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Operational modal analysis of a ship model in the presence of harmonic excitation

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Abstract

A ship is operated under an extremely complex environment, and waves and winds are assumed to be the stochastic excitations. Moreover, the propeller, host and mechanical equipment can also induce the harmonic responses. In order to reduce structural vibration, it is important to obtain the modal parameters information of a ship. However, the traditional modal parameter identification methods are not suitable since the excitation information is difficult to obtain. Natural excitation technique-eigensystem realization algorithm (NExT-ERA) is an operational modal identification method which abstracts modal parameters only from the response signals, and it is based on the assumption that the input to the structure is pure white noise. Hence, it is necessary to study the influence of harmonic excitations while applying the NExT-ERA method to a ship structure. The results of this research paper indicate the practical experiences under ambient excitation, ship model experiments were successfully done in the modal parameters identification only when the harmonic frequencies were not too close to the modal frequencies.

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Authors and Affiliations

  1. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, China

    Junchen Xu, Ming Hong & Xiaobing Liu

Authors
  1. Junchen Xu
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  2. Ming Hong
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  3. Xiaobing Liu
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Corresponding author

Correspondence to Ming Hong.

Additional information

Foundation item: Supported by the National Natural Science Foundation of China (51079027).

Junchen Xu is a postgraduate student of ship structural design and manufacture at Dalian University of Technology. His research interests are the operational modal analysis and the dynamic optimization of ship structure.

Ming Hong is a professor of ship vibration at the School of Naval Architecture and Ocean Engineering, Dalian University of Technology. His research interests include ship vibration analysis, control, and experimentation as well as acoustic transmission in multi-media. He is a senior member of China Shipbuilding Institute and a member of the Ship Mechanics Committee.

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Xu, J., Hong, M. & Liu, X. Operational modal analysis of a ship model in the presence of harmonic excitation. J. Marine. Sci. Appl. 12, 38–44 (2013). https://doi.org/10.1007/s11804-013-1167-8

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  • DOI: https://doi.org/10.1007/s11804-013-1167-8

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