Question: When set on a rigid foundation and operating at (800 mathrm{rpm}), a 200-kg machine tool provides a harmonic force with a magnitude of (18,000 mathrm{~N})

When set on a rigid foundation and operating at $800 \mathrm{rpm}$, a 200-kg machine tool provides a harmonic force with a magnitude of $18,000 \mathrm{~N}$ to the foundation. An engineer has determined that the maximum magnitude of a harmonic force to which the foundation should be subjected to is $2600 \mathrm{~N}$.

(a) What is the maximum stiffness of an undamped isolator that provides sufficient isolation between the tool and the foundation?

(b) What is the maximum stiffness of an isolator with a damping ratio of 0.11 ?

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