空调冷凝器管道激光超声导波跨能量层级映射迁移检测方法  

Laser ultrasonic guided waves cross energy level mapping transfer detection method in air-conditioning condenser pipelines

作　　者：洪晓斌[1] 黄刘伟 Hong Xiaobin;Huang Liuwei(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广州510641

出　　处：《仪器仪表学报》2024年第1期230-238,共9页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(51975220,52375537)项目资助。

摘　　要：空调冷凝器是空调设备的关键部件,其弯管连接部位由于损伤类型多和几何形状复杂等原因造成传统接触式损伤检测手段难以应用,本文提出一种基于能量映射迁移网络的非接触式激光超声导波无损检测方法。首先,通过小波分解提取烧蚀信号和热弹信号的概貌波形,设计自编码能量映射函数将热弹信号特征空间映射到烧蚀信号特征空间,获得更接近烧蚀信号特征的映射热弹信号。其次,通过能量映射迁移网络对齐映射热弹信号和烧蚀信号特征空间,将网络模型中的域转换误差和样本标签误差之和用作特征空间对齐误差值。最后,对空调冷凝器泄漏、分层和裂纹等损伤进行检测实验验证所提新方法性能,结果表明其损伤识别精度为93.09%,比传统激光热弹激励检测方法提高了7.23%。The air-conditioning condenser is a key component of air-conditioning equipment.Its elbow connection makes it difficult to apply traditional contact damage detection methods due to various types of damage and complex geometric shapes.This article proposes a non-contact laser ultrasonic guided waves non-destructive testing method based on an energy mapping transfer network.Firstly,the approximate waveforms of the ablation signal and the thermoelastic signal are extracted through wavelet decomposition.An autoencoding energy mapping function is designed to map the thermoelastic signal feature space to the ablation signal feature space.The mapped thermoelastic signal close to the ablation signal is obtained.Then,the feature space of thermoelastic and ablation signals are aligned through the energy mapping transfer network.The network model uses the sum of domain conversion error and sample label error as the feature space alignment error value.Finally,the performance of the proposed method is evaluated through detection experiments on the air-conditioning condenser damage such as leakage,delamination,and cracks.The results show that the damage accuracy of the proposed method is 93.09%,which is 7.23%higher than the traditional laser thermoelastic excitation detection method.

关 键 词：空调冷凝器 管道损伤 激光超声导波 深度迁移学习 能量映射 

分 类 号：TH878[机械工程—仪器科学与技术]