Investigation on balancing of a high-speed rotor

Abstract

Balancing is an effective way of reducing vibration and reaction forces in rotor’s bearings. Two main approaches of modal balancing and influence coefficients method have been used for this aim. However, by considering specific balancing procedure for each rotor and addressing and detecting many of the unbalance sources in manufacturing and assembly this reduction can be ensured in earlier stage. This thesis provides the theories and backgrounds, in addition of a step by step guidelines for rotor balancing. Then applies those theories and guidelines in order to balance a sample flexible rotor, supported by magnetic bearings, in high-speed. Possible unbalance sources are considered in the text. A simulation analysis featuring the effect of variation of the arrangement in a part of the system components is provided. The results of the study indicate that the performance of influence coefficient method was great for the magnetic bearing supported rotor. The other imperative result approves the need for accurate assembly procedure of the components to reduce initial unbalance of the rotor.