A controllability problem for a class of uncertain - parameters linear dynamic systems

In the paper a controllability problem for the class of time invariant linear dynamic SISO systems with uncertain parameters is discussed. The system under consideration is described by a finite dimensional state - space equation with the interval diagonal state matrix, the known control and output matrices and the two - dimensional uncertain parameters space. For the considered system a simple geometric interpretation of the system spectrum can be given. The geometric interpretation of the system spectrum is the basis to formulating the controllability conditions for the discussed system. The examples are given.