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Journal of Vcibration Testing and System Dynamics 4(3) (2020) 269--278 | DOI:10.5890/JVTSD.2020.09.004

Mukesh A Bulsara, Ruship Trivedi

Mechanical Engineering Department., G H Patel College of Engineering and Technology, Vallabh Vidyanagar, Gujarat, India

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Abstract

Rotating equipment like pump, blower, fan etc. are widely used in industries, where high vibration levels are observed specifically caused due to unbalance in rotating parts. A survey of literature has shown that, in spite of growing concerns about the effect of vibration levels on the power consumption, little research has been done to correlate the vibration level with power loss due to vibration. In a large refinery, with hundreds of pumps and motors, the wasted power cost, due to vibrations alone may run into thousands of dollars. The objective of this work is to propose a systematic mathematical analysis to predict the effect of unbalance on the power loss in a rotor-shaft system and validate with experiments performed on a laboratory setup at different speeds. It is observed that as rotational speed and degree of unbalance is increased, power consumption also increases. Power loss due to different degree of unbalance viz 60 gm.cm, 120 gm.cm and 180 gm.cm was measured experimentally on a test setup comprising of rotor-shaft system and mathematical validation is presented for the same. Power loss mainly takes place due to friction in bearings, which is attributed to centrifugal force produced by unbalance and displacement of rotor-shaft system. Calculated power loss is in close range of power loss determined experimentally.

Acknowledgments

Authors acknowledge help extended by G H Patel College of Engineering and Technology for providing infrastructure facilities for conducting experiment. This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

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