Study of Modal Parameter Identification from Ambient Vibration on a Deep Radial Gate

Yuan Qi Cai; Ke Zhang

doi:10.4028/www.scientific.net/AMM.105-107.511

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 105-107Study of Modal Parameter Identification from...

Study of Modal Parameter Identification from Ambient Vibration on a Deep Radial Gate

Abstract:

In the engineering background of the prototype test of a deep radial gate on three gorges dam, two methods are provided for the modal parameter identification of the radial gate, one is applying operation modal analysis (OMA) to a gate which is under flood discharge, the other one is applying experiment modal analysis (EMA) to a inactive gate with some other gates under flood discharge. This paper is based on the feasibility study on the former method. We use the natural excitation technology (NExT) combined with the eigensystem realization algorithm (ERA) to determine the dynamic characteristics of a gate. Displacement data at 7 locations were processed using NExT-ERA to extract the natural frequency and associated damping ratio. The results show the effectiveness of this modal identification methodology and the possibility of implementing it on other hydraulic structure.

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Periodical:

Applied Mechanics and Materials (Volumes 105-107)

Pages:

511-517

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.105-107.511

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Online since:

September 2011

Authors:

Yuan Qi Cai, Ke Zhang

Keywords:

Ambient Vibration, Eigensystem Realization Algorithm, Modal Parameter Identification, Radial Gate, Three Gorges Project (TGP)

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