FBG轴向非均匀应变分布的遗传规划重构方法  

Non-uniform strain profile reconstruction of FBG via genetic programming

作　　者：夏彦君[1] 郑世杰[1] 

机构地区：[1]南京航空航天大学智能材料与结构航空科技重点实验室,江苏南京210016

出　　处：《光电子．激光》2010年第8期1141-1145,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(10772077;50830201);航空科学基金资助项目(2007ZD52047)

摘　　要：针对现有的光纤Bragg光栅轴向非均匀重构方法需预先对应变分布形式做假设而实际结构中应变分布是任意的这一问题,基于新兴的遗传规划(GP)算法,提出一种重构FBG轴向非均匀应变分布的方法,利用GP自动设计并优化应变分布的函数表达式,使应变重构的空间分辨率可以达到任意值。多种应变分布形式下的应变重构仿真结果表明,GP方法可以有效地进行光栅轴向非均匀应变分布的连续重构,精度和计算效率较现有方法有明显提高。The traditional reconstruction algorithms for non-uniform strain distribution require that a suitable form of the strain distribution should be assumed a priori.But in practice the strain distribution is arbitrary,which can not be known a-priori.To overcome this problem,a method based on genetic programming（GP） algorithm is presented to regress the strain profile function of the FBG.This approach uses GP to generate random functions representing strain profile along FBG.GP returns the best function of strain profile function,which makes space resolution arbitrarily high,or even infinite.This article reconstructs several strain profiles,and the simulations demonstrate that GP can effectively reconstruct continuous profile expression along the whole FBG,and greatly improve its computational efficiency and accuracy.

关 键 词：结构健康监测 光纤Bragg光栅(FBG) 非均匀应变分布重构 遗传规划(GP)算法 MT矩阵法 

分 类 号：TN253[电子电信—物理电子学]