Control of Turbulent and Magnetohydrodynamic Channel Flows: by Rafael Vazquez, Miroslav Krstic

By Rafael Vazquez, Miroslav Krstic

This monograph offers new optimistic layout equipment for boundary stabilization and boundary estimation for a number of periods of benchmark difficulties in circulation keep watch over, with capability functions to turbulence regulate, climate forecasting, and plasma regulate. the foundation of the technique utilized in the paintings is the lately built non-stop backstepping technique for parabolic partial differential equations, increasing the applicability of boundary controllers for circulate platforms from low Reynolds numbers to excessive Reynolds quantity conditions.

Efforts in movement regulate over the past few years have ended in a variety of advancements in lots of diverse instructions, yet such a lot implementable advancements to this point were got utilizing discretized types of the plant versions and finite-dimensional keep watch over innovations. by contrast, the layout equipment tested during this ebook are in response to the “continuum” model of the backstepping technique, utilized to the PDE version of the move. The postponement of spatial discretization until eventually the implementation degree bargains a variety of numerical and analytical advantages.

Specific subject matters and features:

* creation of regulate and country estimation designs for flows that come with thermal convection and electrical conductivity, particularly, flows the place instability can be pushed by means of thermal gradients and exterior magnetic fields.

* software of a distinct "backstepping" procedure the place the boundary keep watch over layout is mixed with a specific Volterra transformation of the circulation variables, which yields not just the stabilization of the circulate, but additionally the categorical solvability of the closed-loop system.

* Presentation of a end result exceptional in fluid dynamics and within the research of Navier–Stokes equations: closed-form expressions for the recommendations of linearized Navier–Stokes equations below feedback.

* Extension of the backstepping method of cast off one of many well-recognized root reasons of transition to turbulence: the decoupling of the Orr–Sommerfeld and Squire systems.

Control of Turbulent and Magnetohydrodynamic Channel Flows is a wonderful reference for a vast, interdisciplinary engineering and arithmetic viewers: keep an eye on theorists, fluid mechanicists, mechanical engineers, aerospace engineers, chemical engineers, electric engineers, utilized mathematicians, in addition to learn and graduate scholars within the above components. The booklet can also be used as a supplementary textual content for graduate classes on regulate of distributed-parameter structures and on movement control.

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Extra info for Control of Turbulent and Magnetohydrodynamic Channel Flows: Boundary Stabilization and State Estimation

Sample text

This setup is known as anticollocated, since the measurement is done at the uncontrolled end. 126), we postulate an observer as a copy of the system plus injection of output error, times an output-injection gain. 165) where p1 (x) is an output-injection gain to be determined so that the estimate u ˆ converges to the state u. 168) which is autonomous in u ˆ. The gain p1 is designed to obtain exponential stability of the origin u ˆ ≡ 0, thus guaranteeing convergence of the estimate. 172) which is an exponentially stable system.

5. The kernel in this form can be calculated numerically, using a simple finite-difference scheme, or rewritten into an integral equation (useful for proving well-posedness and smoothness). 24) transforming the problem into the following PIDE: ξη 2 (ξ − η 2 )2 Gξη = 3 (ρ + ξ − η)2 − (ξ − η)2 × (ρ + ξ − η)(ξ − η) 2 ξη G − A12 2 ξ2 − 2η −π η2 0 ρ ρ G ξ + ,η − 2 2 dρ . 25) This equation can be transformed into a pure integral equation, doing several integrations and employing the boundary conditions, arriving at ξ G = −A12 η 2R1 +η σ2 2 0 η γσ − γ2 (2R1 + σ)γ dγdσ (2R1 + σ)2 − γ 2 × 2γ + 0 η σ 6e 0 2γ η−σ R1 0 0 A12 π e 0 ξ η−σ R1 0 η + 3 2R1 +η 0 (σ 2 γσ − γ 2 )2 G(γ, σ) (ρ + σ − γ)2 − (σ − γ)2 dρ dγdσ 2 (ρ + σ − γ)(σ − γ) ρ ρ A12 πG σ + , γ − 2 2 + σ dγdσ + (ρ + 2R1 + σ − γ)2 − (2R1 + σ − γ)2 6 (ρ + 2R1 + σ − γ)(2R1 + σ − γ) ρ G(γ, σ)(2R1 + σ)γ ρ dρ + ×G 2R1 + σ + , γ − 2 2 ((2R1 + σ)2 − γ 2 )2 dγdσ.

5, we postulate an observer as a copy of the system plus injection of output error modulated by a gain function. 183) where the output-injection gain p1 (x) needs to be determined to guarantee that the estimate u ˆ converges to the state u. 186) which is autonomous in u ˆ. 5, we seek a gain p1 that guarantees exponential stability of the origin uˆ ≡ 0, hence exponential convergence of the estimate. 190) which is an exponentially stable system. 187), is not lower-triangular, but is an upper-triangular transformation.

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