ABSTRACT
Vibrations are an inherent part of all rotating machinery. Residual mass imbalance and dynamic
interaction forces between the stationary and rotating components, which are practically impossible to
eliminate, cause these vibrations. The challenge is to identify the source of vibration and control it to
within reasonable limits. Because of economic advantages, the trend in industry has been to move
towards high speed, high power, lighter and more compact machinery. This has resulted in machines
operating above their first critical speeds, which was unheard of in the past. The new operating
parameters have required concurrent development of vibration technology without which it is not
to
an essential phenomenon, which could be used to assess the performance, durability, and reliability of
rotating machinery.
