This preview shows page 1. Sign up to view the full content.
Unformatted text preview: ock Diagrams & Signal-Flow Graphs ECE382 7 / 31 This is the advantage of a feedback control system. C1 (s) G1 (s)G2 (s) 1 R(s) D(s)=0 G1 (s)G2 (s)H(s) H(s)
C. S. George Lee (Purdue Univ.) Block Diagrams & Signal-Flow Graphs Hence, it is independent of G1 (s)G2 (s). If H(s) 1, then C1 (s) = R(s); we have output tracks the input. ECE382 8 / 31 Block Diagram Reduction and Algebra Block Diagram Reduction Example C. S. George Lee (Purdue Univ.) Block Diagrams & Signal-Flow Graphs ECE382 9 / 31 C. S. George Lee (Purdue Univ.) Block Diagrams & Signal-Flow Graphs ECE382 10 / 31 Signal Flow Graphs
The block diagram is useful for graphical representation of a control system. However, for a very complicated system, the block diagram reduction method to find the overall transfer function becomes too time consuming. We shall use an alternative method involving signal flow signal flow graph. A signal flow graph is a pictorial representation of a set of simultaneous linear algebraic equations describing a system. A signal flow graph is a Laplace-transform domain manipulation. A signal flow graph consists of a network in which nodes are connected by directed branches. Each node represents a system variable or signal, and each branch connected between 2 nodes acts as a signal multiplier.
C. S. George Lee (Purdue Univ.) Block...
View Full Document
This note was uploaded on 02/05/2012 for the course ECE 382 taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.
- Fall '08