A powerful electro hydraulic forklift can be used to lift pallets weighing several tons on top of 35-foot scaffolds at a construction site. The negative unity feedback system has a loop transfer function

(a) Sketch the root locus for K > 0.
(b) Find the gain K when two complex roots have a ζ of 0.707, and calculate all three roots.
(c) Find the entry point of the root locus at the real axis.
(d) Estimate the expected overshoot to a step input, and compare it with the actual overshoot determined from a computer program.

Transcribed Image Text:

K(s 1) し(s)-6(s)G(s)--2 + 1)