Ying J. Huang

TL;DR: In this paper, the authors present a method to analyze limit cycle phenomenon for underwater vehicle control systems subject to inherent nonlinearities, characterized by using their corresponding describing functions, and the stability equations decomposed from characteristic equation establish a necessary condition to sustain a limit cycle with respect to the selection of controller coefficients.

TL;DR: In this paper, a linear programming method is adopted to numerically search the entire admissible PID settings in the frequency domain, and the results are demonstrated in the coefficient plane and the coefficient space.

TL;DR: An adaptive fuzzy controller based on fuzzy neural network is proposed for uncertain nonlinear systems with the main advantages are the simple design, no requirement of system model, and release of fixed universal range of fuzzy output.