摘要
微磁裂纹信号幅值依赖于裂纹大小和裂纹深度,二者耦合对裂纹的识别计算带来较大的困难。首先运用超声回波的相位延迟技术进行裂纹的深度精确定位和形状初判,然后以此深度和形状信息对微磁信号有限元模型进行修正,解决微磁计算模型的盲搜索问题,实现裂纹的量化计算,进一步改进微磁三维成像技术,最后通过对某机翼裂纹进行成功的识别和定位,证明本方法的有效性。
The value of micro-magnetic signal in crack quantitative calculation model depends on crack size and crack depth excessively and the coupling information of size and depth brings most difficulties to crack quantitative calculation. This paper applies two methods to crack quantitative calculation based on ultrasonic information compensation. First it realizes precise position of crack depth and gives rough crack shape by phas.e delay technique of ultrasonic echo, and then modifies leakage magnetic infinite analysis model to resolve blind research of LMCQCM based on the information of crack depth and shape. Quantitative calculation of crack is acquired and leakage 3-D image technique is improved. The method is applied to a plane aerofoil crack recognition and position. The result shown its effectiveness.
出处
《噪声与振动控制》
CSCD
北大核心
2008年第2期82-84,共3页
Noise and Vibration Control
基金
国家自然科学基金资助项目(50175109)
关键词
声学
裂纹
微磁
有限元分析
acoustics
crack
ultrasonic
micro-magnetic
finite element analysis
