载人设备结构应力状态光纤光栅监测系统开发与应用

Development and Application of Fiber Bragg Grating Monitoring System for Stress State of Manned Equipment Structure

基于光纤光柵传感技术开发了一套载人设备结构应力状态监测系统,该系统由传感子系统、数据采集子系统、数据传输子系统、数据存储子系统和数据显示子系统等组成。系统通过光纤光柵传感器对载人设备结构的应变波长信号进行感知;利用数据采集系统对各测点的监测波长数据进行同步采集,通过数据传输子系统实现数据的实时远程传输。然后通过软件系统实现各通道采集应力数据同步存储,并实现数据的实时显示、历史曲线查询,利用后台数据分析显示该测点部位的疲劳损伤状态和裂纹萌生寿命的预测。最后通过现场测试,证明了现场采集数据的有效性,并结合载人设备结构应力热点区疲劳损伤诊断方法初步实现了对测点部位的损伤诊断和疲劳寿命预测。为载人设备结构的维修提供依据,保障载人设备的安全运行。

Based on fiber Bragg grating sensing technology, a stress monitoring system for manned equipment structure is developed. The system consists of sensor subsystem, data acquisition subsystem, data transmission subsystem, data storage subsystem and data display subsystem. The system senses the strain wavelength signal of the structure of the manned equipment through the fiber Bragg grating sensor, synchronously collects the monitoring wavelength data of each measuring point by the data acquisition system, and realizes the real-time and long-distance transmission of the data through the data transmission subsystem. Then, the stress data collected from each channel is stored synchronously by software system and the real-time display of the data and the query of the history curve is realized. The fatigue damage status and the prediction of the crack initiation life of the measuring point is displayed by the background data analysis. Finally, the validity of field data collection is proved by field test, and the fatigue damage diagnosis and fatigue life prediction are preliminarily realized in combination with the fatigue damage diagnosis method in the stress hotspot area of manned equipment structure. It provides a basis of the maintenance of manned equipment structure and ensures the safe operation of manned equipment.