期刊论文

Qu, Chun-Xu

Yi, TH (reprint author), Dalian Univ Technol, Sch Civil Engn, Dalian 116023, Peoples R China.

Yi, Ting-Hua,Zhou, Yu-Zheng,Li, Hong-Nan,Zhang, Yu-Feng

2018-05-01

JOURNAL OF AEROSPACE ENGINEERING

SCIE、EI

J

31

3

0893-1321

Frequency identification; Higher-order spectrum; Power spectrum; Practical bridge

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.