Traveling-wave modal identification based on forced or self-excited resonance for rotating discs

Modal testing of rotating systems, such as a rotating disc interacting with a stationary restraint, is considered in this paper. A practical and effec tive identification method called the artificial damping method (ADM) is pr oposed to identify the traveling-wave modes for rotating discs based on for ced or self-excited resonant responses measured using two displacement prob es. The ADM procedure can handle extremely noisy systems and does not requi re excitation information. The method is suitable for the detection of self -excited modes that may occur during operation. Additionally this procedure can be effectively used to identify modal parameters for large-scale struc tures and other rotating systems with a relatively low level of excitation energy.