基于振动传递率函数与统计假设检验的海洋平台结构损伤识别研究
发布时间：2018-12-13 03:27
【摘要】：由于受激励未知、测量噪声及建模误差等因素影响,基于振动的结构损伤识别结果存在明显不确定性。为此,利用振动传递率函数和统计假设检验进行结构损伤识别研究。用结构损伤前后加速度响应计算振动传递率函数;用主成分分析(Principal Component Analysis,PCA)提取结构损伤前后振动传递率函数的第一阶主成分作为正态总体样本;用多元统计分析中F检验法进行假设检验分析以达损伤识别目的。该方法无需激励信息,具有一定抗噪声能力,适合处理激励未知、测量噪声等因素引起的不确定性问题。通过海洋平台结构数值模拟及振动台模型试验验证该方法的可行性。
[Abstract]:Due to the influence of unknown excitation, measurement noise and modeling error, the results of structural damage identification based on vibration have obvious uncertainty. Therefore, structural damage identification is studied by using vibration transfer rate function and statistical hypothesis test. The vibration transfer rate function is calculated by the acceleration response before and after the damage, the first order principal component of the vibration transfer rate function before and after the damage is extracted by principal component analysis (Principal Component Analysis,PCA) as the normal population sample. In order to achieve the purpose of damage identification, the F test method is used to analyze the hypothesis in multivariate statistical analysis. This method does not need the excitation information and has the ability to resist noise. It is suitable for dealing with the uncertainty caused by unknown excitation and measurement noise. The feasibility of the method is verified by numerical simulation of offshore platform structure and shaking table model test.
【作者单位】： 青岛理工大学土工程学院;山东省蓝色经济区工程建设与安全协同创新中心;
【基金】：国家自然科学基金(51179082) 山东省蓝色经济区工程建设与安全协同创新中心
【分类号】：TU317
本文编号：2375786
[Abstract]:Due to the influence of unknown excitation, measurement noise and modeling error, the results of structural damage identification based on vibration have obvious uncertainty. Therefore, structural damage identification is studied by using vibration transfer rate function and statistical hypothesis test. The vibration transfer rate function is calculated by the acceleration response before and after the damage, the first order principal component of the vibration transfer rate function before and after the damage is extracted by principal component analysis (Principal Component Analysis,PCA) as the normal population sample. In order to achieve the purpose of damage identification, the F test method is used to analyze the hypothesis in multivariate statistical analysis. This method does not need the excitation information and has the ability to resist noise. It is suitable for dealing with the uncertainty caused by unknown excitation and measurement noise. The feasibility of the method is verified by numerical simulation of offshore platform structure and shaking table model test.
【作者单位】： 青岛理工大学土工程学院;山东省蓝色经济区工程建设与安全协同创新中心;
【基金】：国家自然科学基金(51179082) 山东省蓝色经济区工程建设与安全协同创新中心
【分类号】：TU317
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