基于VMD-HT的索网玻璃幕墙拉索损伤检测  

Cable damage detection of cable net curtain wall based on VMD-HT

作　　者：周奎[1,2] 刘钰洁 ZHOU Kui;LIU Yujie(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China;School of Architecture,Kashi University,Kashi 844000,China)

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]喀什大学建筑学院,新疆喀什844000

出　　处：《山东理工大学学报(自然科学版)》2025年第4期64-71,共8页Journal of Shandong University of Technology:Natural Science Edition

摘　　要：拉索是索网玻璃幕墙结构中的重要组件。为了能够及时准确监控拉索受力状态和损伤检测,本文针对非平稳非线性振动以及经验模态分解(EMD)本身存在的模态混叠等问题,提出了基于变分模态分解(VMD)和希尔伯特变换(HT)相结合的损伤检测方法,用于索网玻璃幕墙结构的拉索损伤识别。该方法利用VMD将振动信号分解成多个BIMF分量,并对其进行Hilbert变换得到相应的边际谱,最后依据模态异常指数进行拉索损伤判别。基于单层平面索网玻璃幕墙仿真模型的动力分析和单根幕墙拉索局部损伤识别发现:拉索损伤位置一定时,损伤程度越严重,边际谱幅值越低,异常指数增大;损伤程度一定时,距离损伤位置越近的测点异常指数越大;单损伤、多损伤情况下,指数在损伤位置处增大,多损伤处的变化更加明显。该方法仅需对任一位置处的响应进行检测就能评估拉索的损伤情况,具有有效性和工程实用性。Cable is an important component of cable net curtain wall structure.In order to monitor the stress state and damage detection of cable timely and accurately,this study focuses on non-stationary nonlinear vibration and mode aliasing inherent in Empirical Mode Decomposition(EMD),and proposes a damage detection method based on Variational Mode Decomposition(VMD)and Hilbert Transform(HT).In this method,the vibration signal is decomposed into several BIMF components by VMD,and the corresponding marginal spectrum is obtained by Hilbert transform.Finally,the cable damage is identified according to the modal anomaly index.Based on the dynamic analysis of the single-layer flat cable net curtain wall simulation model and the local damage identification of single curtain wall cable,it is found that:when the cable damage position is fixed,the more serious the damage,the lower the marginal spectrum amplitude,and the higher the abnormal index.When the damage degree is certain,the anomaly index of the measuring point closer to the damage location is larger.In the case of single damage and multiple damages,the index increases at the damage site,with more noticeable changes at the site of multiple damage.The method only needs to detect the response at any given location to evaluate the damage of the cable,which is effective and practical in engineering.

关 键 词：索网玻璃幕墙 拉索损伤 损伤检测 变分模态分解 希尔伯特变换 

分 类 号：TU317[建筑科学—结构工程]