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Tuesday, July 9 • 10:50 - 11:10
ONLINE ALGEBRAIC ESTIMATION OF MODAL PARAMETERS AND EXCITATION FREQUENCY OF A VIBRATING SYSTEM

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This paper introduces an algebraic approach for online estimation in time domain of modal parameters and excitation harmonic force frequency for an uncertain vibrating mechanical system. Closed-form algebraic formulas to compute unknown damping ratio and natural frequency of a vibrating system into a small window of time are proposed. Unknown excitation frequency is simultaneously estimated by the proposed parametric estimation method as well. Fast algebraic estimation is performed by using measurements of position signals only. Algebraic estimators can be continuously restarted and updated for monitoring possible changes of structural parameters and excitation frequency. The algebraic estimation approach can be extended to identify structural parameters for failure detection purposes in flexible mechanical structures in real time. Online health monitoring of mechanical structures represents also a potential application of algebraic parameter identification methods in time domain. Some computer simulation results are described to show the effectiveness of the parameter estimation method on a vibrating mechanical system.

Moderators
SL

Sébastien Laurier Chapleau

Senior Technical Specialist - Innovation - Dynamics & Acoustics, Bell (Flight)

Authors

Tuesday July 9, 2019 10:50 - 11:10 EDT
Westmount 3
  T10 Sig. Proc. & nonlin. mthds., RS03 Machinery health monit