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Unformatted text preview: is transmitted to the ground when the fan is running at 10,000 rpm. 3. (p. 3.28) An electric motor of mass 68 kg is mounted on an isolator block of mass 1200 kg and the natural frequency of the total assembly is 160 cpm with a damping factor of ζ =0.1 (see below). If there is an unbalance in the motor that results in a harmonic force of F=100 sin 31.4t, determine the amplitude of vibration of the block and the force transmitted to the floor. 4. (p. 3.29) A sensitive instrument with mass 113 kg is to be installed at a location where the acceleration is 15.24 cm/s2 at a frequency of 20 Hz. It is proposed to mount the instrument on a rubber pad with the following properties: k=2802 N/cm and ζ =0.10. What acceleration is transmitted to the instrument?...
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- Fall '08