基于第二代小波变换的结构损伤识别研究 |
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基于第二代小波变换的结构损伤识别研究 Research on Identification of the Structural Damage Based on the Second Generation Wavelet Transform 发布时间：2011-07-21 浏览量：46 收藏数：0 评论数：0 总览 评价 陈淮1*， 万拥军1， 何伟2， 孙增寿1 （ 1、郑州大学土木工程学院； 2、华北水利水电学院土木与交通学院； ）
摘要： 提出使用第二代小波分解)的小波能量变化率指标进行结构损伤识别的方法。利用第二代小波分解的特性，将结构动力响应信号分解为多个小波组分信号，通过各组分信号小波能量变化和小波能量变化率识别结构损伤和确定损伤位置。数值仿真模拟表明：第二代小波能量分布对结构损伤比较敏感，在结构损伤位置，第二代小波能量变化率指标和置信上限之差远远高于其它测点，可以用第二代小波能量变化率指标判定结构损伤位置；噪声对使用第二代小波能量变化率指标进行结构损伤识别的影响较大，应先对现场采取的动态信号进行降噪处理，再应用第二代小波能量变化率指标对结构进行损伤识别，可较好地识别出结构的损伤位置；该方法步骤明确，便于计算机实施。
关键词： 损伤识别；第二代小波变换；能量变化率；噪音 CHEN Huai1*， WAN Yongjun1， HE Wei2， SUN Zengshou1 （ 1、School of Civil Engineering, Zhengzhou University； 2、School of Civil Engineering and Communication, North China Institute of Water Conservancy and Hydroelectric Power； ）
Abstract： In this paper a new method of the wavelet energy change rate for structural damage identification based on the second generation wavelet decomposition was proposed. Used decomposition characteristics of the second generation wavelet, the structural dynamic response signals was decomposed into multiple signals of wavelet components, and damage location was determined through the change and its rate of various components signal wavelet energies.Numerical simulation indicated that the second generation wavelet energy distribution was sensitive to the structure damage. The difference between the second generation wavelet energy changes rate indicators and upper confidence limits at structure damage location was much bigger than it at any other measuring points. Therefore, the second generation wavelet energy changes rate indicators could be used to locate structure damage. But the identification result was obviously affected by noise. So before identified damage by the second generation wavelet energy changes rate indicators method, the noise in dynamic signal taken on-site must be reduced. The method could locate the damage well which was clear and easily implemented by computer.
Keywords： damage identification; the second generation wavelet decomposition; energy changes rate; noise
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