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从振动测试角度研究了识别海洋平台结构损伤的方法,利用损伤前后振动信号的小波包能量谱中特征频带能量谱幅值的差异来识别结构的损伤,为验证方法的有效性,利用海洋平台模型进行了振动测试试验,在模型的某一杆件处预制损伤,针对完好和损伤2种工况进行了振动测试,并应用小波包方法进行分析。试验结果表明,基于振动测试的海洋平台结构损伤识别是可行的。
From the point of view of vibration test, the method of identifying structural damage of offshore platform is studied. The structural damage is identified by the difference of the energy spectrum of the characteristic band in the energy spectrum of the wavelet packet before and after vibration. To verify the effectiveness of the method, Vibration test was carried out. The damage was preformed on one rod of the model. The vibration test was carried out for the two intact and damaged conditions and the wavelet packet method was used to analyze the vibration. The experimental results show that the structural damage detection of offshore platform based on vibration test is feasible.