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Date of Publication:2011-01-01

Journal:船舶力学

Issue:3

Page Number:313-324

ISSN No.:1007-7294

Abstract:Operational modal analysis is a procedure which allows extracting modal parameters from a structure only based on response data under ambient excitation.It is based on the assumption that input to the structure is stationary white noise.In this paper,the application feasibility of operational modal analysis on ship structures is discussed.And band stop filter is proposed to filter the obvious harmonic energy to improve the identification precision of real modes.Then the auto-cross spectrum density method is discussed and verified by a simply supported beam experiment with white noise and harmonic excitations.This method is testified to be effective to identify the natural frequencies and operating deflection shapes.So it isfeasible and significant to identify modal parameters of ship structures under ambient excitations.

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