horizontal tube

Gyrokinetic simulation of short wavelength ion temperature gradient instabilities in the ADITYA-U tokamak

The effects of Prandtl number on the nonlinear dynamics of Kelvin-Helmholtz instability in two dimensions

Distributionally Robust Linear Quadratic Control

Self-sustained dynamics and forced resonant oscillations in flows: cross-junction jets and sloshing liquids

System-level, Input-output and New Parameterizations of Stabilizing Controllers, and Their Numerical Computation

Adaptive model predictive control for linear time varying MIMO systems

Sample and Average Common-Mode Feedback in a 101 nW Acoustic Amplifier

A Distributed Luenberger Observer for Linear State Feedback Systems With Quantized and Rate-Limited Communications

On the effect of linear feedback and parametric pumping on a resonator's frequency stability