Draw the zeta=0.707 line. then the intersection point btwn the RL and zeta line in the location of the cl complex pole. Derive the characteristic eq, then replace s by the cl pole to get K. K should be real and +. or use K=-(denominator)/(numerator) of G(s).
wn can be found from the complex cl pole using the pythagorian.

Design a quick return four bar mechanism that will have time ratio of tr 1: 1.25 . the output link should scan 60° angle for a full crank rotation . the length of output link is 5.0 em 1)-find the length of the other links and draw the mechanism .(write down your steps) 2)-does the mechanism satisfy the grashof's condition. 3)-find the max and min transmission angles over the range of motion using graphical technique