摘要
为了保证使役环境下高速飞行器结构的安全性,以高速飞行器典型热防护结构为对象,对其实时变形重构方法进行研究.将分布式光纤光栅应变测量技术与基于改进Ko位移理论的重构算法相结合,实现了基于实测应变数据的结构全场位移重构和演示.以四点弯加载工况下的典型热防护结构位移场重构为例,开展了数值仿真研究,验证了算法的精度;并进一步开展了典型热防护结构的四点弯试验,结合MATLAB程序和LabVIEW数据采集系统,实现了变载荷工况下结构底部金属板位移场的实时重构演示,并利用局部测点的实测位移验证了重构位移场的精度.试验结果表明:在非固支工况下,改进Ko位移理论能够重构出典型热防护结构全场位移,验证了基于改进Ko位移理论的重构算法在非固支工况下结构变形实时重构研究中的有效性和准确性.
To ensure the safety of in-service high-speed vehicle,the real-time reconstruction technology of the full-field displacement of a typical thermal protection structure(TPS),which belongs to the high-speed vehicle was studied.By combining the distributed fiber Bragg grating(FBG)strain measurement technology with the reconstruction algorithm based on the improved Ko displacement theory,the real-time reconstruction and demonstration of the full-field structural displacement can be achieved based on the measured strain.The full-field structural displacement reconstruction problem of a typical TPS under four-point bending load was studied as an example,and numerical simulations were conducted to verify the accuracy of the algorithm.A four-point bending experiment on the typical TPS was further conducted,with the MATLAB code and LabVIEW for data acquisition,the displacement field of the metal plate at the bottom of TPS under varying loading case was reconstructed,the accuracy of the reconstructed displacement field was verified by the measured displacements at local points.Results show that the improved Ko displacement theory can perform the real-time reconstruction of full-field displacement for an unfixed TPS,which verifies the feasibility and accuracy of the proposed method.
作者
胡明月
吴邵庆
董萼良
Hu Mingyue;Wu Shaoqing;Dong Eliang(School of Civil Engineering,Southeast University,Nanjing 210096,China;Jiangsu Engineering Research Center of Aerospace Machinery,Southeast University,Nanjing 210096,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第4期664-671,共8页
Journal of Southeast University：Natural Science Edition
基金
江苏省优秀青年基金资助项目(BK20180062)
江苏省"六大人才高峰"高层次人才资助项目(B类)(KTHY-005)
上海航天科技创新基金资助项目(SAST2018-025).
关键词
热防护结构
实测结构应变
全场位移重构
Ko位移理论
四点弯试验
thermal protection structure(TPS)
measured structural strain
full-field displacement reconstruction
Ko displacement theory
four-point bending test
