| dc.description.abstract | Cavitation is the phenomenon of phase change from liquid to vapor in the flowing
fluid. The changi can be toutid by the decrease of pressure and the intease of -temperahre. Tie indication of cattitation in pump is the incidents of noise, high
vibiation and the vapor bubbles. The ffict of cavitation is decrease in performance
and failure of pump components. In this research, the capacity to observe the Jlow
pattirn was iirted, and,-in order to lmow the incidents of parameter cavitation, the
-pump
vibration such as the acceleration derivative (ierk) in the pump housing was
measured- The measurement was done by using the jerk sensor which was assembled
by using module accelerometer- This module accelerometer is functione_d--to change
the acileration signal to electric tension and is dffirentiated as a dffirenttator.
This module detects the movement in three directions: axial, vertical and horizontal
simultaneously and an air released is provided. In order to display the result of
measurentent, Digital Storage Oscilloscope (DSO Quad) is used. This research
showed that the iibration signal in the pump is increase in low capacity which was
indicatedwith the increase of the amplitude and occurred in the turbulence condition Based on the NPSH measurement, Reynolds number and the characteristics of
acceleration derivatives vibration (jerk) indicated the highest number on the
turbulence position which indicated the incidents of cavitation to the mial if more
than 4880
-rrr/tt,
to the vertical if more than 1585 m/s3 and to the horizontal if more
than 7738 nt/s3. | en_US |
