摘要
对提升框架的基本理论和基于提升框架的去噪方法进行了研究,分析了五种不同提升框架类型(5/3,2/6,2/10,5/11-C和13/7-T)对碳纤维复合材料的超声信号的去噪效果.结果表明对同一个信号,不同框架类型的去噪效果不同,其中框架13/7-T的平均去噪效果最好,具有最大的信噪比和最小的均方根误差,而同一种框架类型对不同信号的去噪效果则比较一致.比较了去噪前后超声信号的衰减系数与孔隙率之间的关系,结果表明经过提升框架去噪后超声信号的衰减系数与孔隙率之间更加符合抛物线关系,提高了碳纤维复合材料孔隙率检测的准确性.
Denoising analysis based on lifting scheme was conducted,and five different lifting schemes such as 5/3, 2/6, 2/10, 5/11-C, and 13/7-T were used to denoise the ultrasonic signals of carbon fiber reinforced plastics samples. The results show that the denoising results of different lifting schemes for the same signal are different, and the lifting scheme 13/7-T has the largest average signal noise ratio and the smallest average root mean square error. It is also shown that the denoising results of different signals for a same lifting scheme are similar. The relationship between ultrasonic attenuation and void content was compared for original signals and denoised signals, and the relationship for denoised signals turned out to be closer to parabola relationship.
出处
《传感技术学报》
CAS
CSCD
北大核心
2006年第6期2672-2675,2686,共5页
Chinese Journal of Sensors and Actuators
关键词
孔隙率
提升框架
碳纤维复合材料
超声衰减
void content
lifting schemes
carbon fiber reinforced plastics
attenuation
