飞机作动器连杆光纤光栅载荷校准方法

Load Calibration Method of Actuator Connecting Panels for Aircraft Based on Fiber Bragg Grating Sensors

结构状态评估技术可为飞机活动面载荷试飞提供监测手段,以验证载荷设计方法和分析数据是否有效,并可为活动面安全性确认和结构设计优化提供最直接的数据参考。传统的应变片测量方法在低温环境下的测试不稳定性可能会导致采集数据异常,使飞行载荷实时监测及精度保证成为型号试飞的一个难题。本文利用光纤传感器低温测试性能较稳定特性,结合理论分析、有限元仿真计算及试验验证,建立连杆结构在拉、压载荷工况下的应变-载荷关系模型,并提出一种基于光纤光栅传感器的作动器连杆应变-载荷校准方法。同时,针对作动器连杆结构典型承载形式与载荷辨识工况,给出光纤光栅传感器优化布局方法。研究结果表明,本文中建立的基于光纤光栅传感器的应变-载荷反演方法有效,能够满足民用飞机典型作动器连杆结构应变监测及载荷反演需求。

Structural health monitoring technology can provide methods for flight test load assessment of aircraft active surface to verify the effectiveness of load design method and analysis data,and to provide the most direct data reference for safety verification and optimization of the active surface structure.The instability of traditional strain gauges in low-temperature environments may cause abnormal data collection.It makes the real-time monitoring and assurance of accuracy of flight load a difficult problem.This paper proposes a method using fiber Bragg grating(FBG)sensors based on stable low-temperature performance,for flight load evaluation of the connecting panels by establishing the strain-load relationship model under the tensile and compression load conditions of the structure via theoretical analysis,finite element simulation and tests,and provides a FBG sensor optimized layout method for strain and load assessment requirements of typical connecting panels of aircraft.The results show that the strain-load inversion method based on FBG sensors is effective and can meet the strain and load monitoring requirements of typical actuator connecting panels.