中国机械工程Issue(17)：2384-2388,5.DOI:10.3969/j.issn.1004132X.2015.17.019
基于非线性超声调制的疲劳裂纹识别方法
Fatigue Crack Detection Using Nonlinear Ultrasonic Modulation Method
摘要
Abstract
Due to the influences of stress,impact and cyclic load,metal structure was likely to generate fatigue crack or other tiny damages.Conventional nonlinear modulation method could not de-tect fatigue crack when the boundary conditions were nonlinear.Herein,a nonlinear ultrasonic modu-lation method was developed to detect a fatigue crack on an aluminum beam,which recognized the modulation of tone burst and high-frequency ultrasonic wave.Intact beam and cracked beam were cho-sen as the subjects for the experiments,two PZTs were boned on the surface of the aluminum beams as the actuator and the sensor.The STFT was used for computing the spectrograms of the response which is acquired by the sensor.The modulations of tone burst and continuous sinusoidal excitation in-dicate the presence of fatigue crack.关键词
疲劳裂纹/结构健康监测/边界非线性/非线性超声调制/短时傅里叶变换Key words
fatigue crack/structural health monitoring/boundary nonlinearity/nonlinear ultra-sonic modulation/short-time Fourier transform(STFT)分类
通用工业技术引用本文复制引用
李拯,吴维亮,屈文忠,肖黎..基于非线性超声调制的疲劳裂纹识别方法[J].中国机械工程,2015,(17):2384-2388,5.基金项目
国家自然科学基金资助项目(51078293,51378402) （51078293,51378402）
