Vibration Analysis & Solutions to Small Turbines such as Model 305

There are two main reasons for the vibration of small turbines such as Model 305: the balance of shaft system is not ensured by manufacturing process; restraints on the journal are adopted to strengthen the bearing structure without considering the feature of the less weight of the small rotor and non-contacted side-vibration while making bearing design, which results in the bigger relative vibration value. Based on the contradiction between restraint and vibrating force, the vibration causes are analyzed and several options are put forward for reference to decrease the amplitude of vibration.