Nonlinear Sciences – Chaotic Dynamics
Scientific paper
1997-05-22
Int. J. of Bifurcation and Chaos 8 (1998) 2449 - 2455
Nonlinear Sciences
Chaotic Dynamics
10 pages Latex, 5 ps-figures
Scientific paper
The challenging problems, in the field of control of chaos or of transition to chaos, lie in the domain of infinite-dimensional systems. Access to all variables being impossible in this case and the controlling action being limited to a few collective variables, it will not in general be possible to drive the whole system to the desired behaviour. A paradigmatic problem of this type is the control of the transition to turbulence in the boundary layer of fluid motion. By analysing a boundary layer flow for an ionized fluid near an airfoil, one concludes that active control of the transition amounts to the resolution of an generalized integro-differential eigenvalue problem. To cope with the required response times and phase accuracy, electromagnetic control, whenever possible, seems more appropriate than mechanical control by microactuators.
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