Nonlinear systems Mathematical models 23 Control theory 18 Nonlinear control theory 14 System identification 14 Chaotic behavior in systems 13 Dynamics 11 Neural networks (Computer science) 9 Nonlinear theories 9 Engineering design 7 Automatic control 6 System analysis 6 System theory 5 Automatic tracking 4 Discrete-time systems 4 Energy transfer 4 Engineering mathematics 4 Fault location (Engineering) 4 Force and energy 4 Mechanics 4 Signal processing 4 Synchronization 4 Time delay systems 4 Computational complexity 3 Computer simulation 3 Congresses 3 Digital communications 3 Electric distortion 3 Physics 3 Physiology 3