VARIATIONS OF A RESONANCE CURVE DUE TO THE ANGULAR POSITION OF AN UNBALANCE AT THE MAJOR CRITICAL SPEED
BIBIRE LUMINIŢA, MARIN M., MARIN C., COBREA CODRIN
UNIVERSITY OF BACĂU, S.C. TOFAN GRUP S.A., M.E.C.
Abstract
In order to find some way to detect a transverse crack due to fatigue in a rotating machine, we have investigated experimentally and theoretically the change in the resonance curve caused by the occurrence of a crack. It is shown that this phenomenon is explained theoretically by combining the characteristics of the unsymmetrical shaft and that of the symmetrical shaft or by considering rotating nonlinear spring characteristics.