基于分布式光纤传感的防热结构损伤识别研究

防隔热结构已大量应用在工程中,其健康状态对结构安全至关重要。为了监测隔热层粘接结构的健康状态,该文提出了一种基于分布式光纤传感器的防热粘接结构的损伤识别和监测方法。利用有限元法对带损伤试件承受弯曲载荷的过程进行了数值模拟,通过模拟的应变结果确定含有脱粘、裂纹两种损伤试件的应变趋势,作为判断结构失效的分类依据。通过对带有脱粘和裂纹缺陷的试件进行实验识别并定位损伤位置,监测试件的健康状况。研究结果表明,根据结构受载状态下的应变趋势可以判断试件是否发生脱粘或裂纹损伤,从而实现对结构的健康状态监测。

Research on Damage Detection of Heat insulating Structure Based on Distributed Optical Fiber Sensor

The anti thermal insulation structures are widely used in engineering, and their health status is very important to structural safety. In order to monitor the health status of thermal insulation bonded structure, a method for damage identification and monitoring of thermal adhesive structures based on distributed optical fiber sensors is proposed in this paper. First of all, the process of the damaged specimens under bending load is numerical simulated by the finite element method. The strain trend of the de bonding and cracked specimens is determined by the simulated strain results, which can be used as the classification foundation to determine the structure failure. The experiment on the specimens with de bonding and crack defects is carried out to identify and locate the damage location. The search results show that the de bonding and crack damage can be judged according to the strain trend of the structure under loading, so as to realize the structure health monitoring.