STRUCTURAL ASYMPTOTICAL STABILITY OF LINEAR MULTIVARIABLE SYSTEMS.

Some ideas of structural asymptotical stability and unchanged order are presented. The proper definition of systems nondegeneracy is given. The sufficient and necessary conditions for the nondegeneracy and structural asymptotical stability of complex systems (parallel systems, series systems and closed systems) are proved. By using the above conclusions the nondegeneracy condition of systems without steady errors is analyzed successfully. It is shown that the nondegeneracy condition is not only one of the sufficient conditions but also a necessary condition of realizing systems without steady errors.