基于小波包能量与模型修正的海洋平台结构损伤识别

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (6) : 212-223.

论文

庞军恒，董胜

作者信息 +

Structural damage identification of an offshore platform based on wavelet packet energy rate changing and model updating

PANG Junheng,DONG Sheng

Author information +

文章历史 +

摘要

对于常年服役的海洋平台，准确的损伤识别是保证其安全运行的重要保障。提出了一种对损伤敏感的小波包分解方案选取原则，以结构损伤前后加速度信号的小波包能量变化率作为残差，以结构的弹性模量作为待修正参数，通过灵敏度分析构建了一种新的目标函数用于模型修正和结构的损伤识别。将上述识别方法应用于简支梁模型，能够准确地识别出损伤的存在、位置和程度，验证了方法的可行性。对被噪声污染的信号进行识别分析，证明方法具有一定的鲁棒性。对噪声污染严重的信号进行小波阈值降噪处理，识别效果较降噪前有所改善。将方法应用于海洋导管架平台模型，对不同层高、不同杆件类型的损伤工况均能有效识别，说明方法对多层复杂结构同样适用。

Abstract

Accurate damage identification is an important guarantee for the safe operation of the offshore platform. Wavelet packet analysis can effectively reveal the partial feature of the signal, this paper proposes a sensitive to the damage of scheme selection principle of the wavelet packet decomposition, The wavelet packet energy change rate of acceleration signal before and after structural damage is taken as residual, the elastic modulus of the structure is taken as the parameter to be updated, a new objective function is constructed by sensitivity analysis for model updating and structural damage identification. Applying the above identification method to the simply supported beam model can accurately identify the existence, location and degree of damage, which verifies the feasibility of the method. The identification and analysis of the signal polluted by noise shows that the method has certain robustness, and the signal with serious noise pollution is denoised by wavelet threshold, the identification effect is improved compared with that before noise reduction. The method is applied to the offshore jacket platform model, and the damage scenario of different height and different type of member can be identified effectively, indicating that the method is also suitable for multi-storey complex structures.

导出引用

庞军恒，董胜. 基于小波包能量与模型修正的海洋平台结构损伤识别[J]. 振动与冲击, 2023, 42(6): 212-223

PANG Junheng,DONG Sheng. Structural damage identification of an offshore platform based on wavelet packet energy rate changing and model updating[J]. Journal of Vibration and Shock, 2023, 42(6): 212-223

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