A machine of mass 500 kg. It is supported on helical springs which deflect by 5 mm due to the weight of the machine. The machine has rotating unbalance equal to 250 kg mm. The speed of the machine is 1200 rpm. Determine the dynamic amplitude. The damping factor of the viscous damper is 0.4,
Now this machine is mounted on a larger concrete block of mass 1200 kg. The stiffness of the springs is changed such that the static deflection is still the same with the same viscous damper as in earlier case. Determine the change in the dynamic amplitude.