中文摘要：

为了检测复杂复合材料结构的冲击内部损伤位置，构建了基于光纤传感网络的变截面复合材料板低速冲击监测系统。采用可检测结构应变场的光纤光栅传感器，在恒温下监测并分析了变截面复合材料板的冲击响应信号，利用经验模态分解方法提取冲击信号频谱特征，通过自回归模型将频谱特征量建模，最后利用样本信号与待测信号之间的马氏距离判定冲击信号位置。实验结果表明基于光纤光栅传感网络、经验模态分解和自回归模型的变截面复合材料板低速冲击定位方法可行且最大相对误差为4.27%。

英文摘要：

In order to localize the impact injuries inside complex composite structure,a low velocity impact monito-ring system for varied cross-section composite structure based on fiber Bragg grating（ FBG） sensor network was es-tablished. The paper used FBG sensors to measure the strain field of the structure,collected and analyzed impact re-sponse signals of varied cross-section composite laminated plate under constant temperature. The spectrum signatures of impact signals were extracted by empirical mode decomposition（ EMD） method and modeled by auto regressive modeling method. The Mallalanobis distance between template signals and signals to be measured was calculated to localize the impact position. The experimental results show that the proposed method is feasible for im-pact localization of varied cross-section composite structure and the maximum relative error is 4.27%.