期刊
APPLIED MATHEMATICAL MODELLING
卷 91, 期 -, 页码 297-310出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.apm.2020.09.048
关键词
High arch dam; Hilbert-Huang transform; Empirical mode decomposition; Modal confusion; Masking signal
资金
- National Natural Science Foundation of China [51669013, 51779115, 51869011, 51879126]
- Jiangxi Province Funds for Distinguished Young Scientists [20192ACB21022, 2018ACB21018]
A method combining empirical mode decomposition and masking signal processing is proposed to address difficulties in extracting vibration signals of a high arch dam flow discharge structure under water flow excitation. By mixing different frequency parts of the signal and effectively inhibiting modal confusion, the method accurately identifies the modal parameters of the structure.
The vibration signal of a high arch dam flow discharge structure under the excitation of water flow is difficult to extract because the vibration signals are weak, low-frequency, and easily submerged by noise. To address the problem of modal confusion during the modal identification of dam structures, a combined decomposition method based on the combination of complete ensemble empirical mode decomposition with adaptive noise and a masking signal processing method is proposed based on the analysis of modal confusion mechanism. Based on the measured vibration response signals of the dam body's measuring points, the bandwidth signals that have modal confusion are mixed with the high frequency part of the original signal by adding a masking signal. After decomposition distinguishes different frequency parts of the signal, better inhibition of modal confusion is obtained. The improved Hilbert-Huang transform and random decrement technique methods are used to identify the modal parameters of the high arch dam under the excitation of flow discharge. The analysis of engineering example shows that this method can effectively inhibit modal confusion, avoid loss of modal information, and accurately identify the modal parameters of the structure. It can be applied to the modal identification process of engineering structures in other related fields. (C) 2020 Elsevier Inc. All rights reserved.
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