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Ivancevic_Applied-Diff-Geom

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540 <strong>Applied</strong> <strong>Diff</strong>erential <strong>Geom</strong>etry: A Modern IntroductionFig. 4.2 The so–called ‘Lie bracket motion’ is possible by appropriately modulating thecontrol inputs (see text for explanation).where ∇f = ∂f/∂x is the Jacobian matrix. We can define Lie bracketsrecursively,Ad 0 f g = g,Ad i f g = [f, Ad i−1fg], (for i = 1, 2, ...)Lie brackets have the properties of bilinearity, skew–commutativity andJacobi identity.For example, if( cos x2f =x 1), g =( )x1,1then we have( ) ( ) ( ) ( ) ( )1 0 cos x2 0 − sin x2 x1 cos x2 + sin x[f, g] =−=2.0 0 x 1 1 0 1−x 1Input/Output Linearization.(SISO) systemGiven a single–input single–outputẋ = f(x) + g(x) u, y = h(x), (4.44)we want to formulate a linear–ODE relation between output y and a newinput v. We will investigate (see [Isidori (1989); Sastri and Isidori (1989);Wilson (2000)]):• How to generate a linear input/output relation.• What are the internal dynamics and zero–dynamics associated with theinput/output linearization?• How to design stable controllers based on the I/O linearization.

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