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Indexed by:期刊论文

Date of Publication:2012-01-01

Journal:Applied Mechanics and Materials

Included Journals:CPCI-S、Scopus

Volume:226-228

Page Number:241-246

ISSN No.:9783037855072

Key Words:Ambient excitation; Modal parameters identification; NExT; ERA; Filtering; SNR

Abstract:A ship is a large and multifunctional marine structure operating on the sea. In practice, the environmental noise on a ship has many complicated components and they influence the vibration of the ship structure. Besides the stochastic excitations such as waves and winds, there are also propeller- and host-induced harmonic excitations. In this paper, NExT/ERA algorithm program and a ship model have been made to realize the modal parameters identification of ship structure in the presence of both white noise and harmonic excitations. Moreover, whether the signal filtering technology has a great effect on the results of modal analysis is discussed. In order to study and analyze the influence of the harmonic excitations, experiments under different signal-to-noise ratio (SNR) conditions have been carried out. This has a guiding significance to the engineering practice.