Traveling-Wave Modal Identification Based on Forced or Self-Excited Resonance for Rotating Discs

Abstract

Modal testing of rotating systems, such as a rotating disc interacting with a stationary restraint, is considered in this paper. A practical and effective identification method called the artificial damping method (ADM) is proposed to identify the traveling-wave modes for rotating discs based on forced or self-excited resonant responses measured using two displacement probes. The ADM procedure can handle extremely noisy systems and does not require 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 structures and other rotating systems with a relatively low level of excitation energy