Question: ? A milling machine (shown below) weighing 1000 kg is rigidly mounted on a concrete floor using four steel supports (one at each corner of

A milling machine (shown below) weighing 1000 kg is rigidly mounted on a concrete floor using four steel supports (one at each corner of

A milling machine (shown below) weighing 1000 kg is rigidly mounted on a concrete floor using four steel supports (one at each corner of the machine base). Each support has a stiffness, k = 2000 kN/m. Assume a low damping ratio, = 0.01. (a) Determine the natural frequency for this system. (7.5 PTS) (b) Determine the force transmissibility ratio for this system when the machine is running at 800 RPM. (10 PTS) (c) If the total force measured at the machine base is measured to have an amplitude of 2500 N, determine the amplitude of the force the milling machine is generating. (7.5 PTS) Sharp Cutting head 1 0.9 0.8 0.7 0.6 20.5 0.4 0.3 Transmissibility 0.2 0.1 0 0.0 1.0 2.0 3.0 Frequency Ratio @p/@n 4.0 -=0.0001 -=0.05 -=0.1 --0.15 -=0.25 -=0.375 -=0.5 -=1.0 5.0

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