摘要
结合HHT方法在描述信号瞬时特性和信号处理方面的独特优势,提出了一种基于HHT的泄流结构损伤实时监测诊断方法。首先,利用信号能量谱构造能量分布向量ηi,进而定义结构异常指标和预警指数,最后通过计算相邻时间段内的异常指标,实现结构损伤的在线监测。应用文中方法对一导墙结构进行数值仿真试验,结果表明,文章中定义的异常指标能够较准确地判断结构的损伤,同时具有一定的抗噪能力。
In the long-term service period, many factors may lead to serious damages and deficiencies to the structure, such as complicated working conditions, inadequate investigation and design, poor management, aging of structure, etc. Therefore, it＇ s very important to study the online monitoring method for flood discharge. According to the special advantages of HHT in instantaneous characteristics analysis and signal processing, an online monitoring method for flood discharge structure damage based on HHT is put forward in this paper. Firstly, after obtaining the HHT energy spectrum of measured responses, the energy distribution vector, defined as ηi, can be calculated. Then, because of the ηi differences between undamaged and damaged situations, we determine the structure anomaly indexes and the warning threshold. Finally, having been calculating the anomaly indexes of adjacent time periods, the damage online monitoring can be realized. The results from the numerical simulation test of a guide wall demonstrate that the anomaly indexes mentioned above can accurately identify the structure damage and have anti-noise ability to some degree. However, the further research for estimating the damage location and degree need to be developed in the next period
出处
《中国工程科学》
2011年第12期38-44,共7页
Strategic Study of CAE
基金
国家杰出青年基金(50725929)
国家自然科学基金创新研究群体科学基金(51021004)
教育部"长江学者和创新团队发展计划"创新团队(IRT0851)
水利部公益性行业科研专项项目(200901081)
西部交通建设科技项目(2009328000084)
国家科技支撑项目(2008BAB29B04)
关键词
泄流结构
HHT
能量分布向量
异常指标
预警指数
数值仿真
flood discharge structure
Hilbert-Huang Transform
the energy distribution vector
anomalyindex
warning threshold
numerical simulation
