Abstract
The rotor unbalance and misalignment are two major sources of vibration. Rotor unbalance is omnipresent in all rotating machinery, posing serious threat to machine life and operation. The present work is an attempt to investigate the vibration characteristics of rotating mechanical system, which has unbalanced rotor mounted on overhanging shaft. Vibration signals are acquired using accelerometer mounted on the bearing housing nearer to the rotor. The FFT analysis of the acquired data revealed the steady state response of balanced and unbalanced rotor under operating conditions. Numerical analysis of the system using ANSYS portrayed the modal frequencies, mode shapes; harmonic analysis illustrates the response of system for different mass unbalance. The results revealed that magnitude of vibration characteristics significantly increases with excitation frequency and overhang length. Campbell diagram illustrates the absence of critical speed within the selected operating range.
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