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dynamical system satisfies the condition x (k 1 , x (k 0 ) , u) = x 1 controllability in a given time interval [t 0 , t 1 ] if for any initial state x (t 0 ) ∈ R n and any vector x 1 ∈ R n there exists an admissible control u ∈ L 2 [ t 0 , t 1 ] , R m such that the corresponding trajectory of the x(t, x(t 0 ), u) satisfies the following condition: x (t 1 , x (t 0 ) , u) = x 1 controllability of nonstationary systems a characteristic of some dynamical systems. A linear dynamical nonstationary system is [t 0 , t 1 ] if and only if the n × n dimensional controllabil- ity matrix W (t 0 , t 1 ) = Z t 1 t 0 F (t 1 , t) B(t) × B T (t)F T (t 1 , t) dt is nonsingular. See also finite- dimensional system controllability of stationary systems a characteristic of some dynamical systems. A rank h B|AB|A 2 B| . . . |A k B| . . . |A n−1 B i = n See also stationary continuous-time finite-dimensional system controlled process part of the control scene that can be influenced by the manipu- controlled process model model, usu- ally stated in form of a set of differential or controlled rectifier a rectifier that uses switching elements that have forward volt- controlled source a voltage or current source whose intensity is controlled by a cir- controlled variable (1) the quantity, usu- ally the output of a plant or process, that is be- (2) variable associated with the behavior of the controlled process and such that one c 2000 by CRC Press LLC |