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7th IFAC Conference on Analysis and control of Nonlinear Dynamics and Chaos (ACNDC)

作者： Baker, Luke S. Zlotnik, Anatoly Los Alamos Natl Lab Div Theoret Ctr Nonlinear Studies Los Alamos NM 87544 USA Los Alamos Natl Lab Appl Math & Plasma Phys Grp Los Alamos NM USA

It is known that periodic forcing of nonlinear flows can result in a chaotic response under certain conditions. Such non-periodic and chaotic solutions have been observed in simulations of heterogeneous gas flow in a pipeline with periodic, time-varying boundary conditions. In this paper, we examine a proportional feedback law for boundary control of a parabolic partial differential equation system that represents the flow of two gases through a pipe. We demonstrate that periodic variation of the mass fraction of the lighter gas at the pipe inlet can result in the chaotic propagation of gas pressure waves, and show that appropriate flow control can suppress this response. We examine phase space solutions for the single pipe system subject to boundary control, and use numerical experiments to characterize conditions for the controller gain to suppress chaos. Copyright (C) 2024 The Authors. This is an open access article under the CC BY-NC-ND license (https://***/licenses/by-nc-nd/4.0/)

关键词： control of bifurcation and chaos control of renewable energy resources Energy control in transportation Output feedback control control of fluid flows and fluids-structures interactions

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Boundary control for Suppressing Chaotic Response to Dynamic Hydrogen Blending in a Gas Pipeline

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IFAC-PapersOnLine 2024年第5期58卷 72-77页

作者： Luke S. Baker Anatoly Zlotnik Center for Nonlinear Studies Theoretical Division Los Alamos National Laboratory Los Alamos NM USA Applied Mathematics & Plasma Physics Group Los Alamos National Laboratory Los Alamos NM USA

关键词： control of bifurcation and chaos control of renewable energy resources Energy control in transportation Output feedback control control of fluid flows and fluids-structures interactions

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Closed-loop control of a spatially developing free shear flow around a steady state

Closed-loop control of a spatially developing free shear flo...

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20th World Congress of the International-Federation-of-Automatic-control (IFAC)

作者： Anda-Ondo, D. Carlier, J. Collewet, C. Irstea UR Opaale F-35044 Rennes France INRIA Fluminance Project F-35042 Rennes France

This paper provides preliminary results on the closed-loop control of a spatially developing mixing-layer induced by two parallel incident streams with different velocities. The goal of the control law was to stabilize the flow around a desired state (known to reduce mixing). The way to achieve this flow control consists of linearizing the Navier-Stokes equations about the desired state, spatially discretizing the resulting linear system and determining the feedback gain according to an optimal control law. Actuations were located in the input boundary of the system. State of the flow was assumed to be reconstructed from image sensors. The control law has been validated on a realistic non-linear system (Navier-Stokes solver). More precisely, these simulation results have shown that perturbations can be efficiently rejected. (C) 2017, IFAC (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： control of fluid flows and fluids-structures interactions Output feedback control (linear case) Time-invariant systems

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