Question

A vibration isolation block is to be installed in a laboratory so that the vibration from adjacent factory operations will not disturb certain experiments. If the isolation block weighs (W) lb and the surrounding floor and foundation vibrate at (F) cycles per minute. The motion of the isolation block is limited to 10% of the floor vibration Isolation block Given: W-1380 lb f- 1730 cpm 1. Determine the natural period, natural circular frequency, and natural cyclic frequency when the 2, 3. Repeat steps 1 and 2 with zera damping and comment on your results damping ratio is 5% of the critical damping. Determine the stiffness of the isolation system when the damping ratio is 5% of the critical damping

Answer 1

17) u 20下25 od

27 2000 弘1