Affine Dependence of Network Observability/Controllability on Its Subsystem Parameters and Connections

This article investigates observability/controllability of a networked dynamic system (NDS) in which matrices its subsystems are expressed through linear fractional transformations (LFTs). Some relations have been obtained between this NDS and descriptor systems about their observability/controllability. A necessary sufficient condition is established with the associated depending affinely on subsystem parameters/connections. An attractive property that all required calculations performed independently each individual subsystem. Except well posedness, not any other conditions asked for sharp contrast to recent results structural observability/controllability, proven be NP-hard. characteristics helpful constructing an observable/controllable NDS. It has made clear input matrix full column rank observable while output row controllable These extended form subsystems. As byproduct, normal previous works network completely removed. On hand, satisfaction shown appreciative building observable/controllability