Question #$2$

$[5$ Points$]$

The diagram shows frequency spectrum of a pump driven by an electric motor rotating at $1200$ rpm $.$ The data are collected at the electric motor bearing $($S$1)$ on the side near to the coupling directly connected to a reduction gearing that drives the pump propeller at $400$ rpm $.$ If the gears have $20$ and $60$ teeth and the deep groove bearings of the motor have $9$ balls of $8$ mm diameter each, bearing inner diameter $25$ mm $,$ outer diameter $52$ mm $,$ pitch diameter of $39$ mm and width of $15$ mm ;

use the fundamentals of vibration analysis of rotary equipment to complete the following:

Frequency of $1$ X is equal to

Hz$.$

$2.$ Any frequencies in zone $B$ are called $q,$

$3.$ High amplitudes in region C may be due to

or

$4.$ If the recorded vibration at $2$ X is in both axial and radial directions this is then caused by$.$

$5.$ The high peaks at zone D may indicate $\_$

$6.$ The crossing at region E indicates defective

$7.$ To check for motor rotor faults, zoomed frequency spectrum near frequency should be checked for

$8.$ To make sure of gear meshing faults, zoomed frequency spectrum nea$$ frequency should be checked for

$9.$ When a transducer S $2$ is placed on the pump shaft, it is normal to detect amplitude peaks at and Hz representing

$q,$ and

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