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论文类型： 期刊论文

发表时间： 2012-01-01

发表刊物： Applied Mechanics and Materials

收录刊物： CPCI-S、Scopus

卷号： 226-228

页面范围： 241-246

ISSN号： 9783037855072

关键字： Ambient excitation; Modal parameters identification; NExT; ERA; Filtering; SNR

摘要： 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.