Dynamics of Large Power Turbo-set with Cracked Shaft

摘要

This paper presents the research and the results of crack propagation simulation investigation. The object taken into account is a large power turbo-set rotor. The computer code system NLDW is presented. It uses a non-linear model of journal bearings, and a well known crack model. Crack depth is marked by a crack coefficient. It is shown that a crack generates a coupled form of lateral, axial and torsional vibrations in multi-support rotor. Its intensity depends on the axial and angular crack location on the shaft. The attempt at pointing a proper diagnostic indicator for crack detection in large rotating machine is made according to obtained results.