Abstract
A simplified dynamic model of the rotor-bearing-support system is established considering the influence of pedestal flexibility. The vibration characteristics of the system with a flexible pedestal are analyzed. There are two resonance peaks during the run-up process for this kind of system. It is generally thought that the stiffness difference in the vertical and the horizontal direction is the main cause of the double resonance peak phenomenon. The results of the paper show that the flexible pedestal support also causes the double resonance peak phenomenon. The shaft relative vibration cannot reflect the influence of rotor unbalances well near the resonance zone. In this case, the bearing vibration should be preferred in the balance test. The vibration phenomenon on an actual unit is analyzed as an example.
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