Discover the Transfer Functions of Block Diagrams for Optimal Performance

[kwbake01]

How do I get the transfer functions of the following block diagrams

a) [K(s+a)/(s+1)]--->[1/s(s+2)(s+3)]
...BLOCK 1....BLOCK 2

b) [4+(40/s)]--->[s^2/(s+100)(4s^2+5s+4)]
...BLOCK 1.....BLOCK 2

c) [a+(B/s)]---->[1/(s+1)]
...BLOCK 1...BLOCK 2

 

[lewando]

Cascaded transfer functions can be combined through multiplication.