Check Solve and Q21C QUESTION 30 Chick Save All Answers to save all answer. Take a = 3.0 mm, m = 11 kg, k = 12033.362 N/m, ζ = 0.025 and ω = -35.901 rad/s. Determine the whirl amplitude in mm of the disc at its critical speed and operates at n RPM. The damping in the system is equivalent to viscous damping with a damping ratio of A steel shaft E = 207 GPa diameter and length L is supported at the two ends in bearings as shown below to carry a turbine disc. Mass and eccentricity at the mid.