| Preface | p. vii |
| List of Figures | p. xix |
| List of Tables | p. xxi |
| Background and General Comments | p. 1 |
| Truly Nonlinear Functions | p. 1 |
| Truly Nonlinear Oscillators | p. 2 |
| General Remarks | p. 3 |
| Scaling and Dimensionless Form of Differential Equations | p. 5 |
| Linear Damped Oscillator | p. 5 |
| Nonlinear Oscillator | p. 6 |
| &xuml;+axp=0 | p. 7 |
| &xuml;+ax+bx1/3=0 | p. 8 |
| Exactly Solvable TNL Oscillators | p. 9 |
| Antisymmetric, Constant Force Oscillator | p. 10 |
| Particle-in-a-Box | p. 11 |
| Restricted Duffing Equation | p. 12 |
| Quadratic Oscillator | p. 14 |
| Overview of TNL Oscillator Methods | p. 14 |
| Harmonic Balance | p. 16 |
| Parameter Expansion | p. 16 |
| Averaging Methods | p. 17 |
| Iteration Techniques | p. 18 |
| Discussion | p. 18 |
| Problems | p. 20 |
| References | p. 21 |
| Establishing Periodicity | p. 23 |
| Phase-Space | p. 23 |
| System Equations | p. 24 |
| Fixed-Points | p. 24 |
| ODE for Phase-Space Trajectories | p. 25 |
| Null-clines | p. 25 |
| Symmetry Transformations | p. 26 |
| Closed Phase-Space Trajectories | p. 26 |
| First-Integrals | p. 26 |
| Application of Phase-Space Methods | p. 27 |
| Linear Harmonic Oscillator | p. 27 |
| Several TNL Oscillator Equations | p. 31 |
| Dissipative Systems: Energy Methods | p. 33 |
| Damped Linear Oscillator | p. 35 |
| Damped TNL Oscillator | p. 35 |
| Mixed-Damped TNL Oscillator | p. 36 |
| Resume | p. 39 |
| Problems | p. 39 |
| References | p. 40 |
| Harmonic Balance | p. 43 |
| Direct Harmonic Balance: Methodology | p. 44 |
| Worked Examples | p. 46 |
| &xuml;+x3=0 | p. 47 |
| &xuml;+x-1=0 | p. 49 |
| &xuml;+x2sgn(x)=0 | p. 51 |
| &xuml;+x1/3=0 | p. 54 |
| &xuml;+x-1/3=0 | p. 57 |
| Rational Approximations | p. 61 |
| Fourier Expansion | p. 62 |
| Properties of ak | p. 62 |
| Calculation of &xuml; | p. 63 |
| Worked Examples | p. 63 |
| &xuml;+x3=0 | p. 63 |
| &xuml;+x2sgn(x)=0 | p. 65 |
| &xuml;+x-1=0 | p. 66 |
| Third-Order Equations | p. 67 |
| Castor Model | p. 68 |
| TNL Castor Models | p. 69 |
| Resume | p. 70 |
| Advantages | p. 70 |
| Disadvantages | p. 70 |
| Problems | p. 71 |
| References | p. 72 |
| Parameter Expansions | p. 75 |
| Introduction | p. 75 |
| Worked Examples | p. 76 |
| &xuml;+x3=0 | p. 76 |
| &xuml;+x-1=0 | p. 78 |
| &xuml;+x3/(1+x2)=0 | p. 80 |
| &xuml;+x1/3=0 | p. 81 |
| &xuml;+ x3=¿(l-x2)&xdot; | p. 84 |
| &xuml;+sgn(x)=0 | p. 85 |
| Discussion | p. 86 |
| Advantages | p. 87 |
| Difficulties | p. 87 |
| Problems | p. 87 |
| References | p. 88 |
| Iteration Methods | p. 89 |
| General Methodology | p. 89 |
| Direct Iteration | p. 89 |
| Extended Iteration | p. 91 |
| Worked Examples: Direct Iteration | p. 92 |
| &xuml;+x3=0 | p. 92 |
| &xuml;+x3(1+x2)=0 | p. 97 |
| &xuml;+x-1=0 | p. 100 |
| &xuml;+sgn(x)=0 | p. 103 |
| &xuml;+x1/3=0 | p. 105 |
| &xuml;+x-1/3 | p. 108 |
| &xuml;+x+x1/3=0 | p. 110 |
| Worked Examples: Extended Iteration | p. 112 |
| &xuml;+x3=0 | p. 113 |
| &xuml;+ x-1=0 | p. 115 |
| Discussion | p. 117 |
| Advantages of Iteration Methods | p. 118 |
| Disadvantages of Iteration Methods | p. 119 |
| Problems | p. 120 |
| References | p. 121 |
| Averaging Methods | p. 123 |
| Elementary TNL Averaging Methods | p. 124 |
| Mickens-Oyedeji Procedure | p. 124 |
| Combined Linearization and Averaging Method | p. 126 |
| Worked Examples | p. 129 |
| &xuml;+ x3=-2¿&xdot; | p. 129 |
| &xuml;+x3 =-¿&xdot;3 | p. 131 |
| &xuml;+x3=¿(1-x2)&xdot; | p. 132 |
| &xuml;+x1/3=-2¿&xdot; | p. 133 |
| &xuml;+x1/3=¿(l - x2)&xdot; | p. 134 |
| &xuml;+x=-2¿(&xdot;)1/3 | p. 135 |
| General Comments | p. 137 |
| Cveticanin's Averaging Method | p. 138 |
| Exact Period | p. 139 |
| Averaging Method | p. 140 |
| Summary | p. 142 |
| Worked Examples | p. 142 |
| &xuml;+ x x ¿-1=-2¿&xdot; | p. 142 |
| &xuml;+x x ¿-1=-2¿(&xdot;)x003C;sup>3 | p. 144 |
| &xuml;+x x ¿-1=¿(1-x x003C;sup>2)&xdot; | p. 145 |
| Chronology of Averaging Methods | p. 147 |
| Comments | p. 149 |
| Problems | p. 151 |
| References | p. 152 |
| Comparative Analysis | p. 155 |
| Purpose | p. 155 |
| &xuml;+x3=0 | p. 156 |
| Harmonic Balance | p. 156 |
| Parameter Expansion | p. 158 |
| Iteration | p. 158 |
| Comments | p. 159 |
| &xuml;+x x1/3=0 | p. 160 |
| Harmonic Balance | p. 160 |
| Parameter Expansion | p. 161 |
| Iteration | p. 162 |
| Comment | p. 162 |
| &xuml;+xx003C;sup>3=-2¿&xdot; | p. 163 |
| Mickens-Oyedeji | p. 163 |
| Combined-Linearization-Averaging | p. 165 |
| Cveticanin's Method | p. 166 |
| Discussion | p. 167 |
| &xuml;+x1/3=-2¿&xdot; | p. 167 |
| Combined-Linearization-Averaging | p. 167 |
| Cveticanin's Method | p. 168 |
| Discussion | p. 170 |
| &xuml;+x3=¿(l-x 2)&xdot; | p. 170 |
| Mickens-Oyedeji | p. 170 |
| Cveticanin's Method | p. 171 |
| Discussion | p. 172 |
| &xuml;+x1/3=¿(l-x2)&xdot; | p. 175 |
| General Comments and Calculation Strategies | p. 175 |
| General Comments | p. 176 |
| Calculation Strategies | p. 177 |
| Research Problems | p. 179 |
| References | p. 181 |
| Mathematical Relations | p. 183 |
| Trigonometric Relations | p. 183 |
| Exponential Definitions of Trigonometric Functions | p. 183 |
| Functions of Sums of Angles | p. 183 |
| Powers of Trigonometric Functions | p. 183 |
| Other Trigonometric Relations | p. 184 |
| Derivatives and Integrals of Trigonometric Functions | p. 185 |
| Factors and Expansions | p. 186 |
| Quadratic Equations | p. 187 |
| Cubic Equations | p. 187 |
| Differentiation of a Definite Integral with Respect to a Parameter | p. 188 |
| Eigenvalues of a 2 x 2 Matrix | p. 188 |
| References | p. 189 |
| Gamma and Beta Functions | p. 191 |
| Gamma Function | p. 191 |
| The Beta Function | p. 191 |
| Two Useful Integrals | p. 192 |
| Fourier Series | p. 193 |
| Definition of Fourier Series | p. 193 |
| Convergence of Fourier Series | p. 194 |
| Examples | p. 194 |
| Convergence Theorem | p. 194 |
| Bounds on Fourier Coefficients | p. 195 |
| Expansion of F(a cos x, −a sin x) in a Fourier Series | p. 195 |
| Fourier Series for (cos ¿)¿ and (sin ¿)¿ | p. 196 |
| References | p. 198 |
| Basic Theorems of the Theory of Second-Order Differential Equations | p. 199 |
| Introduction | p. 199 |
| Existence and Uniqueness of the Solution | p. 200 |
| Dependence of the Solution on Initial Conditions | p. 200 |
| Dependence of the Solution on a Parameter | p. 201 |
| References | p. 202 |
| Linear Second-Order Differential Equations | p. 203 |
| Basic Existence Theorem | p. 203 |
| Homogeneous Linear Differential Equations | p. 203 |
| Linear Combination | p. 204 |
| Linear Dependent and Linear Independent Functions | p. 204 |
| Theorems on Linear Second-Order Homogeneous Differential Equations | p. 204 |
| Inhomogeneous Linear Differential Equations | p. 205 |
| Principle of Superposition | p. 206 |
| Solutions of Linear Inhomogeneous Differential Equations | p. 207 |
| Linear Second-Order Homogeneous Differential Equations with Constant Coefficients | p. 207 |
| Linear Second-Order Inhomogeneous Differential Equations with Constant Coefficients | p. 208 |
| Secular Terms | p. 210 |
| References | p. 211 |
| Lindstedt-Poincaré Perturbation Method | p. 213 |
| References | p. 216 |
| A Standard Averaging Method | p. 217 |
| References | p. 220 |
| Discrete Models of Two TNL Oscillators | p. 221 |
| NSFD Rules | p. 221 |
| Discrete Energy Function | p. 222 |
| Cube-Root Equation | p. 223 |
| Cube-Root/van der Pol Equation | p. 225 |
| References | p. 226 |
| Bibliography | p. 227 |
| Index | p. 237 |
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