Project ForgeInstrumentation & Process Control
Controller Modes
GATE 2014
Hard
In a feedforward control system, the transfer function of the process is Gp=5/(s+1) and the disturbance transfer function is Gd=1/(s²+2s+1). The transfer function of the PERFECT feedforward controller, Gf(s), is
- A−5/(s+1)³
- B−5/(s+1)
- −1/(5(s+1))
- D−5(s+1)
Explanation
For perfect feedforward compensation, Gf(s)=−Gd(s)/Gp(s)=−[1/(s+1)²]/[5/(s+1)]=−(s+1)/[5(s+1)²]=−1/[5(s+1)].
Source: GATE CH 2014 (2014)
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