Publications associées à Sensitivity and open-loop control of stochastic response in a noise amplifier flow: the backward-facing step

Virtual Submodule Concept for Fast Semi-Numerical Modular Multilevel Converter Loss Estimation

Drazen Dujic, Alexandre François Christe

During the design phase of a modular multilevel converter (MMC), an accurate loss evaluation of the submodule (SM) plays an important role. In this paper, a method based on the analytical description of the MMC key waveforms that allows to directly obtain ...

Institute of Electrical and Electronics Engineers2017

Noise analysis of genome-scale protein synthesis using a discrete computational model of translation

Vassily Hatzimanikatis, Julien Racle, Adam Stefaniuk

Noise in genetic networks has been the subject of extensive experimental and computational studies. However, very few of these studies have considered noise properties using mechanistic models that account for the discrete movement of ribosomes and RNA pol ...

Amer Inst Physics2015

Recent trends in low-frequency noise reduction techniques for integrated circuits

Christian Enz, Assim Boukhayma

This paper presents the two main circuit techniques, namely autozeroing (AZ) and chopper stabilization (CS), that are used to reduce the 1/f noise and offset in amplifiers typically used in sensor electronics interfaces. After recalling their main properti ...

2015

Experiments of flow separation at the inner bank of open-channel bends

Anton Schleiss, Koen Blanckaert, Joris Heyman

In spite of its hydraulic and morphologic importance, the conditions of occurrence of flow separation at the inner bank of open channel bends are still not known. In a series of 23 experiments in a laboratory open channel bend with flat sand bed, it was in ...

2015

Sensitivity of stochastic perturbations in a noise amplifier flow

François Gallaire, Edouard Boujo

It is a well-known fact that small-amplitude perturbations can be amplified in globally stable flows due to non-normal mechanisms. This leads in the time domain to the transient growth of some initial disturbances, and in the frequency domain to the amplif ...

2014

An adjoint-based approach to the optimal control of separated flows

Edouard Boujo

Flow separation is relevant to many industrial applications, since it is detrimental to the aerodynamic performance of vehicles, induces vibrations in mechanical structures, but can also contribute to improve mixing in combustion devices. In this thesis, t ...

EPFL2014

Open-loop control of a separated boundary layer

François Gallaire, Edouard Boujo

Linear optimal gains

G_{opt}(\omega)

are computed for the separated boundary-layer flow past a two-dimensional bump in the subcritical regime. Very large values are found, making it possible for small-amplitude noise to be strongly amplified and to desta ...

Elsevier France-Editions Scientifiques Medicales Elsevier2014

Open-loop control of noise amplification in separated boundary layers

François Gallaire, Edouard Boujo

Linear optimal gains are computed for the subcritical two-dimensional separated boundary-layer flow past a bump. Very large optimal gain values are found, making it possible for small-amplitude noise to be strongly amplified and to destabilize the flow. Th ...

2013

Forced reattachment in separated flows: a variational approach to recirculation length reduction

François Gallaire, Edouard Boujo

Sensitivity analysis is used to design an open-loop control for separated flows. The length of the recirculation region

l_c

is expressed as a cost functional, and its sensitivity to actuation is derived analytically. This analysis allows to identify regi ...

2013

A real-time control system architecture for industrial power amplifiers

Faran Ahmed Qureshi

Power amplifiers are a highly important component in a range of industrial applications, such as, servo-drives, magnetic resonance imaging, energy systems, and audio. The control system for power amplifiers should satisfy a range of requirements, e. g., of ...

Ieee2013

Sensitivity and open-loop control of stochastic response in a noise amplifier flow: the backward-facing step

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Virtual Submodule Concept for Fast Semi-Numerical Modular Multilevel Converter Loss Estimation

Noise analysis of genome-scale protein synthesis using a discrete computational model of translation

Recent trends in low-frequency noise reduction techniques for integrated circuits

Experiments of flow separation at the inner bank of open-channel bends

Sensitivity of stochastic perturbations in a noise amplifier flow

An adjoint-based approach to the optimal control of separated flows

Open-loop control of a separated boundary layer

Open-loop control of noise amplification in separated boundary layers

Forced reattachment in separated flows: a variational approach to recirculation length reduction

A real-time control system architecture for industrial power amplifiers

Recent trends in low-frequency noise reduction techniques for integrated circuits

Open-loop control of noise amplification in separated boundary layers

A real-time control system architecture for industrial power amplifiers

Experiments of flow separation at the inner bank of open-channel bends

An adjoint-based approach to the optimal control of separated flows

Forced reattachment in separated flows: a variational approach to recirculation length reduction

Virtual Submodule Concept for Fast Semi-Numerical Modular Multilevel Converter Loss Estimation

Sensitivity of stochastic perturbations in a noise amplifier flow

Noise analysis of genome-scale protein synthesis using a discrete computational model of translation

Open-loop control of a separated boundary layer