Stability Monitoring of Rotorcraft Systems: A Dynamic Data Driven Approach

Abstract

This brief paper proposes a dynamic datadriven method for stability monitoring of rotorcraft systems, where the underlying concept is built upon the principles of symbolic dynamics. The stability monitoring algorithm involves waveletpacketbased preprocessing to remove spurious disturbances and to improve the signaltonoise ratio (SNR) of the sensor time series. A quantified measure, called Instability Measure, is constructed from the processed time series data to obtain an estimate of the relative instability of the dynamic modes of interest on the rotorcraft system. The efficacy of the proposed method has been established with numerical simulations where correlations between the instability measure and the damping parameter(s) of selected dynamic mode(s) of the rotor blade are established.