摘要
Abstract
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 non-linear 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 iden-tified 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 dam-age 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Key words
cable net curtain wall/cable damage/damage detection/variational mode decomposition/Hilbert transform分类
建筑与水利
