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7.3. INPUT-TO-STATE STABILITY (ISS) THEOREMS which is (7.8). To see (7.9) notice that Thus 7.3.1 Examples IMx(t)JI < max{Q(IIxol(,t),y(Ilutlloo)} Vt> 0, 0 X(IjuII). To this end we proceed by adding and subtracting aOx4 to the right-hand side of (7.12), where the parameter 0 is such that 0 < 0 < 1 provided that This will be the case, provided that V = -ax4 + aOx4 - aOx4 + xu = -a(1 - 9)x4 - x(aOx3 - u) < -a(1- 9)x4 = a3(IIx1I) x(aOx3 - u) > 0. aOIxI3 > Iul 189
190 CHAPTER 7. INPUT-TO-STATE STABILITY or, equivalently IxI > ( )1/3 a It follows that the system is globally input-to-state stable with ^j(u) _ " ( a B Example 7.3 Now consider the following system, which is a slightly modified version of the one in Example 7.2: x=-ax3+x2u a>0 Using the same ISS Lyapunov function candidate used in Example 7.2, we have that = -ax4 +x3u = -ax4 + aOx 4 - aBx4 + x3u 0 < 0 < 1 = -a(1 - 0)x4 - x3(a0x - u) < -a(1 - 0)x4, provided x3(a0x - u) > 0 or, lxI > I . Thus, the system is globally input-to-state stable with 7(u) = . Example 7.4 Now consider the following system, which is yet another modified version of the one in Examples 7.2 and 7.3: i=-ax3+x(1+x2)u a>0 Using the same ISS Lyapunov function candidate in Example 7.2 we have that -ax 4 + x(1 + x2)u -ax4 + aOx 4 - aOx 4 + x(1 + x2)u -a(1 - 0)x4 - x[aOx 3 - (1 + x2)u] < -a(1 - 9)x, 4 provided 1/3 0 0
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CONTROi I naiysis ana uesign (4)WIL
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Copyright © 2003 by John Wiley & S
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Contents 1 Introduction 1 1.1 Linea
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CONTENTS ix 3.8 The Invariance Prin
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CONTENTS xi 8.1 Power and Energy: P
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CONTENTS xiii A Proofs 307 A.1 Chap
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xvi 8, along with some of the most
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Chapter 1 Introduction This first c
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1.2. NONLINEAR SYSTEMS 3 with A=[-o
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1.3. EQUILIBRIUM POINTS 5 1.3 Equil
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1.4. FIRST-ORDER AUTONOMOUS NONLINE
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1.5. SECOND-ORDER SYSTEMS: PHASE-PL
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1.6. PHASE-PLANE ANALYSIS OF LINEAR
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1.7. PHASE-PLANE ANALYSIS OF NONLIN
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1.8. HIGHER-ORDER SYSTEMS 1.8.1 Cha
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1.9. EXAMPLES OF NONLINEAR SYSTEMS
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1.9. EXAMPLES OF NONLINEAR SYSTEMS
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1.10. EXERCISES 27 Figure 1.18: Bal
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1.10. EXERCISES 29 m2 Figure 1.19:
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Chapter 2 Mathematical Preliminarie
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2.3. VECTOR SPACES 33 (3) 3 0 E X :
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2.3. VECTOR SPACES 35 where the 1 e
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2.3. VECTOR SPACES 37 Proof: First
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2.4. MATRICES 39 2.4 Matrices We as
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2.4. MATRICES 41 Proof: By definiti
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2.4. MATRICES 43 (i) A is positive
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2.6. SEQUENCES 45 Compact set: A se
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2.7. FUNCTIONS 47 If f is a functio
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2.8. DIFFERENTIABILITY 2.8 Differen
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2.8. DIFFERENTIABILITY 51 Theorem 2
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2.9. LIPSCHITZ CONTINUITY 53 Notice
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2.10. CONTRACTION MAPPING 55 and th
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2.11. SOLUTION OF DIFFERENTIAL EQUA
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2.12. EXERCISES 59 Denoting t1 = to
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2.12. EXERCISES 61 (2.10) Show that
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2.12. EXERCISES 63 Notes and Refere
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66 CHAPTER 3. LYAPUNOV STABILITY I.
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72 CHAPTER 3. LYAPUNOV STABILITY I:
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100 CHAPTER 3. LYAPUNOV STABILITY I
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108 CHAPTER 4. LYAPUNOV STABILITY H
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126 CHAPTER 4. LYAPUNOV STABILITY H
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Chapter 5 Feedback Systems So far,
Page 156 and 157: 5.1. BASIC FEEDBACK STABILIZATION 1
Page 158 and 159: 5.2. INTEGRATOR BACKSTEPPING 141 5.
Page 160 and 161: 5.2. INTEGRATOR BACKSTEPPING 143 De
Page 162 and 163: 5.3. BACKSTEPPING: MORE GENERAL CAS
Page 168 and 169: 5.4. EXAMPLE 151 5.4 Example 8 Figu
Page 170 and 171: 5.5. EXERCISES 153 [S - 0(x)] = x1
Page 172 and 173: Chapter 6 Input-Output Stability So
Page 174 and 175: 6.1. FUNCTION SPACES 157 Both L2 an
Page 176 and 177: 6.2. INPUT-OUTPUT STABILITY 159 Thu
Page 178 and 179: 6.2. INPUT-OUTPUT STABILITY 161 (a)
Page 180 and 181: 6.2. INPUT-OUTPUT STABILITY 163 1.2
Page 182 and 183: 6.3. LINEAR TIME-INVARIANT SYSTEMS
Page 184 and 185: 6.4. L GAINS FOR LTI SYSTEMS where
Page 186 and 187: 6.5. CLOSED-LOOP INPUT-OUTPUT STABI
Page 188 and 189: 6.6. THE SMALL GAIN THEOREM 171 In
Page 190 and 191: 6.6. THE SMALL GAIN THEOREM 173 N(x
Page 192 and 193: 6.7. LOOP TRANSFORMATIONS 175 Figur
Page 194 and 195: 6.7. LOOP TRANSFORMATIONS 177 U l M
Page 196 and 197: 6.8. THE CIRCLE CRITERION 179 (i) g
Page 198 and 199: 6.9. EXERCISES 181 (6.3) Prove the
Page 200 and 201: Chapter 7 Input-to-State Stability
Page 202 and 203: 7.2. DEFINITIONS 185 Setting u = 0,
Page 204 and 205: 7.3. INPUT-TO-STATE STABILITY (ISS)
Page 208 and 209: 7.4. INPUT-TO-STATE STABILITY REVIS
Page 210 and 211: 7.4. INPUT-TO-STATE STABILITY REVIS
Page 212 and 213: 7.5. CASCADE-CONNECTED SYSTEMS U E2
Page 214 and 215: 7.5. CASCADE-CONNECTED SYSTEMS 197
Page 216: 7.6. EXERCISES 199 (i) Is it locall
Page 219 and 220: 202 CHAPTER 8. PASSIVITY v i Figure
Page 221 and 222: 204 CHAPTER 8. PASSIVITY Moreover,
Page 223 and 224: 206 CHAPTER 8. PASSIVITY Definition
Page 225 and 226: 208 CHAPTER 8. PASSIVITY Thus (UT,
Page 227 and 228: 210 CHAPTER 8. PASSIVITY Thus, H f
Page 229 and 230: 212 CHAPTER 8. PASSIVITY Under thes
Page 231 and 232: 214 CHAPTER 8. PASSIVITY Under thes
Page 233 and 234: 216 CHAPTER 8. PASSIVITY (i) H is p
Page 235 and 236: 218 CHAPTER 8. PASSIVITY Definition
Page 237 and 238: 220 CHAPTER 8. PASSIVITY Example 8.
Page 240 and 241: Chapter 9 Dissipativity In Chapter
Page 242 and 243: 9.2. DIFFERENTIABLE STORAGE FUNCTIO
Page 244 and 245: 9.3. QSR DISSIPATIVITY 227 Definiti
Page 246 and 247: 9.4. EXAMPLES 229 5- Very strictly-
Page 248 and 249: 9.5. AVAILABLE STORAGE 9.4.2 Mass-S
Page 250 and 251: 9.6. ALGEBRAIC CONDITION FOR DISSIP
Page 252 and 253: 9.6. ALGEBRAIC CONDITION FOR DISSIP
Page 254 and 255: 9.7. STABILITY OF DISSIPATIVE SYSTE
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9.8. FEEDBACK INTERCONNECTIONS 239
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9.8. FEEDBACK INTERCONNECTIONS 241
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9.9. NONLINEAR G2 GAIN 9.9 Nonlinea
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9.9. NONLINEAR L2 GAIN 245 (iii) IH
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9.10. SOME REMARKS ABOUT CONTROL DE
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9.10. SOME REMARKS ABOUT CONTROL DE
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9.11. NONLINEAR L2-GAIN CONTROL 251
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9.12. EXERCISES 253 9.12 Exercises
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Chapter 10 Feedback Linearization I
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10.1. MATHEMATICAL TOOLS 257 Lfh(x)
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10.1. MATHEMATICAL TOOLS 259 10.1.3
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10.1. MATHEMATICAL TOOLS 261 and su
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10.1. MATHEMATICAL TOOLS 263 Defini
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10.2. INPUT-STATE LINEARIZATION 265
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10.2. INPUT-STATE LINEARIZATION 267
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10.2. INPUT-STATE LINEARIZATION and
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10.3. EXAMPLES 271 provided that wh
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10.4. CONDITIONS FOR INPUT-STATE LI
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10.5. INPUT-OUTPUT LINEARIZATION 27
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10.6. THE ZERO DYNAMICS 281 i=Ax+Bu
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10.6. THE ZERO DYNAMICS 283 that th
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10.6. THE ZERO DYNAMICS 285 Definit
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10.7. CONDITIONS FOR INPUT-OUTPUT L
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10.8. EXERCISES 289 (10.8) Consider
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292 CHAPTER 11. NONLINEAR OBSERVERS
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308 APPENDIX A. PROOFS (ii) It is c
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310 APPENDIX A. PROOFS For the conv
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312 APPENDIX A. PROOFS 9V ax-1 xz 9
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314 APPENDIX A. PROOFS Since the eq
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316 APPENDIX A. PROOFS Proof: The n
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318 APPENDIX A. PROOFS We have x Fi
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320 APPENDIX A. PROOFS (b) 0 = a ,3
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322 APPENDIX A. PROOFS To this end
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324 A.5 Chapter 8 APPENDIX A. PROOF
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326 APPENDIX A. PROOFS and substitu
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328 APPENDIX A. PROOFS It follows t
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330 APPENDIX A. PROOFS A.7 Chapter
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332 APPENDIX A. PROOFS Assume now t
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334 APPENDIX A. PROOFS Multiplying
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Bibliography [1] B. D. O. Anderson
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BIBLIOGRAPHY 339 [27] W. Hahn, Stab
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BIBLIOGRAPHY 341 [58] E. Ott, Chaos
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BIBLIOGRAPHY 343 [87] A. van der Sc
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346 LIST OF FIGURES 3.1 Stable equi
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Index Absolute stability, 179 Asymp
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INDEX discrete-time, 132 nonautonom
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