This book puts forward the concept of a virtual equivalent system (VES) based on theoretical analysis and simulation results.
The new concept will facilitate the development of a unified framework for analyzing the stability and convergence of self-tuning
control (STC) systems, and potentially, of all adaptive control systems. The book then shows that a time-varying STC system
can be converted into a time-invariant system using a certain nonlinear compensation signal, which reduces the complexity
and difficulty of stability and convergence analysis. In closing, the VES concept and methodology are used to assess the stability
of multiple model adaptive control (MMAC) systems and T-S model-based fuzzy control systems.