考虑非均匀采样的公路桥梁贝叶斯指导下的运行模式识别

IF 2.1 4区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Zhi-Wen Wang, Jun-Hong Liu, You-Liang Ding, Xiao-Mei Yang, Xu Zheng, Ting-Hua Yi
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引用次数: 0

摘要

在对桥梁进行结构健康监测的过程中,我们发现采集到的振动数据有时会随机丢失或采样不均匀。这导致测量数据的频谱函数信噪比较低,难以识别弱模态。为解决这一问题,本研究提出了一种运行模态识别框架。它利用快速贝叶斯快速傅立叶变换(FFT)方法,在考虑非均匀监测数据的情况下估计公路桥梁的模态参数。快速贝叶斯 FFT 方法的初始频率参数是利用所提出的自回归(AR)功率谱密度(PSD)引导的峰值拾取方法自动确定的。这克服了捕捉与弱贡献模式相关的初始频率的难题。此外,每个模态的带宽参数都是利用 PSD 矩阵左侧第一个奇异向量的模态保证准则 (MAC) 确定的。此外,在分析非均匀振动数据时,建议使用非均匀 FFT(NUFFT)计算 PSD 函数,以提高识别精度。利用数值模型和实际桥梁的加速度数据对所提出的方法进行了验证。结果表明,模态参数的识别不确定性随着非均匀度的增加而增加。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bayesian-guided operational modal identification of a highway bridge considering non-uniform sampling
During the structural health monitoring of bridges, it has been observed that the vibration data collected can sometimes be randomly lost or sampled non-uniformly. This leads to a low signal-to-noise ratio in the spectral functions of the measured data, making it difficult to identify weak modes. To address this issue, a framework for operational modal identification is proposed in this study. It utilizes the fast Bayesian fast Fourier transform (FFT) method to estimate the modal parameters of highway bridges considering the non-uniform monitoring data. The initial frequency parameters for the fast Bayesian FFT approach are automatically determined using the proposed autoregressive (AR) power spectral density (PSD)-guided peak picking method. This overcomes the challenge of capturing initial frequencies related to weakly contributed modes. Additionally, the bandwidth parameter for each mode is determined using the modal assurance criterion (MAC) of the first left singular vectors of PSD matrices. Furthermore, when analyzing non-uniform vibration data, it is recommended to use the non-uniform FFT (NUFFT) for calculating PSD functions in order to improve identification accuracy. The proposed method is validated using acceleration data from both a numerical model and a real-world bridge. The results demonstrate that the identification uncertainty of modal parameters increases with higher non-uniform levels.
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来源期刊
Advances in Structural Engineering
Advances in Structural Engineering 工程技术-工程:土木
CiteScore
5.00
自引率
11.50%
发文量
230
审稿时长
2.3 months
期刊介绍: Advances in Structural Engineering was established in 1997 and has become one of the major peer-reviewed journals in the field of structural engineering. To better fulfil the mission of the journal, we have recently decided to launch two new features for the journal: (a) invited review papers providing an in-depth exposition of a topic of significant current interest; (b) short papers reporting truly new technologies in structural engineering.
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