{"title":"Investigating bridge vibrational modes under operational conditions using time-frequency analysis","authors":"Yazhou Qin","doi":"10.1080/15732479.2023.2275684","DOIUrl":null,"url":null,"abstract":"AbstractThis study aims to accurately and effectively investigate the instantaneous frequency (IF) of the monitored acceleration of the bridge, as well as the individual components of the monitored signal, using advanced time-frequency techniques. To achieve this, first, synthetic signals resembling the monitored acceleration are constructed and processed using four time-frequency techniques. The accuracy of IF tracking, signal reconstruction, and representation resolution are obtained and compared between these different time-frequency techniques. Subsequently, the monitored vertical and torsional accelerations from the Humber Bridge are analysed using the Fourier synchrosqueezed transform and the improved multisynchrosqueezing transform. This allows for the reconstruction of individual acceleration components along with the corresponding variation of the natural frequency. The magnitude of each component of the monitored acceleration is then obtained. The relative importance of modes in the monitored acceleration is evaluated based on the acceleration root mean square. This study presents a novel approach that involves reconstructing the monitored acceleration and assessing the magnitude of individual components of the monitored data of the bridge under operational conditions using the advanced time-frequency method. The method is particularly suitable for addressing multicomponent monitored data and is expected to benefit future practical research in the bridge health monitoring field.Keywords: Time-frequency analysisreconstruction of accelerationinstantaneous frequency trackingresolution of representationroot mean squareoperational conditionssynchrosqueezed transform AcknowledgementsThe author expresses his gratitude to Dr. Ki Young Koo at the University of Exeter for providing the monitored data and contributing to the code.Disclosure statementThe author reports there are no competing interests to declare.","PeriodicalId":49468,"journal":{"name":"Structure and Infrastructure Engineering","volume":null,"pages":null},"PeriodicalIF":2.6000,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Structure and Infrastructure Engineering","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1080/15732479.2023.2275684","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CIVIL","Score":null,"Total":0}
引用次数: 0
Abstract
AbstractThis study aims to accurately and effectively investigate the instantaneous frequency (IF) of the monitored acceleration of the bridge, as well as the individual components of the monitored signal, using advanced time-frequency techniques. To achieve this, first, synthetic signals resembling the monitored acceleration are constructed and processed using four time-frequency techniques. The accuracy of IF tracking, signal reconstruction, and representation resolution are obtained and compared between these different time-frequency techniques. Subsequently, the monitored vertical and torsional accelerations from the Humber Bridge are analysed using the Fourier synchrosqueezed transform and the improved multisynchrosqueezing transform. This allows for the reconstruction of individual acceleration components along with the corresponding variation of the natural frequency. The magnitude of each component of the monitored acceleration is then obtained. The relative importance of modes in the monitored acceleration is evaluated based on the acceleration root mean square. This study presents a novel approach that involves reconstructing the monitored acceleration and assessing the magnitude of individual components of the monitored data of the bridge under operational conditions using the advanced time-frequency method. The method is particularly suitable for addressing multicomponent monitored data and is expected to benefit future practical research in the bridge health monitoring field.Keywords: Time-frequency analysisreconstruction of accelerationinstantaneous frequency trackingresolution of representationroot mean squareoperational conditionssynchrosqueezed transform AcknowledgementsThe author expresses his gratitude to Dr. Ki Young Koo at the University of Exeter for providing the monitored data and contributing to the code.Disclosure statementThe author reports there are no competing interests to declare.
摘要本研究旨在利用先进的时频技术,准确有效地研究桥梁加速度监测的瞬时频率(IF),以及监测信号的各个分量。为了实现这一目标,首先,利用四种时频技术构建和处理与监测加速度相似的合成信号。对不同时频技术的中频跟踪精度、信号重建精度和表示分辨率进行了比较。随后,利用傅里叶同步压缩变换和改进的多同步压缩变换对亨伯桥监测到的垂直加速度和扭转加速度进行了分析。这允许重建单个加速度分量以及相应的固有频率变化。然后得到被监测加速度的每个分量的大小。基于加速度均方根,评价了各模态在加速度监测中的相对重要性。本研究提出了一种新的方法,包括重建监测的加速度,并使用先进的时频法评估桥梁在运行条件下监测数据的各个分量的大小。该方法特别适用于处理多组分监测数据,有望为未来桥梁健康监测领域的实际研究带来益处。关键词:时频分析、加速度重建、瞬时频率跟踪、表示分辨率、均方根、运行条件、同步压缩变换感谢英国埃克塞特大学的Ki Young Koo博士提供的监测数据和编写的代码。披露声明作者报告无竞争利益需要申报。
期刊介绍:
Structure and Infrastructure Engineering - Maintenance, Management, Life-Cycle Design and Performance is an international Journal dedicated to recent advances in maintenance, management and life-cycle performance of a wide range of infrastructures, such as: buildings, bridges, dams, railways, underground constructions, offshore platforms, pipelines, naval vessels, ocean structures, nuclear power plants, airplanes and other types of structures including aerospace and automotive structures.
The Journal presents research and developments on the most advanced technologies for analyzing, predicting and optimizing infrastructure performance. The main gaps to be filled are those between researchers and practitioners in maintenance, management and life-cycle performance of infrastructure systems, and those between professionals working on different types of infrastructures. To this end, the journal will provide a forum for a broad blend of scientific, technical and practical papers. The journal is endorsed by the International Association for Life-Cycle Civil Engineering ( IALCCE) and the International Association for Bridge Maintenance and Safety ( IABMAS).