基于光纤传感网络的可变体机翼应变场数值模拟及实验验证

Numerical Simulation and Experimental Study of Strain Field for Morphing Wings Based on Distributed Fiber Bragg Grating Sensor Network

在不同飞行姿态及飞行条件下,可变体机翼智能结构及驱动器根据外部条件及控制指令,可以实现翼体自适应动态变形,表现出良好的空气动力学性能。由于翼体结构应力场与温度场的分布和作用形式复杂多样,因此需要对结构进行多物理场耦合分析,并准确获取翼体结构应变分布的有效信息。为此,采用COMSOL Multiphysic多物理场数值分析软件,对可变体机翼后缘缩比模型进行了应力场与温度场的模拟仿真研究,并通过构建分布式光纤Bragg光栅传感网络实现对可变翼体结构关键部位应变分布信息的监测。仿真研究与实验测试结果均能够准确反映翼体结构在应力场与温度场耦合作用下翼体翼表结构的应变变化情况。

In different flight postures and flight conditions,the intelligent structure and actuator of a morphing wing may perform dynamic deformation as required by external conditions and control commands,which demonstrates its good aerodynamic property.Due to the complicated and varied conditions of distribution and function of the stress field and the temperature field of the wing body structue,it is necessary to perform a coupling analysis of multi-physical fields to obtain accurate information of the strain distribution of the wing body structure.This paper adopts the COMSOL Multiphysic numerical analysis software to study the stress field and temperature field of a downscaled morphing wing edge model.A distributed optical fiber Bragg grating sensor network is constructed to monitor the strain distribution of the key structural parts.Both simulation and experimental results can reflect accurately the strain variation of the wing body structure under the coupled action of the stress and temperature fields.