Question: A rotating machine mounted on 4 equally spaced isolation mounts has an unknown amount of unbalance causing the machine to oscillate. The machine has

A rotating machine mounted on 4 equally spaced isolation mounts has an unknown amount of unbalance causing the machine to oscillate. The machine has a total mass M1 = 300 kg and a system natural frequency of 18 Hz along the vertical axis. When the machine is in operation, it will run at a speed range of 15 to 20 Hz. (a) Design a vibration absorber (i.e. Find M2 and K2) by tuning the absorber to the machine's natural frequency of 18 Hz. The mass of M2 must be as small as possible and the effective range of the absorber should be between 15 to 20 Hz. (b) Show the exact peak locations and the effective range of your design from (a) in a Magnitude Ratio Vs Frequency Graph. M1 M2 //// K2 K1 77

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