期刊
STRUCTURAL CONTROL & HEALTH MONITORING
卷 28, 期 2, 页码 -出版社
JOHN WILEY & SONS LTD
DOI: 10.1002/stc.2659
关键词
Bayes factor; damage indicator; fast Bayesian FFT method; modal parameters; posterior uncertainty; vibration‐ based
资金
- National Natural Science Foundation of China [51878484]
- Japan Society for the Promotion of Science [17F17371, P17371]
- Grants-in-Aid for Scientific Research [17F17371] Funding Source: KAKEN
This paper presents a novel Bayesian fast Fourier transform (FFT) method for damage detection, utilizing ambient vibration data. The method efficiently calculates a damage indicator in the frequency domain and has been validated using synthetic and real bridge structures.
Damage detection is one important target in structural health monitoring (SHM). Vibration-based damage detection has attracted more attention in the past decades by tracking the modal parameter changes of objective structures. This paper presents the work on developing a novel Bayesian fast Fourier transform (FFT) method for damage detection using the Bayes factor based on ambient vibration data. Based on the properties of FFT data, the likelihood function and prior probability density function (PDF) can be constructed theoretically based on a Gaussian distribution. The most probable value (MPV) of modal parameters and the associated covariance matrix determined from the ambient vibration data can be integrated into the model developed according to the Bayes factor. A novel damage indicator in the frequency domain is proposed, which can be calculated efficiently using the FFT data and the identified modal parameters. The method is illustrated using synthetic data where a simply supported bridge with 10 elements is simulated. It is found that the damage indicator can identify the damage element in both damage location and extent when moving the sensors installed on the bridge. The proposed method is also applied in a steel truss bridge and an American Society of Civil Engineers (ASCE) benchmark structure. This method can make full use of the FFT data, modal parameters' information, and their posterior uncertainties, providing a new way for future damage detection.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据