發(fā)布時間：2018-11-15 10:53

【摘要】：利用第二代小波分解對信號突變信息敏感的特性,將結構動力響應信號分解為多個小波組分信號,通過各組分信號小波能量變化和小波能量變化率確定損傷位置和識別結構損傷,提出基于第二代小波能量變化率指標的結構損傷識別方法。研究結果表明:第二代小波能量變化率對結構損傷比較敏感,其幅值與置信上限之差遠高于其它測點,可以用來判定結構損傷位置;但噪聲對損傷識別的影響較大,在實用中應先對現(xiàn)場采取的動態(tài)信號進行降噪處理,再應用第二代小波能量變化率指標對結構進行損傷識別,可較好地識別出結構的損傷位置。
[Abstract]:Based on the sensitivity of the second generation wavelet decomposition to the signal mutation information, the structure dynamic response signal is decomposed into multiple wavelet component signals. According to the wavelet energy change and wavelet energy change rate of each component signal, the damage location is determined and the structure damage is identified. A structure damage identification method based on the second generation wavelet energy change rate index is proposed. The results show that the energy change rate of the second generation wavelet is sensitive to the damage of the structure, and the difference between the amplitude and the upper confidence limit is much higher than that of other measuring points, which can be used to determine the damage location of the structure. But the noise has a great influence on the damage identification. In practice, the dynamic signal should be de-noised first, then the second generation wavelet energy change rate index is used to identify the damage of the structure, which can better identify the damage location of the structure.
【作者單位】： 鄭州大學土木工程學院;河南交通職業(yè)技術學院公路學院;
【基金】：高等學校博士學科點專項科研基金資助項目(200804590006)
【分類號】：U446

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本文編號：2333103