【摘要】 针对机翼结构低速冲击载荷定位需求,提出了一种基于时差辨识的冲击载荷定位方法。首先采用Teager能量算子处理冲击响应信号,以提升响应信号时间分辨能力;在此基础上,给出了基于时差二分原理的冲击区域定位方法以及基于时差曲线拟合的冲击坐标计算方法。构建基于机翼模型的分布式光纤监测系统,分别实现针对冲击载荷的区域定位与精确坐标预测。试验结果表明:在长为120cm的大展弦比机翼模型上随机选取5个测试点进行低速冲击定位识别,实现了所有冲击测试点的区域辨识,正确率高达100%;坐标定位的平均误差为8.4cm。本文方法仅利用5个光纤布拉格光栅(FBG)传感器和低采样率FBG信号采集系统能够有效地实现冲击载荷位置辨识,具有监测网络简洁、辨识快速和实用性强等特点。更多还原

【Abstract】 Aiming at low speed impact load positioning,an impact localization algorithm based on timedifference identification is presented.Firstly,Teager energy operator is used to process the response signal for improving time resolution capability.Then,the impact area location method based on dichotomy of time-difference and impact coordinate calculation method based on time-difference curve fitting are suggested.Finally,by building an impact monitoring system of wing model based on distributed optical fiber,regional identification and accurate coordinates prediction of impact load are realized respectively.The results show that for 5 random impact points on the 120 cm-long high aspect ratio wings model,all areas of impact points can be identified correctly,and the average error of coordinates identification is 8.4 cm.The method can effectively realize the impact load location identification by using 5 fiber Bragg grating(FBG)sensors and a low sampling rate FBG signal acquisition system,and it has merits,such as simple monitoring network,fast identification capability and high parcticability.更多还原