Modal Parameter Identification of Jacket-Type Platforms Using Vibration Testing Data

Yu Jing Chen; Min Zhang; Yuan Dong Meng; Qiang Zhao; Jie Wen Nie

doi:10.4028/www.scientific.net/AMM.170-173.2243

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 170-173Modal Parameter Identification of Jacket-Type...

Modal Parameter Identification of Jacket-Type Platforms Using Vibration Testing Data

Abstract:

How to estimate the modal parameters (including natural frequencies and mode shapes) of an offshore platform accurately is crucial for the health monitoring problems. The purpose of this paper is to identify the modal parameters of a physical jacket-type platform model from measured modal testing data using Prony’s method. In the modal testing, the identified false modes are unavoidable and bring much difficulty to determine the accurate modal parameters. To solve these problems, in this paper, the Modal Phase Collinearity (MPC) and Modal Assurance Criterion (MAC) are applied to distinguish the true and false modal. The measured data are extracted from a physical model of a realistic offshore platform. And the results demonstrate that the modal parameters of the first two modes of each direction can be accurately estimated by using the proposed method.

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Applied Mechanics and Materials (Volumes 170-173)

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2243-2247

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.170-173.2243

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Online since:

May 2012

Authors:

Yu Jing Chen, Min Zhang, Yuan Dong Meng, Qiang Zhao, Jie Wen Nie

Keywords:

Jacket-Type Platform, Modal Parameter Identification, Prony’s Method, Vibration Testing

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