基于应变传递率的管道结构损伤识别研究

为了研究海底管道损伤识别的分布式监测方法,在标量传递率概念的基础上提出了应变传递率概念和相应的损伤识别方法来对海底管道进行损伤识别,并通过有限元模型模拟对该方法进行了验证。对管道模型的不同损伤程度进行了分析,对比发现该方法相比加速度传递率和理论传递率对损伤程度更加灵敏。对不同边界条件进行分析,发现该方法对损伤位置的识别不受边界条件的影响。对参考单元的选取进行了验证分析,验证了参考单元应选择远离反弯点的非损伤位置。

Damage Detection for Pipeline Structures based on Strain Transmissibility

In order to study the distributive monitoring methods of damage detection in submarine pipelines ,this article proposed the concept of strain transmissibility and relevant methods of damage detection to recognize the damage in sub-marine pipelines bases on the concept of scalar transmissibility and Moreover ,the methods were verified by finite element model .Variant damage degrees are analyzed with pipeline models .Through comparison ,it is found that the methods are more sensitive than acceleration transmissibility and theory transmissibility ,and damage indexes are linear to damage de-grees .Analysis of boundary conditions finds that by using those methods the detection of damage sites is not affected by boundary conditions .The choice of reference modulus is analyzed and validated that reference modulus should be chosen from the undamaged positions away from the inflexion point .The methods can detect damage in submarine pipelines ,and thus lay the foundation of applying distributive sensors to monitoring the health of submarine pipelines .