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Indexed by:会议论文

Date of Publication:2009-07-05

Included Journals:EI、Scopus

Volume:2

Page Number:1224-1231

Abstract:Operational modal analysis is a procedure which allows extracting modal parameters from a structure in operational condition only based on response data under ambient excitation. It is based on the assumption that input to the structure is stationary white noise. In practice however, the excitations on a ship during its voyage can not be assimilated to white noise input, harmonic forces produced by the main engine and propeller are also present, so the excitations of an operational ship can be assumed to be white noise including harmonic excitations. This paper discusses the application feasibility of operational modal analysis on ship structure. And the auto-cross spectrum density method is proposed and verified by a simply supported beam experiment. Then the vibration data of a mast during a ship trial is analyzed and discussed.