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SolSec 5.3 - 5 21 Problems and Solutions Section 5.3(5.27...

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5- 21 Problems and Solutions Section 5.3 (5.27 through 5.36) 5.27 A motor is mounted on a platform that is observed to vibrate excessively at an operating speed of 6000 rpm producing a 250-N force. Design a vibration absorber (undamped) to add to the platform. Note that in this case the absorber mass will only be allowed to move 2 mm because of geometric and size constraints. Solution: The amplitude of the absorber mass can be found from Eq. (5.22) and used to solve for k a : N/m 000 , 125 250 m 002 . 0 0 = = = = a a a a k k k F X From Eq. (5.21), ω ω π 2 2 2 125 000 6000 2 60 0 317 = = = = k m m k a a a a , . kg
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