NDLI: Methods of system identification for monitoring slowly time-varying structural systems

Content Provider	IEEE Xplore Digital Library
Author	Johnson, E.A. Voulgaris, P.G. Bergman, L.A.
Copyright Year	1997
Description	Author affiliation: Dept. of Aeronaut. & Astronaut. Eng., Illinois Univ., Urbana, IL, USA (Johnson, E.A.)
Abstract	It is often necessary to monitor the response of structural systems for reasons such as the prediction and avoidance of unstable behavior like flutter, monitoring structural parameters (e.g. natural frequency and damping, response of critical structural modes), and detection of structural damage or verification of structural integrity. Several different system identification methods are studied for the efficacy of their implementation for online monitoring of slowly time-varying structural systems. A few simple examples of such systems facilitate the evaluation of the performance, accuracy and ease of use of the various methods. Special attention is focused on exploring H/sub /spl infin//-based identification methods and on a two-stage algorithm using a recursive least-squares identification. It is observed that H/sub /spl infin//-based methods, while having advantages for many problems, especially in computing plant uncertainty bounds that are suitable for H/sub /spl infin// control design, are not particularly well-suited for online structural monitoring. Recursive least-squares methods, however, are sufficiently computationally simple to provide real-time updates of structural parameters and, in conjunction with a Kalman filter, modal response with relatively good accuracy for systems with slowly varying characteristics.
Starting Page	569
Ending Page	573
File Size	543661
Page Count	5
File Format	PDF
ISBN	0818682183
DOI	10.1109/IIS.1997.645422
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-12-08
Publisher Place	Bahamas
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	System identification Time varying systems Aircraft Structural engineering Real time systems Aerodynamics Testing Sensor arrays Condition monitoring Frequency
Content Type	Text
Resource Type	Article

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