基于柔性电磁传感器的发动机叶片微缺陷检测  

Micro damage testing of engine blades based on flexible electromagnetic sensor

作　　者：陈棣湘[1] 潘孟春[1] 田武刚 周卫红 谢瑞芳 

机构地区：[1]国防科技大学智能科学学院,湖南长沙410073

出　　处：《中国测试》2018年第1期65-68,共4页China Measurement & Test

基　　金：国家重点研发计划项目(2016YFF0203400);国家自然科学基金项目(61171460;61171134)

摘　　要：飞机发动机叶片由于工作条件恶劣,容易出现疲劳和微缺陷,但采用传统的检测方法难以对其进行准确检测。该文提出一种基于柔性电磁传感器和数字锁定检测算法的微缺陷检测技术,在分析柔性阵列式电磁传感器特性的基础上,重点对传感器转移阻抗的数字锁定检测方法和数据处理方法进行研究,提出整周期数字锁定检测算法,可提高阻抗测量精度;搭建基于FPGA和ARM的检测平台,并通过实验验证检测效果。实验结果表明:阻抗幅度测量的重复精度达到0.04%,相位测量的重复精度达到0.02%,利用该方法可有效检测出0.1 mm宽度的微裂纹。Owing to the harsh service conditions, fatigues and micro damages are likely to occur in engine blades, which are difficult to be detected by the use of traditional methods. A micro damage detection method based on the flexible electromagnetic sensor and digital locked-in detection algorithm is proposed in this paper. After analysis on characteristics of flexible electromagnetic sensor array, the digital lock-in detection method of trans-impedance and the data processing method are emphatically investigated, and an integral period digital lock-in detection method is proposed, thus to improve the impedance measurement accuracy. A testing platform based FPGA and ARM is built and the testing effect is validated with experiments. According to the experimental results, the amplitude and phase measurement precision achieve 0.04% and 0.02% respectively, and the micro cracks of 0.1 mm wide can be detected effectively with this method.

关 键 词：柔性电磁传感器 发动机叶片 材料特性评估 转移阻抗 数字锁定检测 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]