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Indexed by:期刊论文

Date of Publication:2018-05-01

Journal:JOURNAL OF AEROSPACE ENGINEERING

Included Journals:SCIE、EI

Volume:31

Issue:3

ISSN No.:0893-1321

Key Words:Frequency identification; Higher-order spectrum; Power spectrum; Practical bridge

Abstract:Identifying the frequencies of practical bridges can help in understanding the bridge dynamic property. However, the vibration amplitude excited by wind load and traffic load is too small, resulting in a small signal noise ratio, which affects the performance of frequency identification. This paper proposes frequency identification procedures for practical bridges to reduce the influence of noise through higher-order spectrum. First, a higher-order spectrum is introduced. Then, the frequency identification procedures are presented for practical bridges. Finally, the proposed procedures are applied to a practical bridge. A higher-order spectrum can eliminate the influence of Gaussian white noise (GWN) or reduce nonstationary random noise during frequency identification. The advantage of using the higher-order spectrum to identify frequencies is verified by simple artificial signals combined with sinusoidal signals with different frequencies and GWN. The results show that the second-order spectrum obtained by the higher-order spectrum has better frequency identification performance than the tradition spectrum and that the frequencies of the practical bridge can be identified successfully. (c) 2018 American Society of Civil Engineers.