14th IFAC Symposium on System Identification, SYSID 2006

SYSID-2006 Paper Abstract

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Paper FrB4.2

Hanson, David (Univ. of New South Wales), Randall, Robert B (The Univ. of New South Wales), Antoni, Jérôme (Univ. of Tech. of Compiegne), Ford, Robin A J (The Univ. of New South Wales), Thompson, David J (Univ. of Southampton), Waters, Tim P (Univ. of Southampton)

Operational Modal Analysis Using Cyclostationarity and the Complex Cepstrum

Scheduled for presentation during the Regular Session "Modal Analysis and Estimation of Mechanical Properties" (FrB4), Friday, March 31, 2006, 15:50−16:10, Cummings Room

14th IFAC Symposium on System Identification, March 29 - 31, 2006, Newcastle, Australia

This information is tentative and subject to change. Compiled on July 16, 2018

Keywords Blind Estimation, Vibration and Model Analysis, Frequency Domain Identification

Abstract

This paper presents a new technique for blind identification of MIMO systems excited by cyclostationary inputs with unique cyclic frequencies. The cyclic spectral density is determined, effectively reducing the system from a MIMO to a SIMO scenario, and curve fitted in the cepstrum domain, which allows for the separation of the input and path effects. This technique is demonstrated using a steel beam excited by two cyclostationary inputs. Two separate modal analyses were conducted using each of the inputs separately. In this way, the other input acts as extraneous noise of equal magnitude, thereby demonstrating the relative insensitivity of the technique to the presence of noise.