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Vibration Analysis Based Machine Unbalance Fault Detection and Correction
Siva Shankar Rudraraju
INDIAN SCHOOL OF MINES DHANBAD, INDIA
I. Introduction 3
II. Vibration Signal Analysis: In a nutshell 4
III. Machine Faults 5
IV. Unbalance: The Problem 6
V. Balancing 8
VI. Experimental Setup 10
VII. Unbalance Detection 12
VIII. Balancing / Removal of unbalance 14
IX. Conclusions & Suggestions 18
X. References
Introduction
Why do machines vibrate…….?
Every machine component has an inherent capacity to store energy. This
energy is stored in certain quantum states which are called modes.
When the machine component is excited by an external force, the machine
takes up the energy and starts vibrating with various frequencies and
corresponding amplitudes. The resultant vibrational state is a superposition of
all the individual modes of vibration.
Conclusions
Vibration signature analysis backed by good signal analysers (Like Larson Davis
2900B, Oros 25) results in excellent machine fault detection and correction.
Various balancing experiments conducted with different unbalance
configurations using vibration analysis resulted in excellent balancing. This lead
to drastic reduction in the overall vibration levels.
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