Complex Time Series Modeling and Analysis for Rotor Dynamics Identification

[+] Author and Article Information
Chong-Won Lee, Kwang-Joon Kim

Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Taejon 305-701 Korea

Jong-Po Park

R & D Center, Korea Heavy Industries & Construction Co., Ltd., Changwon, Korea

J. Vib. Acoust 119(4), 512-522 (Oct 01, 1997) (11 pages) doi:10.1115/1.2889753 History: Received October 01, 1994; Revised October 01, 1995; Online February 26, 2008


A new time series method, directional ARMAX (dARMAX) model-based approach, is proposed for rotor dynamics identification. The dARMAX processes complex-valued signals, utilizing the complex modal testing theory which enables the separation of the backward and forward modes in the two-sided frequency domain and makes effective modal parameter identification possible, to account for the dynamic characteristics inherent in rotating machinery. The dARMAX is superior in nature to the conventional ARMAX particularly in the estimation of the modal parameters for isotropic and weakly anisotropic rotors. Numerical simulations are performed to demonstrate effectiveness of the dARMAX.

Copyright © 1997 by The American Society of Mechanical Engineers
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