Geometric Control Theory
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1 1 Geometric Control Theory Lecture notes by Xiaoming Hu and Anders Lindquist in collaboration with Jorge Mari and Janne Sand 2012 Optimization and Systems Theory Royal institute of technology SE Stockholm, Sweden 1 This work is partially based on the earlier lecture notes by Lindquist, Mari and Sand.
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3 Contents Preface Notations and definitions vii ix Chapter 1. Introduction Linear and nonlinear systems The geometric approach 4 Chapter 2. Invariant and controlled invariant subspaces Invariant subspaces Controlled invariant subspaces Reachability subspaces Maximal reachability subspaces Reachability under state constraints 19 Chapter 3. The disturbance decoupling problem (DDP) Geometric formulation Computing V Disturbance decoupling, observability, and zeros Disturbance decoupling with eigenvalue assignment Solution of the DDPP Is it necessary that Im E R? 29 Chapter 4. Zeros and zero dynamics Zero dynamics for SISO systems Zero dynamics of MIMO systems Zeros and system inversion An illustration of zero dynamics: high gain control 1 38 Chapter 5. Noninteracting control and tracking Noninteracting control Tracking with stability 44 Chapter 6. Input-output behavior State observation Output tracking input The partial stochastic realization problem 51 Chapter 7. Output regulation and internal model principle 55 iii
4 iv CONTENTS 7.1. Full information output regulation Error feedback output regulation Output regulation and zero dynamics 59 Chapter 8. Nonlinear systems Introduction Controllability Stability of nonlinear systems Steady state response and center manifold Center Manifold Theory Zero dynamics and its applications Disturbance decoupling problem (DDP) Output regulation Exact linearization via feedback 77 Chapter 9. Multi-Robotic Systems Consensus problem Formation control Formation control with limited sensor information 85 Appendix A. Numerical aspects in geometric control 89 A.1. Introduction 89 A.2. Representation of linear model 90 A.3. The singular value decomposition 92 A.4. A list of useful MATLAB commands 95 Appendix. Bibliography 101 Appendix. Index 103
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7 Preface Various versions of the notes have been used for the course Geometric Control Theory given at the Royal Institute of Technology (KTH), and its predecessor Advanced Systems Theory. The first version was written by Anders Lindquist and Janne Sand, and was later revised and extended by Jorge Mari. A major revision and addition was done by Xiaoming Hu in I would like to express my gratitude to Dr Ryozo Nagamune and Docent Ulf Jönsson for their careful reading and constructive comments on the 2002 version of the notes. Some minor changes and updates have been made every year since In 2006, some new material was added and the title was changed to Geometric Control Theory ; In 2012 Chapter 9 was rewritten. Xiaoming Hu October, 2012 vii
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9 Notations and definitions For easy reference we recall here some notations and definitions. Assume X and Y are finite dimensional vector spaces over the real field. Let n be the dimension of X, which is then isomorphic to R n. (1) Image space. GivenamapA : X Y,theimage space of A is defined as Im A := {y Y : y = Ax, for some x X}. It is a subspace of Y. We shall often use the same symbol for the map A as for its matrix representation once bases in X and Y have been chosen. (2) Linear span. Given a vector space V over the field R,letv 1,,v m V. The span of these vectors is span{v 1,,v m } = {α 1 v α m v m α 1,,α m R}. (3) Null space. GivenamapA : X Y,thenull space,orkernel, of A is defined as ker A := {x X : Ax =0}. It is a subspace of X. (4) Preimage. LetW be any set of Y. Thepre-image of W under the map A is A 1 W := {x X : Ax W}. Observe that A need not be invertible, so beware of the distinction between preimage and inverse. (5) A-invariant subspace. A subspace V of X is A-invariant if AV V. (6) Reachable subspace. Given the pair of conformable matrices A n n and B n k,thereachable subspace of (A, B), denoted by A Im B, is defined as A Im B := Im Γ, where Γ is the reachability matrix [BAB... A n 1 B]. This is an n nk matrix. The reachable subspace is A-invariant. (7) A Im E. The minimal A-invariant subspace that contains the subspace Im E is denoted by A Im E. ix
10 x NOTATIONS AND DEFINITIONS (8) Reachability subspace. Given a matrix pair (A, B), a subspace R is called a reachability subspace if there are matrices F and G such that R = A + BF Im BG. (9) Unobservable subspace. Given the matrix pair (C, A), the unobservable subspace is defined as ker Ω, where Ω is the observability matrix C CA. CA n 1 The unobservable subspace is A-invariant. (10) The map A is injective if Ax 1 = Ax 2 implies x 1 = x 2. (11) If A : X Yand V X,therestriction of A to V is denoted by A V. (12) Given the two finite-dimensional subspaces V and W, thevector sum is defined as V + W := {v + w : v V,w W}. If V and W are linearly independent we write the sum as V W. Note that in these notes does not denote orthogonal vector sum! (13) Hypersurface. Suppose N is an open set in R n.thesetm is defined as M = {x N : λ i (x) =0,i =1,...,n m} where λ i are smooth functions. λ 1 x If rank. = n m x M, thenm is a (hyper)surface λ n m x of dimension m. (14) Lie derivative. In local coordinates, Lie derivative is represented by n λ L f λ := f i, x i i=1 where f is a vector and λ is a scalar function. (15) Lie bracket. Lie bracket of the two vector fields f and g is defined according to the rule: [f,g](λ) :=L f L g λ L g L f λ.
11 NOTATIONS AND DEFINITIONS xi In local coordinates the expression of [f,g] is given as g x f f x g.
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