Abstract
Rapid technological development in many industrial branches requires increasing of the rotating machinery speed and performances. This tendency might be considered the main cause that induced numerous vibration troubles in the field of rotating machinery. Recently, in order to increase the machines performances the radial clearance between the rotating shaft and casing became smaller and smaller. As a result, severe vibration accidentally occurred in the rotating machinery systems. From the standpoint of the unbalance response type, the problem of rubbing might occur in the low-speed, near the critical speed, or in the high-speed ranges of the rotor. Among these speed intervals, especially in the case of high-speeds, various kinds of vibration occurred, such as "synchronous vibration", "sub-harmonic vibration", "chaotic vibration", etc. This study presents a theoretical and experimental study of the rotor vibration due to the rubbing against casing, for high-speeds regime and different configurations of the casing.
