Time-varying linear system decomposed control

This paper is concerned with the block control decomposition method for multivariable time varying linear plants in which the control law synthesis problem is divided into a number of sub-problems of lower dimension which can be solved independently. First, the block modal control problem is solved. Then to render the approach practicable for a wider range of plants, an observer is also designed using a Lyapunov technique. The effectiveness of the method is demonstrated by its application to a DC motor based electric drive with controlled flux.